Texas Instruments LM2903DGKRG4

Overview

LM2903DGKRG4 from Texas Instruments is a dual precision comparator IC designed for industrial and automotive voltage monitoring, level detection, and window comparator applications. It features ±0.37 mV typical input offset voltage, 200 µA per comparator supply current, 1 µs propagation delay, rail-to-rail input common-mode range including ground, and operation up to 36 V supply. It is widely used in server PSUs and motor drive control circuits.

For engineers reviewing the LM2903DGKRG4 datasheet, LM2903DGKRG4 pinout, LM2903DGKRG4 application, or LM2903DGKRG4 equivalent, key selection criteria include its B-version enhanced ESD rating (2 kV HBM), extended temperature range (–40°C to +125°C), low-input-bias-current design (3.5 nA typ), open-collector output compatibility with TTL/MOS/CMOS, and VSSOP-8 packaging for space-constrained PCB layouts.

Technical Context

The LM2903DGKRG4 implements two independent high-gain comparators with internal ESD clamps, enabling robust operation in noisy industrial environments. Its input stage supports common-mode voltages down to ground and up to VCC – 2 V, while differential input voltage tolerance reaches ±38 V - exceeding standard supply rails.

It uses an open-collector output architecture requiring external pull-up resistors, supporting flexible logic-level interfacing across 3.3 V, 5 V, and 12 V systems. Quiescent current remains stable across 2 V to 36 V supply range and is independent of temperature and load conditions.

Key Specifications

Pinout & Package

The LM2903DGKRG4 is housed in an 8-pin VSSOP (DGK) package measuring 3.00 mm × 3.00 mm with 0.65 mm pitch, optimized for high-density PCB layouts and thermal performance (R_θJA = 193.7°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2903DR and LM393BDR, the LM2903DGKRG4 delivers superior thermal performance in space-constrained designs and full automotive temperature qualification - making it optimal for motor control and server PSU applications demanding long-term reliability under thermal stress.

Availability

LM2903DGKRG4 is available at Aetrix Electronics and suitable for server power supplies, industrial motor drives, and automotive body control modules requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for LM2903DGKRG4 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 industrial, automotive, and communications markets.

The LM2903B series - including LM2903DGKRG4 - was engineered to replace legacy dual comparators with improved offset, speed, ESD resilience, and temperature range for next-generation power management and real-time control systems.

FAQ

What is the maximum supply voltage rating for LM2903DGKRG4?

The LM2903DGKRG4 supports a maximum supply voltage of 36 V under recommended operating conditions. Absolute maximum rating is 38 V, but sustained operation above 36 V risks parametric degradation and reduced reliability. This 36 V rating enables direct interface with 24 V industrial buses and 32 V automotive systems without pre-regulation.

Does LM2903DGKRG4 require external pull-up resistors on its outputs?

Yes, LM2903DGKRG4 features open-collector outputs and requires external pull-up resistors on both 1OUT and 2OUT pins. Typical values range from 1 kΩ to 10 kΩ depending on rise time and bus capacitance. Pull-up to any voltage ≤ VCC is permitted, enabling level translation - for example, pulling up to 3.3 V while operating from a 12 V supply.

Can LM2903DGKRG4 operate with input voltages below ground?

No - the LM2903DGKRG4 does not support input voltages below ground. Input pins must remain ≥ –0.3 V relative to GND to avoid incorrect output states and excessive input current. The common-mode range starts at GND and extends to VCC – 2 V, making it ideal for single-supply, ground-referenced sensing but unsuitable for bipolar signal conditioning.

What is the typical input offset voltage of LM2903DGKRG4 over temperature?

The LM2903DGKRG4 has a typical input offset voltage of ±0.37 mV at 25°C, with a maximum of ±4 mV across the full –40°C to +125°C operating range. This tight offset specification ensures consistent trip-point accuracy in temperature-critical applications such as thermal cutoff circuits and precision voltage monitors.

Is LM2903DGKRG4 pin-compatible with older LM2903 variants?

Yes, LM2903DGKRG4 is pin-compatible with standard LM2903 devices in VSSOP-8 (DGK) packaging, including LM2903DRG4 and LM2903D. It maintains identical pinout, electrical behavior, and footprint - allowing drop-in replacement without PCB redesign. However, always verify thermal and layout constraints due to differences in package thermal resistance.