Texas Instruments LM2903BTQDGKRQ1

Overview

LM2903BTQDGKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified automotive dual open-drain comparator with ±0.37 mV typical input offset voltage, 3.5 nA typical input bias current, and 200 µA typical supply current per comparator across 2 V to 36 V supply range. It operates from –40°C to +125°C and supports ground-sensing inputs in HEV/EV battery monitoring and body control module voltage supervision.

For engineers reviewing the LM2903BTQDGKRQ1 datasheet, LM2903BTQDGKRQ1 pinout, LM2903BTQDGKRQ1 application, or LM2903BTQDGKRQ1 equivalent, this page delivers verified electrical specs, validated VSSOP-8 pin functions, automotive-grade thermal and ESD performance data (2 kV HBM), and direct alternative part comparisons for functional safety-aware design.

Technical Context

The LM2903BTQDGKRQ1 implements two independent PNP Darlington-pair input comparators enabling high gain (>200 V/mV), fast response (≤1 µs propagation delay), and rail-to-rail common-mode input range down to ground. Its open-drain outputs support wired-AND logic and level-shifting across mixed-voltage domains.

Designed for automotive functional safety systems, it features dedicated ESD protection on all pins (2 kV HBM / 1 kV CDM), tri-temp production testing (–40°C/25°C/125°C), and guaranteed operation over full Grade 1 temperature range without derating. Input stage clamping ensures robustness against overvoltage transients up to ±38 V differential.

Key Specifications

Pinout & Package

VSSOP-8 package (3.00 mm × 3.00 mm) with exposed thermal pad connected directly to GND for enhanced thermal dissipation in compact 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 LM2903BTQDGKRQ1 uniquely balances AEC-Q100 Grade 1 compliance, sub-millivolt offset, 2 kV ESD hardening, and open-drain flexibility - making it optimal for fault-aggregating, ground-referenced automotive sensing where reliability and interoperability are non-negotiable.

Availability

LM2903BTQDGKRQ1 is available at Aetrix Electronics and suitable for HEV/EV battery management, body control modules, and infotainment power sequencing requiring stable component supply under automotive qualification and long-term lifecycle assurance.

Supply support for LM2903BTQDGKRQ1 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 and embedded processing solutions for automotive, industrial, and personal electronics markets.

The LM2903-Q1 family was engineered specifically for automotive subsystems demanding AEC-Q100 qualification, extended temperature operation, and robust open-drain comparators - targeting powertrain, chassis, and body electronics where functional safety and field reliability are paramount.

FAQ

What is the maximum differential input voltage rating for LM2903BTQDGKRQ1?

The LM2903BTQDGKRQ1 supports ±38 V differential input voltage, exceeding standard automotive load dump requirements. This rating is confirmed in Section 2.2 Absolute Maximum Ratings of the official datasheet and enables direct connection to high-voltage nodes without external attenuation. The device maintains functionality and avoids latch-up even under transient overvoltage conditions that exceed battery rail limits.

Does LM2903BTQDGKRQ1 support single-supply operation down to ground on both inputs?

Yes, LM2903BTQDGKRQ1 supports true ground-sensing operation: its common-mode input voltage range includes 0 V, and either input can be driven to ground while the other remains within (V−) to (V+) − 1.5 V. This capability is explicitly specified in Section 2.9 Electrical Characteristics and enables direct interface with shunt-based current sensing and battery terminal monitoring without level-shifting circuitry.

What is the purpose of the exposed thermal pad on the VSSOP-8 package of LM2903BTQDGKRQ1?

The exposed thermal pad on the LM2903BTQDGKRQ1 VSSOP-8 package must be soldered directly to the PCB's GND plane to reduce thermal resistance (RθJB = 112.4°C/W). This improves power dissipation during sustained output sinking and stabilizes junction temperature in high-ambient automotive environments. TI's datasheet Figure 1-2 and Section 2.8 Thermal Information mandate direct GND connection for reliable operation at 125°C ambient.

How does the LM2903BTQDGKRQ1 differ from the standard LM2903-Q1 in terms of ESD performance?

The LM2903BTQDGKRQ1 is the "B" variant, featuring enhanced 2 kV HBM and 1 kV CDM ESD ratings versus 1 kV HBM/750 V CDM for the base LM2903-Q1. This improvement is achieved via dedicated on-die ESD protection structures on all pins, as documented in Section 2.4 ESD Ratings and the Features list. It meets AEC-Q100 H1C classification and provides superior robustness during automated assembly and field service.

Can LM2903BTQDGKRQ1 outputs be wire-OR'd with other open-drain comparators?

Yes, LM2903BTQDGKRQ1 outputs are fully compatible with wired-AND (wire-OR logic convention) configurations. Its open-drain NPN outputs allow multiple comparators to share a single pull-up resistor and common interrupt line to an MCU. This is explicitly supported in the Functional Description (Section 3.3) and Typical Application (Figure 4-1), enabling fault aggregation across multiple sensors without additional logic gates.