KA431AZTA_F081

Overview

The KA431AZTA_F081 is a programmable shunt regulator manufactured by onsemi, belonging to the KA431A series. It features an adjustable output voltage range from 2.5V to 36V with a typical dynamic output impedance of 0.2Ω. The device supports a sink current capability between 1mA and 100mA and has a maximum reference input voltage of 37V. It operates within a temperature range of -25°C to +85°C and offers an initial accuracy of 1% with a temperature coefficient of 50 PPM/°C. The component is housed in a TO-92-3 Kinked Lead package for through-hole mounting.

Feature Summary

• Programmable output voltage adjustable between the internal reference and maximum cathode voltage using two external resistors
• Sharp turn-on characteristic providing active output circuitry performance superior to standard zener diodes
• Temperature compensated operation ensuring thermal stability across the full rated operating temperature range

Applications

• Replacement for zener diodes in precision reference voltage circuits
• Voltage adapters and charger designs requiring stable regulation
• Adjustable power supply output regulation

Procurement Notes

Verify the specific suffix F081 against official onsemi documentation to confirm packaging details and availability status. Cross-reference the KA431AZTA datasheet for pinout and electrical limits. Confirm RoHS compliance and lead finish specifications required for your assembly process before procurement.

Selection Notes

Select this component when a low-cost, high-accuracy programmable reference is needed in a through-hole package. Ensure the application current stays within the 1mA to 100mA sink range. Verify that the operating temperature environment falls within the specified -25°C to +85°C limits for reliable performance.

Part Context

This part is part of the KA431 family of three-terminal adjustable regulators. It serves as a direct functional equivalent to industry-standard TL431 devices. The KA431A variant typically offers improved accuracy compared to the base KA431 model. It is widely used in offline switch-mode power supplies and battery chargers.

Replacement Considerations

The TL431AILPG is listed as a potential replacement. Verify pin compatibility and electrical parameter alignment with the original design requirements before substitution.