LM339AN - Quad Open-Collector Comparator | Texas Instruments
Référence : LM339AN ✓ ActifLM339AN Présentation
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.
Alternatives de remplacement direct pour LM339AN — 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 LM339AN (même facteur de forme et même empreinte) — différant par Comparator Type, Output Type, Response Time, Differential Input Voltage Range, Input Bias Current.
LM339N
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →LM239AN
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
LM2901AN
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
LM339AN
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →LM339AN
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →LM339NG
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →LM339AN Valeurs maximales et caractéristiques électriques
| Comparator Type | General-purpose differential voltage comparator |
| Number of Comparators | 4 independent channels |
| Supply Voltage Range | 2 V to 36 V |
| Differential Input Voltage Range | -18 V to +18 V |
| Response Time | 1.3 µs |
| Type de sortie | Open-collector |
| Input Offset Voltage | 2 mV maximum for the LM339A family |
| Input Bias Current | 25 nA typical for the LM339 family |
| Common-Mode Input Range | Includes ground |
| Logic Compatibility | TTL, MOS, and CMOS compatible outputs |
| Single-Supply Operation | Supported |
| Split-Supply Operation | Supported |
| Boîtier | 14-pin PDIP |
| Nombre de broches | 14 pins |
| Type de montage | Through-hole |
| Statut RoHS | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | unknown |
Configuration des broches de LM339AN
| Broche 1 | OUT 1 — Open-collector output for comparator channel 1 |
| Broche 2 | -IN 1 — Inverting input for comparator channel 1 |
| Broche 3 | +IN 1 — Non-inverting input for comparator channel 1 |
| Broche 4 | GND — Ground connection |
| Broche 5 | +IN 2 — Non-inverting input for comparator channel 2 |
| Broche 6 | -IN 2 — Inverting input for comparator channel 2 |
| Broche 7 | OUT 2 — Open-collector output for comparator channel 2 |
| Broche 8 | OUT 3 — Open-collector output for comparator channel 3 |
| Broche 9 | -IN 3 — Inverting input for comparator channel 3 |
| Broche 10 | +IN 3 — Non-inverting input for comparator channel 3 |
| Broche 11 | GND — Ground connection |
| Broche 12 | +IN 4 — Non-inverting input for comparator channel 4 |
| Broche 13 | -IN 4 — Inverting input for comparator channel 4 |
| Broche 14 | OUT 4 — Open-collector output for comparator channel 4 |
Applications typiques
LM339AN convient pour 6 applications: Industrial Sensor Threshold Detection, Overvoltage and Undervoltage Protection, Battery Voltage Monitoring, Relay and Lamp Drive Interface, Logic Interface and Signal Conditioning, Window and Level Detection.
Industrial Sensor Threshold Detection
The LM339AN suits industrial sensing because its four channels can compare multiple sensor signals against independent reference thresholds within a 2 V to 36 V supply range. According to the verified manufacturer information, the common-mode input range includes ground, which is useful for 5 V or 12 V sensors whose output approaches zero. Each open-collector output can drive a relay driver, status indicator, or PLC input through a suitable pull-up resistor. The 2 mV maximum input offset for the LM339A family helps reduce threshold error. Because the output is not actively driven high, use a local pull-up and route the switched node away from sensitive analog inputs to minimize coupling.
Recommandé
Overvoltage and Undervoltage Protection
The LM339AN can implement multi-rail protection by assigning separate comparator channels to overvoltage and undervoltage conditions. Its differential input capability of -18 V to +18 V and common-mode range extending to ground make it practical for monitoring supply-derived thresholds in industrial and automotive-style control circuits. The 1.3 µs response time supports timely fault detection, although external filtering may be needed when switching-node transients are present. Open-collector outputs allow several channels to share a fault line when wired-OR behavior is acceptable, and each output can be pulled up to the logic rail used by the controller.
Recommandé
Battery Voltage Monitoring
The LM339AN is appropriate for multi-cell battery supervision because four independent channels can monitor different pack voltages or charge-state thresholds. It operates from 2 V to 36 V and supports split supplies, which allows comparison of battery-derived signals around a ground reference. The 2 mV LM339A-family maximum input offset helps preserve resolution near critical thresholds, while the open-collector outputs can directly drive a low-current status LED, relay driver, or protection latch through an external pull-up. Designers should include series input protection, account for input bias current, and verify that the selected LM339AN temperature grade covers the battery application's worst-case ambient temperature.
Recommandé
Relay and Lamp Drive Interface
The LM339AN can compare control signals and then sink current through an open-collector output to operate a relay driver, lamp, or optocoupler LED. The verified 1.3 µs response time is short enough for many basic threshold-control systems, while the open-collector topology gives the designer freedom to select the pull-up voltage independently of the comparator supply. When driving an inductive relay, add the required flyback protection and keep the high-current switching path away from comparator input traces. Because the output only actively pulls low, a pull-up resistor is mandatory whenever a valid high output is required.
Recommandé
Logic Interface and Signal Conditioning
The LM339AN can convert an analog threshold decision into a pull-up-defined logic signal for TTL, MOS, or CMOS-compatible circuitry. Its common-mode range includes ground, and the four-channel arrangement allows independent comparisons without requiring a separate comparator package for each decision. A pull-up resistor establishes the high output level, while the open-collector transistor provides a controlled low state. Designers should select the resistor to achieve adequate rise time for the connected bus capacitance and should verify that the logic family recognizes the resulting voltage and sink current. Input hysteresis can be added with positive feedback when noisy signals would otherwise cause repeated output transitions.
Recommandé
Window and Level Detection
The LM339AN is well suited to window detection because two comparator channels can establish upper and lower limits around one measured level. If the measured signal is below the lower reference, one channel changes state; if it exceeds the upper reference, the other channel changes state. The 1.3 µs response time supports responsive level indication, and the 2 mV LM339A-family maximum offset helps define a narrow decision window. A fourth channel can monitor another level or provide a combined alarm output. Practical implementations should use hysteresis to prevent chatter near a threshold and should account for input offset, temperature drift, resistor tolerance, and any ground shift between the sensed signal and the reference network.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LM339AN — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LM339N | LM239AN | LM2901AN | LM339AN | LM339AN |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | STMicroelectronics | onsemi |
| Package | 14-pin PDIP | DIP-14 | 14-pin PDIP | 14-pin PDIP | 14-DIP | 14-pin PDIP |
| Comparator Count | 4 | 4 | 4 | 4 | 4 | 4 |
Principaux différenciateurs
- Four independent channels in one package (vs LM339N)
- Directly identified cross-brand ordering option (vs onsemi LM339AN)
- Ground-referenced input support (vs STMicroelectronics LM339AN)
Notes de conception
Do not omit the pull-up resistor on an open-collector output. The LM339AN output actively pulls low but does not source a valid high state. Select the resistor to satisfy the load current and input capacitance, then confirm that its high-state voltage remains compatible with the connected TTL, CMOS, or MOS logic. When several outputs share a pull-up node, ensure that the resulting wired-OR fault behavior is acceptable.
Add hysteresis with positive feedback when the compared signal contains noise or crosses the threshold slowly. A small amount of positive feedback prevents repeated output transitions, but excessive hysteresis changes the actual switching point. Check both the inverting and non-inverting input limits, including the common-mode range that includes ground, and keep the reference divider physically close to the corresponding input pins.
Place the input resistors, reference network, and optional hysteresis feedback close to the LM339AN to minimize trace pickup and ground-offset effects. Route the open-collector output away from sensitive analog inputs, especially when the pull-up node has a fast rise time and drives a cable or relay. Use a common, low-impedance ground return and avoid placing the high-current load return between comparator ground pins.
The LM339AN can operate from 2 V to 36 V, but the external pull-up voltage and the logic-device input limits may impose a narrower range. Confirm that the pull-up rail, input signals, and output sink current are all valid under worst-case conditions. Decouple the supply near the device using the capacitance recommended by the manufacturer datasheet, and account for input bias current when using high-impedance reference networks.
Informations de conformité
The supplied verified extracts do not contain explicit LM339AN RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. Compliance status must be confirmed using the current manufacturer product documentation or declaration.