LM2903QDRQ1 - 36V Automotive Dual Comparator | Texas Instruments
N.º de pieza: LM2903QDRQ1 ✓ ActivoLM2903QDRQ1 Descripción general
A differential comparator is an analog integrated circuit that compares the voltage at its inverting input with the voltage at its non-inverting input and changes its output state when the input difference crosses a defined threshold. The comparator belongs to the broader hierarchy of analog ICs, signal-conditioning ICs, and semiconductor devices. Its open-collector architecture allows the output to be pulled up to a system-compatible logic voltage rather than being limited to the IC supply rail.
Key electrical characteristics include a typical input offset voltage of 2 mV, a typical input bias current of 25 nA, and a supply current of 0.4 mA per comparator. Each channel provides one push-pull-compatible input stage and an open-collector output that is compatible with TTL, MOS, and CMOS logic families. The single-supply operating range is 2 V to 36 V, while operation from dual supplies is possible when the total supply difference is between 2 V and 36 V.
The LM2903-Q1 family combines a wide supply range with low supply current and AEC-Q100 Grade 0 and Grade 1 options. These characteristics make it suitable for sensing circuits connected to higher-voltage buses than those commonly handled by low-voltage mixed-signal comparators. The open-collector outputs also simplify wired-interface and level-shifting arrangements when an external pull-up resistor is used.
Typical applications include automotive battery and power-system monitoring, industrial control systems, motor and solenoid feedback circuits, window or lighting controllers, overcurrent and overvoltage detection, and general-purpose threshold sensing. Two channels in one package reduce board area when independent comparison functions are required.
The main design consideration is the open-collector output. Every output requires a pull-up resistor to the desired logic rail, and the pull-up must be sized against the output sink current and expected switching rate. Designers should also verify the input common-mode range at the selected supply voltage before committing the circuit to automotive or industrial rail conditions.
Alternativas directas para LM2903QDRQ1 — 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 LM2903QDRQ1 (mismo factor de forma y huella) — difiere en Comparator Type, Output Type, Automotive Qualification, Operating Temperature Range, Package.
LM2903QDRG4
✅ Sustitución directaConsulte el precio
Ver hoja de datos →LM2903QDRG4Q1
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Ver hoja de datos →LM2903VQDRG4Q1
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Ver hoja de datos →LM2903AVQDRG4Q1
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Ver hoja de datos →LM2903DR
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Ver hoja de datos →LM2904LVQDRQ1
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Ver hoja de datos →LM2903QDRQ1 Valores máximos y características eléctricas
| Comparator Type | Dual differential comparator |
| Number of Channels | 2 |
| Automotive Qualification | AEC-Q100 Grade 0 and Grade 1 |
| Single-Supply Operating Range | 2 V to 36 V |
| Dual-Supply Operating Range | Total supply difference of 2 V to 36 V |
| Corriente de alimentación | 0.4 mA per comparator |
| Input Offset Voltage | 2 mV typical |
| Input Bias Current | 25 nA typical |
| Tipo de salida | Open collector |
| Logic Compatibility | Compatible with TTL, MOS, and CMOS |
| Encapsulado | 8-pin SOIC |
| Tipo de montaje | Surface mount |
Configuración de pines de LM2903QDRQ1
| Pin 1 | OUT1 — Open-collector output of comparator 1 |
| Pin 2 | IN1- — Inverting input of comparator 1 |
| Pin 3 | IN1+ — Non-inverting input of comparator 1 |
| Pin 4 | GND — Ground connection |
| Pin 5 | IN2+ — Non-inverting input of comparator 2 |
| Pin 6 | IN2- — Inverting input of comparator 2 |
| Pin 7 | OUT2 — Open-collector output of comparator 2 |
| Pin 8 | VCC — Positive supply connection |
Aplicaciones típicas
LM2903QDRQ1 es adecuado para 6 aplicacións: Automotive Battery Threshold Monitoring, Industrial Overvoltage and Undervoltage Detection, Motor Drive Current and Feedback Sensing, Solenoid and Relay Drive Protection, Window, Lighting, and Body-Control Threshold Circuits, High-Side Sensor and Bridge Readout Interfacing.
Automotive Battery Threshold Monitoring
The LM2903QDRQ1 fits 12 V, 24 V, and 36 V automotive monitoring because its single-supply range extends to 36 V while each channel draws only 0.4 mA typical supply current. A pair of channels can independently monitor overvoltage and undervoltage conditions, providing complementary open-collector fault signals to a body or powertrain controller. Its 2 mV typical input offset supports reasonably precise threshold decisions, and AEC-Q100 Grade 0 and Grade 1 options address automotive qualification requirements. The input common-mode limit must still be checked against the actual rail voltage before finalizing the divider network.
Industrial Overvoltage and Undervoltage Detection
In industrial power rails, the LM2903QDRQ1 can compare a divided 24 V or 36 V bus against two reference levels using its two differential channels. The 0.4 mA per-comparator supply current limits standing load, while the open-collector outputs can pull up to the voltage of the local supervisor logic instead of requiring a dedicated push-pull driver. With a 2 mV typical input offset, resistor-divider tolerances and reference accuracy will usually dominate the overall trip accuracy. Choose the external pull-up values carefully to balance sink current against output transition speed.
Motor Drive Current and Feedback Sensing
The LM2903QDRQ1 is suitable for detecting motor current, position, or speed feedback when the sensing element produces a differential signal. Its 25 nA typical input bias current reduces loading on high-impedance sensor networks, and the open-collector output can directly support wired logic or a subsequent latch input. Two independent comparators in one 8-pin SOIC can monitor complementary upper and lower limits around a setpoint. Because automotive versions are qualified, the device can be used in vehicle motor-control subsystems when the required AEC-Q100 grade and operating temperature are selected correctly.
Solenoid and Relay Drive Protection
The LM2903QDRQ1 can implement an overcurrent or stall detector ahead of a solenoid, relay, or actuator driver. One channel can monitor the average current while the other checks an instantaneous peak, enabling a fast shutdown signal to the controller. Its 2 V to 36 V supply range permits operation from protected automotive and industrial rails, and the open-collector fault output can be pulled up to a logic rail and ORed with other protection signals. The design should account for output sink current when choosing the pull-up resistor and should verify the input common-mode range during transients.
Window, Lighting, and Body-Control Threshold Circuits
Body-control modules use window-position, lighting, and actuator feedback that must be converted into digital decisions. The LM2903QDRQ1 provides two channels for upper and lower limits of a position or timing signal while consuming only about 0.4 mA per comparator. Open-collector outputs are convenient for driving an open-drain microcontroller input or discrete logic gate, and the wide supply range provides margin when the sensing circuit shares a vehicle rail. Automotive qualification makes the LM2903-Q1 ordering route preferable to the standard version for production vehicle programs.
High-Side Sensor and Bridge Readout Interfacing
The LM2903QDRQ1 can serve as the decision stage for bridge, resistive, or high-impedance sensors where a differential output must be compared with a reference. Its 25 nA typical input bias current limits sensor loading, and the 2 mV typical offset defines the basic comparison accuracy. The wide common-mode capability implied by the 2 V to 36 V supply operation supports many industrial and automotive sensing systems, although the exact allowable input range must be verified from the device data. Two channels allow separate threshold and alarm functions in the same package.
Datos de referencia de ingeniería para LM2903QDRQ1 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | LM2903QDRG4 | LM2903QDRG4Q1 | LM2903VQDRG4Q1 | LM2903AVQDRG4Q1 | LM2903DR | LM2904LVQDRQ1 |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Comparator Configuration | Dual differential comparator | Dual differential comparator | Dual differential comparator | Dual differential comparator | Dual differential comparator | Dual differential comparator | Dual differential comparator |
| Automotive Qualification | AEC-Q100 Grade 0 and Grade 1 | Ordering-specific qualification; official Q1 device is LM2903QDRQ1 | AEC-Q100 ordering configuration | AEC-Q100 ordering configuration | AEC-Q100 ordering configuration | Standard automotive-family ordering route; exact qualification requires order verification | Automotive ordering configuration |
Diferenciadores clave
- Official AEC-Q100 automotive ordering configuration (frente a LM2903QDRG4)
- Wide single-supply range for vehicle and industrial rails (frente a LM2904LVQDRQ1)
- Low supply consumption with two integrated channels (frente a LM2903DR)
- Low-bias differential input stage (frente a LM2903QDRG4)
Notas de diseño
Do not treat the open-collector output as a push-pull logic output. Each output requires a pull-up resistor, and the resistor must connect to the intended logic rail rather than automatically to the comparator supply. Confirm that the output sink-current rating and the pull-up value satisfy both the static current and required output rise time. The pin-description table in the Texas Instruments LM2903-Q1 datasheet should be used to confirm that OUT1, OUT2, IN1-, IN1+, IN2+, IN2-, VCC, and GND are mapped correctly.
Design the input divider so that both input pins remain inside the permitted common-mode range at the minimum and maximum operating supply voltages. Although the comparator supports a 2 V to 36 V supply range, the usable input range is not automatically identical to that range. Use high-value resistors where signal loading permits to reduce power consumption, but check the resulting divider impedance against the 25 nA typical input bias current and the 2 mV typical input offset contribution.
Automotive substitution requires more than an SOIC footprint match. The Texas Instruments support material states that LM2903QDRQ1 is the official AEC-Q100 automotive ordering route and that package materials and assembly sites differ from LM2903QDRG4. Validate the exact ordering code, temperature grade, AEC-Q100 status, production traceability, and change-control requirements before approving an alternative for a vehicle program.
Place the comparator close to the sensed node and reference components so that the differential input pair sees minimal trace area and matched noise pickup. Keep the output pull-up resistor close to the OUT pin to limit parasitic capacitance and ringing on the rising edge. If the output drives a cable or long trace, account for slower rising edges caused by the RC time constant rather than assuming a push-pull transition rate.
Información de cumplimiento
Texas Instruments identifies LM2903-Q1 as AEC-Q100 Grade 0 and Grade 1 qualified for automotive applications. Other environmental compliance declarations require confirmation for the exact ordering code.