LM2903BYDT

Overview

The LM2903BYDT is a dual low-power voltage comparator from STMicroelectronics, designed for single or dual supply operation. It operates within a wide voltage range of +2 V to +36 V (single) or ±1 V to ±18 V (dual). The device features a very low supply current of 0.5 mA typical and includes an input common-mode voltage range that encompasses the negative rail. Electrical specifications include a maximum input offset voltage of 5 mV, an input bias current of 20 nA typical, and a low output saturation voltage of 250 mV at 4 mA sink current. It is qualified for automotive applications and housed in an SO-8 package.

Feature Summary

• Automotive qualification compliant with AEC-Q100 standards
• Input common-mode voltage range extends to the negative power supply rail
• Outputs compatible with TTL, DTL, ECL, MOS, and CMOS logic families
• Low power consumption with supply current essentially independent of voltage

Applications

• Level shifters
• Sampling circuits
• Peak and zero crossing detectors
• Threshold detectors
• Automotive systems

Procurement Notes

Verify the specific ordering suffix 'Y' corresponds to the B-grade variant with increased maximum operating voltage capabilities as defined in the official datasheet. Confirm the package type matches the required PCB footprint, specifically the SO-8 dimensions provided in the mechanical data section. Ensure compliance with environmental directives such as RoHS by checking the ECOPACK specifications associated with this part number before finalizing procurement orders.

Selection Notes

Select this component when designing circuits requiring high input impedance and low power dissipation across a broad voltage spectrum. The B-grade specification offers improved electrical characteristics compared to standard versions. Consider the open-collector output structure which requires external pull-up resistors for proper logic level interfacing. Verify that the thermal resistance values align with the expected ambient temperature conditions of the target application environment.

Part Context

This device belongs to the LM2903B family of low-power dual voltage comparators. It serves as an automotive-grade alternative to general-purpose comparators, offering enhanced reliability and wider operating voltage ranges. The LM2903BYDT specifically utilizes the SO-8 surface-mount package, providing a compact solution for space-constrained designs while maintaining robust performance in industrial and automotive environments.

Replacement Considerations

Direct substitutes include other variants within the LM2903B family such as LM2903BYST (MiniSO-8), LM2903BYPT (TSSOP8), and LM2903BYQ3T (DFN8). These parts share identical electrical characteristics but differ in physical packaging. Cross-referencing pinouts and thermal properties is essential when transitioning between different package types within this product line.