Texas Instruments LM2903DRCT

Overview

LM2903DRCT from Texas Instruments is an AEC-Q100 Grade 1 qualified dual open-drain voltage comparator designed for automotive and industrial sensing, level-shifting, and window-detection circuits. It operates from 2 V to 36 V single supply (or ±18 V dual supply), delivers ±0.37 mV typical input offset voltage, 3.5 nA typical input bias current, and 200 µA typical quiescent current per comparator across –40°C to +125°C.

For engineers reviewing the LM2903DRCT datasheet, LM2903DRCT pinout, LM2903DRCT application, or LM2903DRCT equivalent, this page provides verified technical context, automotive-grade reliability data, open-drain output design guidance, and validated alternative options for cost-sensitive, high-voltage comparator designs.

Technical Context

The LM2903DRCT implements two independent PNP Darlington-pair input comparators with rail-to-rail common-mode input range down to ground and differential input capability up to ±36 V. Its open-drain NPN output stage enables flexible logic-level translation and wired-AND functionality via external pull-up resistors.

It supports functional safety system design with documented failure modes, FIT rate data, and diagnostic coverage support. The device features improved 2 kV HBM ESD protection (H1C classification) and enhanced negative input voltage handling versus legacy LM2903-Q1 variants.

Key Specifications

Pinout & Package

LM2903DRCT is packaged in an 8-pin WSON (DSG) package measuring 2.00 mm × 2.00 mm with exposed thermal pad. The thermal pad must be connected directly to GND for optimal thermal performance and ESD robustness.

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 LM2903DRCT offers superior ESD immunity (2 kV vs. 1 kV), lower offset voltage (±0.37 mV vs. ±4 mV), and smaller WSON footprint - making it optimal for space-constrained, high-reliability automotive modules where precision and robustness are critical.

Availability

LM2903DRCT is available at Aetrix Electronics and suitable for automotive powertrain control, infotainment sequencing, and industrial motor protection requiring stable component supply across extended temperature and voltage ranges.

Supply support for LM2903DRCT 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 family was engineered specifically for AEC-Q100-compliant automotive subsystems - emphasizing wide supply tolerance, ground-sensing capability, open-drain flexibility, and long-term reliability under harsh thermal and electrical conditions.

FAQ

What is the maximum supply voltage rating for LM2903DRCT?

The LM2903DRCT supports a maximum supply voltage of 36 V on the VCC pin. This rating applies across its full operating temperature range of –40°C to +125°C and enables direct interface with 12 V and 24 V automotive battery rails without external regulation. Absolute maximum ratings also permit differential input voltages up to ±36 V, protecting against transient overvoltage events.

Does LM2903DRCT support dual-supply operation?

Yes, LM2903DRCT supports dual-supply operation with a total supply voltage (V+ – V−) ranging from 2 V to 36 V. However, the V− pin is not brought out - instead, GND serves as the reference node. When used in dual-supply mode, the device requires that VCC be at least 1.5 V more positive than the input common-mode voltage to ensure proper operation of the PNP Darlington input stage.

How does the open-drain output of LM2903DRCT interface with a 3.3 V microcontroller?

The LM2903DRCT open-drain output interfaces with a 3.3 V microcontroller by connecting an external pull-up resistor from the output pin (e.g., 1OUT) to the 3.3 V logic rail. When the comparator asserts low, the NPN sink transistor pulls the line to <400 mV (at 4 mA load), satisfying the MCU's logic-low threshold. When inactive, the pull-up defines the logic-high level at 3.3 V - enabling seamless voltage-level translation without level-shifters.

Is LM2903DRCT pin-compatible with standard LM2903 variants?

No, LM2903DRCT is not pin-compatible with SOIC-8 or TSSOP-8 versions of LM2903 due to its 8-pin WSON (DSG) package with bottom-exposed thermal pad. While the pin functions match the industry-standard LM2903 pinout (1OUT, 1IN−, 1IN+, GND, VCC, 2IN+, 2IN−, 2OUT), the DSG package requires different PCB land pattern, solder stencil, and thermal pad routing - necessitating layout revision for migration.

What automotive temperature grade does LM2903DRCT meet?

LM2903DRCT meets AEC-Q100 Grade 1 requirements, qualifying it for ambient operating temperatures from –40°C to +125°C. This grade is specified for engine compartment–adjacent modules such as body control units, HVAC controllers, and ADAS sensor interfaces - and is validated through extended temperature cycling, HTOL, and ESD stress testing per AEC-Q100-002 and -011 standards.