STMicroelectronics LM2903HDT

Overview

LM2903HDT from STMicroelectronics is a dual low-power voltage comparator IC operating from single supply (2V to 36V) or split supplies (±1V to ±18V), featuring rail-to-rail input common-mode range including ground, 25 nA typical input bias current, 250 mV typical output saturation voltage at 4 mA sink, and 1.3 µs small-signal response time. It is used in overvoltage detection circuits for industrial power supplies.

For engineers reviewing the LM2903HDT datasheet, LM2903HDT pinout, LM2903HDT application, or LM2903HDT equivalent, key selection criteria include input offset voltage (1–15 mV), wide temperature operation (–40°C to +150°C), SO-8 package compatibility, TTL/CMOS output interface capability, and robust differential input voltage tolerance (±36 V).

Technical Context

The LM2903HDT uses PNP-input transistor pairs enabling input common-mode voltage down to –0.3 V (including ground on single supply) and up to V_CC – 1.5 V. Its open-collector outputs support wired-OR logic and level translation across mixed-voltage systems.

It delivers stable performance across full industrial temperature range with supply current independent of V_CC (0.4 mA typ. at 5 V), and maintains functional integrity under differential input overvoltage up to ±36 V without damage - critical for noisy sensor interface and fault-monitoring applications.

Key Specifications

Pinout & Package

LM2903HDT is housed in an SO-8 (Small Outline, 8-pin) plastic micropackage per JEDEC MS-012, with 1.27 mm pitch, gull-wing leads, and thermal resistance R_thJA = 175°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM393DR and TLV3702IDR, LM2903HDT uniquely combines 150°C operation, ground-sensing capability on single supply, and sub-1 mV typical offset - making it optimal for harsh-environment industrial and automotive fault-detection circuits where reliability trumps ultra-low power or rail-to-rail output.

Availability

LM2903HDT is available at Aetrix Electronics and suitable for overvoltage protection circuits, battery cell monitoring systems, and motor phase loss detection requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM2903HDT 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The LM2903H series belongs to ST's precision analog comparators product line, engineered specifically for high-reliability industrial monitoring and fault-detection applications demanding extended temperature operation and robust input tolerance.

FAQ

Can LM2903HDT operate from a single 3.3 V supply?

Yes. LM2903HDT supports single-supply operation from +2 V to +36 V. At 3.3 V, it maintains full functionality: input common-mode range includes ground, output can sink ≥6 mA, and propagation delay remains within specification. However, output high-level voltage will be undefined (open-collector), requiring an external pull-up to 3.3 V.

Does LM2903HDT require external hysteresis for noise immunity?

Not inherently - hysteresis must be added externally via positive feedback. The device has no built-in hysteresis. For noisy sensor inputs (e.g., in motor current sensing), a resistor network from output to non-inverting input provides adjustable hysteresis; typical values are 1 MΩ feedback with 10 MΩ to ground for ~10 mV window.

What is the maximum safe output sink current at 150°C ambient?

At T_AMB = +150°C, the maximum continuous output sink current is 6 mA (min) per channel, verified per electrical characteristics table. Derating applies above 25°C ambient; total power dissipation must remain below 710 mW (SO-8 package limit), constraining simultaneous dual-channel sinking at high V_CC.

Is LM2903HDT pin-compatible with standard LM2903 variants?

Yes - LM2903HDT shares identical SO-8 pinout and electrical behavior with industry-standard LM2903 (e.g., LM2903DR, LM2903DT), including open-collector outputs, input stage topology, and absolute maximum ratings. The "H" suffix denotes enhanced temperature grade (–40°C to +150°C) and tighter parametric screening, not pinout change.