UC39431D

Overview

The UC39431D is a precision adjustable shunt voltage reference manufactured by Texas Instruments. It operates within an output voltage range of 2.3 V to 36 V and supports a maximum load current of 100 mA. The device features a low temperature coefficient of 50 ppm/°C and maintains high accuracy with a tolerance of ±0.39%. It is housed in an 8-pin SOIC package and functions as a three-terminal bipolar reference suitable for stable voltage regulation applications.

Feature Summary

• Provides precise adjustable shunt regulation across a wide voltage range
• Maintains stability with low temperature coefficient characteristics
• Supports high load current capability for demanding circuits

Applications

• Precision power supply regulation
• Voltage reference sources for analog-to-digital converters
• Battery-operated equipment requiring stable reference voltages

Procurement Notes

Verify the specific suffix D indicates the SOIC-8 package variant. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure thermal management aligns with the specified operating temperature range for reliable long-term performance in final assemblies.

Selection Notes

Select this component when a fixed reference is insufficient due to varying system voltage requirements. The adjustable nature allows customization of the reference point without changing hardware. Consider the 100 mA current limit when designing load circuits to ensure the device remains within its safe operating area during peak demand periods.

Part Context

This part belongs to the UC3943x family of precision shunt regulators from Texas Instruments. These devices are designed to replace Zener diodes in applications requiring higher accuracy and lower temperature drift. The family offers various package options and tolerance grades to suit different cost and performance constraints in power management designs.

Replacement Considerations

The UC39431DG4 is a lead-free version of the same functional device. Cross-reference with UC39431DRG4 if tape-and-reel packaging is required instead of tube packaging. Verify pinout compatibility before substitution to ensure direct replacement in existing PCB layouts.