LM339MX/NOPB - 4-Comparator, 1.3 us | Texas Instruments
N.º da peça: LM339MX/NOPB ✓ AtivoLM339MX/NOPB Visão geral
A voltage comparator is an analog integrated circuit that compares two input voltages and produces a digital logic state indicating which input is higher. The LM339 belongs to the comparator hierarchy, where a comparator IC converts an analog decision into a logic-level output. It is used when a system needs threshold detection, overvoltage protection, window comparison, sensor conditioning, or a simple control decision without requiring the gain and feedback behavior of an operational amplifier.
The four internal comparators offer input offset voltage as low as 2 mV maximum for all four channels, a 1.3 us response time, and typical supply current of 800 uA. Open-collector outputs require an external pull-up resistor when driving a logic input. This architecture can provide level translation, wired-AND bus behavior, and collective open-drain signaling, although pull-up selection, output rise time, and bus capacitance must be considered during design.
According to the Texas Instruments LM339 product information, the B version is a drop-in replacement for LM239, LM339, and LM2901, while the A and V versions have different characteristics. The device family supports a common-mode input voltage range that includes ground and a differential input range equal to the maximum-rated supply voltage. Output compatibility with TTL, MOS, and CMOS makes the comparator suitable for mixed-voltage systems, although logic thresholds and supply conditions should be checked against the selected interface.
Typical uses include DC overvoltage and undervoltage detection, battery monitoring, sensor threshold switching, temperature-control loops, window comparators, and industrial control interfaces. The 14-pin SOIC package supports surface-mount assembly and provides separate input, output, and ground connections for each comparator. The open-collector architecture is particularly useful when several detectors must share a wired signal or when the output must interface with a logic voltage different from the comparator supply.
Design with adequate input common-mode range, correct supply polarity, and an appropriate pull-up network. Do not permit comparator inputs to exceed the device rating, and account for output saturation, pull-up resistance, bus loading, and propagation delay in timing-sensitive control paths. The 0 °C to 70 °C temperature range identifies this ordering code for commercial-temperature operation.
This product page combines the manufacturer specifications, package and pin information, sourcing guidance, drop-in replacement analysis, comparison parameters, and practical interface guidance. It is designed to help engineers determine whether the LM339MX/NOPB fits a new design or can replace an existing four-channel comparator without changing the PCB footprint.
Alternativas drop-in para LM339MX/NOPB — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com LM339MX/NOPB (mesmo formato e footprint) — diferindo em Comparator Type, Logic Compatibility, Response Time, Package, Output Type.
LM339D
✅ Drop-InConsulte o preço
Ver ficha técnica →LM339DT
✅ Drop-InConsulte o preço
Ver ficha técnica →LM339ADR2
✅ Drop-InConsulte o preço
Ver ficha técnica →LM339MX/NOPB Classificações máximas e características elétricas
| Comparator Type | General-purpose precision |
| Number of Comparators | 4 channels |
| Response Time | 1.3 us |
| Input Offset Voltage | 2 mV maximum for all four comparators |
| Corrente de alimentação | 800 uA typical |
| Single-Supply Voltage Range | 2 V to 36 V |
| Dual-Supply Voltage Range | -18 V to +18 V |
| Tipo de saída | Open collector |
| Logic Compatibility | CMOS, MOS, TTL, DTL, and ECL |
| Common-Mode Input Range | Includes ground |
| Differential Input Voltage Range | Equal to maximum-rated supply voltage |
| Faixa de temperatura de operação | 0 °C to 70 °C |
| Encapsulamento | 14-pin SOIC (D) |
| Tipo de montagem | Surface mount |
Configuração de pinos do LM339MX/NOPB
| Pino 1 | OUT 1 — Open-collector output for comparator 1 |
| Pino 2 | IN 1- — Inverting input for comparator 1 |
| Pino 3 | IN 1+ — Non-inverting input for comparator 1 |
| Pino 4 | GND — Ground connection |
| Pino 5 | IN 2+ — Non-inverting input for comparator 2 |
| Pino 6 | IN 2- — Inverting input for comparator 2 |
| Pino 7 | OUT 2 — Open-collector output for comparator 2 |
| Pino 8 | OUT 3 — Open-collector output for comparator 3 |
| Pino 9 | IN 3- — Inverting input for comparator 3 |
| Pino 10 | IN 3+ — Non-inverting input for comparator 3 |
| Pino 11 | GND — Ground connection |
| Pino 12 | IN 4+ — Non-inverting input for comparator 4 |
| Pino 13 | IN 4- — Inverting input for comparator 4 |
| Pino 14 | OUT 4 — Open-collector output for comparator 4 |
Aplicações típicas
LM339MX/NOPB é adequado para 6 aplicaçãos: DC Overvoltage Protection, Battery Threshold Monitoring, Industrial Sensor Thresholding, Temperature Control Loops, Window Limit Detection, Wired-AND Fault Reporting.
DC Overvoltage Protection
The LM339MX/NOPB is appropriate for detecting when a supply rail exceeds a defined threshold because each of its four channels can compare a divided feedback voltage with a reference. The 2 mV maximum input offset helps the threshold remain close to the calculated boundary, while the 1.3 us response time supports prompt protection signaling. In a practical implementation, the feedback network scales the monitored voltage, the non-inverting and inverting inputs receive the threshold relationship, and an external pull-up converts the open-collector result to a logic-high fault indication. This arrangement can supervise a 12 V or 24 V industrial rail, although the divider, reference tolerance, and input common-mode limits must be validated across temperature and supply variation.
Recomendado
Battery Threshold Monitoring
The LM339MX/NOPB can monitor a battery or backup rail by comparing scaled voltages against a reference generated from the monitored supply. Its four independent channels provide enough capacity for charge-state, undervoltage, and overvoltage decisions within one 14-pin SOIC. The 2 V minimum single-supply operation suits low-voltage systems, while the 2 mV maximum offset specification supports reasonably precise switching points. Designers should account for battery chemistry, resistor tolerances, input offset over temperature, and the fact that the open-collector output remains undriven until a pull-up resistor is installed. A suitable application uses the comparator as a state detector rather than a precision analog measurement element.
Recomendado
Industrial Sensor Thresholding
The LM339MX/NOPB converts a conditioned analog sensor signal into a logic decision when a threshold is crossed. Its four channels allow several temperature, pressure, or level sensors to be supervised with independent threshold points, and the 1.3 us response time is suitable for many industrial limit-detection functions. A typical circuit places a filtered sensor signal on one input and a resistor-defined reference on the other, then uses an open-collector output with a pull-up to drive a controller input. The common-mode input range includes ground, but every input must remain inside the manufacturer limits. Long cable runs should be filtered or protected before comparison to avoid noise-induced switching and repeated output transitions.
Recomendado
Temperature Control Loops
The LM339MX/NOPB can implement the switching element in a basic temperature-control circuit by comparing a thermistor-derived voltage with a temperature-setpoint voltage. Its four channels can support heating, cooling, alarm, and indicator functions within one package. The 1.3 us response time is more than adequate for typical thermal loops, whose behavior is dominated by sensor and actuator inertia rather than comparator propagation delay. The open-collector output can directly sink current in a relay or transistor driver when the relay current and voltage remain within the output device ratings. For reliable control, verify comparator hysteresis, add pull-up resistors, and use a sensor interface that keeps the compared voltage within the common-mode range.
Recomendado
Window Limit Detection
The LM339MX/NOPB is well suited to window comparison because two channels can establish lower and upper boundaries for the same signal. Each channel compares the monitored voltage with a corresponding reference, and their open-collector outputs can be combined into a fault signal using the wired-AND behavior of open-collector nodes. This arrangement provides a simple out-of-range indication for a supply, temperature, or pressure signal. The 2 mV maximum offset is useful at narrow thresholds, but resistor and reference tolerances can dominate the total error. Use properly sized pull-up resistors, account for bus capacitance, and confirm that the combined fault polarity matches the receiving controller logic.
Recomendado
Wired-AND Fault Reporting
The open-collector outputs of the LM339MX/NOPB allow several comparator channels to share one pulled-up fault bus. Each channel can pull the bus low when its assigned condition is detected, creating a wired-AND indication without requiring an additional logic gate. This arrangement is useful in multi-rail industrial equipment where power-good, overvoltage, and undervoltage events must reach one controller input. The design must include a pull-up resistor sized for the controller's input current and bus capacitance, while the open-collector network provides wired-AND rather than wired-OR behavior. Verify output sink current, logic thresholds, and propagation delay so the receiving system interprets the combined fault correctly.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para LM339MX/NOPB — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | LM339D | LM339DT | LM339ADR |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 14-pin SOIC (D) | 14-pin SOIC (D) | 14-pin SOIC (D) | 14-pin SOIC (D) |
Principais diferenciais
- Four independent comparator channels in a compact surface-mount package (vs LM2903DR)
- Published 1.3 us response time (vs LM339ADR)
- Low offset specification across all four channels (vs LM339DT)
Notas de projeto
Every open-collector output requires an external pull-up resistor. Without a pull-up, the output cannot establish a valid high logic state. Select the pull-up voltage to match the receiving logic family and calculate the resistor from the controller's input current, bus capacitance, and required switching speed. A lower pull-up resistance produces a faster rising edge but increases continuous current when the comparator output is asserted low.
Keep the four comparator inputs, their feedback or threshold components, and the associated ground return close to the SOIC pins to reduce susceptibility to injected noise. Place input-divider and reference-network components near the inputs they serve rather than near an unrelated shared section of the PCB. Ground pins should connect to a low-impedance plane, and long sensor traces should be filtered or protected before reaching the comparison inputs.
Verify both the supply magnitude and input common-mode range under every expected operating condition. The common-mode range includes ground, but that does not permit arbitrary negative or positive input excursions. When monitoring a supply above the comparator's 2 V to 36 V range, use a divider or other scaling network. Also ensure that the external pull-up voltage remains within the logic interface rating and does not exceed the open-collector output node limits.
Do not treat the 1.3 us response time as the complete system decision delay. Threshold dividers, reference tolerances, comparator input offset, pull-up RC time, and the receiving controller's input threshold all contribute to timing and accuracy. For hysteresis-sensitive applications, add positive feedback around the relevant channel and check that the resulting switching band remains within the expected measurement range.
Informações de conformidade
The available component information identifies the family as RoHS-compliant, but suffix-specific compliance declarations for LM339MX/NOPB were not established. AEC-Q100 status is not applicable to the stated 0 °C to 70 °C commercial-temperature ordering code.