LM2903AVQPWR - Dual Differential Comparator | Texas Instruments
MPN: LM2903AVQPWR ✓ ActiveLM2903AVQPWR Overview
A comparator is an analog semiconductor that evaluates two input voltages and produces a digital output indicating which input is higher. The LM2903 belongs to the voltage-comparator hierarchy, where it functions as a general-purpose interface between analog sensing circuits and digital logic. It is commonly used to monitor supply rails, detect threshold crossings, translate sensor signals, protect equipment, and support simple control loops. The open-collector outputs require an external pull-up resistor when the output must drive a logic node.
The LM2903AVQPWR includes two independent comparator channels, allowing separate comparisons within one package. The enhanced-voltage LM2903V family is identified in the manufacturer product information as supporting a wide range of supply voltages. The typical supply-current drain is listed as 0.4 mA per comparator, making the device suitable for low-power monitoring and embedded control systems where supply efficiency matters.
The device uses an 8-pin TSSOP package designated PW by Texas Instruments. The product information identifies the operating-temperature range as -40°C to 125°C for LM2903AVQPWR. The package is suitable for compact surface-mount PCB layouts, while the open-collector outputs provide flexible interface options to TTL, CMOS, open-drain buses, relay drivers, and other systems. The two channels share the supply pins but retain independent input and output functions.
Typical applications include automotive and industrial voltage supervision, battery monitoring, overvoltage and undervoltage detection, signal conditioning, window comparison, sensor thresholding, and logic-level translation. The -40°C to 125°C temperature range supports applications across industrial and automotive environments, subject to the device-specific operating and absolute-maximum ratings in the manufacturer datasheet.
Designers should account for the open-collector output when selecting the external pull-up resistor. The resistor value determines output rise time, while the transistor's sink-current capability limits the permissible load. Input common-mode range, output saturation level, response time, supply-voltage limits, and input offset should be checked against the specific application before finalizing the design.
This product overview combines the LM2903AVQPWR identity, TSSOP package information, comparator function, application guidance, and same-footprint replacement context to support faster engineering review and sourcing decisions.
Drop-in alternatives for LM2903AVQPWR — 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 LM2903AVQPWR (same form factor and footprint) — differing in Package, Number of Channels, Comparator Type.
LM2903PWR
✅ Drop-In📋 Reference alternative (not in catalog)
LM2903PT
✅ Drop-In ⚠️ Specs UnverifiedContact for price
View Datasheet →LM2903VQPWR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LM2903VQPWRQ1
✅ Drop-InContact for price
View Datasheet →LM2903VQPWRG4
✅ Drop-In ⚠️ Specs UnverifiedContact for price
View Datasheet →LM2903AVQPWR Maximum Ratings & Electrical Characteristics
| Comparator Type | Dual differential voltage comparator |
| Number of Channels | 2 |
| Supply Configuration | Single supply or dual supplies |
| Maximum Tested Supply Voltage | 30 V for V-suffix devices; 32 V for non-V devices |
| Supply Current Drain | 0.4 mA typical per comparator |
| Output Type | Open-collector |
| Input Configuration | Differential input |
| Operating Temperature Range | -40°C to 125°C |
| Package | 8-pin TSSOP (PW) |
| Mounting Type | Surface mount |
LM2903AVQPWR Pin Configuration
| Pin 1 | 1 OUT — Comparator 1 open-collector output |
| Pin 2 | 1 IN- — Comparator 1 inverting input |
| Pin 3 | 1 IN+ — Comparator 1 non-inverting input |
| Pin 4 | GND — Ground |
| Pin 5 | 2 IN+ — Comparator 2 non-inverting input |
| Pin 6 | 2 IN- — Comparator 2 inverting input |
| Pin 7 | 2 OUT — Comparator 2 open-collector output |
| Pin 8 | VCC — Positive supply |
Typical Applications
LM2903AVQPWR is suitable for 6 applications: Automotive Battery Threshold Detection, Industrial Overvoltage and Undervoltage Supervision, Sensor Signal Conditioning, Power-Supply Fault Signaling, Window Comparator for Limit Detection, Open-Drain Alarm and Relay Interface.
Automotive Battery Threshold Detection
The LM2903AVQPWR fits battery-threshold monitoring because two independent differential comparators can supervise separate voltage conditions in one package. Each channel can compare a divided battery voltage with a precision reference and change its open-collector state when the threshold is crossed. The enhanced-voltage family is intended for wide supply-voltage ranges, while the -40°C to 125°C operating range supports harsh environments. Confirm the exact automotive qualification orderable before production release and validate the input common-mode range throughout charging, cranking, and fault transients.
Recommended
Industrial Overvoltage and Undervoltage Supervision
The LM2903AVQPWR is suitable for factory power-supply supervision because its two differential comparator channels can monitor upper and lower rail limits independently. A resistor divider scales the rail to the input range, while a reference establishes each threshold; the open-collector outputs can drive status LEDs, system enables, or isolation logic through pull-up resistors. Its typical drain of 0.4 mA per comparator helps control supervisory-circuit overhead. Engineer the divider tolerance and trace noise so that measured trip points remain stable.
Recommended
Sensor Signal Conditioning
The LM2903AVQPWR can translate a conditioned analog sensor signal into a logic-compatible threshold event. The two channels allow independent comparison of, for example, a temperature-derived voltage against reference levels or a pair of differential sensor outputs against each other. Its differential inputs support direct comparison of balanced signals, while the open-collector output provides a flexible interface to MCU inputs, relay circuits, and alarm logic. Add hysteresis around the switching threshold to prevent repeated output toggling from sensor noise.
Recommended
Power-Supply Fault Signaling
The LM2903AVQPWR can implement dual fault detection for a regulated power module by comparing divided power rails against reference thresholds. One channel can indicate an undervoltage condition and the other an overvoltage condition, reducing the component count compared with two single comparators. Open-collector outputs allow the faults to be combined through pull-ups or wired logic. The 0.4 mA typical drain per comparator supports efficient monitoring, while the wide-voltage LM2903V family suits systems with a broad input range.
Recommended
Window Comparator for Limit Detection
The LM2903AVQPWR naturally supports window-comparator circuits because its two channels can establish lower and upper limits for the same measured voltage. Both outputs can remain active within the valid window, or logic can be combined to produce an out-of-range indication. This arrangement is useful in battery packs, industrial controls, instrument panels, and embedded systems. Stable reference generation and deliberate feedback hysteresis are important; otherwise rail variation, resistor tolerance, and input offset can shift the effective trip points.
Recommended
Open-Drain Alarm and Relay Interface
The LM2903AVQPWR can drive an alarm input or relay-control stage because each open-collector output can sink current from a pull-up rail. After detecting an overvoltage, undervoltage, or sensor threshold event, the comparator can deassert a fault signal or energize a downstream driver. The external pull-up allows the interface voltage to be selected independently from the comparator supply when compatible with the device limits. Confirm output sink-current capability, pull-up resistance, relay-coil flyback protection, and isolation requirements before implementation.
Recommended
Recommended Products Summary
Engineering reference data for LM2903AVQPWR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM2903PWR | LM2903PT | LM2903VQPWR | LM2903VQPWRQ1 | LM2903VQPWRG4 |
|---|---|---|---|---|---|---|
| Package | 8-TSSOP (PW) | 8-TSSOP (PW) | 8-TSSOP | 8-TSSOP (PW) | 8-TSSOP (PW) | 8-TSSOP (PW) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Comparator Configuration | Dual differential comparator | Dual differential comparator | Dual differential comparator | Dual differential comparator | Dual differential comparator | Dual differential comparator |
| Output Type | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector |
| Supply Configuration | Single supply or dual supplies | Single supply or dual supplies | Single supply or dual supplies | Single supply or dual supplies | Single supply or dual supplies | Single supply or dual supplies |
| Number of Channels | 2 | 2 | 2 | 2 | 2 | 2 |
Key Differentiators
- Enhanced-voltage LM2903V family distinction (vs LM2903PWR)
- Two independent comparison channels in one package (vs LM2903PT)
- Exact enhanced-voltage automotive-orderable option (vs LM2903VQPWR)
Design Notes
Do not treat the open-collector output as a push-pull logic output. Fit a suitable pull-up resistor to a compatible positive rail, and verify that the pull-up voltage remains within the output and supply limits. The resistor sets the output rise time and determines the current sunk when the output transistor is on. Avoid adding a pull-up above the device supply because the open-collector pin can otherwise be exposed to excessive voltage.
Add positive feedback, or otherwise introduce controlled hysteresis, when the compared signal crosses the threshold slowly or contains noise. Without hysteresis, output chatter can increase current in downstream logic and relay drivers. The hysteresis resistor should be returned to the appropriate input and reference node so that both threshold directions remain separated by the intended margin.
Place the pull-up resistor close to the open-collector output to minimize the trace area that can collect noise or couple between channels. Keep comparator input traces away from relay-coil wiring, switching-node copper, and other high-current paths. For single-supply operation, provide a low-impedance ground reference near the device and route divider currents with minimal resistance where accurate trip points are required.
Compliance Information
The retrieved manufacturer and distributor information does not provide explicit compliance statements for the exact LM2903AVQPWR orderable.