LM339NE4 - Quad 36V Comparator | Texas Instruments | DIP
Référence : LM339NE4 ✓ ActifLM339NE4 Présentation
An analog comparator is a semiconductor that compares two input voltages and changes its output state when the difference crosses a selected threshold. The LM339 belongs to the comparator hierarchy, where a general-purpose comparator can be used for voltage monitoring, sensing, level translation, and open-loop control. Placing four comparison functions in one integrated circuit reduces component count and simplifies design in equipment with several independent analog thresholds.
The LM339NE4 offers low input offset voltage of 0.37 mV, low input bias current of 3.5 nA, and low supply current of 200 µA per comparator. According to the Texas Instruments datasheet, the device supports input and output logic interfacing with TTL, MOS, and CMOS systems. These characteristics are important when the comparator must detect small input-voltage changes without introducing excessive bias or loading on the signal source.
The open-collector architecture provides flexibility in output pull-up selection and permits wired logic connections when suitable pull-up resistors are installed. However, the output must not be left without an appropriate pull-up because the open-collector transistor remains off when it is not actively sinking current. Rise time therefore depends on the pull-up resistance, total bus capacitance, and the number of attached loads.
Typical uses include industrial control and monitoring, overvoltage and undervoltage detection, sensor-interface thresholds, battery monitoring, panel and instrument threshold circuits, and general digital control. The four channels may monitor several rails or signals independently, while common power and ground connections simplify the implementation of multi-channel systems.
Designers should verify the differential input range, common-mode input range, supply voltage, output pull-up network, and channel-to-channel behavior against the manufacturer datasheet. The broad voltage capability is useful for industrial systems, but the comparator must still be checked for the exact input conditions and output timing required by the application.
This page consolidates electrical characteristics, sourcing guidance, drop-in replacement options, pin information, comparison parameters, and practical PCB design notes into one engineering-focused reference for evaluating the LM339NE4.
Alternatives de remplacement direct pour LM339NE4 — 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 LM339NE4 (même facteur de forme et même empreinte) — différant par Differential Input Voltage Range, Number of Channels, Package.
LM239NE4
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LM2901NE4
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LM339N
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →LM339NE4 Valeurs maximales et caractéristiques électriques
| Comparator Type | Quad differential comparator |
| Number of Channels | 4 channels |
| Supply Voltage Range | 2 V to 36 V |
| Nominal Response Time | 300 ns |
| Input Offset Voltage | 0.37 mV maximum |
| Input Bias Current | 3.5 nA maximum |
| Courant d'alimentation | 200 µA per comparator |
| Maximum Supply Rating | 38 V |
| Differential Input Voltage Range | ±38 V |
| ESD Rating | 2 kV HBM |
| Type de sortie | Open-collector |
| Output Compatibility | TTL, MOS, and CMOS |
| Boîtier | 14-pin PDIP, 0.300 inch, 7.62 mm row spacing |
| Type de montage | Through-hole |
| Statut RoHS | Compliant |
Configuration des broches de LM339NE4
| Broche 1 | OUT1 — Channel 1 open-collector output |
| Broche 2 | IN1- — Channel 1 inverting input |
| Broche 3 | IN1+ — Channel 1 non-inverting input |
| Broche 4 | GND — Ground connection |
| Broche 5 | IN2+ — Channel 2 non-inverting input |
| Broche 6 | IN2- — Channel 2 inverting input |
| Broche 7 | OUT2 — Channel 2 open-collector output |
| Broche 8 | OUT3 — Channel 3 open-collector output |
| Broche 9 | IN3- — Channel 3 inverting input |
| Broche 10 | IN3+ — Channel 3 non-inverting input |
| Broche 11 | V+ — Positive supply input |
| Broche 12 | IN4- — Channel 4 inverting input |
| Broche 13 | IN4+ — Channel 4 non-inverting input |
| Broche 14 | OUT4 — Channel 4 open-collector output |
Applications typiques
LM339NE4 convient pour 6 applications: Industrial Overvoltage and Undervoltage Detection, Battery Pack Cell and Rail Monitoring, Sensor Interface and Limit Detection, Power-Supply Sequencing and Fault Monitoring, Process Control and Automation Logic, LED and Lighting Threshold Control.
Industrial Overvoltage and Undervoltage Detection
The LM339NE4 is well suited to industrial threshold monitoring because it combines four differential comparator channels, a 2 V to 36 V operating range, and an input common-mode range that includes ground. Each channel can compare a scaled sense voltage with a reference and provide an open-collector fault indication to a controller or alarm system. The external pull-up sets the logic-high level and can connect to TTL, MOS, or CMOS-compatible inputs. Design the divider and protection network so the sensed voltage cannot exceed the ±38 V differential-input rating, and account for the 0.37 mV maximum input offset when determining the guaranteed trip threshold.
Recommandé
Battery Pack Cell and Rail Monitoring
The LM339NE4 can monitor several battery-related thresholds within one package. Its four independent channels allow separate comparisons for pack voltage, individual protected rails, charger state, or discharge-limit indications. The 2 V minimum operating supply supports lower-energy systems, while the 36 V maximum operating rating is useful for multi-cell industrial battery packs. Open-collector outputs make it practical to combine status indications through pull-up networks. The design must include divider scaling, input filtering, cell-balancing coordination, and fault-safe defaults so an interrupted sense line cannot falsely indicate a safe condition.
Recommandé
Sensor Interface and Limit Detection
The LM339NE4 works as a low-power discrete signal-conditioning stage for resistive, contact, or analog-derived sensor signals. Its low 3.5 nA maximum input bias current helps reduce loading on high-impedance sensors, while the 0.37 mV maximum offset supports threshold decisions near the reference voltage. The open-collector output can directly pull down a digital input or participate in a wired alarm arrangement. Place the input network close to the device, protect exposed sensor leads from transients, and include hysteresis where the sensor signal can oscillate around the threshold.
Recommandé
Power-Supply Sequencing and Fault Monitoring
Four LM339NE4 channels can monitor multiple rails and create ordered enable, ready, or fault indications for a power-supply system. The device's 2 V to 36 V operating range allows it to monitor low-voltage control rails and higher nominal industrial buses, while open-collector outputs allow several status nodes to share a pull-up arrangement. The 300 ns nominal response time supports faster threshold transitions than many slow monitoring loops. Validate every monitored voltage against both the 2 V to 36 V supply range and the ±38 V differential-input limit, and use external transistor stages when the logic interface cannot sink the required fault current.
Recommandé
Process Control and Automation Logic
The LM339NE4 is appropriate for general-purpose automation logic where several analog levels must become digital control events. Four channels can evaluate temperature, level, pressure, or actuator-position signals against local references, reducing the number of discrete comparator packages needed. The open-collector output is adaptable to industrial logic through a correctly selected pull-up or driver stage. Because the common-mode input range includes ground, low-level sensing is practical, but the engineer must still confirm the maximum common-mode voltage for the exact operating condition. Add hysteresis and noise filtering to prevent repeated transitions around analog thresholds.
Recommandé
LED and Lighting Threshold Control
The LM339NE4 can compare light-dependent sensor outputs or supply-derived voltages to control LED and lighting systems. Its four-channel architecture supports multiple brightness, presence, or fault thresholds, while the open-collector output can drive a logic-level driver rather than the LED current directly. A separate transistor is required when the load current exceeds the comparator output capability or when the LED supply differs from the logic rail. Choose the pull-up for the required switching speed and use hysteresis around illumination thresholds to prevent visible flicker caused by small analog variations.
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Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LM339NE4 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LM239NE4 | LM2901NE4 | LM339N |
|---|---|---|---|---|
| Package | 14-pin PDIP | 14-pin PDIP | 14-pin PDIP | 14-pin PDIP |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | STMicroelectronics |
| Comparator Configuration | Quad differential comparator | Quad differential comparator | Quad differential comparator | Quad differential comparator |
Principaux différenciateurs
- Four comparison channels in one 14-pin PDIP package (vs LM239NE4)
- Low offset and bias for threshold comparison (vs LM2901NE4)
- Broad supply operation with a multi-channel comparator (vs LM339N)
Notes de conception
Every open-collector output requires an external pull-up resistor to a suitable logic rail. Without a pull-up, the output can only pull low and may float during the off state. Select the resistor to balance rise time against sink current, and use the manufacturer output-current limits when calculating the maximum low-level current. If several outputs share a bus, include the aggregate sink current and capacitive loading in the worst-case design.
Place input resistors, reference sources, and optional feedback components close to the associated LM339NE4 pins to minimize pickup and propagation delay. Keep the ground return short and connect it to the analog ground reference used by the threshold sources. Because each channel has independent inputs and an output, route adjacent comparator channels carefully and avoid placing high-current switching paths beside the non-inverting inputs. A ground plane is preferable to a narrow, shared return path.
Add positive feedback or another controlled hysteresis network when the compared signals can cross the threshold slowly. Without hysteresis, noise near the reference can cause repeated output transitions and unnecessary switching in downstream logic. Size the hysteresis loop so it exceeds the comparator's 0.37 mV maximum input offset while remaining compatible with the required threshold accuracy. Validate the complete circuit over the expected input range rather than relying on a nominal offset value.
Keep the supply and all inputs within the ratings stated in the Texas Instruments datasheet, including the 2 V to 36 V operating range, 38 V maximum supply rating, and ±38 V differential-input capability. A supply within limits does not guarantee that an individual input is safe under every fault condition. Add series resistance or clamping where a monitored node could exceed those limits, and account for the 200 µA per-comparator supply-current figure when sizing the supply path.
Informations de conformité
The manufacturer comparison record identifies the LM339NE4 as RoHS compliant. The Texas Instruments LM339 family is described as an active general-purpose comparator product line; no automotive qualification was identified for this ordering code.
