LM339DG4 - 4-Channel Open-Collector Comparator | TI
N.º de pieza: LM339DG4 ✓ ActivoLM339DG4 Descripción general
An analog comparator is an integrated circuit that evaluates a differential input and changes its output when the measured relationship crosses a defined threshold. The LM339 belongs to the comparator hierarchy, alongside general-purpose differential comparators and the broader semiconductor category. Four independent channels in one package reduce board area, while the open-collector architecture allows each output to be pulled up to a local supply voltage and used for wired logic, alarm signaling, or transistor-driver interfaces.
The LM339 family supports single-supply or split-supply operation, and its input common-mode range extends close to ground. The low offset voltage helps establish a stable switching threshold, while low input bias current limits disturbance in high-impedance sensing circuits. Its open-collector outputs require an external pull-up resistor and can sink current rather than source a full logic-high voltage. This behavior is useful when driving relays, lamps, or NPN transistors through an appropriate interface stage.
The LM339DG4 is a 14-pin SOIC device intended for the 0 °C to 70 °C commercial temperature range. Its four channels share power pins but retain separate input and output connections. The manufacturer identifies a maximum rating of up to 38 V, an ESD rating of 2 kV HBM, and the B-version family improvements include lower offset, lower supply current, faster response, and improved input ruggedness. These characteristics make the device suitable for general-purpose signal conditioning rather than precision instrumentation.
Typical applications include industrial sensor thresholds, overvoltage and undervoltage detection, temperature-control logic, battery monitoring, window or level comparators, and discrete transistor control. Because the outputs are open collector, the same package can support different logic families by selecting the pull-up voltage appropriately. The device is also useful in educational and prototype circuits where four comparison channels are needed without using four separate packages.
Design the pull-up resistor around the output-sink current, required rise time, and available supply voltage. Keep the comparator inputs away from switching nodes and use a stable reference near the threshold when input offset matters. Verify absolute maximum supply voltage, input common-mode limits, output-current limits, and thermal conditions before applying the part in a new design.
This page combines the device specifications, application guidance, pin assignment, qualification limits, and technically constrained replacement options for engineers evaluating the LM339DG4. It also identifies where a true same-package drop-in substitution should be reviewed rather than treating every similarly named LM339 variant as electrically identical.
Alternativas directas para LM339DG4 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con LM339DG4 (mismo factor de forma y huella) — difiere en Comparator Type, Package, Output Type, Operating Temperature Range, Supply Voltage Range.
LM339DR
✅ Sustitución directaConsulte el precio
Ver hoja de datos →LM339MX
✅ Sustitución directaConsulte el precio
Ver hoja de datos →LM339ADG4
✅ Sustitución directaConsulte el precio
Ver hoja de datos →LM339BDR
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
LM2901BDR
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
LM339DG4 Valores máximos y características eléctricas
| Comparator Type | 4-channel differential comparator |
| Tipo de salida | Open collector |
| Supply Voltage Range | 2 V to 36 V |
| Maximum Rating | Up to 38 V |
| Number of Channels | 4 |
| Input Offset Voltage | 0.37 mV |
| Input Bias Current | 3.5 nA |
| Corriente de alimentación | 200 uA per comparator |
| Response Time | 300 ns |
| ESD Rating | 2 kV HBM |
| Rango de temperatura de funcionamiento | 0 °C to 70 °C |
| Encapsulado | 14-pin SOIC |
| Tipo de montaje | Surface mount |
| Single-Supply Operation | Supported |
| Dual-Supply Operation | Supported |
| Output Pull-Up Requirement | External pull-up resistor required |
| Estado RoHS | unknown |
| REACH Status | unknown |
Configuración de pines de LM339DG4
| Pin 1 | 1OUT — Open-collector output for comparator channel 1 |
| Pin 2 | 1IN- — Inverting input for comparator channel 1 |
| Pin 3 | 1IN+ — Noninverting input for comparator channel 1 |
| Pin 4 | GND — Ground connection |
| Pin 5 | 2IN+ — Noninverting input for comparator channel 2 |
| Pin 6 | 2IN- — Inverting input for comparator channel 2 |
| Pin 7 | 2OUT — Open-collector output for comparator channel 2 |
| Pin 8 | 3OUT — Open-collector output for comparator channel 3 |
| Pin 9 | 3IN- — Inverting input for comparator channel 3 |
| Pin 10 | 3IN+ — Noninverting input for comparator channel 3 |
| Pin 11 | V+ — Positive power supply connection |
| Pin 12 | 4IN+ — Noninverting input for comparator channel 4 |
| Pin 13 | 4IN- — Inverting input for comparator channel 4 |
| Pin 14 | 4OUT — Open-collector output for comparator channel 4 |
Aplicaciones típicas
LM339DG4 es adecuado para 6 aplicacións: Industrial Sensor Threshold Detection, Battery Voltage Monitoring, Overvoltage and Undervoltage Protection, Temperature Control Logic, Relay and Discrete Transistor Control, Window and Level Comparators.
Industrial Sensor Threshold Detection
The LM339DG4 is well suited to comparing a conditioned sensor signal with a reference voltage because each channel provides 0.37 mV input offset and only 3.5 nA input bias current. Four channels can monitor temperature, pressure, level, or current-sensor outputs without requiring four separate comparator packages. Place the reference near the noninverting input and the sensed signal at the inverting input when a fault indication is required. Because the outputs are open collector, pull-up resistors establish the logic-high level and allow several comparator outputs to share a wired node. Keep sensor traces away from switching power nodes and verify the input common-mode limits before operation.
Recomendado
Battery Voltage Monitoring
A quad LM339DG4 can supervise multiple battery or power-rail thresholds when the sensing network keeps every input inside the comparator's common-mode range. Its 2 V to 36 V operating range supports low-voltage cells through higher-voltage industrial systems, while the 300 ns response permits rapid fault signaling. Use precision resistor dividers to scale each monitored node and include hysteresis to prevent repeated switching near the threshold. The open-collector outputs can pull up a fault line or drive an NPN stage, but a pull-up resistor is required on every output. Account for input bias current when selecting high-value dividers, and confirm the absolute maximum rating of up to 38 V against the highest possible transient.
Recomendado
Overvoltage and Undervoltage Protection
The LM339DG4 supports multi-rail protection by using separate comparator channels for overvoltage and undervoltage thresholds. Its low offset voltage helps reduce the transition point error, while the 300 ns response time accelerates fault detection compared with slower monitoring loops. Scale protected rails with resistor dividers, clamp excessive input transients, and place the threshold reference on the low-impedance side of the input network. Because the output is open collector, multiple channels can indicate individual fault conditions through discrete pull-up nodes or a combined wired-alarm arrangement. Validate divider tolerance, input bias error, and comparator hysteresis before relying on the protection threshold for safety-related functions.
Recomendado
Temperature Control Logic
The LM339DG4 can compare a temperature-sensor signal with upper and lower setpoints, providing independent digital indications for heating and cooling demands. Two channels can establish the control band while additional channels monitor related signals. The 0.37 mV offset and 3.5 nA input bias current are useful with high-impedance sensor networks, and the 200 uA per-comparator supply current supports low-power control systems. Place hysteresis resistors around the reference or feedback path to prevent relay or heater chatter. Because each output is open collector, use a pull-up resistor and add an appropriate transistor or driver when switching a heater, fan, or relay rather than loading the comparator output directly.
Recomendado
Relay and Discrete Transistor Control
The open-collector outputs of LM339DG4 are useful when a threshold decision must control an NPN transistor, relay driver, or indicator stage. The comparator pulls the output low only when its input condition is met, and the pull-up resistor sets the maximum logic-high voltage for the attached interface. This permits the pull-up to reference either the comparator supply or a separate compatible logic rail. Add a flyback diode across inductive loads and ensure the driver transistor's base current is compatible with the output sink capability. Keep high-current relay wiring separate from sensitive input traces. The 300 ns response makes the decision stage fast, although relay and mechanical delays will dominate the total switching time.
Recomendado
Window and Level Comparators
A pair of LM339DG4 channels can establish upper and lower limits for a slowly varying level signal, creating a window indication without a microcontroller performing every comparison. The remaining channels can monitor a second level or provide separate alarm outputs. Low input bias current helps preserve the accuracy of high-impedance sensing networks, while the small input offset supports reasonably precise thresholds. Add controlled feedback to create hysteresis and prevent output chatter near either limit. The open-collector architecture supports a pull-up to the system logic voltage and permits wired combinations of alarm states. Verify that the sensor voltage remains within the comparator's input common-mode range throughout the complete measurement span.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para LM339DG4 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | LM339DR | LM339MX | LM339ADG4 | LM339BDR | LM2901BDR |
|---|---|---|---|---|---|---|
| Package | 14-pin SOIC | 14-pin SOIC | 14-pin SOIC | 14-pin SOIC | 14-pin SOIC | 14-pin SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Comparator Count | 4 | 4 | 4 | 4 | 4 | 4 |
Diferenciadores clave
- Four independent comparator channels in one 14-pin SOIC package (frente a LM2904P3)
- Open-collector outputs support flexible pull-up voltage and wired logic (frente a TLV2402ID)
- Low-power general-purpose threshold detection (frente a LM201AD)
Notas de diseño
Each open-collector output requires a pull-up resistor; omitting it leaves the output state undefined during normal operation. Select the resistor using the required output rise time, total output capacitance, available pull-up voltage, and maximum sink current. If multiple LM339DG4 outputs are wired together, ensure that only one output can actively pull the shared node low at a time, because a grounded output can prevent the remaining devices from establishing a valid logic-high state.
Route the four differential input pairs away from relay contacts, switching inductors, high-current transistor emitters, and power-supply switching nodes. Connect the ground reference to a low-impedance return path and place input compensation or filtering components close to the relevant pins. When sensitive high-impedance sensing is involved, keep the divider and feedback components close to the device and avoid long parallel traces that can capacitively inject noise into the threshold inputs.
The recommended operating supply range is 2 V to 36 V, while the family documentation identifies a maximum rating of up to 38 V. Do not treat the 38 V value as an operating target. Decouple the supply pins close to the device with the capacitance recommended by the manufacturer datasheet, and ensure any input or output transient remains within the absolute maximum limits. For single-supply operation, confirm that the measured input signals remain inside the permitted common-mode range.
Add hysteresis wherever the output can influence the compared input, because a small offset and 300 ns response may otherwise produce repeated switching near the threshold. For slow-moving sensor signals, intentional hysteresis normally reduces chatter more effectively than a faster comparator alone. Verify that the feedback network does not add excessive error to the required threshold, and keep pull-up capacitance low when fast output transitions are needed.
Información de cumplimiento
The 0 °C to 70 °C commercial operating range indicates that this is not an AEC-Q100 automotive-qualified grade. RoHS, REACH, lead-free, halogen-free, and conflict-minerals status require confirmation from the manufacturer or current product documentation.