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LM324NS - Low-Power Quad Op Amp | Texas Instruments | SOIC-14
LM324NS

LM324NS - Low-Power Quad Op Amp | Texas Instruments | SOIC-14

The Texas Instruments LM324NS is a low-power, general-purpose quad operational amplifier packaged in a 14-pin small-outline integrated circuit (SOIC-14). It provides four independent amplifier sections in one package and supports single-supply operation across a wide voltage range, making it suitable for transducer amplifiers, direct-current gain blocks, and conventional op-amp circuits. According to the Texas Instruments LM324-N product page, the device is designed around a low-power architecture whose supply-current drain remains largely independent of supply voltage. An operational amplifier, commonly abbreviated op amp, is an analog integrated circuit that amplifies the voltage difference between its non-inverting and inverting inputs. The LM324 belongs to the general-purpose amplifier category within the broader operational-amplifier hierarchy. It provides practical open-loop performance for cost-sensitive instrumentation, buffering, summing, and feedback-control circuits where rail-to-rail input and output behavior is not required. The common-mode input range includes ground, allowing direct sensing of small signals near the lower supply rail. Key characteristics of the LM324NS include four amplifier circuits per package, a typical supply-current drain of 0.8 mA per amplifier as stated in the available datasheet listing, and a common-mode input range that includes ground. The device is intended for single-supply operation, which simplifies power partitioning in battery-powered and industrial measurement systems. Its 14-SO package also provides adequate pin spacing for conventional through-hole assembly and automated surface-mount handling without requiring a fine-pitch land pattern. The quad organization gives designers four matched amplifier sections in one package while keeping each amplifier electrically independent. This is useful in multi-channel sensor systems where channel-to-channel layout consistency and a shared supply connection simplify routing. Compared with four separate single-amplifier packages, the LM324NS reduces component count, supply-pin count, and board area. The trade-off is that a defect affecting the package can affect multiple amplifier sections. Typical uses include low-frequency sensor signal conditioning, analog summation, current-to-voltage conversion, general-purpose buffering, and audio or industrial control interfaces. Because the common-mode input range reaches ground, the device is especially suitable for sensors whose output sits near 0 V. It is generally not the preferred choice where rail-to-rail swing, low-noise precision performance, high-speed operation, or guaranteed output-current capability is essential. The principal design consideration is supply-voltage headroom. Engineers should verify the input common-mode range, output swing, input-offset voltage, input-bias current, and open-loop gain against the signal being sensed rather than assuming ideal behavior. Decoupling capacitors should be placed close to the supply pins, and unused amplifier inputs must be biased so they remain in a defined state. This page consolidates manufacturer information, distributor pricing, package details, pin assignments, and practical substitution guidance. It also distinguishes direct drop-in alternatives from merely similar amplifier families so procurement and design decisions can be made from one engineering-focused reference.

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LM324NS-MAKS - Quad 1.2 MHz Op Amp | Texas Instruments
LM324NS-MAKS

LM324NS-MAKS - Quad 1.2 MHz Op Amp | Texas Instruments

The Texas Instruments LM324NS-MAKS is a quadruple general-purpose operational amplifier packaged in a 14-pin SOIC. Each amplifier section delivers 1.2 MHz gain-bandwidth product and supports output current up to 30 mA, making the device suitable for low-cost signal conditioning, buffering, sensing, and analog control applications. An operational amplifier is an analog IC that amplifies the voltage difference between its non-inverting and inverting inputs. The LM324 belongs to the general-purpose amplifier hierarchy, combining four amplifiers in one package. It is commonly used where low offset, adequate gain bandwidth, input-stage flexibility, and wide supply flexibility are more important than rail-to-rail operation or very low noise. Each of the four amplifier sections operates from a single positive supply or a split supply arrangement. The internal architecture supports common-mode input behavior appropriate for many sensor, transducer, and control-signal interfaces. Output current capability of 30 mA allows the device to drive moderate loads while also operating as a unity-gain buffer in many practical circuits. The LM324 family is valued for its combination of four amplifier sections, 1.2 MHz gain-bandwidth product, and 30 mA output drive in a 14-pin SOIC. Designers should account for the input and output common-mode ranges, which do not reach the negative supply rail in the same way as rail-to-rail input amplifiers. A bypass capacitor near the supply pins is recommended to reduce supply-related noise and improve transient response. Typical uses include environmental sensors, low-cost audio and communication interfaces, analog control loops, instrumentation buffers, active filters, and general-purpose signal conversion. The device can also serve in educational, industrial, and consumer designs where a stable quad-amplifier package simplifies board layout and reduces component count. For new layouts, place the decoupling capacitor close to the positive supply pin and route the ground return directly to the ground pin. Use the pin-description table and typical application circuits in the manufacturer datasheet when assigning PCB tracks, especially around input, output, and supply connections.

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LM324NSRE4 - Quad 1.2 MHz Op Amp | Texas Instruments | 14-SO
LM324NSRE4

LM324NSRE4 - Quad 1.2 MHz Op Amp | Texas Instruments | 14-SO

Texas Instruments LM324NSRE4 is a quadruple general-purpose operational amplifier containing four independent, internally frequency-compensated amplifiers in a 14-pin SOIC package. The device supports single-supply or split-supply operation, operates across a 3 V to 36 V supply range in the B-version family, and provides a typical gain-bandwidth product of 1.2 MHz with a 0.5 V/us slew rate. Its common-mode input range includes ground, allowing the amplifiers to accept input signals near the lower supply rail in single-supply systems. A general-purpose operational amplifier is a voltage-amplifying semiconductor that uses high open-loop gain and negative feedback to create stable, predictable closed-loop behavior. The LM324 belongs to the operational-amplifier hierarchy within analog and mixed-signal semiconductors. Four independent amplifiers in one package allow compact designs to implement buffers, voltage followers, summing amplifiers, comparators, instrumentation-style signal conditioning, and general feedback networks without requiring four separate packages. Key characteristics include a 1.2 MHz typical gain-bandwidth product, a 0.5 V/us typical slew rate, and a supply-current drain of 0.8 mA typical. The common-mode input voltage range includes ground, which is particularly useful for battery-powered equipment and sensors operating near 0 V. The four amplifiers are frequency compensated, reducing the external compensation components normally required around each output. Their common design is suited to low-frequency signal conditioning rather than high-speed precision analog processing. The LM324NSRE4 architecture is intended for single or dual supplies. With split supplies, the midpoint of the two rails serves as the signal reference; with a single supply, the input and output signals are referenced to ground and must remain within the amplifier’s common-mode and output-swing limits. Because the package contains four independent amplifiers, designers can use unused sections for testing or bring them to a defined state in accordance with the manufacturer’s recommendations. Typical uses include low-cost sensor interfaces, industrial control loops, audio preamplifier stages, audio and communication filters, transducers, test equipment, and instrumentation. The 14-pin SOIC package provides a practical surface-mount option for prototypes, medium-density analog boards, and general-purpose embedded systems where four matched-function amplifier sections reduce board area and assembly cost. Design should account for input offset, output swing, unity-gain stability, source impedance, and supply headroom. Decoupling capacitors should be placed close to the supply pins, and sensitive analog signals should be routed away from switching nodes. The LM324NSRE4 is preferable where cost, supply range, and four integrated amplifiers matter more than the lower offset voltage, wider bandwidth, or faster slew rate offered by precision or high-speed amplifier families. This page organizes the LM324NSRE4 electrical characteristics, package information, replacement candidates, application guidance, and engineering trade-offs into a practical selection reference. It also identifies which replacement details must be checked against each manufacturer’s current datasheet before a component is approved for production.

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LM324NSRG4 - Quad Op Amp in 14-SO | Texas Instruments
LM324NSRG4

LM324NSRG4 - Quad Op Amp in 14-SO | Texas Instruments

The Texas Instruments LM324NSRG4 is a standard general-purpose quadruple operational amplifier containing 4 amplifier circuits in a 14-SO surface-mount package. It is designed for general signal-conditioning applications where four similar amplifier channels can provide consistent voltage amplification, buffering, filtering, or feedback functions within one component. The integrated quad arrangement reduces the number of packages and PCB connections needed for multi-channel analog systems. An operational amplifier is an analog integrated circuit that compares its inverting and non-inverting inputs and drives its output according to the voltage difference between them. Operational amplifiers belong to the amplifier IC hierarchy and are widely used in signal chains spanning sensors, data converters, audio equipment, industrial controls, communications, and instrumentation. Negative feedback shapes the closed-loop behavior, while the amplifier supplies the gain or current required to drive the next stage. The LM324NSRG4 provides 4 amplifier channels in one 14-SO package, making it suitable for designs that require matched functional channels without allocating a separate package for every stage. Its general-purpose classification supports a broad range of conventional analog designs. Because the exact electrical limits, voltage ranges, current capability, noise performance, and temperature ratings are not reproduced in the indexed product excerpts, engineers should use the manufacturer datasheet for final circuit qualification. The quad topology can simplify layouts that require several related functions. A four-channel implementation may handle two differential or buffered channels, four noninverting gain stages, or a mixture of filtering and amplification functions. Combining these blocks in one package can shorten interstage routing and reduce board-space requirements compared with four discrete single-amplifier packages, provided the selected amplifier ratings satisfy every channel requirement. Typical uses include low-frequency sensor conditioning, general voltage buffering, analog signal processing, current-to-voltage conversion, basic active filters, and control-signal interfaces. The device is most appropriate when the design calls for a conventional general-purpose amplifier rather than the low-noise, high-speed, low-power, or precision characteristics associated with specialized operational-amplifier families. Before finalizing the PCB design, assign every pin by consulting the pin-description table in the Texas Instruments datasheet. Preserve the package orientation, route sensitive input and feedback paths away from noisy switching nodes, and include the bypass and compensation components specified by the application circuit. Confirm supply voltage, input common-mode range, output swing, load capability, and stability requirements over the full intended temperature range. This product page organizes the confirmed package and amplifier configuration, identifies a directly documented replacement, and adds engineering guidance for schematic definition, PCB implementation, and alternative selection. It is intended to accelerate component searches while keeping the final design decision tied to the manufacturer datasheet and the electrical requirements of the target application.

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LM324PT - Quad Low-Power Op-Amp, 1.3MHz, TSSOP-14 | STMicroelectronics
LM324PT

LM324PT - Quad Low-Power Op-Amp, 1.3MHz, TSSOP-14 | STMicroelectronics

The STMicroelectronics LM324PT is a low-power quad operational amplifier integrating four general-purpose amplifier channels in a 14-pin TSSOP package, operating from a single 3V to 32V supply or dual supplies of ±1.5V to ±16V, with a 1.3MHz gain-bandwidth product and 0.4 V/us slew rate. An operational amplifier (op-amp) is a high-gain differential voltage amplifier that, with external feedback networks, performs mathematical operations such as amplification, filtering, comparison, and integration. The op-amp sits at the foundation of the analog signal-chain hierarchy: op-amp -> amplifier IC -> analog front end -> signal conditioning system. Quad op-amps like the LM324 family pack four independent channels sharing one supply, reducing board area and BOM cost versus four single amplifiers. Key features of the LM324PT include an input common-mode voltage range that extends down to ground (ground-sensing inputs on single-supply rails), a large DC voltage gain of 100dB, and a very low supply current of approximately 375uA per amplifier. These characteristics make it a cost-effective workhorse for battery-powered and single-supply industrial designs. Architecturally, the LM324 uses a classic bipolar process with PNP input stages that enable the ground-sensing common-mode range, and class-AB output stages that can swing close to the negative rail. The four channels are well matched and thermally coupled, which minimizes offset drift between channels in multi-channel signal conditioning. Typical applications include transducer amplification, active RC filters, voltage comparators and level shifters, LED drivers, and DC gain blocks in consumer and industrial equipment. Design consideration: the LM324 is not a rail-to-rail output device - the output saturates roughly 1.5V below VCC, so set signal swings accordingly to avoid clipping near the positive rail. This page consolidates verified datasheet parameters, drop-in alternatives, pricing tiers, design notes, and comparison data not found together on the manufacturer datasheet.

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LM324PW - 4-Channel General-Purpose Op Amp | Texas Instruments
LM324PW

LM324PW - 4-Channel General-Purpose Op Amp | Texas Instruments

Texas Instruments LM324PW is a four-channel, general-purpose operational amplifier packaged in a 14-pin TSSOP. Each channel provides independent high-gain, frequency-compensated amplification for single-supply or split-supply operation. The device supports low-power operation with a typical supply-current drain of 0.8 mA, while its common-mode input range includes ground for direct sensing near the lower supply rail. An operational amplifier, or op amp, is an analog integrated circuit that amplifies the voltage difference between its two inputs while using negative feedback to control gain, bandwidth, and output behavior. The LM324 belongs to the broader operational amplifier, analog amplifier, and semiconductor hierarchy. Its four independent channels make it useful wherever several low-frequency analog signals must be amplified or conditioned within one compact package. The principal advantages are integration, low power consumption, and the ability to operate from one supply or two split supplies. Four channels reduce package count compared with four separate single op amps. The common-mode input range extending to ground allows the amplifier to process signals close to the lower rail, which is important in battery-powered sensors, audio paths, and control systems. The internal frequency compensation makes the device suitable for general-purpose closed-loop amplifier configurations without external compensation. Each channel is electrically independent, so the four amplifiers can implement separate functions such as sensor amplification, active filtering, buffering, voltage comparison with external reference circuitry, or level shifting. The internal frequency compensation makes the device suitable for general-purpose closed-loop amplifier configurations without external compensation. At low frequencies, this architecture favors straightforward analog design over the wider bandwidth and rail-to-rail input/output performance associated with newer amplifier families. Typical applications include industrial sensor interfaces, audio preamplification, joystick and position sensing, smoke-detector signal conditioning, active filters, and low-cost embedded control systems. The 14-pin TSSOP is particularly useful for compact, surface-mount equipment where analog channel count and PCB area must be balanced. For designs requiring precision offsets, low noise, high bandwidth, rail-to-rail operation, or very low quiescent current, a newer precision or micropower amplifier may be a better architectural choice. When laying out the LM324PW, place input and feedback components close to their associated pins and route sensitive input nets away from switching nodes and high-current paths. Check common-mode, output-swing, and supply limits against the operating conditions. Input and output bypassing capacitors should follow the manufacturer’s recommended network, with attention to capacitor tolerance and stability when driving capacitive loads. This page combines the manufacturer’s device description with application guidance, package information, practical design notes, and a restrained comparison of compatible alternatives. It is intended to help engineers identify whether the LM324PW’s four-channel integration and low-power operation fit a design before moving into detailed schematic, stability, and qualification review.

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LM324PWRE4 - Quad 1.2MHz Op Amp | Texas Instruments
LM324PWRE4

LM324PWRE4 - Quad 1.2MHz Op Amp | Texas Instruments

The Texas Instruments LM324PWRE4 is a four-circuit general-purpose operational amplifier with 1.2 MHz gain-bandwidth product, 1 V/us slew rate, and push-pull output capability in a 14-pin TSSOP package. It operates from single or split supplies covering up to ±16 V, equivalent to a 32 V total span, and provides four independent amplifier channels. The package is designated 14-TSSOP with a stated width of 4.40 mm. An operational amplifier is a voltage-feedback amplifier that uses differential input voltage to control an output voltage. The LM324 combines four independent amplifiers in one package, placing it within the operational amplifier, analog amplifier, and integrated-circuit hierarchies. It is intended for general-purpose signal conditioning, where a low-cost amplifier with a wide supply range and straightforward pinout offers greater utility than a specialized precision or high-speed device. The four channels are independently frequency-compensated, allowing simultaneous operation without a shared bias or gain network. Each channel supports push-pull output operation, while the 1.2 MHz gain-bandwidth product and 1 V/us slew rate make the device suitable for audio, control, instrumentation, and low-to-moderate-frequency closed-loop applications. The 14-TSSOP package provides a compact surface-mount format for multi-channel analog boards. The LM324 family is designed for single-supply or split-supply operation. The manufacturer datasheet identifies operation from single or split supplies over a wide voltage range, while comparison data lists ±16 V, or 32 V total, capability for this device. This range allows the amplifier to process signals referenced to ground, to a midpoint, or to split positive and negative rails when the circuit requires bipolar output under a common ground reference. Typical uses include four-channel sensor conditioning, low-frequency active filtering, audio preamplification, differential measurement stages, and general feedback-control loops. In each case, the amplifier converts a small differential input into an output determined primarily by external feedback components. Its four channels can also implement cascaded stages, buffered sensor outputs, or multiple independent signal paths on one board. PCB design should preserve short feedback paths and place input-referring components close to the relevant amplifier pins. Decoupling should follow the manufacturer's recommended power-pin configuration, while unused channels require appropriate biasing rather than being left floating. Because the TSSOP lead pitch is narrow, assembly capability and solderability should be checked before committing the footprint to a high-volume assembly process. This product record combines the LM324PWRE4 package and electrical information with practical selection guidance, drop-in replacement analysis, and board-level implementation considerations. It is designed to help engineers identify a suitable amplifier, compare documented alternatives, and establish a robust 14-TSSOP layout before schematic release.

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LM324PWRG3 - 4-Channel 1.2MHz Op Amp | Texas Instruments
LM324PWRG3

LM324PWRG3 - 4-Channel 1.2MHz Op Amp | Texas Instruments

The Texas Instruments LM324PWRG3 is a four-channel general-purpose operational amplifier with 1.2 MHz gain-bandwidth product, 0.5 V/µs slew rate, and a 14-pin TSSOP package. Each amplifier is independent, high-gain, and frequency compensated, allowing one device to implement four separate signal-processing functions. An operational amplifier is an analog signal-processing IC that compares two input voltages and drives its output toward the higher input voltage. The operational amplifier category includes instrumentation amplifiers, buffer amplifiers, comparators, and general-purpose amplifiers. Within the power-management and signal-conditioning hierarchy, a quad operational amplifier consolidates four amplifiers into one package while preserving independent input, output, and supply connections. The LM324PWRG3 contains four independent, internally frequency-compensated amplifiers. Its 1.2 MHz gain-bandwidth product supports general-purpose closed-loop amplification, buffering, summing, and differential signal-processing tasks. A slew rate of 0.5 V/µs determines how rapidly the output can follow a changing input waveform, making the device appropriate for low-to-moderate-frequency analog circuits rather than high-speed signal paths. The part operates from a single supply or split supply, which simplifies circuits operating from batteries, laboratory rails, industrial control systems, and mixed positive and negative analog supplies. The four independent amplifier sections allow common-mode and output-reference arrangements to differ between channels, although each section shares the device supply pins. Its general-purpose design favors straightforward signal conditioning over precision instrumentation performance. Typical applications include four-channel sensor buffering, low-frequency active filtering, analog summing and subtraction, transducer signal conditioning, audio preamplification, and general feedback-control circuits. The integrated quad arrangement also reduces board area by replacing four separate single operational-amplifier packages. Each channel remains independently usable, so unused sections can be configured according to stable implementation guidance from the manufacturer datasheet. When laying out the TSSOP-14 footprint, maintain short feedback and signal paths and place input-biasing components close to their associated amplifier pins. Check the configured gain against the 1.2 MHz gain-bandwidth product because practical bandwidth decreases as closed-loop gain rises. Also verify output swing, input common-mode range, supply voltage, and stability requirements for the selected feedback network before releasing the PCB. This product page combines the manufacturer electrical characteristics with package details, application guidance, verified drop-in candidates, and design-focused selection criteria. It is intended to help engineers identify whether the LM324PWRG3’s four-channel general-purpose architecture fits a PCB and signal-chain requirement before requesting sourcing information.

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LM324PWRG4 - Quad 1.2MHz Op Amp in 14-TSSOP | TI
LM324PWRG4

LM324PWRG4 - Quad 1.2MHz Op Amp in 14-TSSOP | TI

The Texas Instruments LM324PWRG4 is a quadruple general-purpose operational amplifier with four independent, high-gain, frequency-compensated amplifiers, a 1.2 MHz gain-bandwidth product, and a 14-pin TSSOP package. It supports single-supply or split-supply operation across a total supply range of 3 V to 32 V, equivalent to ±16 V, and is designed for general-purpose signal amplification from industrial and automotive to consumer applications. An operational amplifier is an analog integrated circuit that compares an input voltage with a feedback voltage and drives its output to reduce the difference between them. The LM324 family belongs to the broader hierarchy of operational amplifier, analog amplifier, linear amplifier, and analog signal-processing IC. Its four independent channels allow one package to provide gain, buffering, active filtering, comparisons, summing, and differential amplification where a quad arrangement reduces board area and component count. The principal features of the LM324PWRG4 include four amplifier channels in one package, a 1.2 MHz gain-bandwidth product, operation from a single 3 V supply or split supplies up to ±16 V, and internal frequency compensation. The device is intended for general-purpose applications rather than precision or high-speed signal chains. Its electrically symmetrical input arrangement supports common circuit configurations, while its industry-standard quad architecture makes it suitable for legacy designs requiring easy migration between compatible implementations. Each channel contains high-gain, frequency-compensated amplification suitable for closed-loop gains from unity upward. Internal compensation avoids the need for an external dominant-pole capacitor in typical closed-loop amplifier configurations. This makes the device useful for general-purpose amplifier blocks, filters, and signal-conditioning stages where the operating frequency remains comfortably below the 1.2 MHz gain-bandwidth product. Because it is not positioned as a low-noise, low-offset precision amplifier, applications with demanding accuracy or high-frequency settling should use a more specialized amplifier family. Typical uses include industrial sensor interfaces, audio preamplification, transducer signal conditioning, active filtering, comparators with reference feedback, battery-powered equipment, and four-channel control or monitoring systems. The wide supply range allows operation from conventional 5 V and 12 V rails as well as higher industrial or automotive supply arrangements. Its TSSOP package also supports compact surface-mount construction when board area matters more than the size offered by larger SOIC packages. For stable operation, connect bypassing capacitors close to the supply pins, keep feedback routing short, and avoid long input traces where noise pickup could affect signal integrity. Check input and output voltage limits, common-mode range, output-current capability, and operating-temperature requirements against the manufacturer datasheet for the specific grade. Do not assume that a quad amplifier with the same footprint has identical offset, noise, common-mode, or load-drive characteristics without checking each replacement part. This product page combines the LM324PWRG4 identification, package information, source datasheets, drop-in candidate screening, practical application guidance, and side-by-side engineering comparisons to support faster component selection and replacement planning.

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LM324QDRQ1 - Automotive Quad Op Amp, 1MHz, RRO | TI
LM324QDRQ1

LM324QDRQ1 - Automotive Quad Op Amp, 1MHz, RRO | TI

The Texas Instruments LM324QDRQ1 is an automotive-qualified quad operational amplifier delivering a 1 MHz gain-bandwidth product and rail-to-rail output (RRO) swing in a 14-pin SOIC (D) surface-mount package. It operates from a single supply of 2.7 V to 5.5 V (or dual supplies of +/-1.35 V to +/-2.75 V), making it well suited to battery-powered and low-voltage automotive systems. An operational amplifier (op amp) is a high-gain differential-input voltage amplifier and one of the most fundamental building blocks in analog electronics, used for signal conditioning, active filtering, and mathematical operations. Within the analog IC hierarchy, general-purpose op amps belong to linear integrated circuits, alongside comparators, voltage references, and voltage regulators. Quad op amps like this device integrate four matched amplifiers on a single die, saving board space and improving channel matching in multi-channel signal chains. Key features include rail-to-rail output swing that maximizes dynamic range at low supply voltages, a maximum input offset voltage of 4 mV, and a typical common-mode rejection ratio (CMRR) of 65 dB. Each amplifier draws approximately 100 uA of quiescent current, enabling low-power designs, while internal frequency compensation guarantees unity-gain stability without external components. Technically, the device uses bipolar process technology for good linearity, includes short-circuit protection and output current limiting for robustness, and specifies output current capability of around 160 mA per channel under rated conditions per distributor data. The AEC-Q100 qualification and wide temperature rating make it suitable for harsh automotive environments with 3.3 V and 5 V microcontroller-based systems. Typical applications include automotive sensor signal conditioning (temperature, pressure, and position sensors), battery management system monitoring front-ends, and motor control circuits paired with MCUs such as TI C2000 and MSPM0 families. Design tip: decouple the supply pin with a 0.1 uF ceramic capacitor placed close to the device, and respect the input common-mode range, which extends from ground to VCC - 1.5 V, to avoid phase-reversal and nonlinear behavior near the upper rail.

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LM324QT - Quad Low Power Op Amp, 1.3MHz | STMicroelectronics
LM324QT

LM324QT - Quad Low Power Op Amp, 1.3MHz | STMicroelectronics

The LM324QT from STMicroelectronics is a quad general-purpose operational amplifier in a compact 16-pin QFN (3x3 mm) package. It operates from a single power supply over a wide voltage range, making it ideal for space-constrained, battery-powered applications. The device features four independent, high-gain, frequency-compensated amplifiers with a gain bandwidth product of 1.3 MHz and a slew rate of 0.4 V/us. An operational amplifier (op amp) is a high-gain voltage amplifier with differential inputs and a single-ended output. It is the fundamental building block of analog signal conditioning, used in filters, comparators, integrators, and many other circuits. The LM324QT belongs to the LM324 family, a classic industry-standard quad op amp known for its low power consumption and wide supply range, which includes the ability to operate from a single supply down to 3V. Key features include a wide gain bandwidth of 1.3 MHz, a large voltage gain of 100 dB, and a very low supply current per amplifier of 375 uA. The input common-mode voltage range includes ground, allowing single-supply operation with ground-referenced inputs. The device also features low input bias current and internal frequency compensation, simplifying design and reducing external component count. The LM324QT uses a bipolar process technology, providing robust performance over a wide temperature range. The QFN package offers excellent thermal performance and a small footprint, making it suitable for compact designs. The device is designed for low-power operation, making it ideal for battery-powered equipment where power efficiency is critical. Typical applications include sensor signal conditioning, active filters, DC gain blocks, and transducer amplifiers. The wide supply voltage range and low power consumption make it suitable for automotive, industrial, and consumer electronics. The QFN package is particularly well-suited for portable devices where board space is at a premium. When designing with the LM324QT, ensure proper decoupling of the power supply pins with a 0.1 uF ceramic capacitor placed close to the device. The input common-mode range includes ground, but for best performance, keep inputs within the specified range. The output can swing close to the rails, but avoid driving loads that require rail-to-rail output swing without proper design considerations.

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LM339AD - Quad Differential Comparator | Texas Instruments
LM339AD

LM339AD - Quad Differential Comparator | Texas Instruments

The Texas Instruments LM339AD is a four-channel general-purpose differential comparator with open-collector outputs, supplied in a 14-pin SOIC package. The device supports a maximum rating of up to 38 V, an input offset voltage of 0.37 mV, input bias current of 3.5 nA, and supply current of 200 μA per comparator. According to the LM339A manufacturer datasheet, differential input voltage can equal the maximum-rated supply voltage of ±38 V, while the common-mode input range includes ground. A voltage comparator is an analog interface that compares two input voltages and changes its output state according to their relationship. The LM339 belongs to the comparator IC hierarchy within interface and signal-conditioning semiconductors. Unlike an operational amplifier used for closed-loop precision amplification, the LM339 provides open-loop decision making with relatively low output saturation voltage. Its four independent channels can monitor multiple thresholds, provide isolated sensing functions, or implement window and overvoltage detection. Key benefits include compatibility with TTL, MOS, and CMOS output systems, a supply-current requirement of 200 μA per comparator, and a response time listed as 1.3 μs in the manufacturer product details. These characteristics make the device appropriate for industrial control, power-supply supervision, sensor conditioning, and discrete logic interfaces. The open-collector outputs require an external pull-up resistor whenever a logic-high output is required. The LM339AD family is designed to operate from a single power supply over a wide voltage range. Its differential input rating of ±38 V and ground-inclusive common-mode capability provide useful margin in systems where the input signal can exceed the local logic supply. The A-grade designation distinguishes this version from the improved B family, whose enhanced specifications and operating current should be reviewed when designing a new design. Typical uses include overvoltage and undervoltage protection, zero-cross detection, temperature or light threshold switching, relay-drive logic, and four-channel sensing in industrial equipment. The 14-pin SOIC package permits compact board layouts and standard surface-mount assembly. For reliable implementation, place bypass capacitors near the supply pins and provide an appropriate pull-up resistor on every open-collector output. Confirm common-mode, differential, and output ratings against the actual signal range. Check input polarity and offset requirements when the decision threshold must remain accurate. This page combines manufacturer specifications, same-package replacement guidance, comparative parameters, and practical application guidance to support component selection and PCB design.

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LM339ADE4 - Quad Differential Comparator | Texas Instruments
LM339ADE4

LM339ADE4 - Quad Differential Comparator | Texas Instruments

Texas Instruments LM339ADE4 is a precision quad differential comparator containing four independent comparator channels, with a typical response time of 300 ns, a 2 V to 36 V supply range, and open-collector outputs in a 14-pin SOIC package. It supports single-supply or dual-supply operation and compares input signals across a common-mode range that includes ground. A differential comparator is an analog integrated circuit that evaluates two input voltages and changes its output state when the difference between them crosses a reference threshold. In the broader electronics hierarchy, the LM339 belongs to the comparator IC family, within linear integrated circuits and signal-conditioning systems. Its four channels allow one device to implement independent threshold detection, window comparison, zero-crossing detection, or level conversion without requiring four separate comparator packages. The principal features of the LM339ADE4 include four open-collector outputs, supply-voltage operation from 2 V to 36 V, and low supply-current drain of 0.8 mA typical. The output structure is compatible with TTL, MOS, and CMOS logic, making the device useful where a comparator must drive a pull-up resistor, relay driver, indicator, or digital logic input. Differential input voltage can reach ±38 V, while the common-mode input range includes ground. Internally, the LM339 uses four similar differential comparator sections operating from a common supply architecture. Because the outputs are open collector, each channel can sink logic-level current while remaining in a high-impedance state when inactive. An external pull-up resistor establishes the high output voltage. This architecture provides simple voltage translation and allows several open-collector outputs to share a bus when only one device is actively pulling the line low. Typical uses include industrial control and sensor interfaces, battery-powered monitoring, motor and actuator threshold detection, window comparators, overvoltage and undervoltage protection, and logic-level translation. The ability to operate from a single supply is particularly useful in portable systems because the input common-mode range includes ground. The 14-pin SOIC package also supports conventional surface-mount PCB assembly. Design the pull-up resistor for the required sink current, output rise time, bus capacitance, and available logic supply. Check input common-mode and absolute-maximum limits during startup because the input pins may briefly exceed the operating supply. Account for response delay when designing pulse-width or overvoltage systems; the typical 300 ns figure is a propagation-delay value rather than a guaranteed maximum. This product record combines the manufacturer’s device information with package, pinout, application, and drop-in replacement guidance. It supports faster design decisions by distinguishing the LM339A electrical architecture from B-version and alternate-family options, while emphasizing where open-collector pull-ups, supply range, and input operating limits require engineering review.

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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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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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