KA431ADTF

Overview

The KA431ADTF is a three-terminal programmable shunt regulator manufactured by Fairchild Semiconductor. It operates as an adjustable voltage reference with an output range from approximately 2.5V to 36V, set via two external resistors. The device features a typical dynamic output impedance of 0.2Ω and supports a sink current capability between 1.0mA and 100mA. It exhibits a full-range temperature coefficient of 50ppm/°C and includes low output noise and fast turn-on response characteristics.

Feature Summary

• Programmable output voltage adjustable between VREF and 36 volts using external resistors
• Low dynamic output impedance for stable regulation performance
• Temperature compensated operation across the full rated operating temperature range

Applications

• Replacement for Zener diodes in precision voltage reference circuits
• On-line regulators within switching power supplies
• Voltage references for operational amplifier circuits

Procurement Notes

Verify component authenticity through authorized distribution channels due to potential availability constraints. Confirm RoHS compliance status and specific manufacturing lot details prior to integration. Ensure proper handling procedures are followed during assembly to maintain electrical integrity and prevent damage to the semiconductor junctions.

Selection Notes

Select this component when a precise, adjustable shunt regulator is required for feedback loops or reference generation. Consider the TO-92 package constraints for thermal management and board space. Evaluate the 50ppm/°C temperature coefficient against system stability requirements over the intended operating environment.

Part Context

This part belongs to the KA431 series of programmable shunt regulators, widely used in power management applications. It serves as a functional equivalent to other industry-standard devices like the TL431, offering similar pinouts and electrical characteristics for direct substitution in many existing designs requiring adjustable voltage referencing.

Replacement Considerations

Compatible substitutes include the TL431 and LM431 series. Verify pinout compatibility and electrical parameter alignment before implementation. Ensure replacement components meet the same temperature and current specifications for circuit continuity.