LM2903WDT

Overview

The LM2903WDT is a dual low-power voltage comparator manufactured by STMicroelectronics, housed in an SOIC-8 surface-mount package. It operates from a single supply of 2 V to 36 V or dual supplies of ±1 V to ±18 V. Key electrical parameters include a typical supply current of 0.4 mA, input bias current of 25 nA, and output saturation voltage of 250 mV at 4 mA load. The device features a response time of 1.3 µs, input offset voltage of 7 mV, and supports CMOS, DTL, ECL, MOS, and TTL outputs.

Feature Summary

• Dual independent comparators designed for wide voltage range operation with single or split power supplies.
• Input common-mode voltage range includes the negative supply rail, enabling ground-referenced signaling.
• Low power consumption with supply current essentially independent of the supply voltage magnitude.
• Output compatibility with standard logic families including TTL, DTL, ECL, MOS, and CMOS.

Applications

• Transducer amplification circuits
• DC gain blocks
• Logic interface electronics

Procurement Notes

Verify the specific suffix 'WDT' against the manufacturer's official datasheet to confirm the SOIC-8 package and tape-and-reel packaging configuration. Ensure the component meets the required operating temperature range of -40°C to +125°C for your specific application environment. Cross-reference the ordering part number with the latest STMicroelectronics documentation to avoid discrepancies in package type or electrical specifications.

Selection Notes

Select this component when low power consumption is critical alongside wide supply voltage flexibility. The inclusion of the negative rail in the input common-mode range makes it suitable for single-supply systems requiring ground-level signal detection. Verify that the 1.3 µs response time and 7 mV offset voltage meet the precision and speed requirements of the target circuit design.

Part Context

This device belongs to the LM2903 family of analog comparators. It serves as a low-power alternative to higher-speed comparators, prioritizing energy efficiency over rapid switching speeds. The WDT suffix indicates a specific surface-mount packaging variant within the broader LM2903 product line, distinct from through-hole or automotive-grade derivatives like the LM2903YQ3T.

Replacement Considerations

Public confirmed substitute part numbers: None identified in source material.