STMicroelectronics LM2903YST

Overview

LM2903YST from STMicroelectronics is an automotive-grade, low-power dual voltage comparator in MiniSO8 package, operating from single supply (2 V to 36 V) or dual supplies (±1 V to ±18 V), with input common-mode range extending to the negative rail, 25 nA typical input bias current, and 250 mV typical output saturation voltage at 4 mA sink - used in battery monitoring, overvoltage protection, and window comparators in automotive body control modules.

For engineers reviewing the LM2903YST datasheet, LM2903YST pinout, LM2903YST application, or LM2903YST equivalent, this page delivers verified electrical specs, MiniSO8 terminal mapping, automotive temperature range (-40 °C to +125 °C), ESD robustness (800 V HBM), and direct alternatives for AEC-Q100-compliant designs.

Technical Context

The LM2903YST implements two independent PNP-input comparators enabling rail-to-rail input operation down to the negative supply, even under single-supply configuration - critical for ground-referenced sensing. Its open-collector outputs support TTL/DTL/ECL/CMOS logic interfacing and wired-OR configurations.

Internal design includes matched input transistors for low offset drift, thermal compensation for stable performance across -40 °C to +125 °C, and current-limited output stages preventing latch-up during output short-circuit events - validated per AEC-Q100 stress testing.

Key Specifications

Pinout & Package

LM2903YST is supplied in MiniSO8 package: 3.0 mm × 4.9 mm body, 0.65 mm pitch, 0.75 mm height, wettable flanks optional, RoHS-compliant ECOPACK®2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2903YPT and LM2903H, the LM2903YST offers optimal balance of miniaturization (MiniSO8), automotive qualification, and precision (15 mV max offset) - making it preferred for space-constrained body electronics where thermal margin is adequate but board real estate is premium.

Availability

LM2903YST is available at Aetrix Electronics and suitable for automotive battery management, power rail supervision, and sensor interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM2903YST 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 microcontrollers, power devices, sensors, and analog ICs for automotive, industrial, and consumer markets.

The LM2903 product line delivers robust, cost-optimized comparators targeting automotive and industrial applications demanding AEC-Q100 compliance, wide supply tolerance, and rail-to-rail input operation - with MiniSO8 variants like LM2903YST emphasizing compactness for space-sensitive modules.

FAQ

Is LM2903YST pin-compatible with standard LM2903 variants in SO8 or TSSOP8 packages?

Yes - LM2903YST uses the same 8-pin MiniSO8 pinout as defined in ST's official package drawing (Figure 24, DS0507 Rev 15), matching the functional pin assignment of SO8 and TSSOP8 versions: OUT1, IN1–, IN1+, VCC–, VCC+, OUT2, IN2–, IN2+. No PCB redesign is needed when migrating from SO8 to MiniSO8 footprints with appropriate land pattern adaptation.

Does LM2903YST support true single-supply operation with inputs referenced to ground?

Yes - its PNP-input stage enables input common-mode voltage range down to VCC– (typically ground), allowing direct connection of sensors or resistive dividers without level-shifting. This is confirmed in Table 2 (Vicm = 0 V to VCC+ – 1.5 V) and Figure 1 schematic, where INx– and INx+ accept signals at or below ground potential.

What is the maximum sink current capability of LM2903YST outputs, and how does it vary with temperature?

LM2903YST guarantees minimum 6 mA sink current at -40 °C to +125 °C (Table 3, Isink), with typical performance reaching 16 mA at 25 °C. Output saturation voltage remains ≤400 mV across full temperature range at 4 mA load - ensuring reliable logic-low assertion into 5 V TTL or CMOS inputs without external buffering.

Can LM2903YST be used in place of LM393 in existing designs?

Yes - LM2903YST is functionally and electrically equivalent to LM393 (same core architecture, pinout, and key specs), but adds AEC-Q100 qualification, tighter input offset distribution (1–15 mV vs. 2–9 mV for LM393), and MiniSO8 packaging. No circuit modification is required; verify thermal dissipation margins due to MiniSO8's higher Rthja (190 °C/W).