LM239NG - Quad 3-36V Comparator | onsemi | DIP-14
Référence : LM239NG ✓ ActifLM239NG Présentation
A comparator is an analog interface integrated circuit that compares two input voltages and produces a logic-level result indicating their relationship. This makes the comparator a member of the comparator hierarchy within amplifier and interface ICs, where it bridges an analog measurement or threshold at the input with digital control or logic at the output. The LM239 family is intended for level detection, low-level sensing, and memory-related threshold functions.
The LM239NG provides four comparators in one package, reducing board area and simplifying multi-channel sensing designs. Its low typical input bias current of 25 nA helps preserve the accuracy of high-impedance sensing nodes. A typical input offset voltage of 1.3 mV establishes the practical threshold accuracy near zero, while the typical output saturation voltage of 130 mV at 4 mA supports reliable interfacing with digital logic. The stated operating temperature range is -25°C to +85°C.
The open-collector output architecture requires an external pull-up resistor on each channel. This arrangement permits the output voltage to be pulled to the system logic supply rather than being fixed internally, offering flexibility when connecting the device to TTL, CMOS, or MOS logic. Because the output transistor is open, multiple comparators can also share a wired pull-up when their outputs cannot conflict. The design supports both single-supply configurations and split supplies where the input and output reference ranges require additional headroom.
Typical uses include detecting voltage thresholds in industrial control systems, monitoring sensor signals in consumer equipment, checking backup and power rails, and evaluating logic levels in memory circuits. The low input bias current is especially useful when a sensing network uses high source impedance. The 14-pin PDIP format is appropriate for through-hole prototypes, educational platforms, and legacy industrial boards where a surface-mount footprint would prevent direct mechanical compatibility.
Designers should verify input common-mode limits and output pull-up values for the intended supply configuration. Place the device away from high-current switching paths, connect the ground reference to a low-impedance return, and use the datasheet pin description to preserve the correct channel arrangement. The open-collector pins must not be left without a pull-up when the output is expected to change state.
This page combines the LM239NG electrical characteristics, pin assignment, application guidance, and clearly qualified replacement options. It also distinguishes true 14-pin package compatibility from broader functional similarity, helping engineers evaluate replacement decisions before modifying an existing design.
Alternatives de remplacement direct pour LM239NG — 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 LM239NG (même facteur de forme et même empreinte) — différant par Comparator Type, Number of Channels, Supply Voltage Range, Output Type, Logic Compatibility.
LM239N
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →LM339N
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →LM339N/NOPB
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LM239NG Valeurs maximales et caractéristiques électriques
| Comparator Type | Quad general-purpose comparator |
| Supply Voltage Range | 3 V to 36 V |
| Number of Channels | 4 channels |
| Type de sortie | Open collector |
| Logic Compatibility | TTL, CMOS, and MOS |
| Typical Low Output Saturation Voltage | 130 mV at 4 mA |
| Typical Input Bias Current | 25 nA |
| Typical Input Offset Current | ±5 nA |
| Input Offset Voltage | 1.3 mV typical |
| Plage de température de fonctionnement | -25°C to +85°C |
| Boîtier | 14-pin PDIP |
| Type de montage | Through-hole |
| Supply Configuration | Single supply or split supply |
| Primary Application | Level detection, low-level sensing, and memory applications |
| Statut RoHS | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | unknown |
Configuration des broches de LM239NG
| Broche 1 | OUT 1 — Comparator 1 open-collector output |
| Broche 2 | IN 1- — Comparator 1 inverting input |
| Broche 3 | IN 1+ — Comparator 1 non-inverting input |
| Broche 4 | GND — Ground reference |
| Broche 5 | IN 2+ — Comparator 2 non-inverting input |
| Broche 6 | IN 2- — Comparator 2 inverting input |
| Broche 7 | OUT 2 — Comparator 2 open-collector output |
| Broche 8 | OUT 3 — Comparator 3 open-collector output |
| Broche 9 | IN 3- — Comparator 3 inverting input |
| Broche 10 | IN 3+ — Comparator 3 non-inverting input |
| Broche 11 | GND — Ground reference |
| Broche 12 | IN 4+ — Comparator 4 non-inverting input |
| Broche 13 | IN 4- — Comparator 4 inverting input |
| Broche 14 | OUT 4 — Comparator 4 open-collector output |
Applications typiques
LM239NG convient pour 6 applications: Industrial Threshold Detection, Battery and Power-Rail Monitoring, Low-Level Sensor Conditioning, Memory and Logic Level Sensing, Consumer Equipment Level Detection, Automotive and Robust System Interfaces.
Industrial Threshold Detection
The LM239NG fits industrial threshold detection because its four independent channels can monitor several process or control voltages while operating from a 3 V to 36 V supply. The typical 25 nA input bias current reduces loading on high-impedance sensor dividers, and the typical 1.3 mV input offset voltage provides a useful baseline for detecting small voltage changes near zero. Connect each comparator to a pull-up resistor and use the open-collector output to drive an isolated, logic, or alarm input. Because the device is specified from -25°C to +85°C, verify that the surrounding enclosure and operating environment remain within that range.
Recommandé
Battery and Power-Rail Monitoring
LM239NG is appropriate for power-rail supervision because four channels can compare independently generated voltages against reference or divided supply levels. Its broad 3 V to 36 V operating range suits systems above the logic supply level, while the open-collector outputs can pull up to the voltage required by the system alarm logic. The typical 130 mV low output saturation voltage at 4 mA provides a defined sink condition for driving an indicator or digital input. Design the divider values to keep the sensed node within the input common-mode range, and use the Request a Quote form for current sourcing information on the 14-pin PDIP version.
Recommandé
Low-Level Sensor Conditioning
The LM239NG works well in low-level sensor conditioning when the source impedance is high. Its typical 25 nA input bias current minimizes current drawn from the sensing node, and the ±5 nA typical input offset current helps preserve the relationship between the measured voltage and the decision threshold. Place the comparator near the sensor connection to reduce noise pickup, connect the device ground to the sensor return, and keep high-current switching nodes away from the input traces. The open-collector output can be pulled up locally before being routed to a controller, providing a practical way to isolate the analog decision from digital logic.
Recommandé
Memory and Logic Level Sensing
LM239NG supports the memory and logic-level sensing functions identified for the LM239 family by comparing multiple digital or analogized signals against threshold levels. Its open-collector outputs are compatible with TTL, CMOS, and MOS logic interfaces, allowing each output to use the appropriate pull-up voltage. The four channels in one 14-pin PDIP package simplify parallel comparisons while reducing the number of separate comparator packages. For memory-related circuits, verify the data and address source levels, propagation delay requirements, and input logic thresholds. Avoid relying on the comparator output for high-speed data transfer unless the timing behavior has been checked against the actual bus requirements.
Recommandé
Consumer Equipment Level Detection
LM239NG can implement compact level-detection functions in consumer and legacy control equipment where several analog conditions must become logic states. The 14-pin PDIP package fits through-hole control boards, and the four channels support independent decisions without requiring four separate comparator ICs. A typical 1.3 mV input offset voltage is suitable for many threshold applications when resistor tolerances and temperature drift are considered. Use separate pull-up resistors for normal independent outputs, and choose their values to balance power consumption, rise time, and the destination input’s leakage current. The stated -25°C to +85°C range should be checked against the product’s enclosure and internal temperature rise.
Recommandé
Automotive and Robust System Interfaces
LM239NG can be evaluated for robust sensing interfaces that need a wide comparator supply range and flexible output pull-up voltage. The 3 V to 36 V operating range allows the comparator to operate from an elevated system rail while its open-collector outputs connect to the appropriate lower-voltage logic domain. The typical 25 nA input bias current supports high-impedance sensing, while the 14-pin PDIP format is useful in through-hole industrial and automotive controller assemblies. Automotive deployment requires separate qualification review because the device is not identified as AEC-Q100 qualified here. Confirm transient protection, ground-bounce behavior, temperature, and production-program requirements before using it in safety-related electronics.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LM239NG — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LM239N | LM339N | LM339N/NOPB |
|---|---|---|---|---|
| Brand | onsemi | onsemi | Texas Instruments | Texas Instruments |
| Package | 14-PDIP | 14-PDIP | 14-PDIP | 14-PDIP |
Principaux différenciateurs
- Four threshold channels in one through-hole package (vs LM2904P3)
- Wide operating supply range (vs TLV2402ID)
- Low typical input bias current (vs LM339N)
Notes de conception
Fit one pull-up resistor from every open-collector output to the appropriate logic supply. Place each resistor close to its output pin so the trace between the comparator and resistor remains short, reducing propagation delay and susceptibility to capacitive noise coupling. Do not connect two outputs directly together unless the application guarantees that both devices cannot pull the shared node low simultaneously.
Route the two ground pins to a low-impedance ground plane and connect the sensor ground directly to the same reference used by the comparator inputs. Keep switching-regulator traces, high-current return paths, and digital clocks away from the high-impedance input nodes. Short input traces and a compact resistor-divider layout reduce susceptibility to leakage and injected noise, which is important when the comparison threshold is only a few millivolts.
Check that every input voltage remains inside the comparator’s common-mode range at the worst-case supply and temperature. Open-collector outputs do not provide a high level without a pull-up, and the pull-up voltage must be compatible with the receiving TTL, CMOS, or MOS input. Verify the full pin-to-pin function for any replacement rather than relying only on the 14-pin outline.
Informations de conformité
The onsemi LM239 product page identifies the LM239 family but the available material does not state the requested compliance details.