UC39431N

Overview

The UC39431N is a precision adjustable shunt voltage regulator manufactured by Texas Instruments. It features an internal error amplifier and reference, providing a sink capability of 100 mA. The device operates with an output voltage range from 1.3 V to 36 V. It offers high accuracy with a tolerance of ±0.39%. The component is housed in an 8-PDIP package and is designed for through-hole mounting.

Feature Summary

• Precision adjustable regulation architecture
• High current sink capability
• Wide operating voltage range

Applications

• Voltage reference circuits
• Battery chargers
• Power supplies

Procurement Notes

Verify the specific suffix 'N' indicates the PDIP package variant. Confirm the ±0.39% tolerance requirement matches application needs. Check for lifecycle status as availability may vary. Ensure thermal management aligns with 100 mA sink loads. Validate pinout compatibility during PCB layout.

Selection Notes

Select this component when precise shunt regulation is required over a wide voltage span. Consider the 100 mA sink limit for load requirements. Evaluate the 8-PDIP package for assembly constraints. Compare against other shunt regulators if tighter tolerances or higher currents are needed.

Part Context

This part belongs to the Unitrode family of power management ICs. It serves as a stable reference element in linear and switching power topologies. The design integrates error amplification directly on-chip to minimize external component count.

Replacement Considerations

UC39431IDR is a surface-mount alternative with identical electrical characteristics. Verify package footprint differences before substitution.