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STMicroelectronics LM2903HDT — Analog & Data Acquisition

STMicroelectronics LM2903HDT Dual Comparator, -40°C to 150°C

MPNLM2903HDT
Obsolete

STMicroelectronics LM2903HDT, dual general-purpose comparator, open-collector rail-to-rail output, 2V to 36V supply range, -40°C to 150°C operating temperature, 8-SOIC package.

STMicroelectronics LM2903HDT datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM2903HDT specifications
ParameterValue
TypeGeneral Purpose
Output typeOpen-Collector, Rail-to-Rail
MountingSurface Mount
Voltage - input offset7mV @ 30V
Voltage - supply, single (Dual (±))2V ~ 36V, ±1V ~ 18V
Output current16mA @ 5V
Current - quiescent2.5mA
Current - input bias0.25µA @ 5V
Operating temperature-40°C ~ 150°C
PackageTape & Reel (TR) Cut Tape (CT)
Case8-SOIC (0.154\", 3.90mm Width)
Number of elements2

Product details

Dual comparator that ran hot — and now runs scarce

What set it apart from the standard LM2903 was its 150°C maximum junction temperature — 25°C higher than the commercial-grade parts, making it a fit for engine-bay electronics, downhole tools, or industrial ovens where the ambient air hits triple digits. Input bias current maxes at 0.25µA at 5V, and input offset voltage is 7mV max at 30V — typical numbers for a general-purpose comparator, but the wide supply and temperature range are the selection drivers.

The closest pin-compatible alternative within the LM2903 family is the LM2903DT, but that part is rated to 105°C, not 150°C. Verify the ambient temperature in your application before substituting.

Package and pin-compatibility note

Quiescent current is 2.5mA max for both comparators, and each output can sink 16mA at 5V — enough to drive a logic input or an LED indicator directly.

Frequently asked questions

What is the replacement for LM2903HDT?

There is no official direct replacement from STMicroelectronics that matches the 150°C temperature grade. The standard LM2903DT is pin-compatible but rated to 105°C, not 150°C. If your application requires the full 150°C rating, you may need to evaluate comparators from other manufacturers or accept the LM2903HDT sourced through the surplus channel. Confirm the thermal requirements of your board before substituting.

What is the operating temperature of LM2903HDT?

This extended upper limit (compared to the standard 105°C or 125°C) is the key differentiator of this variant.

What is the difference between LM2903HDT and LM2903DT?

The primary difference is the operating temperature range. The LM2903HDT is rated to 150°C, while the LM2903DT is rated to 105°C. Both are dual general-purpose comparators in the same 8-SOIC package with the same pinout, supply range, and output type. The 'H' in the suffix denotes the higher temperature grade.