Texas Instruments LM2903ZQDRQ1

Overview

LM2903ZQDRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified dual open-drain 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 circuits.

For engineers reviewing the LM2903ZQDRQ1 datasheet, LM2903ZQDRQ1 pinout, LM2903ZQDRQ1 application, or LM2903ZQDRQ1 equivalent, key selection criteria include its Grade 1 temperature range (–40°C to +125°C), open-collector TTL/MOS/CMOS-compatible outputs, differential input voltage tolerance up to ±36 V, low 200 µA per-comparator quiescent current, and functional safety documentation support.

Technical Context

The LM2903ZQDRQ1 implements a PNP Darlington-pair input stage enabling high gain, fast response, and rail-to-rail common-mode input range down to ground. Its open-drain NPN output stage allows flexible logic-level translation via external pull-up resistors and supports wired-AND configurations.

It operates across single or dual supplies (with supply difference between 2 V and 36 V), maintains stable performance over –40°C to +125°C ambient, and features integrated ESD protection rated at 2 kV HBM and 1 kV CDM-meeting AEC-Q100 requirements for automotive reliability.

Key Specifications

Pinout & Package

LM2903ZQDRQ1 is packaged in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with standard pinout compatible across LM2903-Q1 family variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2903ZQDRQ1, LM2903QPWRQ1 offers identical functionality in a smaller TSSOP package for density-sensitive layouts, while TLV1702QDRQ1 trades supply voltage headroom for improved DC precision in low-voltage domains-neither is pin-compatible, requiring schematic and layout updates.

Availability

LM2903ZQDRQ1 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 extended production lifecycles.

Supply support for LM2903ZQDRQ1 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 product line delivers AEC-Q100 qualified dual comparators optimized for automotive subsystems demanding wide supply range, robust ESD immunity, and long-term reliability under harsh thermal and electrical conditions.

FAQ

What is the maximum supply voltage rating for LM2903ZQDRQ1?

The LM2903ZQDRQ1 supports a maximum supply voltage of 36 V, verified per Absolute Maximum Ratings in the official datasheet (SLCS141M). This rating applies to single-supply operation and the difference between dual supplies. Exceeding 36 V risks permanent damage. The device maintains specified performance across its full 2 V to 36 V operating range, making it suitable for 12 V, 24 V, and 36 V automotive battery systems including load-dump conditions.

Does LM2903ZQDRQ1 support rail-to-rail input operation?

The LM2903ZQDRQ1 does not support full rail-to-rail input operation. Its common-mode input voltage range extends from ground to V_CC − 1.5 V for the inverting input, while the non-inverting input can exceed V_CC - a feature enabling high-side sensing. This behavior is confirmed in Section 2.9 (Electrical Characteristics) and Figure 3-1 (Functional Block Diagram) of the SLCS141M datasheet. It is not rated for operation with both inputs at V_CC or below GND.

What is the typical propagation delay of LM2903ZQDRQ1 and how is it measured?

The LM2903ZQDRQ1 has a typical propagation delay of 1 µs, measured under conditions of V_S = 5 V, V_CM = V_S/2, C_L = 15 pF, R_L = 5.1 kΩ, and 100 mV input overdrive (Section 2.10, SLCS141M). This value reflects high-to-low transition time for TTL-level inputs. Delay varies with overdrive voltage and supply - e.g., drops to 300 ns with 5 mV overdrive at 5 V - and is validated across the full –40°C to +125°C temperature range.

Is LM2903ZQDRQ1 pin-compatible with standard LM2903 variants?

Yes, LM2903ZQDRQ1 uses the industry-standard 8-pin SOIC (D) package with identical pinout to LM2903-Q1, LM2903B-Q1, and legacy LM2903 devices. Pin functions - including 1OUT, 1IN−, 1IN+, GND, 2IN+, 2IN−, 2OUT, and VCC - match exactly per Figure 1-1 and Table 1-1 in SLCS141M. No PCB layout changes are required when upgrading from non-automotive LM2903 to LM2903ZQDRQ1, though qualification status and temperature grading differ.

How does the open-drain output of LM2903ZQDRQ1 interface with microcontrollers?

The LM2903ZQDRQ1 open-drain output requires an external pull-up resistor to the target logic voltage (e.g., 3.3 V or 5 V). When the comparator asserts (IN− > IN+), the NPN sink transistor pulls the output to ~0.4 V at 4 mA, compatible with TTL and CMOS inputs. When inactive, the output floats high via the pull-up - enabling wired-AND logic and level translation. This configuration is explicitly validated in Figure 4-1 and Section 4.2 of SLCS141M for MCU interfacing.