LM339MX - Quad Open-Collector Comparator | Texas Instruments
N.º de pieza: LM339MX ✓ ActivoLM339MX Descripción general
A voltage comparator is an analog signal-conditioning integrated circuit that compares two input voltages and changes its output state when the non-inverting input exceeds the inverting input. The comparator category belongs to the wider hierarchy of analog IC, signal-conditioning IC, logic-interface IC, and semiconductor. The LM339MX is therefore positioned between precision analog conversion and digital logic systems, converting a small voltage difference into a logic-level transition that can drive digital control, protection, or monitoring circuitry.
The four independent channels make the LM339MX suitable for multi-threshold monitoring without requiring four separate packages. Its open-collector outputs permit wired-AND behavior when multiple channels or external devices pull the same output node low. Each channel also supports a pull-up arrangement rather than driving the output rail directly, allowing interface compatibility with different logic families. The approximately 1.3 µs response time makes the device suitable for general-purpose control loops rather than high-speed edge-detection applications.
The 14-pin SOIC footprint supports compact through-hole-style PCB assembly and is pin-compatible with common LM339-family and general-purpose quad-comparator implementations. Because the outputs are open collector, a pull-up resistor is normally required when driving CMOS or TTL inputs. The four channels share supply and ground pins, so decoupling should be placed close to the package power pins and the ground return should follow a low-impedance path.
Typical uses include overvoltage and undervoltage monitoring, power-supply sequencing, battery threshold detection, window comparators, motor-control interfaces, and industrial control systems. Compared with faster rail-to-rail comparators, the LM339MX emphasizes wide supply operation, multiple logic-output compatibility, and a straightforward open-collector interface rather than low-power or nanopower operation.
For new designs, verify the exact input common-mode range, output-current limits, and switching behavior against the selected manufacturer datasheet because these values were not included in the retrieved source snippets. This page combines verified distributor specifications, package details, drop-in alternatives, and application guidance to support engineering selection.
Alternativas directas para LM339MX — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
LM339MX/NOPB
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LM339AM/NOPB
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LM339ADE4
✅ Sustitución directaConsulte el precio
Ver hoja de datos →LM339MX
✅ Sustitución directaConsulte el precio
Ver hoja de datos →LM339MX
✅ Sustitución directaConsulte el precio
Ver hoja de datos →LM339MX Valores máximos y características eléctricas
| Comparator Type | General Purpose |
| Number of Comparators | 4 |
| Supply Voltage Range | Approximately 36 V total, or approximately ±18 V |
| Single or Dual Supply Operation | Supported |
| Response Time | 1.3 µs |
| Tipo de salida | Open-Collector |
| Output Compatibility | TTL, CMOS, MOS, DTL, and ECL |
| Rango de temperatura de funcionamiento | 0 °C to 70 °C |
| Encapsulado | 14-pin SOIC |
| Tipo de montaje | Surface Mount |
| Número de pines | 14 |
| Channel Independence | 4 independent comparators |
Configuración de pines de LM339MX
| Pin 1 | OUT 1 — Open-collector output of comparator channel 1 |
| Pin 2 | IN- 1 — Inverting input of comparator channel 1 |
| Pin 3 | IN+ 1 — Non-inverting input of comparator channel 1 |
| Pin 4 | GND — Common ground connection |
| Pin 5 | IN+ 2 — Non-inverting input of comparator channel 2 |
| Pin 6 | IN- 2 — Inverting input of comparator channel 2 |
| Pin 7 | OUT 2 — Open-collector output of comparator channel 2 |
| Pin 8 | OUT 3 — Open-collector output of comparator channel 3 |
| Pin 9 | IN- 3 — Inverting input of comparator channel 3 |
| Pin 10 | IN+ 3 — Non-inverting input of comparator channel 3 |
| Pin 11 | VCC — Positive power-supply connection |
| Pin 12 | IN+ 4 — Non-inverting input of comparator channel 4 |
| Pin 13 | IN- 4 — Inverting input of comparator channel 4 |
| Pin 14 | OUT 4 — Open-collector output of comparator channel 4 |
Aplicaciones típicas
LM339MX es adecuado para 6 aplicacións: Power-Supply Overvoltage and Undervoltage Monitoring, Battery Threshold Detection and Charger Control, Industrial Control and Logic Interfacing, Audio and Amplifier Output Monitoring, Motor and Actuator Limit Detection, Temperature, Level, and Sensor Window Monitoring.
Power-Supply Overvoltage and Undervoltage Monitoring
The LM339MX fits rail supervision because four independent channels can watch separate thresholds without consuming four separate packages. Each comparator compares a divided supply voltage against a reference and switches its open-collector output when the threshold is crossed. The verified approximately 36 V total supply capability allows the device to monitor many industrial and laboratory rails, while the 1.3 µs response time is more than adequate for power-fault detection. Pull-up resistors are required on the open-collector outputs. The trade-off is that the 0 °C to 70 °C temperature specification should be checked against enclosure temperature, and exact input common-mode limits must be confirmed before finalizing the divider values.
Recomendado
Battery Threshold Detection and Charger Control
The LM339MX can implement battery pack threshold detection by comparing scaled cell voltages with a reference on several independent channels. Its wide single- or dual-supply operating range, approximately ±18 V, supports industrial and automotive battery monitoring, and the open-collector outputs can pull down a system fault line or charger-enable signal. The 1.3 µs response is short compared with the dynamics of battery-pack charge and discharge. Compared with a dedicated fuel-gauge IC, the LM339MX requires resistor dividers, reference components, and firmware thresholds, but it offers a simpler and more flexible four-channel architecture for custom pack protection.
Recomendado
Industrial Control and Logic Interfacing
The LM339MX is useful when a controller must convert a bipolar analog signal into a logic-compatible decision. Its four independent channels accept positive and negative input conditions within the applicable supply arrangement, and the open-collector outputs support wired-AND behavior with pull-up resistors. The verified compatibility with TTL, CMOS, MOS, DTL, and ECL simplifies interfacing with mixed legacy and modern control boards. The 1.3 µs response is appropriate for limit detection and interlock decisions, while the 14-pin SOIC package keeps the footprint compact. Designers should still verify the actual input common-mode range and output current because those limits were not included in the retrieved source snippets.
Recomendado
Audio and Amplifier Output Monitoring
The LM339MX can monitor amplifier outputs or quiescent-state conditions in audio equipment when protection thresholds are more important than nanosecond-speed detection. Four channels allow simultaneous comparison against level-derived reference signals, while the open-collector outputs can trigger a mute, shutdown, or fault input. The verified 1.3 µs response time is adequate for audio protection events, and the approximately 36 V operating capability exceeds typical low-voltage audio-rail requirements. The open-collector architecture requires correctly sized pull-ups and adequate sink-current margin. For high-precision audio level detection, compare the missing input-offset specification with the application's threshold-error budget before finalizing resistor values.
Recomendado
Motor and Actuator Limit Detection
The LM339MX can compare current-sense, position, or limit-switch signals against independent thresholds to protect a motor or actuator driver. Its four channels reduce component count when several limits must be supervised, and the 1.3 µs response time is short for most electromechanical protection functions. The open-collector output can be wired to a shutdown input or fault indicator through a pull-up. Unlike a dedicated motor-driver protector, the LM339MX leaves threshold selection and filtering to the designer, so differential input filtering may be required to avoid nuisance trips. Confirm exact response-time interpretation, input range, and output-current capability against the purchased manufacturer's data.
Recomendado
Temperature, Level, and Sensor Window Monitoring
The LM339MX fits window-monitoring systems where an analog sensor output must be checked against upper and lower limits. Two channels can implement an upper and lower threshold around a reference, while the remaining channels monitor other sensed quantities such as fan speed, liquid level, or supply margin. The verified open-collector output makes it straightforward to combine several alarm conditions on a wired-AND node, provided each output has a pull-up and the sink-current budget is respected. Its 1.3 µs response exceeds the requirements of most thermal and level sensors. However, sensor offset directly affects trip accuracy, so the unspecified LM339MX input-offset voltage must be reviewed before setting narrow guard bands.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para LM339MX — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | LM339MX/NOPB | LM339AM/NOPB | LM339ADE4 | LM339MX | LM339MX |
|---|---|---|---|---|---|---|
| Package | SOIC-14 | SOIC-14 | SOIC-14 | SOIC-14 | SOIC-14 | SOIC-14 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | onsemi | ROHM Semiconductor |
| Comparator Count | 4 | 4 | 4 | 4 | 4 | 4 |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
Diferenciadores clave
- Four independent threshold channels in one 14-pin package (frente a LM339MX/NOPB)
- Broad supply capability for industrial and battery-related monitoring (frente a LM339MX)
- Logic-family flexibility from open-collector outputs (frente a LM339MX)
Notas de diseño
Place the supply bypass capacitor directly between pin 11 and pin 4, with the ground end returned to the package ground using the shortest practical path. Comparator input traces should be kept away from the output and supply nodes because the open-collector outputs can create transient edges that couple into high-impedance inputs. If any input source has significant source impedance, shorten the traces and use a local ground reference to reduce offset induced by supply and output currents.
An open-collector output does not actively drive a high voltage. Every output node that drives CMOS, TTL, or another digital load requires a pull-up resistor to a suitable positive rail. Select that resistor using the load's input-leakage current, required rise time, cable capacitance, and the comparator's output-sink-current capability. Multiple open-collector outputs may share one node for wired-AND operation, but their individual sink-current ratings and the aggregate pull-up current must remain within system limits.
Do not assume that the visible 36 V or ±18 V supply specification is also the permitted input common-mode range. The retrieved data does not state the common-mode input range, differential input range, input-offset voltage, or absolute-maximum ratings. Verify those limits in the datasheet for the exact manufacturer suffix before scaling input signals. In particular, ensure that resistor-divider outputs remain inside the valid input range at every supply state, including power-up and supply-ramp conditions.
Información de cumplimiento
The supplied web snippets did not explicitly state RoHS, REACH, halogen-free, or conflict-minerals status for the Texas Instruments LM339MX. The part is a commercial-temperature comparator and no AEC-Q100 qualification was identified, but automotive qualification status should not be inferred from the generic family name.