STMicroelectronics LM2903WHYST

Overview

LM2903WHYST from STMicroelectronics is a low-power, dual-voltage comparator in MiniSO8 package, rated for automotive-grade operation from −40 °C to +150 °C. It operates from single supplies (2 V to 36 V) or dual supplies (±1 V to ±18 V), features 25 nA typical input bias current, 250 mV typical output saturation voltage at 4 mA sink, and rail-to-rail input common-mode range including the negative rail - used in battery monitoring, overvoltage protection, and industrial sensor interface circuits.

For engineers reviewing the LM2903WHYST datasheet, LM2903WHYST pinout, LM2903WHYST application, or LM2903WHYST equivalent, key selection criteria include its AEC-Q100 qualified MiniSO8 footprint, −40 °C to +150 °C operating range, 0.4 mA supply current per comparator at 5 V, TTL/CMOS-compatible open-collector outputs, and input offset voltage of 1 mV (typ) with 15 mV (max) over temperature.

Technical Context

The LM2903WHYST integrates two independent PNP-input comparators optimized for wide-supply operation and robustness in harsh environments. Its input stage allows common-mode voltage down to the negative rail, enabling direct ground-referenced sensing without level-shifting. The open-collector outputs support wired-OR logic and flexible pull-up configurations across TTL, CMOS, and ECL families.

Designed for automotive and industrial applications, it includes 2 kV HBM ESD protection on all pins and is characterized for thermal stability up to 150 °C ambient. Differential input voltage range equals full supply voltage, and output sink current reaches 6 mA minimum (16 mA typ) with 250 mV saturation at 4 mA - critical for driving LEDs, relays, or logic inputs under low-voltage conditions.

Key Specifications

Pinout & Package

LM2903WHYST is housed in an 8-pin MiniSO8 plastic micropackage (3.0 × 4.9 mm, 0.65 mm pitch), optimized for space-constrained automotive modules and industrial PCBs. The package meets ECOPACK® environmental compliance standards and supports reflow soldering per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2903DT and TLV3702IDR, the LM2903WHYST uniquely combines AEC-Q100 Grade 0 qualification, 36 V supply capability, and −40 °C to +150 °C operation - making it the only choice for under-hood automotive voltage supervision where reliability across extreme thermal and electrical stress is non-negotiable.

Availability

LM2903WHYST is available at Aetrix Electronics and suitable for automotive battery management, industrial overvoltage protection, and high-temperature sensor interface applications requiring stable component supply across long production lifecycles.

Supply support for LM2903WHYST 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, Switzerland, designing and manufacturing products for automotive, industrial, and power management markets.

The LM2903WHYST belongs to ST's precision analog comparator family, engineered specifically for automotive-grade reliability, wide-supply operation, and robust performance in thermally demanding environments.

FAQ

Can LM2903WHYST operate from a single 3.3 V supply?

Yes. The LM2903WHYST supports single-supply operation from 2 V to 36 V, including 3.3 V. At 3.3 V, its input common-mode range extends from 0 V to 1.8 V (VCC+ − 1.5 V), and output saturation remains below 400 mV at 4 mA sink - enabling direct interfacing with 3.3 V logic while maintaining noise margin.

Does LM2903WHYST require external hysteresis for stable switching?

No, but it supports optional external hysteresis via positive feedback. The device has no built-in hysteresis; however, its low input bias current (25 nA typ) and high input impedance allow precise, predictable hysteresis network design using standard resistors - commonly applied in noisy environments like motor control or power supply sequencing.

What is the maximum sink current per output of LM2903WHYST?

The LM2903WHYST guarantees a minimum output sink current of 6 mA at VO = 1.5 V and Vid = −1 V, with typical performance reaching 16 mA. Absolute maximum ratings limit continuous output current to avoid junction temperature exceedance; derating is required above 125 °C ambient per R_thJA = 190 °C/W.

Is LM2903WHYST pin-compatible with standard LM2903 variants?

Yes, the LM2903WHYST shares identical pinout and electrical behavior with industry-standard LM2903 dual comparators in SO-8 and MiniSO8 packages. Its MiniSO8 footprint matches LM2903xYST variants, and functional compatibility is maintained across supply ranges, input offsets, and output drive - enabling drop-in replacement where AEC-Q100 qualification and extended temperature are required.