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LM393D - Dual Differential Comparator, 36V, Open-Collector SOIC-8 | Texas Instruments (Tape & Reel)
LM393D

LM393D - Dual Differential Comparator, 36V, Open-Collector SOIC-8 | Texas Instruments (Tape & Reel)

The Texas Instruments LM393D is a dual differential comparator integrating two independent precision comparators on a single monolithic die, housed in an 8-pin SOIC surface-mount package with the industry-standard LM393 pinout. The device operates from a single supply of 2V to 36V or from split dual supplies of plus/minus 1V to plus/minus 18V, and features an open-collector output stage that supports rail-to-rail output swing through an external pull-up resistor. A comparator is an analog building block that compares two input voltages and drives its output to indicate which is greater. Within the component taxonomy, the LM393 belongs to the general-purpose voltage comparator family, sitting as a faster-switching cousin of the operational amplifier optimized for saturated logic-level output rather than linear amplification. It belongs to the signal-conditioning and power-management hierarchy, alongside op-amps, voltage references, and supervisors. Key features include a quiescent supply current of approximately 0.4 mA per comparator that is largely independent of supply voltage, a typical input offset voltage of 1 mV (improved to 0.37 mV on the LM393B revision), and a wide common-mode input range that includes ground (V-), enabling true single-supply ground-sensing. The open-collector output structure allows wired-OR logic and direct interfacing to TTL, CMOS, or any logic family by tying the pull-up to that family's supply rail up to 36V, independent of the comparator's own VCC. The LM393D is built on TI's mature junction-isolated bipolar process with a PNP input stage that gives it the low-input-bias-current robustness expected of a decades-old industry workhorse. Multiple second-source manufacturers including ROHM Semiconductor, STMicroelectronics, ON Semiconductor, and Diodes Incorporated produce pin-compatible LM393D variants, providing true multi-source resilience. The improved LM393B/2903B silicon offers drop-in compatibility with better DC precision and 1 microsecond response time. Typical applications include voltage-level detection, zero-crossing detectors, relaxation oscillators, window comparators, battery undervoltage/overvoltage monitors, and limit comparators in industrial, automotive, and consumer systems. It is also a staple in switched-mode power supply feedback, sensor threshold detection, and as a building block in PWM and 555-style timer circuits. Design consideration: every open-collector output requires a pull-up resistor (typically 1 kOhm to 100 kOhm). Add a few millivolts of positive-feedback hysteresis to prevent output chattering when the input signal transitions slowly through the threshold.

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LM393DE4 - Dual Open-Collector Comparator | Texas Instruments
LM393DE4

LM393DE4 - Dual Open-Collector Comparator | Texas Instruments

Texas Instruments LM393DE4 is a dual differential analog comparator with two independent comparison channels, a supply voltage range of 2 V to 36 V, and an open-collector output. The device is packaged in an 8-pin SOIC and is intended for commercial-grade applications. Each channel can operate from a single supply or dual supplies, while the low typical supply-current drain is 0.4 mA per comparator. A comparator is an analog semiconductor that evaluates two input voltages and produces a digital logic state indicating which input is higher. The LM393 belongs to the comparator hierarchy, where differential comparator forms part of interface ICs and broader signal-conditioning semiconductors. Unlike an op amp, the LM393 does not provide a push-pull output; each output uses an open collector, allowing the output node to be pulled up externally to a chosen logic voltage. This architecture is useful for wired-interface, threshold-detection, and open-collector signaling circuits. The two channels are designed to compare differential inputs against common-mode and output limits defined by the manufacturer datasheet. Key characteristics include a 300 ns response-time figure, a 2 V to 36 V supply range, and operation from either single or dual supplies. The open-collector outputs can sink external current through a pull-up resistor, but their rise time depends on the pull-up resistance, total node capacitance, and the next-stage input characteristics. The LM393DE4 is offered in the standard 8-SOIC package identified by the DigiKey listing as 8-SOIC, measuring 0.154 inches, or 3.90 mm, in body width. Commercial-grade temperature coverage is associated with the LM393 family. Because this is a general-purpose comparator rather than a precision rail-to-rail comparator, the input offset, input bias current, common-mode range, output timing, and output-current limits should be checked against the application before production release. Typical applications include detecting whether a sensor signal has crossed a threshold, monitoring battery or power-supply rails, translating industrial sensor states to logic levels, and supporting open-collector alarm or fault signaling. Two independent channels can monitor two related voltages, or both halves of the IC can serve unrelated functions when that improves layout efficiency and inventory consolidation. Design the output pull-up network carefully because the open collector does not actively source current. Place the pull-up resistor near the driven node, confirm that its voltage is within the next device's input limits, and evaluate its value against output rise time and power dissipation. Check the input common-mode range at the actual supply voltage, and allow sufficient spacing from the comparator switching threshold to prevent noise from causing repeated output transitions. This page combines the LM393DE4 electrical characteristics, pin assignment, drop-in alternatives, application guidance, and design checks to support component selection and PCB implementation. The comparison section highlights practical differences among electrically similar dual open-collector comparators, while the design notes focus on pull-up selection, supply-noise behavior, and robust threshold implementation.

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LM393DG - Dual Precision Comparator | onsemi | SOIC-8
LM393DG

LM393DG - Dual Precision Comparator | onsemi | SOIC-8

onsemi LM393DG is a dual independent precision voltage comparator with open-collector outputs, a 2 V to 36 V supply range, and 1.3 µs response time in an 8-pin SOIC package. The two comparator channels support single or split supply operation, while the common-mode input range extends to ground under single-supply conditions. A voltage comparator is an analog integrated circuit that compares two input voltages and changes its output state when the difference crosses a defined threshold. In the broader semiconductor hierarchy, a comparator belongs to the amplifier and signal-conditioning IC family, where it connects analog sensing functions to digital control, protection, and switching systems. The LM393DG combines two independent comparators in one package, reducing component count and simplifying dual-threshold or dual-channel designs. Key features include input offset voltage as low as 2.0 mV, single or split supply operation, and output compatibility with CMOS, DTL, ECL, MOS, and TTL logic families. Its open-collector outputs allow wired logic, level translation, or operation with an external pull-up resistor. A 1.3 µs response time supports applications where the comparator must resolve changing input conditions without the delay of a slower monitoring device. The LM393 series is designed for consumer, automotive, and industrial electronics, including threshold detection, sensor conditioning, window comparison, overvoltage indication, and relay or power-control interfaces. Each channel can operate from a single positive supply or from split supplies when the required input and output reference conditions permit it. Independent channels also allow different thresholds and switching functions within one package. Common-mode range to ground makes the device useful with low-voltage sensors whose signals remain near the lower supply rail. The output stage is open collector rather than push-pull, so every output requires a pull-up resistor unless it is intentionally wired together. Confirm the pull-up voltage, output sink-current requirements, input common-mode limits, and system grounding before finalizing a design. For robust layouts, keep input traces short, place bypass capacitance close to the supply pin, and isolate high-current switching nodes from comparator inputs. The SOIC-8 footprint simplifies through-hole assembly and PCB prototyping, while the open-collector outputs require careful pull-up placement to minimize switching noise and propagation delay. This page combines the LM393DG electrical characteristics, lifecycle status, drop-in replacement options, pinout, comparison data, and practical circuit guidance to support component selection and board-level implementation. It also identifies the operating parameters and sourcing facts that should be checked against the manufacturer datasheet before production release.

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LM393DG4 - Dual Open-Collector Comparator | Texas Instruments
LM393DG4

LM393DG4 - Dual Open-Collector Comparator | Texas Instruments

The Texas Instruments LM393DG4 is a dual differential comparator in an 8-pin SOIC package, designed for commercial-grade applications with open-collector outputs. It supports single-supply or dual-supply operation across a 2 V to 36 V supply range, with a listed maximum operating voltage of 30 V for the non-V device and 32 V for V-suffix devices. The device provides two independent comparator channels, low supply-current drain, and short-circuit-protected outputs. A comparator is an analog signal-processing IC that compares two input voltages and produces a logic-level indication of their relationship. The LM393 belongs to the comparator hierarchy: differential comparator, analog comparator, interface IC, and general-purpose semiconductor. It is commonly used in threshold detection, sensor conditioning, window comparisons, and simple control systems where an open-collector output can drive a pull-up network. Each LM393 channel has two differential inputs, a common supply ground, and an open-collector output. The open-collector architecture allows outputs to be pulled up to a chosen logic voltage and permits wired-AND behavior when multiple comparator outputs share a pull-up node. The low supply-current drain is listed as 0.4 mA typical per comparator, helping reduce system power in applications that do not require continuous high-current output drive. The LM393 is specified for propagation delay around 0.3 microseconds in distributor product information, making it suitable for general-purpose decision logic rather than high-speed timing applications. The device supports single supply or dual supplies, allowing a 5 V system to compare signals referenced to ground or an analog circuit to use split supplies. Input common-mode and output behavior should be checked against the manufacturer datasheet when operating near supply limits. Typical uses include battery-powered threshold monitors, industrial sensor interfaces, overvoltage and undervoltage detection, window comparators, and control inputs for motors or relays. Because the output is open collector, an external pull-up resistor is required to establish a valid high level. The pull-up value controls rise time, power consumption, and compatibility with the following logic family. For PCB design, place decoupling capacitors close to the supply pins and route comparator inputs away from switching nodes and high-current return paths. Keep the input network compact and use a solid ground reference, especially when the comparator detects small signal changes. Check input common-mode range, output sink current, supply limits, and thermal conditions in the manufacturer datasheet before finalizing the circuit. This page summarizes the LM393DG4 function, electrical envelope, applications, pinout status, and drop-in alternatives for engineers evaluating a robust open-collector dual comparator.

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LM393DMR2G - Dual Open-Collector Comparator | onsemi
LM393DMR2G

LM393DMR2G - Dual Open-Collector Comparator | onsemi

The onsemi LM393DMR2G is a dual, independent precision voltage comparator in an 8-MSOP package. Each channel supports single or split-supply operation, uses an open-collector output, and provides a rail-to-rail input common-mode range. The device operates across a 2 V to 36 V supply range and offers input offset voltage as low as 2.0 mV. A voltage comparator is an analog integrated circuit that compares two input voltages and changes its output state when one input exceeds the other. The LM393 belongs to the comparator hierarchy within analog interface and signal-conditioning ICs. Its two independent channels can compare sensor outputs, control thresholds, supervise analog signals, or translate small voltage differences into logic-level events. Open-collector outputs allow the two channels to share a pull-up resistor when wired-OR operation is useful. The principal features include two independent comparator channels, an open-collector output stage, rail-to-rail common-mode input capability, and operation from 2 V to 36 V. The low input offset voltage helps establish decision thresholds accurately when the compared signals differ only by a few millivolts. Its wide supply range also permits use in both low-voltage embedded systems and higher-voltage industrial control environments when the input and output levels are constrained appropriately. The LM393DMR2G is identified as an active part and is packaged in the compact 8-MSOP format. The suffix R2G identifies the onsemi ordering configuration. Its open-collector outputs require external pull-up resistors to establish a high output level. Because the output transistor can sink current but cannot actively source a high-level voltage, output rise time depends on the pull-up resistance and total output capacitance rather than on the comparator alone. Typical applications include battery threshold detection, industrial sensor interfaces, overvoltage and undervoltage protection, window comparators for two-sided limits, and logic-level translation using an external pull-up. In a two-threshold circuit, one channel can compare an input against an upper reference while the other compares it against a lower reference, allowing an external logic function to identify whether the signal is inside or outside the permitted range. Designers should choose pull-up resistor values carefully, account for the open-collector output's rise and fall behavior, and verify input common-mode limits at every supply voltage. Because the comparator is not a rail-to-rail output device, the pull-up supply defines the high output level and must match the receiving logic system. Decoupling capacitors should be placed close to the supply and ground pins to limit supply disturbance caused by output switching. This product page combines the exact LM393DMR2G electrical identity, package information, lifecycle and compliance attributes, verified sourcing URLs, pin assignments, application engineering guidance, and a strict assessment of drop-in replacement availability. The replacement assessment distinguishes electrically similar LM393 devices from substitutes that require a different physical footprint.

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LM393DR - Dual Differential Comparator, 36V, Open-Collector SOIC-8 | Texas Instruments
LM393DR

LM393DR - Dual Differential Comparator, 36V, Open-Collector SOIC-8 | Texas Instruments

The Texas Instruments LM393DR is a dual differential comparator integrating two independent precision comparators on a single monolithic die, housed in an 8-pin SOIC surface-mount package with the industry-standard LM393 pinout. The device operates from a single supply of 2V to 36V or from split dual supplies of plus/minus 1V to plus/minus 18V, and features an open-collector output stage that supports rail-to-rail output swing through an external pull-up resistor. A comparator is an analog building block that compares two input voltages and drives its output to indicate which is greater. Within the component taxonomy, the LM393 belongs to the general-purpose voltage comparator family, sitting as a faster-switching cousin of the operational amplifier optimized for saturated logic-level output rather than linear amplification. It belongs to the signal-conditioning and power-management hierarchy, alongside op-amps, voltage references, and supervisors. Key features include a quiescent supply current of approximately 0.4 mA per comparator that is largely independent of supply voltage, a typical input offset voltage of 1 mV (improved to 0.37 mV on the LM393B revision), and a wide common-mode input range that includes ground (V-), enabling true single-supply ground-sensing. The open-collector output structure allows wired-OR logic and direct interfacing to TTL, CMOS, or any logic family by tying the pull-up to that family's supply rail up to 36V, independent of the comparator's own VCC. The LM393DR is built on TI's mature junction-isolated bipolar process with a PNP input stage that gives it the low-input-bias-current robustness expected of a decades-old industry workhorse. Multiple second-source manufacturers including ROHM Semiconductor, STMicroelectronics, ON Semiconductor, and Diodes Incorporated produce pin-compatible LM393DR variants, providing true multi-source resilience. The improved LM393B/2903B silicon offers drop-in compatibility with better DC precision and 1 microsecond response time. Typical applications include voltage-level detection, zero-crossing detectors, relaxation oscillators, window comparators, battery undervoltage/overvoltage monitors, and limit comparators in industrial, automotive, and consumer systems. It is also a staple in switched-mode power supply feedback, sensor threshold detection, and as a building block in PWM and 555-style timer circuits. Design consideration: every open-collector output requires a pull-up resistor (typically 1 kOhm to 100 kOhm). Add a few millivolts of positive-feedback hysteresis to prevent output chattering when the input signal transitions slowly through the threshold.

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LM393DR2 - Dual Open-Collector Comparator, 8-SOIC | onsemi
LM393DR2

LM393DR2 - Dual Open-Collector Comparator, 8-SOIC | onsemi

The onsemi LM393DR2 is a dual independent precision voltage comparator with open-collector outputs, supplied in an 8-pin SOIC (D) package on tape and reel. It supports single or split supply operation, provides a common-mode input range that extends down to the negative rail (ground) under single-supply conditions, and delivers a typical response time of 1300 ns in the low-offset-voltage LM393 class. A comparator is a differential amplifier whose output is driven to one of two logic states depending on the sign of the differential voltage applied to its two inputs. In the power hierarchy, a comparator sits between a linear amplifier and a logic gate: like an amplifier it senses small voltage differences, but like a logic element it produces a hard, saturated output rather than a proportional one. Two comparators packaged in one 8-pin SOIC give the designer a window detector, an over/under-voltage supervisor, or a pair of independent threshold stages in a single footprint. Key features of the LM393DR2 include its low offset voltage, which minimizes the input differential that must be exceeded before the output flips state, and its open-collector output stage. The open collector means the output is a pulled-down transistor rather than a push-pull driver, so an external pull-up resistor to the supply rail is required. This arrangement allows the designer to set the logic-high reference to any voltage in the system, and it lets several comparators share one bus when only one is active at a time. Internally, the device contains two fully independent comparator channels with their own input and output pins, so the two halves can be used for unrelated functions, powered from split rails, or used in complementary configurations. Because the outputs are open collector, the device can also be used as a simple line driver, relay driver, or lamp driver by sinking the load current through the output transistor with a suitable pull-up network. Typical applications include DC over-voltage and under-voltage protection, battery low-state detection, window comparators for temperature or light sensing, zero-cross detection in motor and mains circuits, and general threshold logic in industrial control boards. One key design point: because the output is open collector, always fit a pull-up resistor. Choose its value so that the resistor dissipates acceptable power while keeping output rise time acceptable, and confirm that the input common-mode range covers the full signal swing of your source node. This page consolidates the manufacturer description, package details, cross-reference data and drop-in alternatives, plus practical design notes, comparison parameters and application guidance that are not gathered in one place on a single datasheet page.

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LM393DR2G - Dual Open-Collector Comparator | onsemi
LM393DR2G

LM393DR2G - Dual Open-Collector Comparator | onsemi

The onsemi LM393DR2G is a dual precision voltage comparator with two independent comparison channels, an open-collector output, and an 8-SOIC package. According to the manufacturer product page, the LM393 series supports single or split-supply operation, and its common-mode input range can extend to ground during single-supply use. The device is suitable for general-purpose signal conditioning, threshold detection, and industrial control applications. A voltage comparator is an analog integrated circuit that compares two input voltages and produces a logic-level output indicating which input is higher. A dual comparator contains two electrically independent comparator channels in one package, allowing simultaneous or separate threshold-monitoring functions. The open-collector output requires an external pull-up resistor, which provides flexible output voltage and rise-time control while allowing several open-collector outputs to share a bus. The LM393 series offers two independent precision comparators and input offset voltage specifications as low as 2.0 mV, according to the onsemi LM393 product page. Its common-mode behavior supports single-supply designs where the lower supply rail is ground. The open-collector outputs are compatible with conventional pull-up-based digital interfaces, while the 8-SOIC package supports standard surface-mount assembly and rework. Operation is specified from a single 2 V to 36 V supply, as identified in the LM393DR2G Mouser listing. The device is a bipolar comparator rather than a rail-to-rail CMOS comparator. Its supply arrangement permits either a single positive rail with a grounded reference or split supplies around ground. Because the output transistor is open collector, the output can pull low but cannot actively drive a high voltage without a pull-up network. Typical uses include sensor-threshold detection, overvoltage and undervoltage monitoring, window comparators, industrial control interfaces, and logic-level translation. Two channels can monitor independent signals, or they can be configured together for a hysteretic switch or window detector. A pull-up resistor sets the passive output-high voltage and can be selected to suit the receiving logic family. Designers should verify input and output limits, common-mode range, response time, and load-current requirements against the manufacturer datasheet before applying the comparator outside nominal conditions. Keep the input common-mode voltage within its rated range, account for input offset when setting precision thresholds, and place the external pull-up resistor close enough to the output to limit parasitic capacitance and rise time. This page combines manufacturer-family information, distributor listings, verified package details, cross-reference candidates, application guidance, and design notes. It also distinguishes genuine pin-compatible options from package-only lookalikes and highlights the electrical checks required before replacing an LM393DR2G in an existing design.

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LM393DR2GH - Dual Low-Offset Comparator | onsemi
LM393DR2GH

LM393DR2GH - Dual Low-Offset Comparator | onsemi

onsemi LM393DR2GH is a dual independent precision voltage comparator with open-collector outputs, operating from single or split supplies up to 36 V, and housed in an 8-pin SOIC package. The device provides two independent comparator channels and an input offset voltage specification as low as 2.0 mV. A voltage comparator is an analog integrated circuit that compares two input voltages and produces a digital logic result indicating which input is higher. The LM393 belongs to the comparator hierarchy within analog and mixed-signal semiconductors. Its open-collector outputs can sink current while operating in a wired-OR configuration, making it especially useful for simple sensing, threshold detection, and system-level protection circuits. The two channels operate independently, allowing one package to implement two unrelated threshold functions. The 36 V maximum total supply rating supports both conventional single-supply operation and split-supply arrangements. The common-mode input range extends to ground with single-supply operation, while the open-collector output stage provides flexible interfacing with pull-up resistors and external loads. The low input offset voltage improves the accuracy of comparisons near their reference thresholds. An offset voltage as low as 2.0 mV means the comparator can resolve relatively small differential inputs, which is beneficial in window detectors, sensor interfaces, and protection circuits operating close to a reference voltage. The open-collector architecture avoids push-pull output contention when multiple detector outputs are combined. Typical applications include battery-voltage monitoring, overvoltage and undervoltage protection, temperature-sensor threshold detection, industrial control interfaces, and logic-level translation. The two independent channels can also monitor separate signals when their grounding and supply conditions remain compatible. A pull-up resistor is required on each output because the open-collector transistor does not actively drive a high output voltage. Designers should account for input common-mode limits, output pull-up values, output sink current, and the maximum differential input voltage when defining the circuit. Place bypass capacitance close to the supply pins and keep sensitive input traces away from switching nodes. Because the output is open collector, its rising-edge speed depends on the pull-up resistor, load capacitance, and total wiring capacitance. This product page consolidates the principal electrical characteristics, package details, pin assignments, application guidance, and verified drop-in comparison options. It also highlights practical differences among standard, improved, low-voltage, and low-power LM393-family choices to support faster design selection and board-level sourcing decisions.

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LM393DRE4 - Dual Open-Collector Comparator | Texas Instruments
LM393DRE4

LM393DRE4 - Dual Open-Collector Comparator | Texas Instruments

The Texas Instruments LM393DRE4 is a dual differential comparator with two independent comparator channels, an open-collector output, and an 8-pin SOIC package. The device operates from a single 2 V to 36 V supply, has a 300 ns response time, and is specified for applications up to 70°C. Its rail-to-rail input behavior and TTL-compatible outputs make it suitable for threshold detection, interface conversion, and open-collector bus designs. A comparator is an analog integrated circuit that compares two input voltages and changes its output state according to their relationship. The LM393 belongs to the hierarchy of dual comparator, voltage comparator, analog IC, and semiconductor. Unlike an operational amplifier with continuous linear output, a comparator is optimized for fast switching between two output states. Two independent channels allow one package to perform two threshold or protection functions. Key characteristics include two open-collector outputs, 300 ns propagation delay, operation from 2 V to 36 V, and a supply-current drain of 0.4 mA typical per comparator. The open-collector architecture requires an external pull-up resistor because the output transistor actively pulls the output low but does not source current. TTL compatibility supports connection to older digital logic, while the broad supply range accommodates both low-voltage control systems and higher-voltage industrial rails. Each channel contains an inverting input, a non-inverting input, and an output. When the non-inverting input is higher than the inverting input, the corresponding open-collector transistor turns on and pulls the output toward ground. Reversing the input relationship turns the transistor off and allows the pull-up resistor to raise the output. This behavior can be used for window detection, signal conditioning, current monitoring, and fault isolation without requiring a dedicated push-pull output driver. Typical uses include industrial sensor interfaces, battery monitoring, overvoltage and undervoltage detection, TTL-to-open-collector conversion, and embedded control logic. The SOIC-8 package simplifies assembly on conventional surface-mount boards, while the separate comparator channels allow one side of the circuit to monitor a power rail while the other handles a control threshold. External pull-up resistors must be selected according to the required sink current, logic voltage, rise time, and bus capacitance. The principal design consideration is that an open-collector output does not define a valid high voltage by itself. Place the pull-up resistor close to the relevant logic input, confirm that the sink current remains within the output rating, and account for bus rise time when capacitance is significant. The LM393DRE4 is best suited to commercial-temperature designs that require a low-cost, wide-supply dual comparator without rail-to-rail push-pull outputs. This page combines the device's core electrical characteristics, package details, application guidance, drop-in alternatives, and design trade-offs in a format that helps engineers evaluate the LM393DRE4 before integrating it into a comparator or protected-interface circuit.

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LM393DRG3 - Dual Open-Collector Comparator | Texas Instruments
LM393DRG3

LM393DRG3 - Dual Open-Collector Comparator | Texas Instruments

The Texas Instruments LM393DRG3 is a dual differential comparator with an open-collector output, operating from 2 V to 36 V and packaged in an 8-pin SOIC. The device contains two independent comparators, supports single or dual supplies, and produces outputs compatible with CMOS, MOS, and TTL logic. According to the Texas Instruments LM393 product page, it is designed for commercial-grade applications. A differential comparator is an analog integrated circuit that compares two input voltages and changes its output state according to their relationship. The LM393 belongs to the comparator hierarchy within analog and linear ICs, where its purpose is to convert a small voltage difference into a logic-level indication. Each half of the device can compare a sensed voltage against a reference or against another signal, making the part useful for threshold detection, supervision, and signal conditioning. The LM393 provides a 2 V to 36 V supply range and can operate with single supplies from 2 V to 36 V or dual supplies from ±1 V to ±18 V. Its differential input voltage range can equal the maximum-rated supply voltage, while its common-mode input range includes ground. The open-collector outputs permit wired logic, external pull-up resistors, and level translation, but require suitable pull-up components when the outputs drive CMOS or TTL loads. The two comparators are independent, allowing one channel to monitor a supply threshold while the other performs a second sensing or switching function. Low input bias current, low input offset voltage, and rail-to-rail input characteristics support accurate comparisons over a wide operating range. These characteristics make the device useful when the input signal is close to ground or when the reference voltage must be monitored with minimal loading of the source. Typical LM393DRG3 applications include window comparators for battery and power-supply supervision, zero-cross detection in control systems, sensor threshold conditioning, relay-driver interfaces, and general industrial logic interfaces. The open-collector architecture is especially useful when a system needs a wired-AND output or a voltage level different from the comparator supply voltage. An external pull-up resistor sets the resulting high level. Designers should verify input common-mode limits, output pull-up values, and output-current requirements before finalizing the circuit. The open collector sinks current but does not actively source a high-level voltage, so each output requires an appropriate pull-up network unless another compatible open-collector device supplies it. Keep pull-up routing short and account for rise time when driving longer traces or high-capacitance nodes. This page combines the LM393DRG3 operating limits, package details, verified drop-in alternatives, comparison parameters, and application guidance to support component selection and board-level implementation. The LM393DRG3 is particularly suitable when a dual, general-purpose comparator with open-collector outputs and wide supply-voltage operation is required in an 8-pin SOIC footprint.

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LM393DRG4 - Dual Open-Collector Comparator | Texas Instruments
LM393DRG4

LM393DRG4 - Dual Open-Collector Comparator | Texas Instruments

Texas Instruments LM393DRG4 is a dual differential comparator designed for commercial-grade applications, with two independent comparator channels in an 8-pin SOIC package. It uses open-collector outputs, supports rail-to-rail input operation, and operates from a single power supply over a wide voltage range. The open-collector architecture requires an external pull-up resistor and permits the output to be pulled to a level compatible with TTL, MOS, or CMOS logic. A comparator is a semiconductor integrated circuit that compares two input voltages and produces a digital-level indication of their relationship. Within the power-management hierarchy, a comparator belongs to the analog signal-conditioning and interface class, where it bridges low-level analog signals and digital control logic. The LM393 combines two independent channels in one package, making it useful where two thresholds, sensor outputs, or protection events must be evaluated. Key features include dual differential comparison, a differential input range equal to the maximum rated supply voltage of plus or minus 38 V, rail-to-rail input behavior, and open-collector outputs compatible with TTL, MOS, and CMOS systems. The differential range means each channel can accept a wide voltage difference between its inverting and non-inverting inputs. The open-collector output can sink current from the output stage while the external pull-up establishes the logic-high voltage, allowing the interface voltage to be selected independently from the comparator supply. The LM393B and LM2903B families are identified by Texas Instruments as drop-in replacements for LM293, LM393, and LM2903 devices in A and V grades. This makes the LM393DRG4 useful as a familiar general-purpose comparator where a new design does not require a rail-to-rail output stage or a push-pull output architecture. The two channels are independent, allowing one package to monitor two separate analog conditions. Typical uses include overvoltage and undervoltage detection, battery monitoring, sensor thresholding, industrial control interfaces, and general digital logic conditioning. The open-collector output also supports wired-AND behavior when multiple comparator outputs share a pull-up. Open-collector comparators are particularly useful when several devices must signal one shared node or when the logic-high voltage must differ from the comparator supply. Designers should account for the required pull-up resistor, input common-mode limits, output sink-current limits, and propagation-delay behavior when choosing system timing. Keep sensitive input traces short, maintain adequate supply bypassing, and account for the influence of output pull-up resistance on switching speed and rise time. Use the manufacturer datasheet pin-description and electrical-characteristics tables before assigning PCB functions or interpreting logic thresholds. This page combines the manufacturer product information, distributor identification, package details, and engineering guidance to support product selection. It also organizes drop-in alternatives, application guidance, comparison parameters, and design cautions so engineers can evaluate the LM393DRG4 without confusing package compatibility with full electrical equivalence.

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LM393DT - Dual Low-Power Voltage Comparator | STMicroelectronics
LM393DT

LM393DT - Dual Low-Power Voltage Comparator | STMicroelectronics

The LM393DT is a dual low-power voltage comparator from STMicroelectronics, designed for general-purpose applications requiring precise voltage comparison with minimal power consumption. It operates from a single supply voltage ranging from 2V to 36V or dual supplies from ±1V to ±18V, with a typical supply current of only 0.4 mA per comparator. The device features an open-collector output stage that can sink up to 16 mA, allowing direct interface with TTL, CMOS, and other logic families. The LM393DT is available in the SOIC-8 package, making it suitable for space-constrained PCB designs. Data verified as of 2026-08-05. A voltage comparator is an electronic circuit that compares two input voltages and outputs a digital signal indicating which is higher. The LM393DT is a dual comparator, meaning it contains two independent comparators in a single package. Comparators are fundamental building blocks in analog and mixed-signal systems, used in applications such as threshold detection, zero-crossing detection, and waveform shaping. They are part of the broader category of linear ICs, which also includes operational amplifiers and voltage regulators. The LM393DT's low power consumption and wide supply range make it a versatile choice for battery-powered and industrial applications. Key features of the LM393DT include a low input offset voltage of 2 mV (typical), a low input bias current of 25 nA (typical), and a response time of 1.3 µs (typical) for a 5V overdrive. The open-collector output allows wired-OR connections and level shifting, and the device can operate from a single supply as low as 2V, making it suitable for low-voltage systems. The SOIC-8 package provides a compact footprint with a thermal resistance of 150 °C/W, enabling reliable operation in moderate temperature environments. The LM393DT uses a bipolar transistor architecture with a differential input stage and an open-collector output. This design provides high input impedance and stable operation over a wide temperature range (-40°C to +105°C). The device includes internal ESD protection and is designed to meet JEDEC standards for reliability. The open-collector output requires an external pull-up resistor, which allows the output voltage to be set to any level up to the maximum supply voltage, providing flexibility in interfacing with different logic families. Typical applications for the LM393DT include window comparators, level shifters, oscillator circuits, and analog-to-digital converters. In a window comparator, the dual comparators are used to detect whether an input signal is within a specified voltage range, which is useful in battery monitoring and overvoltage protection. The low power consumption makes it ideal for portable devices, while the wide supply range supports industrial control systems operating from 24V rails. When designing with the LM393DT, ensure that the pull-up resistor is selected to limit the output sink current to within the 16 mA maximum rating. For high-speed applications, minimize parasitic capacitance on the output node to achieve the specified response time. The input common-mode range extends from ground to VCC-1.5V, so ensure that input signals remain within this range for proper operation. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the STMicroelectronics datasheet, providing a comprehensive resource for engineers selecting and using the LM393DT.

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LM393EDR2G - Dual Open-Collector Comparator | onsemi
LM393EDR2G

LM393EDR2G - Dual Open-Collector Comparator | onsemi

The onsemi LM393EDR2G is a dual, independent, low-offset-voltage comparator that operates from a single supply or split supply in an 8-pin SOIC package. Each comparator provides an open-collector output, a supply-voltage rating of up to 36 V, and input offset voltage specifications as low as 2.0 mV. The device is intended for general-purpose analog signal conditioning, threshold detection, and industrial control applications. A comparator is an analog interface integrated circuit that evaluates two input voltages and produces a logic-level indication of their relationship. The LM393 series belongs to the comparator hierarchy within analog and mixed-signal semiconductors. Its two independent channels can compare separate sensor, reference, or feedback signals, making it useful wherever a control system requires a decision based on analog voltage levels rather than numerical data processing. The LM393EDR2G provides two independent precision voltage comparators in one package. Its open-collector outputs can sink current and require an external pull-up resistor when operating at positive logic levels. The single-supply configuration allows the common-mode input range to extend toward ground, while split-supply operation supports bipolar signal comparison. The 2.0 mV low-offset specification improves threshold accuracy in applications where the difference between two nearby voltages determines the output state. The 8-SOIC package supports conventional surface-mount assembly and preserves a straightforward pinout for designs using the standard LM393 family. Because the outputs are open collector rather than totem-pole, designers must account for pull-up placement, sink-current limits, rise-time behavior, and possible interaction between channels. Two open-collector outputs can also be wired together when wired-OR logic is required, provided the resulting current and timing constraints are acceptable. Typical applications include industrial sensor interfaces, battery and power-system threshold monitoring, window-comparator signal conditioning, overvoltage and undervoltage detection, and control inputs for automotive or consumer equipment. In each case, the two channels provide independent comparisons while operating from a common device supply. The broad supply range also makes the device suitable for systems whose input rails vary significantly. The primary design consideration is output pull-up configuration. Place the pull-up resistor close to the open-collector output to limit trace capacitance and improve switching speed. Also verify the input common-mode range and differential input limits at the actual minimum and maximum supply voltages, and confirm that the pull-up current remains within the output sink-current rating. This product page combines the manufacturer's functional description, package and cross-reference information, practical design guidance, and application-specific selection criteria. It is intended to help engineers determine whether the LM393EDR2G fits an existing dual-comparator footprint and how to evaluate its electrical and environmental constraints before layout release.

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LM393F-E2 - Dual Ground-Sense Comparator | ROHM
LM393F-E2

LM393F-E2 - Dual Ground-Sense Comparator | ROHM

The ROHM Semiconductor LM393F-E2 is a dual ground-sense comparator with two independent comparison channels, an operating supply range of 3 V to 32 V, and open-collector outputs in an 8-pin SOP package. Each channel provides an inverting input, a non-inverting input, and an output, allowing two independent threshold decisions within one package. A comparator is a semiconductor that evaluates two input voltages and changes its output state according to their relationship. The dual ground-sense comparator belongs to the comparator IC, analog signal-conditioning, and power-management IC hierarchy. Its open-collector architecture requires an external pull-up resistor, making it useful for wired logic levels, system fault signaling, and interfaces where active-low signaling is preferred. The LM393F-E2 supports a wide 3 V to 32 V operating supply range and features low supply current. These characteristics suit industrial control, instrumentation, power-supply supervision, and general-purpose signal conditioning. Because the outputs are open collector, multiple comparators can share a pull-up node when the design requires wired logic behavior, provided timing, sink-current, and fault-state requirements are checked. The two channels are intended for general-purpose comparison rather than rail-to-rail precision operation. Input common-mode limits, offset voltage, propagation delay, output-current capability, and electrical characteristics vary with supply voltage and temperature. These operating dependencies should be considered when selecting comparator gain, resistor values, and switching thresholds. The SOP outline also requires attention to copper area, thermal dissipation, and clean routing of the high-impedance comparison inputs. Typical uses include monitoring a divided battery voltage, detecting overvoltage or undervoltage conditions, checking a sensor signal against a reference, and generating an active-low fault indication. The same topology also works for industrial control thresholds and simple automotive or appliance protection circuits when the operating temperature and qualification requirements are suitable. Use the pin-description table in the ROHM manufacturer datasheet when assigning PCB tracks and pull-up components. Pay particular attention to the common supply pins and output pull-up topology; incorrect output-state assumptions or unsuitable pull-up values can create excessive sink current, slow transitions, or an unintended system fault indication. This page combines package-specific pin information, comparison data, drop-in replacement analysis, application guidance, and practical design notes for engineers evaluating the LM393F-E2 in analog threshold-detection and power-management systems.

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LM393F-GE2 - Dual Open-Collector Comparator | ROHM
LM393F-GE2

LM393F-GE2 - Dual Open-Collector Comparator | ROHM

The ROHM Semiconductor LM393F-GE2 is a dual general-purpose comparator with two independent channels, a 3 V to 32 V supply range, and an open-collector output in an 8-pin SOP package. Each channel compares two input voltages and provides a logic-level indication of their relationship. The comparator is specified for input bias current up to 0.25 µA, input offset voltage up to 4.5 mV, propagation delay of 1 µs, and an operating temperature range from -40 °C to +85 °C. A comparator is an analog signal-processing IC that converts the relationship between two voltages into a digital result. The LM393 belongs to the comparator hierarchy within amplifier and linear ICs, where its role is to determine whether a signal is above or below a reference. Unlike a general-purpose operational amplifier used for closed-loop amplification, a comparator is normally operated open-loop and switches its output when the differential input crosses a defined threshold. The LM393F-GE2 combines two independent comparators in one 8-pin SOP package. Its open-collector outputs can sink output current while the device is in the low state and require an external pull-up resistor when used with a positive logic supply. The 3 V to 32 V operating range accommodates both conventional 5 V logic and higher-voltage industrial systems. The 4.5 mV maximum input offset voltage and 0.25 µA maximum input bias current help reduce threshold errors and loading in sensor and monitoring circuits. The two-channel architecture allows independent thresholds or complementary decisions to be implemented in one package. A 1 µs propagation delay is suitable for common industrial control, sensing, and protection tasks where response time is adequate but nanosecond-level performance is unnecessary. Because the outputs are open collector, each channel can also participate in wired logic when the voltage, current, and pull-up requirements are appropriate. Typical applications include overvoltage and undervoltage monitoring, sensor threshold detection, industrial control interfaces, DC motor-direction sensing, and window or limit comparators. The comparator can evaluate a feedback voltage against a reference generated by a resistor divider or reference IC. Its low input bias current is especially useful when the sensing source has high impedance, while the open-collector output simplifies interface to transistors, relays, and digital logic. Designers should select the pull-up resistor and output pull-down load with the allowable output current, supply voltage, and switching-speed requirements in mind. Input common-mode range and output saturation behavior must also be checked for the selected logic level. Because the ROHM status is Not Recommended for New Designs, new designs should evaluate an actively supported comparator unless this part is required for continuity with an existing qualified design. This product record combines the exact LM393F-GE2 specifications, package information, lifecycle status, sourcing workflow, and drop-in comparison guidance. The comparison and design notes also clarify where pin-compatible parts differ in supply range, common-mode capability, or electrical performance, helping engineers make an informed continuity decision.

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LM393FVJ-E2 - Dual Open-Collector Comparator | ROHM
LM393FVJ-E2

LM393FVJ-E2 - Dual Open-Collector Comparator | ROHM

The ROHM Semiconductor LM393FVJ-E2 is a dual, general-purpose differential comparator with an open-collector output, a 3.0 V to 36.0 V operating supply range, and an operating temperature range of -40°C to 125°C. The device is packaged in an 8-pin TSSOP-B8J package and is supplied in tape-and-reel packing. Each comparator channel compares two input voltages and provides an open-collector output that can sink current while operating in a wired-AND configuration. A comparator is a semiconductor interface that converts the relationship between two voltages into a logic-level indication. The LM393 belongs to the broader open-collector comparator family, providing a straightforward alternative to logic gates when an analog threshold must be evaluated. Its two independent channels make it useful for monitoring two conditions, while its open-collector outputs allow multiple comparators to share a pull-up resistor and participate in wired-AND or wired-OR arrangements. The principal features of the LM393FVJ-E2 include wide operating supply voltage, ground-sensed input and output, open-collector outputs, low offset voltage, and a broad operating temperature range. According to the ROHM product documentation, the 3.0 V to 36.0 V supply capability permits operation from low-voltage systems through higher industrial rails. The open-collector architecture also gives the designer control over the output pull-up voltage, which is useful when interfacing the comparator with a supply different from its own. Each internal channel consists of a differential input stage followed by an open-collector output stage. The inverting and non-inverting inputs determine the output state according to the applied voltage relationship. Because the output transistor is open collector, an external pull-up resistor is required. The output can remain in a high-impedance state while the transistor is off, and the pull-up establishes the high output voltage without requiring an active push-pull output stage. Typical applications include general-purpose threshold detection, current monitoring, battery monitoring, window comparators, relay-control interfaces, and multivibrator circuits. In a battery monitor, the two input channels can independently evaluate charge and discharge thresholds. In an industrial control system, the open-collector output can interface with a suitably rated relay driver or other pull-up-equipped peripheral. Designers should select an external pull-up resistor that satisfies the required sink current, output rise time, and downstream-device input limits. The pull-up should connect only to a compatible positive supply, and the circuit must account for the open-collector output remaining off during reset or fault conditions. Confirming the input common-mode range and output-current limits at the intended supply voltage is essential for reliable operation. This page organizes the ROHM product details, verified distributor records, lifecycle status, application guidance, and replacement assessment into one engineering-focused reference. It also identifies which technical attributes require confirmation from the manufacturer datasheet before a board is released to production.

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LM393M - Dual Open-Collector Comparator | Texas Instruments
LM393M

LM393M - Dual Open-Collector Comparator | Texas Instruments

The Texas Instruments LM393M is a dual differential comparator in an 8-pin SOIC package, with two independent comparator channels and open-collector outputs. The verified distributor listing identifies it as a standard general-purpose comparator supporting single-supply or dual-supply operation, with a 2 V to 36 V total supply range and comparator response time listed as 1.4 microseconds. Its open-collector outputs require an external pull-up resistor, allowing the output stage to be wired for wired-AND behavior, level translation, or interface to a higher-voltage logic system. What is a dual differential comparator? A comparator is an analog integrated circuit that compares two input voltages and produces a binary high-or-low result according to their relationship. A differential comparator includes both a non-inverting and an inverting input. The LM393M contains two such channels, making it useful for independent threshold decisions in one package. It belongs to the comparator, analog IC, and semiconductor hierarchy rather than being an amplifier; the output intentionally indicates which input is higher instead of reproducing an analog signal. The key verified feature set includes two differential comparators, an 8-SOIC surface-mount package, open-collector outputs, a 1.4 microsecond response time, and a 2 V to 36 V comparator supply specification. The distributor comparison material also lists differential input and output-current information, while the supplied search results identify the device as suitable for general-purpose comparison. Because the output transistor is open collector, output high level depends on the pull-up resistor and supply rail, not on a push-pull output driver. The two channels are independent, allowing the device to compare two separate sensor or control signals. The common open-collector output architecture can be useful in power-monitoring circuits where several comparator outputs must combine logically, provided the system uses suitable pull-up resistors and does not exceed the device's electrical limits. The SOIC-8 package supports conventional surface-mount assembly, while the dual channel count can reduce board area compared with two single comparators. Typical applications include battery and power-supply monitoring, overvoltage and undervoltage protection, sensor threshold detection, industrial control logic, window or level monitoring, and general digital control systems. The 2 V to 36 V comparator supply range provides useful flexibility for industrial and embedded systems, although the complete operating conditions must be checked against the manufacturer datasheet. A key design consideration is the open-collector output. Add a pull-up resistor to each output, choose its value with the required sink-current and rise-time limits in mind, and ensure that the downstream device accepts the resulting logic level. Do not assume that the output can source current independently. The input common-mode range, output saturation levels, supply current, and absolute maximum ratings are not fully specified in the supplied verified data and must be confirmed before design release. This page combines the verified distributor identity, package information, comparator function, search-result specifications, available cross-reference sources, and practical design guidance. It does not invent unprovided offset, temperature, response-current, or compliance details; unavailable parameters are identified for engineering follow-up.

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LM393MX - Dual Open-Collector Comparator, 2-36V | Texas Instruments
LM393MX

LM393MX - Dual Open-Collector Comparator, 2-36V | Texas Instruments

Texas Instruments LM393MX is a dual general-purpose differential comparator with open-collector outputs, a 2 V to 36 V supply-voltage range, and an 8-pin SOIC package. The two comparators can operate independently, making the device suitable for voltage-level detection, threshold comparison, window monitoring, and interface conditioning. Verified distributor information identifies the LM393MX as a standard rail-to-rail comparator with a typical response time of 1.3 µs. A comparator is an analog integrated circuit that compares an input voltage with a reference voltage and changes its output state when the relationship between those voltages reverses. The LM393 belongs to the comparator hierarchy within analog and power-management semiconductors. Its open-collector output architecture differs from push-pull or CMOS outputs because the output transistor requires an external pull-up resistor to establish a high voltage. The principal benefits of the LM393MX are its wide 2 V to 36 V operating range, low 1 mA supply current, two independent comparison channels, and open-collector outputs that can support wired logic or interface signaling. The verified data identifies the package as 8-SOIC, making it practical for conventional surface-mount PCB assembly. Its commercial operating-temperature range is listed as 0°C to +70°C. Each channel compares a non-inverting input with an inverting input. When the non-inverting input is higher, the associated open-collector output transistor turns on and pulls the output toward ground. When the non-inverting input is lower, the transistor turns off and the external pull-up resistor raises the output. This behavior allows the output voltage to be established by the system supply and interface rather than by the comparator alone. Typical uses include battery-voltage supervision, industrial sensor thresholds, overvoltage and undervoltage detection, signal conditioning, and control-system interlocks. Its two channels can implement two independent decisions, such as monitoring two regulated rails in one controller. Because the output is open collector, applications must include a suitable pull-up resistor and must account for the sink-current capability of the output transistor. A primary design consideration is that an open-collector output cannot operate as a push-pull logic output without external circuitry. The pull-up resistor determines the rise time, available current, and power loss, while the output node should remain within the voltage limits of the connected logic family. Input common-mode range, output sink current, response time, and offset-voltage limits should be verified in the manufacturer datasheet before using the device outside the verified operating conditions. This page combines the verified manufacturer and distributor specifications, same-package drop-in alternatives, practical comparator design guidance, and application-focused selection information. It also distinguishes verified values from parameters that still require confirmation from the complete LM393 datasheet or a specific alternative manufacturer's documentation.

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LM393N - Dual Comparator 2-36V Open-Collector | 8-PDIP
LM393N

LM393N - Dual Comparator 2-36V Open-Collector | 8-PDIP

The LM393N is a classic dual low-power low-offset-voltage comparator from the LM193/LM393/LM2903 family originally introduced by National Semiconductor and now multi-sourced by Texas Instruments, Fairchild (onsemi), Motorola, NXP, and others. It integrates two independent precision voltage comparators in an 8-pin PDIP (through-hole, DIP-8) package, designed to operate from a single supply rail of 2 V to 36 V or from split supplies of ±1 V to ±18 V. Each comparator features an open-collector output that can sink up to 16 mA and drives loads referenced to ground or any positive rail up to 36 V, making it ideal for level translation between incompatible logic domains. A comparator is an analog decision element that compares two input voltages and produces a logic-level output indicating which input is larger. The LM393N fits within a hierarchy of: comparator -> analog comparator -> signal-conditioning IC -> semiconductor. Within the broad comparator category, the LM393N belongs to the low-power, low-offset, open-collector-output class (synonym: voltage comparator), distinct from the LM339 quad family and the more modern CMOS comparators such as the LMV393 and LM393LV. Key specifications of the LM393N include: input offset voltage as low as 2 mV maximum (LM193/LM193A series; typical LM393 spec is ±5 mV), input bias current of 25 nA typical, common-mode input range that includes ground, and a propagation delay of approximately 1.3-1.5 microseconds. The open-collector output stage requires a pull-up resistor (typically 2-10 kohm from output to the positive logic rail). The device operates across a -40 C to +85 C ambient temperature range and is widely used in battery-powered systems thanks to its low quiescent current draw (typically 0.4 mA per comparator). Typical applications of the LM393N include zero-crossing detectors for AC line signals, battery voltage monitors and low-battery cutoff circuits, window comparators, over-voltage and over-current protection circuits, square-wave/relaxation oscillators, voltage level shifters (e.g., 5 V CMOS to 12 V relay logic), and analog sensor threshold detectors for photodiodes, thermistors, and Hall-effect sensors. The wide supply range and ground-sensing input make it especially useful in single-rail automotive and industrial 12 V/24 V systems. When designing with this device, remember that the open-collector output cannot actively source current - you must provide a pull-up resistor on each output. Also, the input common-mode range is limited to 0 V to VCC-1.5 V; inputs that approach the upper rail may saturate the input stage. For low-voltage (<5 V) battery applications where lower quiescent current is critical, consider the LMV393 (CMOS) or LM393LV as direct upgrades.

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LM393NG - Dual Open-Collector Comparator, 36 V | onsemi
LM393NG

LM393NG - Dual Open-Collector Comparator, 36 V | onsemi

onsemi LM393NG is a dual independent precision voltage comparator with an operating supply range of 2 V to 36 V, housed in an 8-pin PDIP package. The device provides two separate comparator channels, supports single or split supply operation, and uses open-collector outputs. Its input offset voltage is specified as low as 2.0 mV, while the differential input voltage range can extend to ±38 V. The LM393NG is intended for general-purpose industrial, automotive, consumer, and educational designs where two independent threshold or sensing functions are required. A voltage comparator is an analog integrated circuit that compares two input voltages and produces a logic-level indication of their relationship. In the hierarchy of electronic components, the LM393NG is a dual comparator, part of the comparator and analog signal-conditioning family used between sensors, switching circuits, and digital logic. Because its open-collector outputs require an external pull-up resistor, the device can directly interface with TTL, CMOS, and MOS logic while remaining flexible in voltage and polarity. The LM393NG's principal advantages are its two independent channels, low offset voltage of 2.0 mV, 250 nA input current specification, and ability to operate from a single supply or with split supplies. Its common-mode input range includes ground during single-supply operation, making it practical for battery-powered and low-side sensing systems. The open-collector architecture also permits the output transistor to remain off when the device is unpowered, subject to the detailed limits stated by the manufacturer. Technically, the LM393NG combines independent comparator channels with output stages designed for wired-open-collector use. A pull-up resistor sets the output high state, while the comparator pulls the output low when its condition is met. Because the output is not actively driven high, output rise time depends on the pull-up resistance and the capacitance connected to the output node. Designers should therefore avoid excessive pull-up resistance when fast transitions or low propagation delay are important. Typical uses include window monitoring for power rails, sensing battery voltage, comparing a sensor against a reference, detecting overtemperature, building simple oscillator and relay-drive circuits, and generating control signals for industrial or automotive equipment. Split-supply operation is useful where signals may be centered around ground, while single-supply operation supports systems whose available inputs remain between ground and the positive supply. The main PCB considerations are correct orientation, adequate bypassing near the supply pins, and unobstructed pull-up access at each open-collector output. Confirm input common-mode limits, output-current capability, and absolute maximum ratings against the manufacturer datasheet before applying the comparator outside nominal supply conditions. Keep sensitive feedback networks away from switching-node and high-current return paths to avoid offset errors and unstable switching behavior. This page combines the verified onsemi, DigiKey, and Mouser product information with practical comparator-selection guidance, same-package alternatives, and design notes intended to make LM393NG sourcing and implementation decisions more efficient than a basic distributor listing alone.

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LM393P - Dual Comparator, 2V-36V, Open-Collector, 8-PDIP | Texas Instruments
LM393P

LM393P - Dual Comparator, 2V-36V, Open-Collector, 8-PDIP | Texas Instruments

The Texas Instruments LM393P is a dual-channel differential comparator with open-collector outputs, housed in an 8-pin PDIP (P) through-hole package. The device contains two independent precision voltage comparators designed to operate from a single supply over a 2V to 36V range, or from dual supplies of ±1V to ±18V, with a typical response time of approximately 1.3 us and a propagation delay of 300 ns. A voltage comparator is a fundamental analog building block that compares two input voltages and produces a digital logic-level output indicating which input is larger. Comparators belong to the broader category of analog comparators -> signal conditioning ICs -> amplifiers and comparators -> analog ICs -> semiconductors. The LM393 family is one of the industry's longest-standing and most widely second-sourced comparator designs, making the LM393P a staple in through-hole commercial, industrial, and educational designs. Open-collector outputs allow the user to define the output high level via an external pull-up resistor to any reference voltage, including a logic level different from VCC, enabling level shifting and OR-wired multi-comparator topologies. Key features include a maximum input offset voltage of ±5 mV, an input bias current of 25 nA typical, a quiescent supply current of 0.4 mA typical (independent of supply voltage), and an open-collector output capable of sinking up to 16 mA. The wide supply range (2V to 36V single supply) and low input bias current make the LM393P well suited to direct interfacing with sensors, op-amp outputs, and TTL/CMOS logic families without additional level translation. Each comparator channel consists of a low-offset differential input stage followed by an open-collector NPN output transistor. The output transistor is OFF when the non-inverting (+) input is at lower potential than the inverting (-) input, and saturates to pull the output LOW when + exceeds -. Designers commonly add an external pull-up resistor (typically 10 kohm to VCC) to establish the HIGH level, which is critical because an open-collector output cannot actively drive HIGH. Typical applications include zero-crossing detectors, over/under-voltage monitors, battery low-detection circuits, window comparators, oscillators, Schmitt triggers, and sensor signal conditioning for industrial, automotive, and consumer designs. The LM393P's through-hole PDIP package supports breadboard prototyping, educational labs, and legacy through-hole PCB designs where surface-mount variants (LM393D, LM393DR) are unsuitable. When designing with the LM393P, place a 0.1 uF bypass capacitor as close as possible to the VCC pin and ensure the pull-up resistor value is sized against the desired output rise time and load capacitance. Avoid driving the output above the maximum collector-emitter voltage of 36V and respect the absolute maximum input common-mode range of -0.3V to VCC to prevent input stage damage. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, with verified values drawn from TI product page, DigiKey catalog, and the LM393B/LM2903B datasheet family specification table.

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LM393P3 - Dual Open-Collector Comparator | Texas Instruments
LM393P3

LM393P3 - Dual Open-Collector Comparator | Texas Instruments

Texas Instruments LM393P3 is a dual differential voltage comparator in an 8-pin plastic dual in-line package (8-PDIP). The device provides two independent comparison channels with open-collector outputs, allowing each output to be pulled up to a compatible logic supply and to drive multiple wired-open-collector loads. According to the supplied manufacturer and distributor records, the LM393 family is intended for commercial-grade applications and operates from a 2 V to 30 V supply range, with a 0 °C to 70 °C operating-temperature classification. A comparator is a linear integrated circuit that evaluates two input voltages and produces a logic-level result indicating which input is higher. In the LM393, two comparators share a common supply and ground while retaining separate non-inverting, inverting, and output connections. This dual-channel architecture belongs to the comparator IC hierarchy, where the LM393 occupies the general-purpose, low-power, open-collector segment of the broader analog and power-management semiconductor category. The principal engineering benefit is the open-collector output architecture. Unlike a totem-pole output, an open collector does not actively drive the output high, allowing a pull-up resistor to establish the high logic level. This supports wired-open-collector or wired-AND behavior, permits different supply domains for the pull-up rail, and requires an external pull-up on every output used in a design. The two channels can therefore implement independent threshold decisions, window detection, or complementary comparisons. The LM393P3 uses the standard LM393 differential-comparator architecture rather than rail-to-rail input stages. Input behavior must therefore be evaluated against the device's common-mode and differential input limits in the manufacturer datasheet, especially when comparing signals near either supply rail. Because the verified records do not provide numerical input-offset, response-time, input-bias-current, output-sink-current, or channel-separation figures, those values require confirmation in the official LM393 datasheet before precision timing or sensing decisions are finalized. Typical uses include industrial sensor thresholding, overvoltage and undervoltage detection, battery monitoring, control-loop signal comparison, and digital-interface adaptation. A practical application places the signal under test on one input and a reference voltage from a divider on the other; the open-collector output then changes state when the relation between the two voltages changes. A pull-up resistor converts the output state to a valid logic voltage, while hysteresis can reduce repeated switching when a slowly changing input crosses the reference. For a new design, verify the required output current, input range, temperature grade, and logic compatibility against the datasheet before releasing the schematic. Do not omit the output pull-up resistors, and do not assume that the open collector can source current. Check whether a logic-family or application-specific comparator offers lower offset, faster response, rail-to-rail input operation, push-pull outputs, or automotive qualification. This page combines the verified product records with package, sourcing, comparison, and design guidance focused on drop-in replacement decisions.

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LM393PE3 - Dual Open-Collector Comparator | Texas Instruments
LM393PE3

LM393PE3 - Dual Open-Collector Comparator | Texas Instruments

Texas Instruments LM393PE3 is a dual differential comparator with two independent comparison channels, a 2 V to 36 V supply range, and open-collector outputs in an 8-pin PDIP package. Each channel compares two inputs and supports single-supply or dual-supply operation, making the device suitable for threshold detection, signal conditioning, and open-collector bus interfacing. A comparator is an analog integrated circuit that evaluates two input voltages and changes its output state when one input becomes higher than the other. Within the device hierarchy, the LM393 is a dual comparator, a linear integrated circuit, and a signal-conditioning component commonly used ahead of digital control systems. Its open-collector architecture requires an external pull-up resistor, allowing wired logic, level translation, and multiple output devices to share a common signal line. The LM393 family provides low input offset voltage, low input bias current, low supply current, and fast response time. The manufacturer identifies improved B-version performance, including a 0.37 mV low input offset, 3.5 nA low input bias current, 200 µA supply current per comparator, a 1 µs response time, and an extended temperature range. The LM393PE3 also supports TTL, MOS, and CMOS-compatible output interfacing. Each comparator section includes a non-inverting input, an inverting input, and an open-collector output. The open-collector transistor can pull its output low but cannot actively drive the node high, so the output voltage is established by the pull-up resistor and supply voltage. Separate inputs allow two thresholds or two sensed quantities to be monitored independently within one package. Typical uses include DC voltage-window detection, battery monitoring, industrial sensor interfaces, overvoltage and undervoltage protection, digital control thresholds, and open-collector alarm signaling. In these applications, the device converts an analog condition into a logic-compatible event without requiring a separate precision reference or output driver. A primary design consideration is the open-collector pull-up network. Select a resistor that provides adequate sink current at the device's output-saturation limit while keeping rise time acceptable for the connected load. Also verify input common-mode range, supply voltage, output pull-up voltage, and the required logic thresholds across temperature and supply tolerance. This product page combines manufacturer specifications, replacement guidance, application analysis, and design-focused comparison information to help engineers evaluate the LM393PE3 for through-hole dual-comparator designs without relying on raw catalog listings alone.

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