LM2903DRE4 - Dual 2-36V Comparator | Texas Instruments
N.º da peça: LM2903DRE4 ✓ AtivoLM2903DRE4 Visão geral
A voltage comparator is an analog semiconductor that compares two input voltages and changes its output state when one input crosses the other. A dual comparator contains two electrically independent comparator channels in one package. The LM2903 belongs to the voltage comparator hierarchy, where it can be described more specifically as a differential comparator with open-collector outputs. It operates from a single supply or from split supplies, making it suitable for industrial power systems with widely separated ground references.
The principal advantages of the LM2903DRE4 are its broad 2 V to 36 V operating supply range, rail-to-rail input characteristic, low typical supply-current drain of 0.4 mA per comparator, and 300 ns response time. The two open-collector outputs allow the output state to be pulled up to an external voltage and provide wired-AND behavior when several comparators share a pull-up resistor. This output arrangement is useful when interfacing with open-drain logic, relay drivers, or subsequent CMOS and TTL stages.
Each comparator contains independent input and output circuitry. Differential input voltage is evaluated between the inverting and noninverting inputs, and the output transistor is turned off or on according to that relationship and the polarity of the open-collector stage. Because the outputs are open collector, the output voltage depends on the pull-up network rather than the comparator alone. Designers must account for leakage current, pull-up resistance, logic thresholds, and propagation delay when translating a high-impedance output state into a valid digital level.
Typical uses include industrial sensor thresholds, battery and power-supply monitoring, overvoltage detection, motor-control signaling, and general-purpose logic interfacing. A split-supply arrangement can compare bipolar signals around ground, while a single-supply arrangement supports systems whose input common-mode range reaches the lower supply rail. The 8-pin SOIC package also supports conventional surface-mount assembly and easy routing between two comparator channels.
A key design consideration is that open-collector outputs require an external pull-up resistor. Select that resistor so that its maximum current and the output leakage current still produce a valid high level, while keeping rise time consistent with the required system response. The 300 ns propagation delay is important for high-speed threshold decisions, but slower pull-up networks can add additional delay after the comparator changes state.
This page combines manufacturer and distributor information with package guidance, application analysis, cross-brand substitution notes, and engineering-focused design advice to help evaluate the LM2903DRE4 beyond a basic catalog listing.
Alternativas drop-in para LM2903DRE4 — 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 LM2903DRE4 (mesmo formato e footprint) — diferindo em Package, Propagation Delay, Comparator Type, Maximum Supply Voltage.
LM2903VDR2G
✅ Drop-InConsulte o preço
Ver ficha técnica →LM2903DG
✅ Drop-InConsulte o preço
Ver ficha técnica →LM2903DRG4
✅ Drop-InConsulte o preço
Ver ficha técnica →LM2903QDR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LM2903BIDR
✅ Drop-InConsulte o preço
Ver ficha técnica →LM2903DRE4 Classificações máximas e características elétricas
| Comparator Type | Dual differential voltage comparator |
| Number of Channels | 2 channels |
| Tipo de saída | Open-collector |
| Supply Voltage Range | 2 V to 36 V |
| Rail-to-Rail Input | Yes |
| Propagation Delay | 300 ns |
| Supply Current per Comparator | 0.4 mA typical |
| Encapsulamento | 8-pin SOIC, 0.154 inch width and 3.90 mm width |
| Tipo de montagem | Surface mount |
| Output Compatibility | TTL, MOS, and CMOS |
| Single or Dual Supply Operation | Single supply or dual supplies |
Configuração de pinos do LM2903DRE4
| Pino 1 | 1OUT — Open-collector output for comparator channel 1 |
| Pino 2 | 1IN- — Inverting input for comparator channel 1 |
| Pino 3 | 1IN+ — Noninverting input for comparator channel 1 |
| Pino 4 | GND — Ground reference |
| Pino 5 | 2IN+ — Noninverting input for comparator channel 2 |
| Pino 6 | 2IN- — Inverting input for comparator channel 2 |
| Pino 7 | 2OUT — Open-collector output for comparator channel 2 |
| Pino 8 | VCC — Positive supply voltage |
Aplicações típicas
LM2903DRE4 é adequado para 6 aplicaçãos: Industrial Sensor Threshold Detection, Battery and Power-Supply Monitoring, Motor-Control and Relay Interfacing, Embedded Logic Level Translation, Window and Over/Under-Voltage Detection, Portable and Low-Power Sensing.
Industrial Sensor Threshold Detection
The LM2903DRE4 is suited to comparing a sensor-derived voltage with an adjustable reference in industrial monitoring equipment. Its rail-to-rail input characteristic supports comparisons near the supply rails, while the 2 V to 36 V operating range accommodates industrial power systems. Each of the two channels can monitor an independent threshold. The open-collector output can directly pull down a wired signal or drive a pull-up-equipped logic input, but the pull-up network must be chosen to maintain a valid high level while respecting the output-device current limit.
Recomendado
Battery and Power-Supply Monitoring
The LM2903DRE4 can implement overvoltage, undervoltage, or rail-window monitoring in battery-backed and industrial power systems. Its typical supply-current drain of 0.4 mA per comparator is useful when every milliamp affects standby power. The 2 V to 36 V range supports low-voltage detection and higher-voltage supervision. Because the output is open collector, the monitor can assert a shared fault line without driving an active-high signal, although the pull-up resistor contributes additional continuous current.
Recomendado
Motor-Control and Relay Interfacing
The LM2903DRE4 can turn a control-voltage comparison into an open-drain command suitable for downstream relay, driver, or logic circuitry. Its 300 ns propagation delay supports responsive threshold decisions, while the open-collector output permits a system-level wired fault signal. In motor-control systems, an external pull-up and driver stage should provide the required current and isolation. The comparator should be placed where switching-node transients cannot exceed its input and supply limits, and its common-mode range must be checked against the actual motor-node voltage.
Recomendado
Embedded Logic Level Translation
The LM2903DRE4 can translate between a sensed voltage domain and a logic domain by comparing the input against a reference and pulling an open-collector output to the destination logic supply. Its 2 V to 36 V supply range allows the comparator stage to operate across multiple industrial voltage levels, and the outputs are compatible with TTL, MOS, and CMOS when properly pulled up. The design must ensure that the pulled-up output voltage remains within the destination device limits and that the reference can be generated accurately over the required temperature range.
Recomendado
Window and Over/Under-Voltage Detection
Two independent LM2903DRE4 comparator channels can monitor the upper and lower boundaries of a voltage window, reducing the component count compared with two single comparators. The open-collector outputs can be wired together with one pull-up to create an active-low out-of-window indication. Its 2 V to 36 V supply capability suits broad input rails, and its 300 ns response allows prompt transitions. Reference accuracy, input offset, and resistor tolerance ultimately determine the real trip points, so those tolerances should be included in the system error budget.
Recomendado
Portable and Low-Power Sensing
The LM2903DRE4 is useful in portable equipment that compares a sensor, divider, or control signal against a threshold while keeping supply consumption low. Its typical 0.4 mA drain per comparator and 2 V minimum supply support compact battery-powered designs. Rail-to-rail inputs help maximize usable signal range, while the 300 ns propagation delay is more than adequate for many control and wake-up functions. Total power should include the open-collector pull-up current, and unused comparator inputs should be tied to a defined valid potential rather than left floating.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para LM2903DRE4 — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | LM2903VDR2G | LM2903DG | LM2903DRG4 | LM2903QDR | LM2903 |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | 3PEAK |
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Comparator Type | Dual differential voltage comparator | Dual differential comparator | Dual differential comparator | Dual differential comparator | Dual differential comparator | Dual independent comparator |
| Number of Channels | 2 | 2 | 2 | 2 | 2 | 2 |
Principais diferenciais
- Two independent comparator channels in one compact package (vs LM2903VDR2G)
- Wide operating supply range (vs LM2903DG)
- Rail-to-rail input capability (vs 3PEAK LM2903)
- Open-collector system-level flexibility (vs LM2903DRG4)
Notas de projeto
Every open-collector output requires an external pull-up resistor. Choose a resistance that keeps transistor current within its rating and still allows the receiver's high-level threshold to be met after accounting for output leakage. The resistor also creates a RC rise time with input capacitance, so unusually high values can make the apparent response slower than the 300 ns comparator propagation delay.
Place the pull-up resistor close to the open-collector output and receiver to minimize the trace exposed to switching noise. Keep comparator input traces away from power inductors, relay contacts, and motor-node wiring. The differential inputs should follow a compact path, with the threshold reference routed away from noisy digital returns. A solid ground-plane connection and short supply-decoupling path reduce comparison errors near the trip point.
Do not leave unused comparator inputs floating. Tie each unused input to a defined potential within the applicable input range and account for current flowing through any bias network. Also confirm that the input common-mode voltage and differential input voltage remain within the absolute maximum ratings; the rail-to-rail input characteristic does not remove those constraints.
The open-collector stage can radiate short current spikes when the output transistor turns off and the pull-up network charges parasitic capacitance. Keep the loop formed by the output, pull-up resistor, and receiver input as small as practical. If the output drives a long cable or relay coil, add suitable suppression and consider a stronger buffer stage instead of increasing pull-up current indiscriminately.
Informações de conformidade
Exact-ordering-code environmental and automotive qualification documents were not identified. Request the current manufacturer compliance records before production release.
