LM393PE3 - Dual Open-Collector Comparator | Texas Instruments
N.º da peça: LM393PE3 ✓ AtivoLM393PE3 Visão geral
A comparator is an analog integrated circuit that evaluates two input voltages and changes its output state when one input becomes higher than the other. Within the device hierarchy, the LM393 is a dual comparator, a linear integrated circuit, and a signal-conditioning component commonly used ahead of digital control systems. Its open-collector architecture requires an external pull-up resistor, allowing wired logic, level translation, and multiple output devices to share a common signal line.
The LM393 family provides low input offset voltage, low input bias current, low supply current, and fast response time. The manufacturer identifies improved B-version performance, including a 0.37 mV low input offset, 3.5 nA low input bias current, 200 µA supply current per comparator, a 1 µs response time, and an extended temperature range. The LM393PE3 also supports TTL, MOS, and CMOS-compatible output interfacing.
Each comparator section includes a non-inverting input, an inverting input, and an open-collector output. The open-collector transistor can pull its output low but cannot actively drive the node high, so the output voltage is established by the pull-up resistor and supply voltage. Separate inputs allow two thresholds or two sensed quantities to be monitored independently within one package.
Typical uses include DC voltage-window detection, battery monitoring, industrial sensor interfaces, overvoltage and undervoltage protection, digital control thresholds, and open-collector alarm signaling. In these applications, the device converts an analog condition into a logic-compatible event without requiring a separate precision reference or output driver.
A primary design consideration is the open-collector pull-up network. Select a resistor that provides adequate sink current at the device's output-saturation limit while keeping rise time acceptable for the connected load. Also verify input common-mode range, supply voltage, output pull-up voltage, and the required logic thresholds across temperature and supply tolerance.
This product page combines manufacturer specifications, replacement guidance, application analysis, and design-focused comparison information to help engineers evaluate the LM393PE3 for through-hole dual-comparator designs without relying on raw catalog listings alone.
Alternativas drop-in para LM393PE3 — 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 LM393PE3 (mesmo formato e footprint) — diferindo em Package, Comparator Type, RoHS Status, Output Type, Number of Comparators.
LM393P
✅ Drop-InConsulte o preço
Ver ficha técnica →LM393N
✅ Drop-InConsulte o preço
Ver ficha técnica →LM393BP
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LM393BPE3
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
LM293N
✅ Drop-InConsulte o preço
Ver ficha técnica →LM2903N
✅ Drop-InConsulte o preço
Ver ficha técnica →LM393PE3 Classificações máximas e características elétricas
| Comparator Type | Dual differential comparator |
| Number of Channels | 2 channels |
| Supply Voltage Range | 2 V to 36 V |
| Dual-Supply Operating Range | ±1 V to ±18 V |
| Tipo de saída | Open-collector |
| Logic Compatibility | TTL, MOS, and CMOS |
| Input Offset Voltage | 0.37 mV maximum for improved B-version |
| Input Bias Current | 3.5 nA maximum for improved B-version |
| Corrente de alimentação | 200 µA per comparator for improved B-version |
| Response Time | 1 µs for improved B-version |
| ESD Rating | 2 kV HBM for improved B-version |
| Maximum Supply Voltage | 38 V for improved B-version |
| Encapsulamento | 8-PDIP, 0.300 in (7.62 mm) pitch |
| Tipo de montagem | Through-hole |
| Temperatura de operação | 0 °C to 70 °C |
Configuração de pinos do LM393PE3
| Pino 1 | OUT1 — Comparator 1 open-collector output |
| Pino 2 | IN1- — Comparator 1 inverting input |
| Pino 3 | IN1+ — Comparator 1 non-inverting input |
| Pino 4 | GND — Ground reference |
| Pino 5 | IN2+ — Comparator 2 non-inverting input |
| Pino 6 | IN2- — Comparator 2 inverting input |
| Pino 7 | OUT2 — Comparator 2 open-collector output |
| Pino 8 | VCC — Positive supply input |
Aplicações típicas
LM393PE3 é adequado para 6 aplicaçãos: DC Voltage-Window Monitoring, Battery Voltage Protection, Industrial Sensor Interfacing, Overvoltage and Undervoltage Protection, Open-Collector Alarm and Status Lines, Precision Control-Line Conditioning.
DC Voltage-Window Monitoring
The LM393PE3 is well suited to detecting whether a DC rail remains inside a permitted upper and lower threshold. Two comparator channels can monitor opposite sides of the voltage window, using the 2 V to 36 V supply capability for many industrial and embedded supplies. Each open-collector output can assert an alarm through a pull-up while presenting a low impedance in the fault state. The low 0.37 mV B-version input offset improves threshold accuracy, although the actual error also includes reference tolerance, input bias current, and resistor mismatch.
Recomendado
Battery Voltage Protection
LM393PE3 channels can compare a divided battery voltage with fixed thresholds to identify overvoltage, undervoltage, or an out-of-range discharge event. The comparator's 2 V to 36 V supply range allows operation from common battery-derived rails when voltage levels are appropriately scaled. An open-collector output can drive a shutdown input, status indicator, or external load switch without adding a separate logic inverter. Designers should account for battery chemistry, tolerance, transient excursions, and the temperature-dependent behavior of the divider.
Recomendado
Industrial Sensor Interfacing
The dual-channel LM393PE3 can convert thermistor, potentiometer, or resistive-sensor outputs into threshold events for a controller. One channel may implement an upper limit while the other implements a lower limit, providing a complete alarm band from one package. The fast 1 µs improved B-version response supports low-latency switching, while the open-collector outputs can directly pull up or down an isolated alert line through a resistor. Calibration must include sensor tolerance, ADC resolution, input offset, and any required hysteresis to prevent chatter.
Recomendado
Overvoltage and Undervoltage Protection
LM393PE3 is useful in power-system protection because two independent channels can monitor positive and negative threshold conditions. The open-collector architecture allows both outputs to drive a common pull-up rail or separate control inputs when fault signaling must remain fail-safe. A 36 V supply rating accommodates many 24 V industrial systems, subject to transient protection requirements. Add input filtering and surge protection where inductive loads or long wiring could create spikes above the device's absolute maximum rating.
Recomendado
Open-Collector Alarm and Status Lines
The LM393PE3 can implement wired alarm lines because each open-collector output can pull a shared bus low while the pull-up resistor establishes the high state. This supports multiple devices on one alert conductor and avoids active contention. TTL, MOS, and CMOS compatibility broadens its use with digital controllers and mixed-signal equipment. The pull-up voltage should remain within the receiving device's input range, and the sink-current budget should include every attached output, pull-up current, and leakage path.
Recomendado
Precision Control-Line Conditioning
A differential signal near an analog control threshold can be converted into a logic event by the LM393PE3, simplifying the interface between analog and digital sections of an embedded controller. The 0.37 mV input-offset rating and 3.5 nA bias-current rating improve margin when the source impedance is high. Adding positive feedback creates hysteresis and prevents repeated output transitions near the threshold. Select resistor values carefully because the feedback network interacts with source impedance and can shift the effective switching threshold.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para LM393PE3 — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | LM393P | LM393N | LM393BP | LM393BPE3 | LM293N | LM2903N |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | STMicroelectronics | STMicroelectronics |
| Package | 8-PDIP, 0.300 in (7.62 mm) pitch | 8-PDIP, same footprint | 8-PDIP, same footprint | 8-PDIP, same footprint | 8-PDIP, same footprint | 8-DIP, same footprint | 8-DIP, same footprint |
| Comparator Channels | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Output Type | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector |
Principais diferenciais
- Original LM393 orderable option with established 8-PDIP compatibility (vs LM393BP)
- Dual threshold monitoring in one through-hole package (vs LM293N)
- Improved response and input characteristics within the same family (vs LM393P)
Notas de projeto
Route the open-collector output and its pull-up resistor close to the receiving logic input to minimize susceptibility to capacitive noise and long traces. Place the pull-up close to the driver when the output is a wired bus, but keep the node compact to limit the effective capacitance seen by every attached device. Confirm that the ground return for the comparator, divider network, and pull-up shares a low-impedance path to the system ground.
Add positive feedback when the comparator can cross its threshold slowly or when noise near the switching point could cause repeated output transitions. The feedback resistor sets the hysteresis band and must be calculated together with the input resistor network because it changes the effective threshold. Also account for common-mode range, input bias current, and source impedance, since these effects can shift the actual switching point away from the nominal divider voltage.
Do not treat an open-collector output as a push-pull logic output: without a pull-up resistor, the output cannot actively reach a valid high level. The resistor must support the required high-state voltage while allowing the comparator to sink the pull-up current and any attached wired-device current. Check the absolute maximum supply rating of 38 V for the improved family and provide transient suppression when the monitored line can experience automotive, industrial, or inductive surges.
Power both comparator channels from the same regulated supply unless the selected operating mode and datasheet limits explicitly support dual-supply operation. Bypass the supply pin with a local high-frequency capacitor and place it near the device ground reference. The improved B-version uses 200 µA per comparator, but total system current still depends on input bias paths, pull-up resistors, and the selected device's temperature-grade suffix.
Informações de conformidade
The manufacturer product and datasheet information used for this page does not provide explicit declarations for these compliance fields.
