UC39431N

Overview

The UC39431N is a precision adjustable shunt voltage reference manufactured by Unitrode, now part of Texas Instruments. It provides an adjustable output voltage range from 1.3V to 36V with an initial accuracy of ±0.39% and a temperature coefficient of 2.5 ppm/°C. The device supports an output current up to 100 mA and features low noise characteristics. It is housed in an 8-pin PDIP package.

Feature Summary

• Adjustable output voltage capability spanning from 1.3V to 36V
• High precision with ±0.39% initial accuracy and low temperature drift
• Capable of sourcing up to 100 mA output current
• Low noise performance for sensitive analog applications

Applications

• Precision power supply regulation
• Battery charging circuits
• Voltage reference standards
• Feedback loop control in switching regulators

Procurement Notes

Verify the manufacturer designation carefully, as Unitrode was acquired by Texas Instruments. Ensure the specific suffix matches the required package type (PDIP) and temperature grade. Confirm RoHS compliance status if required for your assembly process. Cross-reference the datasheet revision to ensure pinout and electrical specifications align with your design requirements before finalizing procurement.

Selection Notes

Select this component when a stable, adjustable reference voltage is needed within the 1.3V to 36V range. Its high accuracy and low temperature coefficient make it suitable for applications requiring minimal drift over varying thermal conditions. Consider the 100 mA current capability for driving feedback networks or loads directly without additional buffering stages.

Part Context

This component belongs to the UC3943x series of precision shunt regulators. These devices are widely used in power management systems where reliable voltage referencing is critical. The UC39431N specifically offers adjustable output, distinguishing it from fixed-voltage counterparts in the same family.

Replacement Considerations

Check for UC39432D or other UC3943x series variants for similar functionality. Verify pin compatibility and electrical parameters against the original design specifications before substitution.