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LM339ADG4 - Quad Differential Comparator | Texas Instruments
LM339ADG4

LM339ADG4 - Quad Differential Comparator | Texas Instruments

Texas Instruments LM339ADG4 is a quad differential comparator containing four independent general-purpose comparator channels. Each channel compares two input voltages and drives an open-collector output, with a listed propagation delay of 300 ns. The device accepts a 2 V to 36 V single supply and can also operate from dual supplies when their total voltage falls within the specified range. It is packaged in a 14-pin SOIC for through-hole-era circuit compatibility and surface-mount assembly. A differential comparator is an analog integrated circuit that evaluates the relationship between two input voltages rather than operating as a conventional high-gain amplifier. If the non-inverting input is higher than the inverting input, the associated output transistor turns on; reversing the inputs changes the output state. The LM339 belongs to the comparator IC, analog comparator, and general-purpose semiconductor hierarchy used for threshold detection, level sensing, waveform conversion, and control decisions. The four open-collector outputs can sink current but require an external pull-up resistor to establish a high output voltage. This arrangement supports wired logic, relay or lamp drive, and interfacing with TTL, MOS, and CMOS circuits. The manufacturer identifies the device as a standard general-purpose comparator, while the listed 300 ns response time and 0.8 mA typical supply-current drain make it appropriate for circuits where propagation delay and supply demand are more important than nanosecond-class response. The wide 2 V to 36 V supply range supports industrial control, automotive-style interface circuits, power-supply monitoring, and legacy logic designs. A differential input range equal to the maximum-rated supply voltage allows substantial input swing around ground when suitable supply arrangements are used. The open-collector architecture is particularly useful when multiple comparator channels must share a pull-up or when the output must drive a device requiring more current than the comparator can source directly. Designers should pay close attention to common-mode input limits, output pull-up values, and the distinction between single- and dual-supply operation. Because the outputs are open collector, leaving them without a pull-up can produce an undefined logic level. Inputs and outputs should also be checked against the electrical limits in the manufacturer datasheet when operating near the 36 V maximum supply. This page brings together the verified LM339ADG4 specifications, package details, application guidance, same-footprint alternatives, and practical selection considerations. It is intended to help engineers confirm compatibility quickly while retaining the datasheet as the authoritative source for absolute maximum ratings, test conditions, and detailed timing behavior.

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LM339ADR2 - Quad 18V/36V Comparator | ON Semiconductor | SOIC-14
LM339ADR2

LM339ADR2 - Quad 18V/36V Comparator | ON Semiconductor | SOIC-14

The ON Semiconductor LM339ADR2 is a quad differential comparator in a 14-pin SOIC tape-and-reel package. The manufacturer listing identifies it as a Quad Single Supply Comparator and a Comparator Quad 18V/36V, indicating operation from a single supply with high-voltage input capability. Four independent comparator channels provide a practical way to monitor multiple control, sensing, or protection signals without using four separate single comparator packages. A voltage comparator is an analog mixed-signal semiconductor that compares an input voltage with a reference voltage and produces a logic-level indication of their relationship. Quad comparators belong to the broader comparator and amplifier IC hierarchy, where they are used for threshold detection, overvoltage and undervoltage monitoring, signal conditioning, and control-system decision making. Their open-collector-style outputs are commonly associated with flexible system-level interfacing, although the exact output configuration should be confirmed in the manufacturer datasheet. The LM339ADR2's four-channel architecture gives designers independent comparator functions in one package. This can simplify analog front ends that compare a sensor signal against a configurable threshold, evaluate a feedback voltage, or supervise a system rail. The 14-pin SOIC package provides a conventional surface-mount footprint suitable for automated assembly, while tape-and-reel packaging supports standard production handling. The LM339ADR2 family is associated with an 18 V/36 V comparator rating and single-supply operation. These figures make the device relevant to industrial, automotive-style, and embedded control systems where input voltages can exceed the common rail of many low-voltage comparators. Designers must still observe the exact common-mode, differential-input, supply-voltage, output-current, and absolute-maximum limits listed for this exact orderable device. Typical uses include DC overvoltage detection, undervoltage supervision, window comparison, sensor thresholding, and industrial control interfaces. In these applications, each comparator can compare a monitored voltage against a reference, while an external pull-up may establish the digital output state when the comparator output is inactive. The comparator is especially useful when a system needs a simple, robust indication rather than a high-speed amplified analog signal. For implementation, begin with the manufacturer's pin-description and electrical-characteristics tables, then connect input, output, ground, and supply pins exactly as specified. Keep sensitive reference and feedback traces short, place input and supply bypassing capacitors close to the device, and check whether the selected logic family and output pull-up arrangement satisfy the system requirements. This page combines the verified manufacturer-oriented part listing, package information, comparison candidates, and practical integration guidance. It distinguishes documented facts from parameters that still require confirmation from the exact LM339ADR2 datasheet, helping engineers plan sourcing and schematic review without relying on a different package variant by mistake.

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LM339ADRE4 - Quad Differential Comparator | Texas Instruments
LM339ADRE4

LM339ADRE4 - Quad Differential Comparator | Texas Instruments

Texas Instruments LM339ADRE4 is a four-channel differential comparator with an open-collector output, a 2 V to 36 V supply range, and a 14-lead SOIC package. Each channel can compare two input voltages, making the device suitable for threshold detection, level sensing, window comparison, and control-system feedback. The comparator family operates from single or dual supplies and provides output compatibility with TTL, MOS, and CMOS logic. A comparator is an analog interface integrated circuit that determines whether one input voltage is above or below another voltage. The LM339ADRE4 belongs to the comparator hierarchy within analog and mixed-signal semiconductors. Unlike an operational amplifier intended mainly for closed-loop amplification, it is optimized for fast, saturated logic-level decisions. Four independent comparators in one package reduce component count and simplify designs requiring several sensing thresholds. The LM339 family provides a low input offset voltage of 0.37 mV, an input bias current of 3.5 nA, and supply current of 200 µA per comparator. Its response time is listed as 300 ns, making it suitable for many industrial, instrumentation, and control applications. The open-collector outputs can sink current and require an external pull-up resistor, allowing the output voltage to be set by the logic supply connected to the pull-up network. The maximum voltage rating reaches 38 V, while the normal operating supply range extends from 2 V to 36 V. Differential input voltage can approach the maximum-rated supply voltage, and the common-mode input range includes ground. This makes the device useful in single-supply sensing circuits where one signal remains near 0 V, as well as in dual-supply comparator arrangements using positive and negative rails. Typical uses include overvoltage and undervoltage detection, industrial sensor interfaces, battery monitoring, temperature threshold circuits, zero-cross detection, and control-loop limit sensing. Four channels allow a compact implementation of window monitoring or multiple independent threshold decisions. The open-collector architecture also supports wired logic when a shared pull-up is used under suitable system conditions. Designers should place input and output components close to the device, account for the open-collector pull-up network, and verify input common-mode and differential voltage limits. Because the outputs are open collector, they cannot source current independently. The pull-up resistor and its connected logic rail determine the high output voltage and rise time, making those values central to the overall switching design.

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LM339ADRG4 - Quad Open-Collector Comparator | Texas Instruments
LM339ADRG4

LM339ADRG4 - Quad Open-Collector Comparator | Texas Instruments

Texas Instruments LM339ADRG4 is a quad differential analog comparator with four independent comparison channels, an open-collector output, up to 300 ns response time, and a 2 V to 36 V supply-voltage range, housed in a 14-pin SOIC package. The device is intended for general-purpose voltage-threshold detection where one input voltage is compared with another and a logic-level decision is required. An analog comparator is an integrated circuit that compares two input voltages and produces a digital output indicating which input is higher. The LM339 family belongs to the broader comparator and signal-conditioning hierarchy, where comparator ICs support threshold detection, sensing, switching, waveform shaping, and simple control loops in industrial, automotive, and consumer electronics systems. Each LM339ADRG4 channel provides independent input comparison and an open-collector output. Open-collector outputs require an external pull-up resistor, allowing the output stage to sink current while leaving the pulled-up voltage under the system designer’s control. This architecture is useful with 5 V, 3.3 V, or other logic levels and supports wired-interface arrangements when multiple outputs share a common pull-up. The wide supply range permits operation from a single supply or from split dual supplies, provided the total supply span remains within the device limits. The low typical supply-current drain of 0.8 mA is independent of supply voltage, which can help limit consumed power in continuously operating equipment. The common-mode input range includes ground, supporting sensing near the lower supply rail in single-supply systems. Typical applications include industrial sensor-threshold circuits, battery and power-supply monitoring, automotive interface and control modules, window or level detection, general-purpose logic threshold conversion, and embedded systems that compare an analog measurement against a reference voltage. Its four independent channels also allow multiple comparisons to be implemented in one package while reducing board area. When designing around the open-collector outputs, select a pull-up resistor that satisfies the required sink current, rise time, and logic-level limits. Account for input offset, common-mode range, and supply headroom when setting a switching threshold. Do not assume that an open-collector output actively drives a high voltage; the external pull-up establishes the high state. This page combines manufacturer and distributor technical information, package-aware alternatives, comparison parameters, and practical design guidance for engineers evaluating the LM339ADRG4. It supports faster component selection while keeping procurement details, replacement constraints, and implementation considerations in one focused reference.

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LM339AM - Quad Open-Collector Comparator | Texas Instruments
LM339AM

LM339AM - Quad Open-Collector Comparator | Texas Instruments

The Texas Instruments LM339AM is a low-power, low-offset, quad differential voltage comparator with four independent comparison channels, an open-collector output stage, and a 14-pin SOIC package. The device supports input voltages spanning ground in the common-mode range, a differential input rating up to 38 V, and compatibility with DTL, MOS, TTL, and CMOS logic families. Its specified operating-temperature range for this ordering code is 0°C to 70°C. A comparator is an analog integrated circuit that compares two input voltages and changes its output state when the non-inverting input rises above the inverting input. The LM339 belongs to the voltage-comparator hierarchy, which falls within analog and mixed-signal ICs and ultimately the broader semiconductor category. Its four channels can operate independently or be configured as two window or hysteretic comparison functions. Key features include four open-collector outputs, low quiescent current, low input offset voltage, and wide input-voltage capability. The open-collector architecture requires an external pull-up resistor and permits several open-collector outputs to share a wired bus when their device-current limits and logic levels are compatible. The 14-pin SOIC package supports conventional surface-mount assembly while providing separate inputs, outputs, and two ground pins. Internally, each channel uses a differential input stage followed by an open-collector output stage. The inputs can be driven near ground, making the device suitable for low-level sensing where the signal of interest lies close to the lower supply rail. Because the outputs are open collectors rather than push-pull outputs, output rise time depends on the pull-up resistor, bus capacitance, and leakage current rather than only on the comparator itself. Typical applications include battery threshold detection, sensor-level conditioning, window comparators, industrial control interfaces, and low-level memory or control monitoring. Industrial systems benefit from the wide common-mode capability, while consumer and communication equipment can use the open-collector outputs directly with pull-up resistors. Four independent channels also reduce the component count in multi-level or multi-signal designs. Designers should verify supply voltage, input common-mode limits, output pull-up values, and propagation delay under the intended load. The open-collector output must never be left without a pull-up path, and unused comparator inputs should be tied to a defined potential to prevent unintended switching. PCB placement should keep pull-up resistors close to the output pins and minimize routing through noisy analog or switching nodes. This page combines the supplied manufacturer and distributor information with practical pin, replacement, application, and design guidance. It also distinguishes verified ordering information from details that must still be confirmed against the manufacturer datasheet before production release.

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LM339AM/NOPB - Low-Power Quad Comparator | Texas Instruments
LM339AM/NOPB

LM339AM/NOPB - Low-Power Quad Comparator | Texas Instruments

Texas Instruments LM339AM/NOPB is a low-power, low-offset quad voltage comparator containing four independent comparison channels in a 14-pin SOIC (D) package. Each comparator supports an input voltage range of 2 V to 36 V, a maximum differential input range of ±18 V, and an open-collector output. The device provides a response time of 1.3 µs, input offset voltage as low as 2 mV maximum across all four comparators, and supply current of 1 mA. A voltage comparator is an analog interface IC that compares two input voltages and produces a digital-level indication of their relationship. In the signal-chain hierarchy, the LM339 belongs to the comparator family within analog and mixed-signal ICs, where it bridges low-level sensing, threshold detection, protection, and logic-level conversion. Its four independent channels allow one package to implement several sensing or protection functions without requiring four separate single-channel devices. The principal features of the LM339AM/NOPB are its low operating power, wide supply-voltage tolerance, open-collector outputs, and broad output compatibility. Open-collector outputs can sink current and require an external pull-up resistor, allowing the output voltage to be set by the connected logic supply. The outputs are compatible with CMOS, DTL, ECL, MOS, and TTL circuits according to the manufacturer information. The 0 °C to 70 °C temperature range identifies this ordering code for commercial-temperature applications. Each of the four channels operates independently, allowing separate reference, threshold, or protection tasks within the same package. The 1.3 µs response time is suitable for general-purpose detection rather than high-speed timing applications. The 2 mV maximum offset specification for the complete quad is important when the difference between two sensed voltages is small. A wide 2 V to 36 V operating range also supports both low-voltage logic systems and higher-voltage industrial sensing environments when the external circuit and device ratings permit. Typical uses include power-supply sequencing, battery monitoring, sensor threshold detection, overvoltage and undervoltage indication, level translation, and simple control-loop sensing. Because the outputs are open collector, pull-up resistors are required when the outputs drive CMOS or TTL inputs. Open-collector stages can also be wired for wired-AND behavior where suitable, although the application must remain within the electrical ratings of every connected channel. Designers should verify input common-mode range, differential voltage, supply current, and output pull-up requirements against the manufacturer datasheet before implementation. Keep sensitive comparator inputs away from switching nodes and high-current return paths, use a stable reference when threshold accuracy matters, and select resistor values that provide adequate logic-high voltage while keeping output current within the channel limit. The 14-pin SOIC package supports conventional PCB assembly, but exposed-pad or other package variants require different layouts.

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LM339AMX/NOPB - 4-Comparator 36V IC | Texas Instruments
LM339AMX/NOPB

LM339AMX/NOPB - 4-Comparator 36V IC | Texas Instruments

Texas Instruments LM339AMX/NOPB is a four-channel, general-purpose voltage comparator IC with open-collector outputs, a 2 V to 36 V supply range, and a 14-pin SOIC package. The device provides a 1.3 µs response time and low input offset voltage, making it suitable for level detection, low-level sensing, memory applications, and general industrial control circuits. A voltage comparator is an analog semiconductor that compares two input voltages and changes its output state when the differential input crosses a defined threshold. The LM339 family belongs to the comparator hierarchy within analog and mixed-signal integrated circuits. Each of its four channels can operate independently, while common power and ground connections simplify implementation across multiple sensing or control functions. The principal features of the LM339AMX/NOPB include four precision comparators, open-collector outputs, single-supply or dual-supply operation, and low power consumption. Its input offset voltage can be as low as 2 mV maximum for all four comparators. The open-collector architecture allows output transistors to be pulled up to a chosen logic voltage, enables wired-AND behavior, and permits use with CMOS, MOS, TTL, DTL, and ECL interfacing when suitable external pull-up circuitry is used. The LM339 architecture is designed for a broad supply range of 2 V to 36 V, or approximately ±1 V to ±18 V in dual-supply operation. A typical response time of 1.3 µs provides adequate speed for threshold detection, overvoltage monitoring, and simple control loops. Because each comparator is electrically independent, unused channels should be configured according to the manufacturer's input and output recommendations to prevent unstable behavior. Typical applications include industrial sensor interfaces, battery and power-supply monitoring, window and level comparators, control-system threshold detection, and low-level sensing. The wide supply range supports both compact low-voltage systems and higher-voltage industrial environments, while the 14-pin SOIC package supports conventional through-hole assembly and automated board assembly. A key design consideration is the open-collector output: every channel requires an external pull-up resistor unless the output is intentionally connected to a wired bus. Select the pull-up voltage to match the receiving logic family, and account for its contribution to supply current and switching speed. This page combines manufacturer specifications, package information, pin assignments, application guidance, and engineering-oriented comparisons to support component selection and PCB implementation.

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LM339AN - Quad Open-Collector Comparator | Texas Instruments
LM339AN

LM339AN - Quad Open-Collector Comparator | Texas Instruments

The Texas Instruments LM339AN is a four-channel general-purpose differential voltage comparator with an open-collector output, a 2 V to 36 V supply range, and a 14-pin PDIP package. Each channel supports single-supply or split-supply operation, while the 1.3 µs response time suits general detection and threshold-control applications. The LM339A family provides a maximum input offset voltage of 2 mV and can operate with input voltages extending to ground on the negative supply. A voltage comparator is an analog integrated circuit that compares two input voltages and produces a logic-level output indicating which input is higher. The LM339AN belongs to the comparator family within analog and amplifier ICs, which sits within the broader integrated-circuit and semiconductor hierarchy. Its four independent channels allow multiple sensing, protection, or control functions to share one package without requiring four separate comparator devices. Key features include four independent comparators, open-collector outputs, 2 V to 36 V operating supply voltage, ±1 V to ±18 V differential input capability, and a 1.3 µs response time. The open-collector architecture provides flexible output interfacing because each output can pull a logic rail low through an external pull-up resistor. This arrangement works with TTL, CMOS, and MOS-compatible logic, although it adds a pull-up component and can expose the output node to more noise when the resistor is weak. The LM339AN uses a low-power bipolar comparator architecture optimized for general-purpose level detection rather than high-speed precision instrumentation. Its common-mode input range includes ground, making it useful in single 5 V or single 12 V systems where a signal approaches zero volts. The 2 mV maximum offset specification for the LM339A family helps limit transition-point error, while the 1.3 µs response time provides useful speed for relay, lamp, and simple control-loop decisions. Typical applications include sensor threshold detection, overvoltage and undervoltage protection, battery monitoring, industrial control inputs, window or level comparators, and general logic interfacing. Four channels can monitor four related signals independently, making the device suitable for multi-parameter protection boards and compact industrial interface modules. The open-collector outputs can drive a relay driver, an optocoupler, a status LED, or a logic input when an appropriate pull-up resistor is installed. Designers should treat all unused input pins carefully, provide adequate input-common-mode headroom, and select a pull-up resistor that balances speed, power, and noise performance. Because the outputs are open collector, multiple LM339AN channels may share a common pull-up node when their wired-OR behavior is acceptable. PCB creepage, grounding, and the relationship between the measured signal and the comparator threshold are equally important for reliable industrial operation. This page combines the verified manufacturer and distributor information for the LM339AN with package-specific pin mapping, transparent sourcing, and practical design guidance. It also distinguishes direct same-package alternatives from the broader LM339 family, helping engineers evaluate replacement options without confusing electrical equivalence with guaranteed mechanical or temperature-grade equivalence.

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LM339AN/NOPB - Quad Open-Collector Comparator | TI
LM339AN/NOPB

LM339AN/NOPB - Quad Open-Collector Comparator | TI

Texas Instruments LM339AN/NOPB is a low-power, low-offset-voltage quad differential comparator with four open-collector outputs in a 14-pin PDIP package. Each comparator supports input common-mode operation from ground to 36 V and can operate from a single supply or split ±18 V supplies, making it suitable for industrial control, sensing, and interface circuits. The package measures 0.3 inch wide and supports insertion-style PCB mounting. A differential voltage comparator is an analog integrated circuit that compares two input voltages and changes its output state according to their relationship. The LM339 belongs to the comparator hierarchy within analog interface ICs and power-management systems. Its four independent channels let one package implement several threshold, window, overvoltage, or polarity decisions while sharing a common supply and ground. Each LM339 channel provides low-offset operation, low input bias current, and an open-collector transistor output. Open-collector outputs permit wired AND or NOR logic, use pull-up resistors, and can directly interface with TTL, MOS, and CMOS-compatible inputs. The ability to set a rising or falling threshold with external resistors makes the device useful for both positive-going and negative-going decisions. The architecture contains four independent comparator sections rather than a shared digital control interface. Because the outputs are open collector, output speed depends on the pull-up resistance, load capacitance, transistor sink current, and the time required to discharge the load node. Low output voltage and a small number of external components also make the LM339 practical where the logic load is tolerant of a passive pull-up network. Typical uses include DC voltage threshold detection, temperature-sensor signal conditioning, battery and power-supply monitoring, motor or relay control, window comparators, and industrial sensor interfaces. The 14-pin PDIP package is especially useful for through-hole assemblies, prototype boards, repair work, and designs where socketed or manually inserted components simplify maintenance. When assigning inputs, keep each noninverting and inverting connection within the comparator's permitted common-mode range, and do not allow the differential input to exceed the device's absolute maximum rating. Select a pull-up resistor that provides adequate sink-current margin and a rise time compatible with the downstream logic. Because an open-collector output can remain off, the external pull-up also determines the inactive logic level. This product page combines the exact LM339AN/NOPB ordering information with package dimensions, pin assignment, practical interface guidance, and technically qualified substitution options. It supports faster component selection by showing where the part fits, which electrical details require confirmation from the manufacturer datasheet, and how candidate replacements differ in temperature grade or low-power behavior.

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LM339ANG4 - 4-Channel 30V Differential Comparator | Texas Instruments
LM339ANG4

LM339ANG4 - 4-Channel 30V Differential Comparator | Texas Instruments

Texas Instruments LM339ANG4 is a four-channel differential comparator integrated circuit with an open-collector output architecture, a 2 V to 30 V single-supply range, and a 14-pin through-hole DIP package. Each of its four independent comparator channels compares two input voltages and provides a logic-level indication of their relationship, making the device suitable for threshold detection, level translation, sensing, and industrial control functions. A comparator is an analog integrated circuit that converts the relationship between two voltages into a digital output state. The LM339 belongs to the comparator IC family, within the broader hierarchy of analog semiconductor and signal-conditioning devices. Unlike a general-purpose operational amplifier used primarily for closed-loop amplification, a comparator is optimized to determine whether one input is above or below another, commonly for sensing and switching applications. The four-channel architecture reduces the number of packages and PCB connections needed for multi-threshold systems. Key characteristics include a maximum input offset voltage of 3 mV at 30 V, maximum input bias current of 0.25 µA at 5 V, and typical output current capability of 20 mA. The open-collector outputs can sink current for driving pull-up networks and interfacing with TTL, MOS, and CMOS-compatible logic, although an external pull-up resistor is required. The device accepts a wide single-supply operating range of 2 V to 30 V and a dual-supply range of ±1 V to ±15 V. This voltage tolerance makes it useful in industrial, automotive-adjacent, instrumentation, and embedded systems where sensing nodes may exceed ordinary low-voltage logic rails. The A-version LM339ANG4 is identified in the manufacturer documentation as an active quad differential comparator in a 14-DIP package measuring 0.300 inch, or 7.62 mm, across the lead row. Typical applications include DC overvoltage and undervoltage detection, sensor threshold switching, window comparators, relay-control interfaces, battery monitoring, and four-channel process-signal conditioning. Because the outputs use open-collector transistors, pull-up resistors can be selected to match the voltage and current requirements of the following logic family. The shared supply architecture also simplifies dual-polarity sensing around ground. Designers should verify input common-mode limits, output pull-up values, and channel-to-channel behavior before implementation. Input protection, filtering, and hysteresis may be required when sensed signals contain noise or when the comparator output must remain stable around a switching threshold. The 14-pin DIP through-hole package also provides ample spacing for hand assembly, prototyping, and serviceable industrial electronics. This product page combines the manufacturer device information with practical application guidance, package-level design considerations, and a structured comparison of compatible quad comparator options for easier component selection and PCB planning.

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LM339APWG4 - 4-Channel 30V Comparator | Texas Instruments
LM339APWG4

LM339APWG4 - 4-Channel 30V Comparator | Texas Instruments

The Texas Instruments LM339APWG4 is a four-channel differential comparator IC with open-collector outputs, operating from a single 2 V to 30 V supply or from split ±1 V to ±15 V supplies in a 14-pin TSSOP package. It compares two input voltages at each channel and produces a digital indication of their relationship. The part is intended for general-purpose industrial, consumer, and automotive-style signal-processing systems. A comparator is an analog interface IC that converts the relationship between two voltages into a logic-compatible output. The LM339 belongs to the wider comparator hierarchy, which sits between general-purpose analog signal conditioning and digital control. Each of its four independent channels includes a non-inverting input, an inverting input, and an open-collector output, allowing a system to monitor thresholds, detect crossings, or supervise external signals. Key features include a maximum rating of up to 38 V, a differential input range equal to the maximum-rated supply voltage, and operation with common-mode input voltage extending to ground. According to the Texas Instruments LM339 product page, the outputs are compatible with TTL, MOS, and CMOS logic. The open-collector architecture requires an external pull-up resistor and gives the designer control over rise time, output level, and wired-output behavior. The LM339 family is designed for single-supply or dual-supply operation, providing flexibility in industrial control, automotive electronics, and low-voltage systems. Its differential inputs support direct comparison of sensor outputs or two analog nodes, while the wide supply range permits use from modest single-rail systems through higher-voltage industrial environments. The A version provides tighter input characteristics than the standard LM339 variant, including a low input offset of 0.37 mV and low input bias current of 3.5 nA. Typical uses include level detection, window comparators, overvoltage monitoring, temperature-control loops, zero-cross detection, and low-level sensing. The four channels can also be arranged as two independent window comparators, or used for mixed tasks such as a sensor threshold, a supply supervisor, and a timing comparator within one package. Designers must account for the open-collector output and its pull-up network, verify the common-mode and differential input limits, and maintain adequate logic-level compatibility. Input protection, hysteresis for noisy analog signals, and stable bypassing of the supply rails are essential for reliable operation. Because the output is open collector, multiple channels or external devices can share a pull-up when their logic states do not conflict. This page combines the manufacturer’s device description, verified distributor specifications, lifecycle information, same-package replacement guidance, and practical design notes. It helps engineers identify whether the LM339APWG4 fits a four-channel open-collector design while distinguishing it from newer dual-channel, rail-to-rail, and push-pull comparator families.

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LM339D - 4-Comparator Open-Collector IC | Texas Instruments
LM339D

LM339D - 4-Comparator Open-Collector IC | Texas Instruments

The Texas Instruments LM339D is a general-purpose quad differential voltage comparator containing four independent comparator channels, open-collector outputs, and operation from a single positive supply in a 14-pin SOIC package. The verified manufacturer data identifies a maximum rating up to 38 V, input offset voltage of 0.37 mV, input bias current of 3.5 nA, supply current of 200 µA per comparator, and response time of 1 µsec for the related LM339 family. These values make the device suitable for level detection, low-level sensing, memory applications, and general industrial threshold circuits. A voltage comparator is an analog comparator that evaluates two input voltages and changes its output state according to their relationship. The LM339 belongs to the comparator, analog IC, and signal-conditioning hierarchy. Unlike an op-amp configured for linear amplification, a comparator is intended for open-loop decision making. Its open-collector output requires an external pull-up resistor and can be wired with multiple comparator outputs when the electrical conditions permit. The four independent channels allow one package to perform several threshold decisions. Open-collector outputs can interface with TTL, MOS, and CMOS-compatible circuits according to the family documentation, while the wide supply capability supports industrial and automotive-style environments. The low input bias current is useful when the comparator senses high-impedance sources, although input offset, common-mode range, output saturation, and supply limits must still be checked in the complete design. The LM339 family is supported by TI’s application guidance for TL331, LM339, and LM393 devices, which emphasizes correct use of open-collector outputs, pull-up networks, input protection, and supply bypassing. The package and pin arrangement should be verified against the selected manufacturer’s datasheet before layout release, especially when replacing a part sourced from another manufacturer. Typical applications include sensor threshold detection, battery or power-system monitoring, window comparator circuits, logic-level translation, relay or solenoid drive interfaces, and industrial control inputs. An external pull-up resistor is normally placed from each output to the downstream logic supply so that the open-collector transistor can pull the line low and release it high. The main design consideration is that an open-collector output is not a push-pull logic output. Choose the pull-up voltage and resistor for the receiving device, verify output sink current, and account for the positive logic level at the receiver input. Place bypass capacitors close to the supply pins and keep sensitive input traces away from output and switching-current paths. This product page consolidates verified distributor identity, manufacturer family specifications, package information, sourcing links, and engineering-oriented usage guidance. Exact pricing, stock, alternative parameter tables, and manufacturer-specific pin details remain dependent on the cited source pages and are not inferred where the supplied evidence is incomplete.

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LM339DBRE4 - Quad Comparator, 14-SSOP | Texas Instruments
LM339DBRE4

LM339DBRE4 - Quad Comparator, 14-SSOP | Texas Instruments

Texas Instruments LM339DBRE4 is a four-channel differential voltage comparator in a 14-pin SSOP package. The device supports single-supply or dual-supply operation, has a tested maximum supply voltage of 30 V, and provides a differential input-voltage range equal to the maximum-rated supply voltage, reaching ±38 V. Each comparator has an open-collector output suitable for driving TTL, MOS, and CMOS-compatible loads. A voltage comparator is an analog semiconductor that compares two input voltages and changes its output state when the non-inverting input becomes higher than the inverting input. The LM339 belongs to the broader comparator hierarchy, combining four independent channels in one integrated circuit. This integration reduces component count and simplifies designs requiring multiple threshold, sorting, or signal-level decisions. The principal features of the LM339DBRE4 include four independent comparator channels, an open-collector output architecture, and supply-current drain that is largely independent of supply voltage. The device operates from single or split supplies, with the total supply span specified from 2 V to 36 V. Its input stage supports low input-bias current, while the output stage is designed for compatibility with TTL, MOS, and CMOS logic. Because the outputs are open collector, each channel requires an external pull-up resistor when a logic-high output is required. This arrangement permits the output transistor to remain off during the high state, reducing quiescent demand and allowing bus-oriented implementation. The outputs can also be wired together for wired-AND behavior where appropriate. The differential input range is unusually wide for a comparator, which makes the device useful where signal inputs can exceed the supply-referenced logic thresholds. Typical uses include industrial control and monitoring, sensor-interface thresholds, overvoltage and undervoltage detection, panel and system interlocks, and general-purpose analog decision circuits. Four channels allow one device to supervise several independent conditions. Open-collector outputs are especially useful when a monitored line must pull down a shared alarm or interlock node until every external pull-up has returned to its inactive state. When designing the PCB, place the pull-up resistors close to the relevant output pins and keep comparator input traces away from switching nodes and output-return currents. The wide common-mode and differential ranges support robust industrial systems, but input protection and supply-decoupling practices remain essential when external wiring can introduce transients. Consult the manufacturer datasheet for the complete electrical limits and application guidance. This product page combines package, electrical, application, and substitution guidance for engineers evaluating the LM339DBRE4. It highlights the four-channel open-collector architecture, verified operating attributes, pinout considerations, and same-footprint alternatives that can be screened against temperature range and qualification requirements before design release.

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LM339DE4 - 4-Channel Open-Collector Comparator | Texas Instruments
LM339DE4

LM339DE4 - 4-Channel Open-Collector Comparator | Texas Instruments

The Texas Instruments LM339DE4 is a quad differential comparator containing four independent voltage comparators, with a maximum rated supply voltage of 38 V and an open-collector output configuration in a 14-pin SOIC package. Each channel can compare two differential input voltages, making the device suitable for threshold detection, level translation, sensing, and basic control systems. A comparator is an analog integrated circuit that determines whether one input voltage is above or below another input voltage. The LM339 belongs to the comparator IC category within the broader hierarchy of analog integrated circuits and semiconductors. Its four channels share power and ground connections but operate independently, allowing one package to perform four comparison functions without requiring four separate single-channel devices. Key features include a 38 V maximum rating, low input offset voltage of 0.37 mV, low input bias current of 3.5 nA, and supply-current consumption of 200 uA per comparator. The open-collector outputs can sink current from external pull-up circuitry, which allows a system designer to select the output logic voltage independently and also supports wired-AND behavior when multiple comparator outputs are connected together. The LM339 family supports single-supply or dual-supply operation. Its common-mode input range includes ground, while the differential input range can extend to plus or minus 38 V according to the manufacturer product information. Outputs are compatible with TTL, MOS, and CMOS logic. These characteristics make the device useful where a low-voltage control system must monitor signals operating at higher voltage levels. Typical applications include industrial sensor interfaces, battery monitoring, overvoltage and undervoltage detection, motor-control feedback, window comparators, and digital threshold translation. The four-channel organization is especially useful when a board needs several independent protection or level decisions. Each open-collector output requires an appropriate pull-up resistor unless it drives a compatible external load or relay stage. PCB design should keep comparator inputs away from high-current switching paths and provide a low-impedance ground reference. Place bypass capacitance close to the supply and ground pins, use short analog traces, and avoid connecting long external wires directly to the input pins without suitable filtering. Input protection may be needed when transients or ESD events exceed the application's normal operating conditions. This page organizes the LM339DE4 electrical characteristics, pinout, sourcing guidance, application examples, and qualified same-footprint alternatives into a compact engineering reference. It also identifies the practical differences that must be checked before replacing a comparator in an existing design, particularly supply limits, input common-mode range, output pull-up requirements, and temperature grade.

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LM339DG - Quad Open-Collector Comparator | onsemi
LM339DG

LM339DG - Quad Open-Collector Comparator | onsemi

onsemi LM339DG is a four-channel general-purpose analog comparator designed for single-supply operation from 3 V to 36 V. The device provides four independent comparison channels in a 14-pin SOIC package and uses open-collector outputs compatible with CMOS, TTL, MOS, and wired-open-collector systems. Typical input bias current is 25 nA, while typical input offset current is 5 nA. A quad comparator is an integrated circuit containing four comparison channels on one package. Each channel compares a non-inverting input with an inverting input and produces a logic-level indication of their relationship. Comparators occupy the analog comparator category within interface and signal-conditioning semiconductors. Unlike a precision operational amplifier, a comparator is optimized for fast output transitions and level detection rather than accurate closed-loop amplification. The LM339DG supports the voltage range required by industrial, automotive, and consumer systems. Its low supply-current drain is specified as 0.8 mA typical, and its low input bias current helps reduce errors in high-impedance sensing circuits. The open-collector output architecture permits wired-OR connections, external pull-up resistor selection, and level translation to the logic voltage used by the surrounding system. Outputs require a pull-up resistor because the output transistors do source current. The manufacturer positions the LM339 family for level detection, low-level sensing, memory applications, consumer equipment, automotive electronics, and industrial electronics. Four channels in one 14-pin SOIC can reduce board area when a system compares multiple thresholds, monitors several sensor lines, or implements window detection. Independent inputs allow each channel to establish a separate reference or limit. Circuit design must account for open-collector outputs, input common-mode limits, output pull-up requirements, and unused input states. Pull-ups should use the receiving logic's supply voltage when level translation is required, while their resistance should balance rise time, power consumption, and output-current capability. Unused comparator inputs must be tied to defined reference potentials rather than left floating. The LM339DG is appropriate when one package must provide multiple inexpensive threshold decisions across a wide supply range. It is less suitable when a push-pull output is required without external pull-ups, when input signals exceed the common-mode range, or when the application requires the low offset and noise performance of a dedicated precision comparator. This page combines device specifications, package guidance, replacement analysis, and practical design considerations for faster engineering selection.

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LM339DG4 - 4-Channel Open-Collector Comparator | TI
LM339DG4

LM339DG4 - 4-Channel Open-Collector Comparator | TI

The Texas Instruments LM339DG4 is a four-channel differential analog comparator with open-collector outputs, a 2 V to 36 V supply range, and a 14-pin SOIC package. Each channel compares two input voltages, making the device suitable for threshold detection, level sensing, and industrial control logic. Its low 0.37 mV input offset, 3.5 nA input bias current, 300 ns response time, and 200 uA supply current per comparator provide a practical balance of accuracy, speed, and low power consumption. An analog comparator is an integrated circuit that evaluates a differential input and changes its output when the measured relationship crosses a defined threshold. The LM339 belongs to the comparator hierarchy, alongside general-purpose differential comparators and the broader semiconductor category. Four independent channels in one package reduce board area, while the open-collector architecture allows each output to be pulled up to a local supply voltage and used for wired logic, alarm signaling, or transistor-driver interfaces. The LM339 family supports single-supply or split-supply operation, and its input common-mode range extends close to ground. The low offset voltage helps establish a stable switching threshold, while low input bias current limits disturbance in high-impedance sensing circuits. Its open-collector outputs require an external pull-up resistor and can sink current rather than source a full logic-high voltage. This behavior is useful when driving relays, lamps, or NPN transistors through an appropriate interface stage. The LM339DG4 is a 14-pin SOIC device intended for the 0 °C to 70 °C commercial temperature range. Its four channels share power pins but retain separate input and output connections. The manufacturer identifies a maximum rating of up to 38 V, an ESD rating of 2 kV HBM, and the B-version family improvements include lower offset, lower supply current, faster response, and improved input ruggedness. These characteristics make the device suitable for general-purpose signal conditioning rather than precision instrumentation. Typical applications include industrial sensor thresholds, overvoltage and undervoltage detection, temperature-control logic, battery monitoring, window or level comparators, and discrete transistor control. Because the outputs are open collector, the same package can support different logic families by selecting the pull-up voltage appropriately. The device is also useful in educational and prototype circuits where four comparison channels are needed without using four separate packages. Design the pull-up resistor around the output-sink current, required rise time, and available supply voltage. Keep the comparator inputs away from switching nodes and use a stable reference near the threshold when input offset matters. Verify absolute maximum supply voltage, input common-mode limits, output-current limits, and thermal conditions before applying the part in a new design. This page combines the device specifications, application guidance, pin assignment, qualification limits, and technically constrained replacement options for engineers evaluating the LM339DG4. It also identifies where a true same-package drop-in substitution should be reviewed rather than treating every similarly named LM339 variant as electrically identical.

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LM339DR - Quad Differential Comparator, Open-Collector | TI
LM339DR

LM339DR - Quad Differential Comparator, Open-Collector | TI

The Texas Instruments LM339DR is a quad differential comparator that integrates four independent precision voltage comparators into a single 14-pin SOIC package. The device operates from a single power supply over a wide voltage range and is well-suited for use in voltage-level detection, threshold detection, and analog signal conditioning circuits. The LM339DR outputs are open-collector and require a pull-up resistor to a supply ranging from 5V to 36V (or higher), enabling level-shifting between incompatible logic domains. What is an analog comparator? An analog comparator is an active circuit element that compares two input voltages and produces a binary output based on which is larger. Comparators sit alongside op-amps and ADCs in the signal-chain hierarchy: op-amp (linear amplification) -> comparator (1-bit decision) -> Schmitt trigger (hysteresis-based decision). The LM339 family sits in the general-purpose comparator category, optimized for cost and versatility rather than speed or precision. Key features of the LM339DR include a typical input offset voltage of 2 mV, a wide common-mode input voltage range that includes ground, a differential input voltage range equal to the maximum-rated supply voltage, and an operating supply range of 2V to 36V. The device draws a low supply current of approximately 1 mA (200 uA per comparator in the newer LM339B), and outputs are compatible with TTL, MOS, and CMOS logic families. Operating temperature range spans 0C to +70C in the standard commercial grade, with automotive-grade LM2901 variants covering -40C to +125C. The LM339DR architecture uses a bipolar transistor design with Darlington NPN output stages driving open-collector transistors. This architecture provides high input impedance and stable switching thresholds, though response time is in the microsecond range rather than the nanosecond range of high-speed comparators. The device is internally compensated and requires no external frequency-compensation components. Typical applications include overvoltage/undervoltage protection circuits, zero-crossing detectors, oscillator circuits, window comparators, and sensor-signal level translation. Industrial uses include battery chargers, switch-mode power supply feedback loops, and motor-control interface circuits. Designers should note that open-collector outputs require external pull-up resistors and that output transition time is dominated by the RC time constant of the pull-up resistor and load capacitance. For high-speed applications, choose a comparator with push-pull outputs such as the TL331 family. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone TI datasheet, providing engineers a single-point comparison resource.

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LM339DR2 - 3-36 V Quad Comparator | onsemi
LM339DR2

LM339DR2 - 3-36 V Quad Comparator | onsemi

The onsemi LM339DR2 is a four-channel differential comparator for single or split-supply operation, with a 3 V to 36 V single-supply range and a 14-pin SOIC package. The device provides open-collector outputs, low input bias current of 25 nA typical, low input offset current of ±5 nA typical, and low input offset voltage of ±1 mV typical. These characteristics make it suitable for level detection, low-level sensing, memory, industrial, automotive, and consumer applications. A quad comparator is an analog integrated circuit that compares two input voltages and produces a digital logic state indicating which input is higher. The LM339 belongs to the broader comparator hierarchy, which includes differential comparators, analog interface ICs, and semiconductor signal-conditioning devices. Its four independent channels can implement window detection, threshold sensing, relay or solenoid control, and digital interface conditioning within one package. Key electrical features include single or split-supply operation, a typical input bias current of 25 nA, typical input offset current of ±5 nA, and typical input offset voltage of ±1 mV. The open-collector outputs can sink output current while supporting TTL-compatible and CMOS-compatible interfacing. A typical low output saturation voltage is 130 mV at 4 mA, providing a defined logic-low level when the output transistor is conducting. The four comparator sections are electrically independent, allowing each channel to evaluate a separate signal or pair of thresholds. Input ESD clamps improve reliability without changing normal operation. The open-collector architecture requires an external pull-up resistor when the output is used as a logic signal, while the comparator can also directly participate in systems that provide their own pull-up or drive another open-collector node. Typical applications include industrial control systems, automotive sensing circuits, consumer threshold detection, memory address or data qualification, overvoltage and undervoltage monitoring, and interface logic between analog sensors and digital controllers. The low input bias current is particularly useful when the source impedance is high and leakage-induced errors must remain small. Designers should verify common-mode input limits at the selected supply voltages and provide adequate input and output pull-up arrangements for the open-collector nodes. Because output behavior depends on external pull-up strength and load current, check the resulting rise time and logic-level compatibility across the full operating range. This product page consolidates the LM339DR2 electrical characteristics, package details, verified drop-in candidates, and practical design guidance into an engineering-focused reference. It also distinguishes confirmed family-level options from variants that require final qualification against temperature grade, production status, and application-specific limits before release to manufacturing.

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LM339DR2G - 4-Channel 3-36V Comparator | onsemi
LM339DR2G

LM339DR2G - 4-Channel 3-36V Comparator | onsemi

onsemi LM339DR2G is a four-channel general-purpose comparator designed for single-supply operation from 3 V to 36 V, with a response time of 1.3 us in a 14-pin SOIC package. The device provides CMOS, TTL, and open-collector-compatible outputs for level detection, low-level sensing, memory, industrial-control, and automotive applications. A comparator is an analog signal-conditioning semiconductor that compares two input voltages and produces a logic-level output indicating their relationship. The LM339 family combines four independent channels in one package, placing the comparator function within the broader hierarchy of analog integrated circuits, interface ICs, and signal-processing semiconductors. Key features include four independent comparators, 3 V to 36 V single-supply operation, 1.3 us response time, 25 nA typical input bias current, and ±5 nA typical input offset current. Its open-collector outputs support wired logic and pull-up-resistor applications, while the specified CMOS and TTL compatibility allows connection to a broad range of digital control systems. The LM339 architecture is suited to threshold monitoring rather than precision signal amplification. Each channel compares its non-inverting and inverting inputs, allowing the output state to change when the differential input crosses the switching threshold. Low input bias current reduces disturbance of high-impedance sensing networks, while the wide supply range accommodates both low-voltage logic and higher-voltage industrial systems. Typical uses include sensor threshold detection, battery and power-supply monitoring, overvoltage and undervoltage protection, window comparison in control systems, logic-level translation, and memory or interface testing. The comparator can also serve as a simple relay-driver front end when its open-collector output is paired with an appropriate pull-up and external transistor stage. PCB design should keep comparator inputs and feedback components away from switching-current paths and high-impedance nodes. Place bypass capacitors close to the supply pins, use a stable pull-up resistor on every open-collector output, and check input common-mode limits at the minimum and maximum supply voltages before finalizing the layout. This page consolidates the LM339DR2G operating limits, pin assignment, drop-in comparisons, application guidance, and practical layout considerations to support faster component selection, sourcing, and circuit implementation.

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LM339DR2GH - Quad Comparator, 3-36V | onsemi
LM339DR2GH

LM339DR2GH - Quad Comparator, 3-36V | onsemi

onsemi LM339DR2GH is a single-supply quad differential comparator containing four independent comparison channels in a 14-SOIC package. The device operates from 3V to 36V, provides a response time of 1.3 microseconds, and uses open-collector outputs compatible with TTL and CMOS systems. Its four-channel architecture allows one package to supervise four analog signals, reducing component count and board area in threshold detection, protection, and sequencing circuits. A comparator is an analog integrated circuit that compares two input voltages and changes its output state according to their relative relationship. The LM339 belongs to the hierarchy comparator > analog comparator > analog IC > semiconductor. Unlike an operational amplifier configured for closed-loop amplification, a comparator is intended for open-loop decision-making and is typically used where a digital output represents whether one voltage is above or below another threshold. The LM339DR2GH provides four open-collector outputs, allowing each output to be pulled up to a compatible supply voltage through an external resistor. Open-collector outputs are useful when several devices must share a wired bus, but every pulled-up node requires suitable pull-up circuitry. The stated TTL and CMOS output compatibility supports interfacing with both bipolar and field-effect logic families. The 1.3-microsecond response time provides a defined delay for switching decisions without implying zero transition time. The 3V to 36V supply range supports single-supply systems operating across low-voltage logic and higher industrial voltage rails. Split-supply operation is also possible when the circuit requires signals around ground. Because a comparator can tolerate input voltages extending beyond its supply rails within specified limits, designers must still verify the maximum differential input voltage and common-mode input range in the manufacturer datasheet before applying unusual rail or input conditions. Typical uses include battery threshold detection, overvoltage and undervoltage protection, window comparison, sensor conditioning, relay or solenoid drive, oscillator timing, and general analog signal conditioning. The four independent channels are especially useful when a system must compare several rails or thresholds. Each channel should have its own defined input and output arrangement, with unused channels configured according to the manufacturer's guidance rather than left as floating inputs. Design attention should focus on output pull-up voltage and current, input common-mode limits, differential input voltage, output saturation behavior, and the logic levels connected to the open-collector nodes. Keep sensitive input traces away from switching nodes and place pull-up resistors close to the corresponding output pins. The package is a 14-pin SOIC, so check the pin-description table and footprint before assigning PCB nets. This product page organizes the identified LM339DR2GH specifications, same-package alternatives, application guidance, and design considerations into a concise engineering reference. It also separates functional requirements from procurement details so a designer can confirm pin compatibility, operating limits, and implementation constraints before releasing a schematic or layout.

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LM339DRE4 - Quad Open-Collector Comparator | Texas Instruments
LM339DRE4

LM339DRE4 - Quad Open-Collector Comparator | Texas Instruments

Texas Instruments LM339DRE4 is a quad differential analog comparator with four open-collector outputs, a 2 V to 36 V supply range, and a low input offset voltage of 0.37 mV. Each comparator can operate from a single supply or from dual supplies, making the device suitable for threshold detection, level sensing, and industrial control systems. The component is packaged in a 14-pin SOIC surface-mount package. An analog comparator is an integrated circuit that compares two voltage signals and produces a logic-level indication of their relative relationship. Within the broader semiconductor hierarchy, the LM339 belongs to the comparator IC and linear analog IC families. Its four independent channels reduce component count when a system requires multiple sensing, window-detection, or control decisions. Important electrical characteristics include low input bias current of 3.5 nA, low supply current of 200 µA per comparator, a fast response time, and an open-collector output architecture. The open-collector outputs permit wired-AND operation and require an external pull-up resistor. This architecture also gives the designer control over output rise time and logic voltage compatibility. The LM339 supports single-supply operation from 2 V to 36 V. Under dual-supply conditions, the common-mode input range depends on the supply arrangement. The manufacturer datasheet states that neither input should normally be driven more than 0.3 V below the negative supply, while the upper common-mode limit is typically VCC minus 1.5 V. Proper input-range design is therefore essential in battery-powered and mixed-polarity systems. Typical applications include industrial sensor interfaces, battery monitoring, window comparators, overvoltage detection, motor-control logic, and general digital threshold conversion. The quad-channel format is particularly useful when four independent measurements or control points must be handled in one package. Its low input bias current also reduces errors when connected to high-impedance sensing networks. Designers should pull each output up to a suitable supply through an external resistor and account for the open collector's off-state leakage when analyzing bus behavior. PCB placement should keep sensitive input traces away from switching nodes and the pull-up network. Input filtering should use resistors and capacitors selected for the required response time rather than excessively slowing the comparator. This product page combines manufacturer specifications, application guidance, pin-level information, and practical design notes to support component selection and PCB implementation. It also provides structured comparison data for evaluating pin-compatible LM339-family and related comparator options.

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LM339DRG3 - 4-Channel Comparator | Texas Instruments
LM339DRG3

LM339DRG3 - 4-Channel Comparator | Texas Instruments

The Texas Instruments LM339DRG3 is a four-channel differential comparator with open-collector outputs, a 2 V to 36 V single-supply operating range, and a 14-SOIC package. Each of its four independent comparators can operate from single or dual supplies, making the device suitable for threshold detection, industrial signal conditioning, and basic control systems. A comparator is an analog integrated circuit that compares two input voltages and changes its output when the non-inverting input rises above the inverting input. The LM339 family belongs to the hierarchy of comparator ICs, analog signal-processing ICs, and general-purpose semiconductors. Its four open-collector outputs can pull down external loads and interface with TTL, MOS, and CMOS logic when suitable pull-up circuitry is used. The LM339DRG3 provides four independent comparator channels in one 14-pin SOIC package. Its single-supply range extends to 36 V, while operation from dual supplies is also possible. The common-mode input range includes ground, an important feature for monitoring signals referenced to the same ground as the comparator. Open-collector outputs add design flexibility but require an external pull-up resistor when a logic-high output is required. The device is designed for general-purpose applications where the input signals remain within the comparator's supported common-mode and differential voltage limits. The 14-SOIC package provides a practical transition from through-hole designs to surface-mount assemblies while retaining the familiar LM339 channel arrangement. Each comparator is electrically independent, allowing one package to implement four separate decisions or thresholds. Typical uses include industrial sensor-interface circuits, overvoltage and undervoltage detection, temperature-control thresholds, relay or solenoid drive logic, window comparators, and low-frequency control loops. The open-collector stage is especially useful when driving a transistor, indicator, relay interface, or pull-up-connected logic family rather than driving a high-current load directly. When laying out a design, verify that every differential input pair remains within its allowed voltage range and that input nodes do not exceed the supply and ground limits. Place pull-up resistors close to the open-collector outputs, maintain the required input common-mode range, and use a stable bypass capacitor near the supply pin. The open-collector architecture can pull a rail down but cannot source current, so external drive circuitry may be required. This page combines the manufacturer’s LM339 electrical and family information with practical pinout, comparison, sourcing, and layout guidance. It also distinguishes verified drop-in options from package-only substitutions, helping engineers select a replacement while accounting for supply voltage, output topology, operating grade, and lifecycle requirements.

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LM339DRG4 - 4-Channel Open-Collector Comparator | Texas Instruments
LM339DRG4

LM339DRG4 - 4-Channel Open-Collector Comparator | Texas Instruments

The Texas Instruments LM339DRG4 is a four-channel differential comparator IC with open-collector outputs, a 38 V maximum differential input rating, and a 14-pin SOIC package. Each channel supports single-supply or dual-supply operation, while the common-mode input range includes ground. The device provides 0.37 mV low input offset, 3.5 nA low input bias current, 200 µA typical supply current per comparator, and a 1 µs response time. A comparator is an analog integrated circuit that compares two input voltages and produces a logic-level output indicating which input is higher. The LM339 belongs to the voltage comparator hierarchy within comparator ICs, analog ICs, and semiconductors. Its open-collector outputs can sink useful current but require an external pull-up resistor, allowing the output node to operate at a voltage chosen by the system designer and enabling wired logic, level conversion, or multiple-device interconnection. The four independent channels provide flexible use in threshold detection, window comparison, overvoltage monitoring, signal conditioning, and control loops. Its 38 V maximum differential input rating supports industrial signal environments where input transients can exceed the supply voltage. Open-collector outputs are compatible with TTL, MOS, and CMOS logic, and the low 200 µA supply current per comparator supports power-conscious equipment. Internally, the LM339 is designed around four independent comparison channels rather than a shared digital control block. The 1 µs response time supports general-purpose decision making without introducing the delay of a more specialized precision comparator. Its 0.37 mV input offset helps establish switching thresholds accurately, while 3.5 nA input bias current limits disturbance of high-impedance sensing circuits. The manufacturer describes the B-version family as a drop-in replacement for earlier LM239, LM339, and LM2901 A and V versions. Typical applications include industrial control and monitoring, sensor threshold circuits, power-supply sequencing, battery monitoring, relay drivers, window comparators, and embedded control interfaces. The four channels can implement independent decisions in one package, reducing board area when several threshold functions are required. Each open-collector output requires a pull-up network, and the logic family connected to that pull-up determines the resulting high voltage. Designers should treat input common-mode range, supply limits, output pull-up voltage, and output sink current as separate constraints. Keep sensitive comparison inputs away from switching nodes and provide a stable reference near the selected threshold. Place the pull-up resistor close to the output, verify that its voltage remains within the connected logic device's limits, and check the output-state timing against the 1 µs response specification. This page combines manufacturer specifications, functional application guidance, pin-level implementation details, and a parameter comparison of same-footprint alternatives. It is designed to help engineers determine whether the LM339DRG4 provides the required voltage tolerance, response speed, output topology, and package compatibility before incorporating it into a new design.

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LM339DT - Low-Power Quad Voltage Comparator | STMicroelectronics
LM339DT

LM339DT - Low-Power Quad Voltage Comparator | STMicroelectronics

STMicroelectronics LM339DT is a low-power quad voltage comparator containing four independent precision comparison channels in a 14-pin SO-14 surface-mount package. The device supports a 2 V to 36 V supply range and uses open-collector outputs compatible with CMOS, DTL, ECL, MOS, and TTL logic families. Its four independent comparators make it suitable for threshold detection, level translation, sensing, and open-collector wired-OR functions. A voltage comparator is an analog integrated circuit that compares two input voltages and produces a digital logic state indicating which input is higher. The LM339 belongs to the comparator hierarchy, where a comparator IC converts an analog voltage relationship into a logic-level decision. Four independent channels allow one package to perform four separate comparisons, reducing component count when a system requires several monitoring or control functions. The principal benefits of the LM339DT are its low operating power, wide supply-voltage range, and open-collector output architecture. Each output can sink current from a pull-up network, allowing multiple comparator outputs to share a bus for wired-OR operation. The open-collector structure also permits designers to select the external pull-up voltage and logic family, making the device useful in mixed-voltage systems where fixed push-pull outputs would be less flexible. The four internal channels have independent input and output stages but share a common ground reference. Because output current is returned through the open-collector transistor rather than a push-pull output stage, external pull-up resistors are required for normal digital operation. Input common-mode range, differential input limits, response time, output saturation voltage, and input offset voltage must be checked against the actual sensing point and supply conditions before finalizing a circuit. Typical applications include industrial sensor interfaces, battery and power-supply monitoring, window or threshold comparators, relay-control logic, level-crossing detection, and general-purpose embedded control. A single package can implement four independent monitoring channels while preserving the low component count and straightforward hookup of a quad comparator. PCB design should keep comparator inputs away from high-current switching nodes and route the four channels in a way that minimizes common-impedance coupling. Place input and pull-up components close to the device, maintain a low-impedance ground reference, and verify that input transients do not exceed the absolute maximum ratings. The open-collector outputs require suitable pull-up resistors, and any external LED or relay load must include appropriate current limiting or drive circuitry. This page combines the LM339DT specifications, verified manufacturer and distributor links, drop-in replacement guidance, comparison parameters, and practical PCB and circuit-design notes. It is intended to help engineers identify whether the quad open-collector architecture satisfies the voltage, logic-interface, layout, and sourcing requirements of a new design.

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