Texas Instruments LM2903QDRG4Q1

Overview

LM2903QDRG4Q1 from Texas Instruments is an AEC-Q100 Grade 1 qualified dual open-drain voltage comparator for automotive systems, operating from 2 V to 36 V supply, with ±0.37 mV typical input offset voltage, 3.5 nA typical input bias current, and 1 µs typical propagation delay. It serves in HEV/EV powertrain monitoring, body control module voltage supervision, and infotainment system level-shifting interfaces.

For engineers reviewing the LM2903QDRG4Q1 datasheet, LM2903QDRG4Q1 pinout, LM2903QDRG4Q1 application, or LM2903QDRG4Q1 equivalent, key selection criteria include its automotive-grade temperature range (–40°C to +125°C), open-collector TTL/MOS/CMOS-compatible outputs, low 600 µA quiescent current at 36 V, and differential input voltage tolerance up to ±36 V - critical for robust sensor interface and fault-detection circuits.

Technical Context

The LM2903QDRG4Q1 implements a PNP Darlington-pair input stage enabling operation down to ground common-mode voltage and high DC gain, while limiting input common-mode range to (V–) to (V+) – 1.5 V. Its open-drain NPN output stage supports wired-AND logic and flexible pull-up configuration across voltage domains.

It operates on single or split supplies (V+ – V– = 2 V to 36 V), requires no minimum headroom between VCC and input common-mode voltage beyond 1.5 V, and features internal ESD protection rated at 2 kV HBM and 1 kV CDM - meeting AEC-Q100 stress test requirements for automotive Grade 1 applications.

Key Specifications

Pinout & Package

LM2903QDRG4Q1 is packaged in an SOIC-8 (D) package measuring 4.90 mm × 3.91 mm, with exposed pad not present. Pin functions are validated per TI SLCS141M datasheet Figure 1-1 and Section 1.1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2903QPWRQ1 and LM2903BQDRQ1, the LM2903QDRG4Q1 offers proven SOIC-8 manufacturability and lowest thermal resistance among through-hole-compatible packages, making it optimal for legacy automotive production lines and high-reliability under-hood modules where mechanical robustness is prioritized.

Availability

LM2903QDRG4Q1 is available at Aetrix Electronics and suitable for automotive HEV/EV battery management, body control module voltage supervision, and infotainment display interface applications requiring stable component supply across multi-year vehicle production cycles.

Supply support for LM2903QDRG4Q1 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 delivering analog, embedded processing, and connectivity solutions for automotive, industrial, and personal electronics markets.

The LM2903-Q1 product line was designed specifically for automotive-grade voltage comparison tasks - emphasizing AEC-Q100 qualification, wide supply range, ground-sensing capability, and open-drain flexibility to meet stringent functional safety and reliability requirements in modern vehicles.

FAQ

What automotive qualification does LM2903QDRG4Q1 meet?

The LM2903QDRG4Q1 is AEC-Q100 qualified for Grade 1 temperature range (–40°C to +125°C ambient), with HBM ESD rating of 2 kV and CDM rating of 1 kV. It satisfies stress testing requirements for passenger car powertrain, chassis, and body electronics - confirmed in TI's SLCS141M datasheet revision December 2024.

Can LM2903QDRG4Q1 operate with a single 3.3 V supply?

Yes, LM2903QDRG4Q1 operates from 2 V to 36 V, including 3.3 V single supply. At 3.3 V, it maintains full functionality: input common-mode range extends from GND to 1.8 V, propagation delay remains ≤1.3 µs, and output sink capability supports standard 3.3 V logic pull-ups - verified in Section 2.5 and Figure 2-4 of the datasheet.

Does LM2903QDRG4Q1 support dual-supply operation?

Yes, LM2903QDRG4Q1 supports dual supplies where V+ – V– ranges from 2 V to 36 V, provided V+ is at least 1.5 V more positive than the input common-mode voltage. This enables use in ±15 V op-amp interface circuits or isolated sensor front-ends - detailed in Section 3.1 and Absolute Maximum Ratings Table 2.2.

What is the maximum differential input voltage LM2903QDRG4Q1 can tolerate?

The LM2903QDRG4Q1 supports ±36 V differential input voltage (VID), meaning the voltage difference between IN+ and IN– can reach 72 V peak-to-peak without damage. This rating applies across the full operating temperature range and enables direct connection to unregulated battery-sensed signals - specified in Table 2.1 and Section 2.1.

How does the open-drain output of LM2903QDRG4Q1 interface with a 5 V microcontroller?

The LM2903QDRG4Q1 open-drain output interfaces with a 5 V microcontroller by connecting an external pull-up resistor (e.g., 5.1 kΩ) from 2OUT or 1OUT to 5 V. When the comparator asserts low, it sinks up to 21 mA, pulling the node to <400 mV - compatible with TTL/CMOS logic thresholds. No level-shifter IC is required.