LM2903DG4

Overview

The LM2903DG4 is a dual differential voltage comparator from Texas Instruments, part of the industry-standard LMx93 family. It operates on a single supply voltage ranging from 2V to 30V or split supplies of ±1V to ±18V. The device features an input common-mode voltage range that includes ground and utilizes open-collector outputs compatible with TTL, MOS, and CMOS logic families. Designed for low power consumption, it draws quiescent current independent of the supply voltage. The component supports an operating temperature range from -40°C to 125°C and provides high differential input voltage tolerance.

Feature Summary

• Dual independent voltage comparators designed for wide-range single-supply operation
• Open-collector outputs enable wired-AND functionality and logic compatibility
• Input common-mode voltage range extends to the negative supply rail (ground)
• Low quiescent current consumption remains stable regardless of supply voltage variations

Applications

• Vacuum robot systems
• Single phase UPS units
• Server PSU monitoring
• Cordless power tools
• Wireless infrastructure equipment

Procurement Notes

Verify the specific package variant matches the design requirements, as the DG4 suffix indicates a lead-free RoHS-compliant version in a VSSOP-8 package. Confirm the operational voltage limits align with the non-B version specifications found in the datasheet. Ensure ESD handling procedures are followed during assembly due to the sensitivity of the input stages. Cross-reference the thermal resistance values for the specific PCB layout to maintain junction temperatures within safe operating limits.

Selection Notes

Select this component when a low-cost, general-purpose dual comparator is required for single-supply applications. It is suitable for designs needing ground-referenced input signals without requiring dual power rails. Consider the open-collector output structure if interfacing with different logic voltage levels. Evaluate the propagation delay characteristics against the signal frequency requirements of the target application circuit.

Part Context

This device belongs to the LM193/LM293/LM393/LM2903 family of dual comparators. These parts are widely used in industrial and consumer electronics for basic voltage threshold detection. The LM2903 variant typically offers extended temperature ranges compared to commercial grade parts. It serves as a foundational building block for analog signal processing and switching circuits.

Replacement Considerations

The LM2903B is a next-generation drop-in replacement offering improved specifications such as lower offset voltage and higher supply voltage capability up to 38V. Other compatible alternatives include the LM393 and LM293 series, though pinout and electrical characteristics should be verified for direct substitution.