Texas Instruments LM2903BQPWRQ1

Overview

LM2903BQPWRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified automotive dual open-drain comparator with ±0.37 mV typical input offset voltage, 200 µA typical supply current per comparator, and operation from 2 V to 36 V single or dual supplies. It serves as a precision voltage comparison element in HEV/EV powertrain monitoring and body control module threshold detection circuits.

For engineers reviewing the LM2903BQPWRQ1 datasheet, LM2903BQPWRQ1 pinout, LM2903BQPWRQ1 application, or LM2903BQPWRQ1 equivalent, key selection criteria include its −40°C to +125°C operating range, 3.5 nA typical input bias current, 1 µs typical propagation delay, open-drain output compatibility with TTL/MOS/CMOS, and AEC-Q100 functional safety documentation support.

Technical Context

The LM2903BQPWRQ1 implements a PNP Darlington pair input stage enabling high gain, low input bias current (3.5 nA typ), and common-mode input range extending to ground. Its open-drain NPN output stage supports wired-AND logic and level-shifting across supply domains up to 36 V.

It operates over 2 V to 36 V supply range with differential input voltage tolerance of ±38 V, input common-mode range from ground to (V+) − 2 V at full temperature range, and features dedicated ESD protection delivering 2 kV HBM and 1 kV CDM robustness per AEC-Q100.

Key Specifications

Pinout & Package

TSSOP-8 package (3.00 mm × 4.40 mm) with exposed thermal pad connected directly to GND for enhanced thermal performance in automotive PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual open-drain comparator applications.

Compared with LM2903QPWRQ1 and TLV1702QDRQ1, the LM2903BQPWRQ1 delivers superior offset accuracy and ESD immunity for high-reliability automotive sensing, while maintaining pin compatibility with legacy LM2903-Q1 footprints in TSSOP-8.

Availability

LM2903BQPWRQ1 is available at Aetrix Electronics and suitable for HEV/EV battery management, automotive infotainment power sequencing, and body control module designs requiring stable component supply across extended production lifecycles.

Supply support for LM2903BQPWRQ1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with deep expertise in automotive-grade IC design and AEC-Q100 qualification.

The LM2903B-Q1 product line was engineered specifically for automotive voltage comparison tasks requiring high reliability, wide supply range, and functional safety documentation - targeting powertrain, chassis, and body electronics subsystems.

FAQ

What is the maximum differential input voltage the LM2903BQPWRQ1 can withstand?

The LM2903BQPWRQ1 supports a differential input voltage range of ±38 V, verified per absolute maximum ratings. This allows safe operation during automotive load dump events and reverse-battery conditions without damage. The specification applies across the full −40°C to +125°C temperature range and is independent of supply voltage. LM2903BQPWRQ1 maintains functionality even when inputs exceed VCC by up to 38 V, provided common-mode limits are observed.

Does the LM2903BQPWRQ1 require external pull-up resistors on its outputs?

Yes, the LM2903BQPWRQ1 features open-drain outputs that require external pull-up resistors to define the logic-high voltage level. Typical values range from 2.2 kΩ to 10 kΩ depending on rise time and bus capacitance requirements. Pull-up to 1.8 V, 3.3 V, or 5 V is supported, enabling level translation between domains. Without a pull-up, the output remains floating in the high state. LM2903BQPWRQ1 cannot drive logic-high actively.

How does the LM2903BQPWRQ1's input bias current affect high-impedance sensor interfaces?

With 3.5 nA typical input bias current, the LM2903BQPWRQ1 introduces minimal error in high-impedance sensor interfaces - for example, adding only 0.35 mV offset error across a 100 kΩ source impedance. At worst-case 25 nA (max), error remains under 2.5 mV. This enables direct connection to thermistor networks, strain gauge bridges, and capacitive humidity sensors without buffer amplifiers. LM2903BQPWRQ1 maintains accuracy where input impedances exceed 1 MΩ.

Is the LM2903BQPWRQ1 pin-compatible with standard LM2903-Q1 variants in TSSOP-8?

Yes, the LM2903BQPWRQ1 uses identical TSSOP-8 pinout and footprint as LM2903QPWRQ1 and LM2903E-Q1 in the same package. All electrical connections - including 1OUT, 1IN−, 1IN+, GND, 2IN+, 2IN−, 2OUT, and VCC - match exactly. No PCB redesign is needed for drop-in replacement. LM2903BQPWRQ1 retains full mechanical and layout compatibility while improving offset, ESD, and bias current specifications.

What functional safety documentation is available for the LM2903BQPWRQ1?

Texas Instruments provides functional safety documentation for the LM2903BQPWRQ1 including FMEDA reports, safety manuals, and diagnostic coverage analysis aligned with ISO 26262 ASIL-B requirements. These documents detail failure modes, FIT rates (<100 FIT), and recommended diagnostic methods such as periodic output stuck-at testing. LM2903BQPWRQ1 is classified as a "functional safety-capable" device - meaning it supports system-level ASIL decomposition but requires customer implementation of safety mechanisms.