LM2903DR2G - Dual 36V Open-Collector Comparator | onsemi
MPN: LM2903DR2G ✓ ActiveLM2903DR2G Overview
A dual comparator is a semiconductor that evaluates two input voltages and changes its output state according to their relationship. The LM2903 belongs to the broader voltage-comparator hierarchy within analog integrated circuits and power-management signal conditioning. Its two independent channels allow simultaneous or separate threshold, window, sensing, and level-detection functions without requiring two separate comparator packages.
Key features include two open-collector channels, a 1.5 µs response time, and low-offset operation with input offset voltage specifications as low as 2.0 mV. The 2 V to 36 V total supply range supports industrial, automotive-style, and embedded applications where the comparator may operate from a single supply or from positive and negative rails. Open-collector outputs permit external pull-up selection and can interface with TTL, MOS, or CMOS-compatible systems when the pull-up voltage and current are appropriate.
The comparator architecture is appropriate when a design needs a digital decision rather than a linear analog output. Each channel can compare a sensed voltage against a reference threshold, while the open-collector structure allows wired logic, alarm signaling, or direct control of a pull-up-equipped input. Operation from single or split supplies expands its usefulness in power systems that use both positive and negative reference rails.
Typical applications include automotive battery and power-rail monitoring, industrial control thresholds, motor and actuator interfaces, sensor conditioning, overvoltage and undervoltage detection, and embedded system supervision. The 8-SOIC package provides a conventional surface-mount footprint, while the dual-channel configuration helps reduce component count in dual-threshold or multi-channel sensing designs.
Designers should verify input common-mode limits, output pull-up values, differential input limits, and the exact electrical grade associated with the selected ordering code. Keep output pull-up paths short, provide adequate return-current routing, and account for the open-collector output’s tendency to sink current rather than source it. The Request a Quote form on this page supports current commercial sourcing questions.
This page organizes the LM2903DR2G electrical characteristics, package information, drop-in candidates, comparison parameters, and practical circuit-placement guidance. It also identifies which ordering variants are technically suitable for footprint reuse and where direct replacement requires additional engineering review.
Drop-in alternatives for LM2903DR2G — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LM2903DR2G (same form factor and footprint) — differing in Output Type, Package, Operating Temperature Range, Comparator Type, Common-Mode Input Range.
LM2903EDR2G
✅ Drop-InContact for price
View Datasheet →LM2903DRG3
✅ Drop-InContact for price
View Datasheet →LM2903DG4
✅ Drop-InContact for price
View Datasheet →LM2903M/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
LM2903M
✅ Drop-InContact for price
View Datasheet →LM2903DR2G Maximum Ratings & Electrical Characteristics
| Comparator Type | Dual differential voltage comparator |
| Number of Channels | 2 channels |
| Channel Independence | 2 independent channels |
| Supply Voltage Range | 2 V to 36 V |
| Split-Supply Operating Range | ±1 V to ±18 V |
| Output Type | Open collector |
| Propagation Delay | 1.5 µs |
| Minimum Input Offset Voltage | 2.0 mV |
| Operating Temperature Range | -40 °C to +105 °C |
| Common-Mode Input Range | Rail-to-rail |
| Package | 8-SOIC |
| Pin Count | 8 pins |
| Mounting Type | Surface mount |
| Logic Compatibility | TTL, MOS, and CMOS compatible |
LM2903DR2G 8-soic Pin Configuration Guide
Pin configuration for LM2903DR2G (8-soic package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for LM2903DR2G.
Refer to the datasheet for full pin configuration.
Typical Applications
LM2903DR2G is suitable for 6 applications: Automotive Battery Monitoring, Industrial Overvoltage Detection, Power-Supply Sequencing, Motor and Actuator Interface, Sensor Signal Conditioning, Embedded System Supervision.
Automotive Battery Monitoring
The LM2903DR2G supports battery and vehicle power-rail supervision because each channel can compare a divided sensing voltage with a reference threshold and operate across a 2 V to 36 V supply range. Its 1.5 µs propagation delay is suitable for ordinary fault-detection thresholds, while the specified -40 °C to +105 °C operating range suits temperature-controlled vehicle electronics. The open-collector output can assert a warning or enable a pull-up-equipped system input. Before deployment, confirm the exact automotive qualification, transient limits, input common-mode range, and ground-reference arrangement for the vehicle platform.
Recommended
Industrial Overvoltage Detection
The two independent LM2903DR2G channels can monitor upper and lower system thresholds when a supply rail is divided to the comparator input range. A 2.0 mV low-offset specification can improve decision accuracy near the threshold, while the 1.5 µs response time is appropriate for many industrial protection functions that do not require sub-microsecond action. Each open-collector output can drive a fault input or relay-control stage through suitable interface circuitry. Validate the resistor-divider ratio, capacitor noise filtering, pull-up voltage, and maximum input voltage before energizing an industrial controller.
Recommended
Power-Supply Sequencing
The LM2903DR2G can compare two divided rail voltages to determine their ordering and provide an open-collector sequencing indication. Its dual-channel construction allows two thresholds to be evaluated independently, reducing the comparator count required for a simple positive or negative rail-control scheme. The 2 V minimum operating supply supports low-voltage systems, while the 36 V maximum provides headroom for higher industrial input rails. Because the outputs are open collector, pull-ups can be referenced to the logic rail used by the sequencer. Confirm startup behavior, input common-mode limits, and fault-state requirements in the final power tree.
Recommended
Motor and Actuator Interface
The LM2903DR2G is suitable for an actuator interface when a control signal must be converted into a hardware decision at a defined threshold. Its two channels can independently supervise command and feedback signals, while the 1.5 µs propagation delay provides a deterministic response suitable for ordinary control loops. Open-collector outputs simplify connection to a gate-driver input or another pulled-up logic node, although external transistor or driver stages may still be required for current. Verify output sink current, common-mode range, isolation strategy, and switching-noise margins before connecting it to motors or solenoids.
Recommended
Sensor Signal Conditioning
A low-offset dual comparator can convert a sensor or divider output into a clean logic decision when the signal remains within the LM2903DR2G input common-mode range. The specified 2.0 mV low offset helps preserve threshold accuracy, and the two independent channels support separate alarm or direction decisions without duplicating the comparator package. The 1.5 µs response is suitable for many environmental, level, and position sensing systems. Add input filtering appropriate to the sensor source, select a resistor divider with adequate scaling, and confirm the open-collector pull-up voltage and load current at the connected logic device.
Recommended
Embedded System Supervision
The LM2903DR2G can supervise an embedded power rail or external signal by comparing the divided voltage against a reference and driving a reset, alarm, or interrupt request. Two independent channels allow one comparator to monitor a power condition while the other checks a second input, reducing board space in compact control systems. Its 8-SOIC package is widely supported by assembly and prototype tooling, and the 2 V to 36 V range accommodates many industrial and automotive supply environments. Confirm the reset timing, output polarity, pull-up arrangement, and absolute maximum differential-input condition in the final design.
Recommended
Recommended Products Summary
Engineering reference data for LM2903DR2G — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM2903EDR2G | LM2903DRG3 | LM2903DG4 | LM2903M/NOPB | LM2903M |
|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | onsemi | onsemi | onsemi | onsemi | Texas Instruments | Texas Instruments |
| Comparator Channels | 2 independent channels | 2 channels | 2 channels | 2 channels | 2 channels | 2 channels |
| Output Type | Open collector | Open collector | Open collector | Open collector | Open collector | Open collector |
| Maximum Supply Voltage | 36 V | 36 V | 36 V | 36 V | 36 V | 36 V |
Key Differentiators
- Combines two independent comparator channels in one 8-SOIC package (vs LM2903M/NOPB)
- Specified low-offset performance supports accurate threshold decisions (vs LM2903EDR2G)
- Wide supply range supports both low-voltage logic and industrial rails (vs LM2903M)
Design Notes
Route the two comparator input nets as short, quiet traces and keep them away from switching-node and high-current return paths. If a resistor divider senses a supply rail, place the divider and its filtering capacitor near the input pin so the sensed node is not exposed to coupled noise. Ground the comparator reference and supply-return pins using a low-impedance path; otherwise output jitter can increase even when the nominal 1.5 µs propagation delay is unchanged.
Choose an external pull-up for each open-collector output based on the driven logic voltage, leakage current, switching speed, and required sink current. The pull-up should not exceed any output-pin voltage limit, and its value must allow the output transistor to sink the combined load current. Confirm the minimum supply voltage of 2 V for the complete sensing and logic circuit, including any pull-up rail, rather than checking only the comparator supply pin.
Do not assume the two channels are internally isolated beyond their independent comparators; shared supply pins, package parasitics, and grounding still couple their behavior. Also avoid applying a differential input that exceeds the device rating, even when both individual inputs remain within the common-mode range. Use the onsemi LM2903 datasheet pin table and absolute-maximum section to establish these limits before finalizing the PCB and component values.
For slow threshold signals, add a small capacitor from each input node to its local reference only after checking the resulting delay and sensitivity to source impedance. Excessive filtering can make two channels respond at different times or alter the effective offset. Keep the divider impedance low enough that input bias current produces less error than the intended threshold margin, while maintaining a source impedance compatible with the comparator's noise and stability characteristics.
Compliance Information
The LM2903 family is identified for consumer, automotive, and industrial applications, but the exact LM2903DR2G RoHS, REACH, lead-free, halogen-free, conflict-minerals, and automotive-qualification status requires confirmation for the selected ordering code.