LM339J - Quad Open-Collector Comparator | Texas Instruments
Référence : LM339J ✓ ActifLM339J Présentation
A comparator is an analog signal-conditioning IC that compares two input voltages and changes its output state according to their relationship. Unlike a logic gate, a comparator is intended for decision-making near analog operating points. The LM339J combines four comparator channels in one 14-pin through-hole package, making it useful where multiple threshold decisions are required but board area and component count must remain controlled.
The open-collector output is the central feature of the LM339J. Each output can source current when the comparator output is high and must be pulled up with an external resistor to the appropriate logic supply. This architecture permits wired logic, interface to TTL, MOS, or CMOS circuitry, and light-driven or relay-driving arrangements. Open-collector outputs can also be paralleled when the application requires a common output node.
The verified product information identifies the LM339J as a standard, general-purpose comparator and describes it as a low-power, low-offset device. The exact input-offset voltage, input-bias current, response time, and channel-to-channel behavior for the original LM339J were not included in the supplied source data, so those values should be confirmed in the manufacturer datasheet before precision timing or sensing designs are released. The newer LM339B family has different stated specifications and should not be assumed identical to the original LM339J.
Typical uses include industrial control and monitoring, automatic test equipment, power-supply sequencing, battery threshold detection, motor or actuator control, sensor conditioning, and general-purpose digital interface circuits. The 14-CDIP package is especially useful for legacy industrial equipment, educational systems, through-hole prototypes, and assemblies where a socketed or leaded comparator is preferred over a surface-mount package.
Designers should verify input common-mode limits, differential input limits, output pull-up voltage, output sink current, supply current, and input behavior around ground before implementation. A pull-up resistor must always connect each open-collector output to a suitable positive supply. Because the open-collector transistor can pull the node low but cannot actively drive it high, supply sequencing and unused-input states require deliberate design.
This page combines verified distributor pricing, package information, technical search results, and engineer-focused design guidance. It also distinguishes the original LM339J from newer LM339B variants and clearly identifies where package, electrical, or lifecycle information still requires manufacturer-document confirmation.
Alternatives de remplacement direct pour LM339J — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec LM339J (même facteur de forme et même empreinte) — différant par Package, Comparator Type, Output Type, Number of Channels, Supply Voltage Range.
LM339N
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →LM2901J
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LM239J
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →LP339N
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LM339N
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →LM339J Valeurs maximales et caractéristiques électriques
| Comparator Type | Quad differential comparator |
| Number of Channels | 4 channels |
| Type de sortie | Open collector |
| Boîtier | 14-CDIP, 0.300 inch (7.62 mm) |
| Type de montage | Through-hole |
| Minimum Dual Supply Voltage | ±1 V |
| Maximum Dual Supply Voltage | ±18 V |
| Typical Dual Supply Voltages | ±3 V, ±5 V, ±9 V, ±12 V, or ±15 V |
| Maximum Power Dissipation | 1190 mW |
| Comparator Class | Standard general purpose |
| Logic Compatibility | TTL, MOS, and CMOS compatible outputs |
Guide de configuration des broches du LM339J 14-cdip, 0.300 inch (7.62 mm)
Configuration des broches du LM339J (boîtier 14-cdip, 0.300 inch (7.62 mm)). Ce composant analogique comporte des broches d'entrée, de sortie et d'alimentation. Consultez la fiche technique du fabricant pour les configurations des broches d'annulation d'offset, de compensation et d'activation. Idéal pour le conditionnement de signaux et les circuits amplificateurs.
Aucune donnée de brochage détaillée disponible pour LM339J.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
LM339J convient pour 6 applications: Industrial Threshold Control, Power-Supply Sequencing, Automatic Test Equipment, Motor and Actuator Control, Sensor Signal Conditioning, Legacy TTL Logic Interface.
Industrial Threshold Control
The LM339J fits industrial threshold-control boards that compare several sensor or process signals against adjustable reference levels. Its four differential comparator channels provide independent decisions in one 14-CDIP package, reducing the number of separate ICs and simplifying legacy through-hole assembly. The verified LM339 dual-supply range of ±1 V to ±18 V supports split rails commonly found in control cabinets. Because every output is open collector, an external pull-up can establish the voltage required by PLC input, relay logic, or TTL circuitry. Engineers must confirm the original LM339J common-mode range at the actual signal levels and calculate pull-up resistor dissipation before release.
Recommandé
Power-Supply Sequencing
The LM339J can supervise several supply rails in a power-supply sequencing or power-good circuit because four comparison channels fit into a single 14-pin package. Each channel can evaluate a divided supply voltage against a reference and control an open-collector status node, allowing external logic, an enable circuit, or a relay driver to respond to rail conditions. The verified maximum dual-supply magnitude of ±18 V supports monitoring of split rails, while the maximum power dissipation of 1190 mW must be considered in through-hole thermal calculations. The external pull-up voltage should remain within the output-interface requirements, and input thresholds must remain inside the datasheet common-mode limits.
Recommandé
Automatic Test Equipment
The LM339J is appropriate for legacy automatic test equipment that performs several go/no-go limit checks against DUT signals. Four independent comparator channels allow the fixture logic to evaluate upper and lower limits, classify a measurement, or create a window decision. Its through-hole 14-CDIP package is convenient for socketed cards, educational instruments, and low-volume laboratory systems, while open-collector outputs can pull up to the TTL or CMOS interface used by the tester. Precision depends on the actual LM339J offset and bias specifications, which were not present in the supplied excerpts, so designers should confirm them before calculating narrow test limits.
Recommandé
Motor and Actuator Control
The LM339J can implement motor-control and actuator-protection decisions by comparing feedback voltages with reference levels. Four channels can supervise position, speed, current-sense, or limit conditions, and their open-collector outputs can operate compatible driver interfaces after suitable pull-up and drive-stage design. The verified dual-rail operation range of ±1 V to ±18 V is useful where motor-control electronics use positive and negative analog rails. However, an open-collector output is not a high-current motor driver; relay, transistor, or MOSFET amplification is normally required. Confirming output sink current, input common-mode limits, and thermal rise is essential before connecting the LM339J to an actuator circuit.
Recommandé
Sensor Signal Conditioning
The LM339J is suitable for conditioning sensor outputs where a simple threshold decision is preferable to a full analog-to-digital conversion. A resistive divider can translate a sensor signal into the comparator input range, while the differential input compares that value against a reference. Four channels allow multiple sensor outputs to be evaluated efficiently, and the open-collector output can trigger a digital input, indicator, or driver stage. The LM339J's verified ±1 V to ±18 V dual-supply range accommodates many legacy analog systems. Before implementation, engineers should verify the input offset, bias current, common-mode limits, and response time for the original LM339J because those figures were not supplied in the verified excerpts.
Recommandé
Legacy TTL Logic Interface
The LM339J can interface analog decisions to legacy TTL logic through its open-collector outputs and external pull-up resistors. The Texas Instruments product information identifies the family outputs as compatible with TTL, MOS, and CMOS logic, making the device useful in older control panels, test fixtures, and educational equipment. A pull-up resistor connected to the desired logic rail converts the output transistor's low-state behavior into a valid high level. Because the output stage does not actively source current, the resistor value must balance sink-current demand, rise time, and power dissipation. The exact LM339J output-current and logic-level specifications should be checked in the manufacturer datasheet before setting system-wide interface limits.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LM339J — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LM339N | LM2901J | LM239J | LP339N | LM339N |
|---|---|---|---|---|---|---|
| Package | 14-CDIP (0.300 inch, 7.62 mm) | 14-CDIP (0.300 inch, 7.62 mm) | 14-CDIP (0.300 inch, 7.62 mm) | 14-CDIP (0.300 inch, 7.62 mm) | 14-DIP | 14-DIP |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | onsemi |
| Comparator Configuration | Quad differential comparator | Quad differential comparator | Quad differential comparator | Quad differential comparator | Quad differential comparator | Quad differential comparator |
| Output Type | Open collector | Open collector | Open collector | Open collector | Open collector | Open collector |
Principaux différenciateurs
- Military-temperature ordering option (vs LM339N)
- Dual-supply operation (vs LM2901J)
- Established 14-CDIP footprint (vs LM339N)
Notes de conception
Do not treat the open-collector output as a push-pull logic output. Each output requires a pull-up resistor to a compatible positive rail; without it, the node floats and the following logic may interpret the state incorrectly. Calculate the resistor using the required sink current and desired rise time, and verify that the pull-up rail remains within the device's output and absolute-maximum limits.
The verified LM339J maximum power dissipation is 1190 mW, but that rating does not guarantee safe operation at every ambient temperature or PCB condition. Check the complete dissipation equation against the worst-case supply voltage, output-low state, and ambient temperature. The 14-CDIP package can dissipate heat through its leads, so preserve airflow and avoid placing heat-generating parts directly against the device.
Place the pull-up resistor close to the corresponding LM339J output so that the logic node has a short, low-inductance path. Keep comparator input traces away from relay-coil, motor, and switching-node wiring. For sensitive threshold measurements, use a quiet reference source and guard or shield the input routing as appropriate, because the original LM339J offset and bias figures must be verified before selecting very narrow margins.
Informations de conformité
The supplied verified excerpts did not contain document-level RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations for LM339J. These fields remain unknown rather than being inferred from the manufacturer or package.
