STMicroelectronics LM2903YQ3T

Overview

LM2903YQ3T from STMicroelectronics is a low-power dual voltage comparator in DFN8 2×2 mm wettable flanks package, operating from +2 V to +36 V single supply or ±1 V to ±18 V dual supplies, 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 automotive window lift control, battery monitoring, and overvoltage protection circuits.

For engineers reviewing the LM2903YQ3T datasheet, LM2903YQ3T pinout, LM2903YQ3T application, or LM2903YQ3T equivalent, this page delivers verified electrical specs, validated DFN8 pin mapping, automotive-grade thermal performance data (R_thJA = 57 °C/W), and direct substitution guidance for AEC-Q100-compliant designs.

Technical Context

The LM2903YQ3T integrates two independent PNP-input comparators with rail-to-rail input capability down to the negative supply, enabling accurate threshold detection in single-supply systems without level-shifting. Its open-collector outputs support TTL/DTL/ECL/CMOS logic interfacing and wired-OR configurations.

Designed for automotive environments, it features guaranteed operation from −40 °C to +125 °C, 800 V HBM ESD rating, and thermal resistance of 57 °C/W (junction-to-ambient) in its DFN8 wettable flanks package - critical for under-hood sensor signal conditioning where thermal dissipation and solder-joint reliability are essential.

Key Specifications

Pinout & Package

LM2903YQ3T uses a 2×2 mm DFN8 package with wettable flanks (pitch 0.5 mm), optimized for automated optical inspection (AOI) and high-reliability solder joints in automotive production. Exposed pad may be left floating or connected to ground for improved thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2903W and LM2903H, the LM2903YQ3T offers optimal balance of AEC-Q100 qualification, wettable-flank solderability, and thermal performance for mainstream automotive body control modules - while LM2903W adds ESD headroom and LM2903H extends temperature margin beyond typical under-hood needs.

Availability

LM2903YQ3T is available at Aetrix Electronics and suitable for automotive body electronics, industrial power supervision, and battery management systems requiring stable component supply with full AEC-Q100 traceability and DFN8 wettable flank process validation.

Supply support for LM2903YQ3T 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 silicon solutions for automotive, industrial, and consumer markets since 1987.

The LM2903 product line delivers robust, low-power analog comparators optimized for automotive-grade reliability, extended temperature operation, and seamless integration into safety-critical signal-conditioning paths.

FAQ

What is the maximum differential input voltage the LM2903YQ3T can tolerate?

The LM2903YQ3T supports a differential input voltage (V_ID) of ±36 V, matching the full supply voltage range. This allows inputs to swing beyond the rails - for example, a +40 V signal applied to IN+ with IN− at GND remains within safe operating limits as long as the common-mode voltage stays within −0.3 V to V_CC + −1.5 V.

Can the LM2903YQ3T drive a 10 kΩ pull-up resistor to 24 V?

Yes - with V_CC+ = 24 V and I_SINK = 2.4 mA, the output saturation voltage remains ≤400 mV (max) per datasheet Table 3, ensuring a clean logic-low state. The device sustains this sink current continuously without thermal derating in its DFN8 package at ≤85 °C ambient.

Is the exposed pad on the LM2903YQ3T DFN8 package electrically connected?

No - the exposed pad is not internally connected to any circuit node. It may be left floating or tied to V_CC− (GND) to improve thermal conduction and mechanical solder-joint strength. ST's recommended footprint (Figure 26) specifies a 0.75 mm × 0.50 mm thermal pad with solder mask defined.

Does the LM2903YQ3T require external hysteresis for noise immunity in automotive environments?

Yes - the base device has no built-in hysteresis. For noisy applications like alternator ripple detection or switch debouncing, external positive feedback (e.g., 10 MΩ from OUT1 to IN1+) adds 10–50 mV of adjustable hysteresis. This prevents oscillation at threshold crossings while maintaining sub-µs response to valid transitions.