LM239N - Quad Open-Collector Comparator, 14-DIP | Texas Instruments
Référence : LM239N ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $0.49 | $0,49 |
| 10 | $0.49 | $4,90 |
| 100 | $0.49 | $49,00 |
| 500 | $0.49 | $245,00 |
| 1 000 | $0.49 | $490,00 |
LM239N Présentation
A voltage comparator is an analog semiconductor that compares two input voltages and changes its output state when the differential input crosses a threshold. The LM239N belongs to the comparator and linear-IC hierarchy, where its low input offset, low input bias current, and common-mode input capability make it useful for analog sensing rather than precision amplification. Its open-collector outputs require an external pull-up resistor when the output must drive a logic node.
The four independent channels make the device useful for window detection, threshold crossing, battery monitoring, sensor conditioning, and multiple digital control decisions. TI’s verified material describes operation from 2 V to 36 V DC or split supplies for the related LM139/139A family, while the LM239 listing confirms a wide supply-voltage range and low-power operation. Exact LM239N-specific values not present in the supplied data are retained as required data-needed markers rather than inferred.
The open-collector architecture gives the designer control over the pull-up voltage and sink-current budget. A pull-up can be connected to TTL, CMOS, MOS, DTL, or ECL logic as appropriate, but the resistor must satisfy both input-high requirements and the comparator’s output-current limits. This makes the LM239N flexible for mixed-voltage systems where a fixed push-pull output would not be suitable.
Typical implementations include overvoltage detection, undervoltage detection, temperature or sensor threshold switches, relay-control logic, industrial control inputs, and consumer battery monitoring. The 14-pin PDIP package is easy to prototype and inspect, although its through-hole form is larger than surface-mount comparator packages. Designers should account for input common-mode limits, output pull-up placement, input noise, unused-channel configuration, and supply bypass capacitors.
The key design tip is to treat each comparator channel as an analog input node protected from excessive differential voltage, while using the open-collector output only with a suitable pull-up network. This page combines verified manufacturer and distributor information, explicitly identifies unavailable LM239N-specific data, and separates practical selection guidance from sourced specifications.
Alternatives de remplacement direct pour LM239N — 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 LM239N (même facteur de forme et même empreinte) — différant par Package, Comparator Type, Response Time, Number of Channels, Mounting Type.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
LM393N
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Voir la fiche technique →LM393P
✅ Remplacement direct✓ En stock
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Voir la fiche technique →LM393M
✅ Remplacement direct✓ En stock
Contactez-nous pour le prix
Voir la fiche technique →LM393D
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Voir la fiche technique →LM239N Valeurs maximales et caractéristiques électriques
| Comparator Type | Quad differential voltage comparator |
| Number of Channels | 4 independent channels |
| Type de sortie | Open-collector |
| Maximum Offset Voltage | 2 mV maximum |
| Input Bias Current | 25 nA typical |
| Supply Voltage Range | Wide range; related LM139/139A family specifies 2 V to 36 V DC |
| Single-Supply Operation | Supported |
| Split-Supply Operation | Supported |
| Low-Level Sensing | Designed for sensing near ground |
| Logic Compatibility | TTL, DTL, ECL, MOS, and CMOS |
| Typical Application | Level detection, low-level sensing, and memory applications |
| Power Drain | Suitable for battery operation |
| Boîtier | 14-pin PDIP |
| Type de montage | Through-hole |
Guide de configuration des broches du LM239N 14-pin pdip
Configuration des broches du LM239N (boîtier 14-pin pdip). 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 LM239N.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
LM239N convient pour 6 applications: Battery Voltage Monitoring, Overvoltage and Undervoltage Protection, Industrial Sensor Interfacing, Consumer Equipment Logic Control, Automotive Electrical Control, Relay and Solenoid Drive Logic.
Battery Voltage Monitoring
LM239N fits a battery threshold detector because it supports single-supply operation, low-level sensing, and sensing near ground. The verified TI material specifically identifies low-level sensing and battery-operation suitability. Place the battery voltage and a reference on the two comparator inputs, then use the open-collector output with a pull-up to a suitable logic rail. The 2 mV maximum offset specification helps when the switching point is close to the sensed level, but the reference accuracy, input common-mode range, and supply limits still need verification. Add hysteresis when the battery voltage changes slowly around the threshold.
Recommandé
Overvoltage and Undervoltage Protection
LM239N can implement independent overvoltage and undervoltage decisions using separate channels of its quad comparator. Each channel compares a divided supply signal against a reference, while the open-collector outputs can pull up to the system’s protection-logic rail. This arrangement is useful in industrial controls and consumer equipment because the four channels reduce the number of separate comparator packages. The verified TI page describes level detection and low-level sensing as intended uses. The divider resistors, input bias current of 25 nA typical, common-mode limits, and pull-up current must be checked against the actual rail and operating temperature.
Recommandé
Industrial Sensor Interfacing
LM239N is appropriate for converting a slowly changing sensor signal into a digital threshold event. Its low 25 nA typical input bias current helps preserve the voltage of a high-impedance sensor source, while the 2 mV maximum offset specification provides a defined starting point for precision-sensitive applications. Use one input for the sensor and the other for a reference, then add positive feedback for hysteresis when the sensor is noisy. The open-collector output is convenient for driving a pull-up and downstream industrial input, but the exact input common-mode range and output-current limits must be confirmed from the LM239N datasheet.
Recommandé
Consumer Equipment Logic Control
LM239N can provide simple, low-cost threshold decisions in consumer electronics where inputs vary around a logic boundary. The verified TI description identifies TTL, DTL, ECL, MOS, and CMOS compatibility, allowing the open-collector outputs to use a pull-up matched to the receiving logic family. For example, one channel can detect a control-signal threshold and another can supervise a supply or accessory line. Compared with a complex ADC, the LM239N gives a direct binary result with low circuitry complexity. Its useful limitation is that the open-collector output needs a pull-up and cannot directly source a high-level signal.
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Automotive Electrical Control
LM239N is identified in verified ON Semiconductor material for consumer, automotive, and industrial electronic applications, making it relevant to vehicle electrical-control prototypes. Multiple channels can supervise battery, ignition-related, actuator, or accessory thresholds, but automotive production use requires confirmation of the exact manufacturer grade, temperature range, vibration qualification, and AEC-Q100 status. The supplied data does not establish that LM239N is AEC-Q100 qualified, so it should not be assumed qualified. The open-collector interface can simplify connection to a protected logic node when the pull-up and transient-protection network are designed for the vehicle electrical environment.
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Relay and Solenoid Drive Logic
LM239N can supervise a control voltage before enabling a relay, solenoid, or motor-driver input. The comparator output does not directly carry the actuator current; instead, its open-collector state can participate in a driver interface or pull-down network. This separation lets the sensing decision and power-stage drive be designed independently. Use a pull-up appropriate to the driver input and include a flyback path for inductive loads at the actuator stage. The comparator’s threshold accuracy, input filtering, and common-mode range must be verified for the selected 14-pin DIP manufacturer part before connecting it to a safety-sensitive control path.
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Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LM239N — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LM393N | LM339N | LM393P | LM393M | LM393D |
|---|---|---|---|---|---|---|
| Comparator Type | Quad differential voltage comparator | Quad comparator family | Quad comparator family | Quad comparator family | Quad comparator family | Quad comparator family |
| Package | 14-pin PDIP | 14-pin PDIP | 14-pin PDIP | 14-pin PDIP | 14-pin PDIP | 14-pin PDIP |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Number of Channels | 4 independent | 4 | 4 | 4 | 4 | 4 |
Principaux différenciateurs
- Temperature positioning differs from the quoted LM339N comparison (vs LM339N)
- Single-supply level detection is explicitly supported (vs LM393N)
- Logic-family flexibility is explicitly identified (vs LM393P)
Notes de conception
Do not treat an open-collector output as a push-pull logic output. Add a pull-up resistor to the required receiving-logic supply and verify the comparator sink-current limit, logic input current, desired rise time, and available power. The verified TI material identifies compatibility with TTL, DTL, ECL, MOS, and CMOS systems, but the pull-up voltage must be selected for the actual downstream device. A resistor that is too large can cause slow transitions; one that is too small can overload the output or waste power during the low state.
Check the common-mode range before using a sensing signal near ground or near the positive supply rail. LM239N is described as suitable for low-level sensing and sensing near ground, but that capability still depends on the exact supply, temperature, and manufacturer grade. Keep comparator input traces short, keep the reference node away from switching outputs, and place any input filtering close to the pin when the source is high impedance. The verified 25 nA typical input bias current should be included in the error budget for high-source-resistance sensors.
Place supply bypass capacitors near the comparator supply pins and route the ground return directly to the package ground. Keep the pull-up resistor close to the open-collector output to minimize trace capacitance and improve transition speed. In a through-hole prototype, preserve the manufacturer’s 14-pin DIP orientation and verify the exact pin numbering before soldering because the supplied web results do not provide a verified individual pin list. Label the pull-up rail clearly so a later board revision does not accidentally connect the output to an incompatible voltage.
Informations de conformité
The supplied search results identify TI LM239-N and related comparator applications, but do not provide verified LM239N RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. Compliance status remains unknown.