LM2903BIDR - Dual 36V Open-Collector Comparator | Texas Instruments
MPN: LM2903BIDR ✓ Active| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
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| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
LM2903BIDR Overview
A comparator is an analog integrated circuit that determines whether one input voltage is above or below another and switches its output when the differential input crosses a threshold. In the broader semiconductor hierarchy, a comparator belongs to the amplifier and comparator IC family rather than an operational amplifier. Open-collector outputs are useful when multiple devices must share a wired bus or when an external pull-up resistor selects the logic voltage independently of the comparator supply.
The LM2903BIDR supports single- or dual-supply operation, allowing its input and output signals to be referenced around ground in control, sensing, and protection circuits. Its industrial temperature range makes it suitable for equipment operating beyond consumer-temperature limits. The two channels are independent, so one device can perform two threshold functions while sharing a package, although output pull-up components and supply decoupling remain external.
Verified distributor and manufacturer results identify the device as a standard, general-purpose, rail-to-rail-input comparator with open-collector outputs and an 8-SOIC footprint. Texas Instruments describes the B-version as a next-generation member of the LM393 and LM2903 families, emphasizing lower offset, lower bias current, lower supply current, faster response, wider supply capability, and improved ESD robustness.
Typical applications include DC overvoltage monitoring, industrial sensor thresholds, battery-powered indication, window comparators, and relay or alarm activation. Because an open-collector output does not actively drive a high voltage, every application must provide a suitable pull-up resistor and account for its sink-current limit. The collector voltage and supply limits should be checked against the manufacturer datasheet before designing to absolute maximum conditions.
For PCB design, place input resistors close to the relevant pins, decouple the supply close to the device, and route high-impedance input traces away from switching nodes. Where open-collector outputs drive cables or long PCB traces, use a strong pull-up and consider a buffer if additional noise immunity or edge control is required. This page combines verified manufacturer and distributor details with engineering guidance for selecting, sourcing, and replacing the component.
Drop-in alternatives for LM2903BIDR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LM2903BIDR
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View Datasheet →BA2903F-E2
✅ Drop-In📋 Reference alternative (not in catalog)
LM2903DT
✅ Drop-In📋 Reference alternative (not in catalog)
LM2903A
✅ Drop-In📋 Reference alternative (not in catalog)
LM2903BIDR Maximum Ratings & Electrical Characteristics
| Comparator Type | Dual differential comparator |
| Number of Channels | 2 channels |
| Output Type | Open-collector |
| Maximum Supply Voltage | 36 V |
| Minimum Supply Voltage | 2 V |
| Input Offset Voltage | 0.37 mV |
| Input Bias Current | 3.5 nA |
| Supply Current | 200 µA per comparator |
| Propagation Delay | 1 µs |
| ESD Rating | 2 kV HBM |
| Operating Temperature Range | -40 °C to +125 °C |
| Industrial Grade | Yes |
| Input Common-Mode Range | Includes ground; rail-to-rail input per distributor listing |
| Package | 8-pin SOIC (D) |
| Mounting Type | Surface mount |
| Supplier Packaging | Tape and reel |
LM2903BIDR 8-pin soic (d) Pin Configuration Guide
Pin configuration for LM2903BIDR (8-pin soic (d) 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 LM2903BIDR.
Refer to the datasheet for full pin configuration.
Typical Applications
LM2903BIDR is suitable for 6 applications: Industrial Overvoltage Monitor, Battery-Powered Sensor Interface, Motor and Solenoid Drive Protection, Battery Charger Status Detection, Window Comparator and Alarm, Process Control Relay Interface.
Industrial Overvoltage Monitor
The LM2903BIDR fits industrial threshold supervision because it provides two independent differential channels, a 36 V maximum supply rating, and an operating range of -40 °C to +125 °C. Place one channel across a precision divider to detect an overvoltage condition, then use its open-collector output to pull an alarm or interlock line low. The 1 µs response can react quickly to transients, while the 0.37 mV specified input offset helps limit comparator error near the threshold. Because the output is open collector, select the pull-up voltage independently and verify its sink-current capability against the alarm and pull-up current.
Recommended
Battery-Powered Sensor Interface
LM2903BIDR is suitable for battery-powered sensing because its 2 V minimum supply and 200 µA per-comparator supply current support low-voltage operation. The 3.5 nA input bias specification reduces disturbance to high-impedance sensor nodes, while the open-collector output can alert a low-power controller without actively driving a supply rail. Connect the sensor or divider to one input, a stable threshold reference to the other, and a local pull-up to the controller logic. Include the pull-up’s continuous current, reference current, input leakage, and any indicator load in the complete power budget.
Recommended
Motor and Solenoid Drive Protection
The LM2903BIDR can supervise a motor, solenoid, or actuator by comparing a scaled feedback voltage with a limit and driving an open-collector shutdown request. Its -40 °C to +125 °C industrial range is useful in equipment exposed to temperature variation, and the 1 µs response supports prompt detection of excursions. The transistor sink must not exceed the comparator’s output limits when pulling down the controller or gate-driver input. Add hysteresis around the threshold to prevent chatter, protect inputs from switching-node transients, and keep the feedback divider physically separated from motor power paths.
Recommended
Battery Charger Status Detection
The LM2903BIDR can generate charge-complete, undervoltage, or overvoltage status by comparing battery-derived feedback with a reference. Two channels support independent checks, while the open-collector outputs can provide active-low flags to a charger controller or host interface. The 200 µA per-comparator supply current is useful in portable systems, but the complete circuit must account for divider current and logic pull-ups. Choose resistor values for low reference-node impedance, add hysteresis if the battery chemistry creates a slowly changing terminal voltage, and confirm that the pulled-up logic level remains compatible with every connected device.
Recommended
Window Comparator and Alarm
LM2903BIDR supports a two-channel window arrangement in which each comparator detects one limit of an acceptable input range. Their open-collector outputs can share a wired-AND alarm bus because each node only pulls low, provided every pull-up and device is rated for the common voltage. This arrangement is useful in instrumentation, rack equipment, and industrial controls where a single fault signal must indicate either undervoltage or overvoltage. Verify propagation-delay differences, input offset, output sink current, and logic thresholds if the system requires a precise fault indication; otherwise, account for the 1 µs response when setting debounce timing.
Recommended
Process Control Relay Interface
The LM2903BIDR can turn a process measurement into an active-low relay-control request when its differential input crosses a preset threshold. The open-collector output is valuable because the pull-up voltage can match an isolated interface or logic domain independently of the analog supply. Industrial temperature operation supports use in factory equipment, while the dual-channel package can monitor two related limits. Keep the pull-up close to the device, choose interface logic that tolerates the collector voltage, and ensure the output sink current includes the relay-driver input and pull-up current. Relay contact transients must be suppressed separately from the comparator’s ESD rating.
Recommended
Engineering reference data for LM2903BIDR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM2903BIPWR | LM2903BIDR | BA2903F-E2 | LM2903DT | LM2903A |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | ROHM Semiconductor | STMicroelectronics | 3PEAK |
| Comparator Configuration | Dual differential comparator | Dual comparator | Dual differential comparator | Dual comparator | Dual comparator | Dual comparator |
Key Differentiators
- B-version precision and response (vs LM2903DT)
- Higher verified maximum supply rating (vs LM2903DT)
- Documented pin-for-pin replacement path (vs BA2903F-E2)
Design Notes
Do not treat a matching 8-SOIC outline as sufficient proof of interchangeability. Verify the manufacturer pin diagram, exposed functionality, output polarity, supply limits, common-mode range, and sink-current rating before substitution. The supplied evidence specifically reports BA2903F-E2 as pin-for-pin with LM2903BIDR, but LM2903BIPWR uses a different PW footprint and therefore cannot replace the target without PCB redesign.
Place each external pull-up resistor directly beside its open-collector output and the receiving input. Keep the two differential-input nets short, matched where practical, and separated from switching nodes and relay-coil wiring. Route the shared supply and ground connections to maintain low impedance, place the required bypass capacitor at the device, and connect it through a short ground path. These layout controls reduce false threshold transitions and keep a logic-low command from picking up pulses.
Calculate the pull-up current as approximately Vpull-up divided by Rpull-up, then ensure that current remains within the selected output sink rating with margin for supply and temperature variation. Also include continuous comparator supply current, divider current, reference current, and downstream input leakage. Open-collector wiring permits shared nodes, but every connected input must tolerate the pull-up voltage and every device must safely sink the total bus-low current.
Compliance Information
The verified excerpts do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. No compliance claim is inferred.
