KA431SAMF2TF

Overview

The KA431SAMF2TF is a programmable shunt regulator manufactured by onsemi. It functions as a three-terminal 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 cathode currents between 1mA and 100mA. It includes temperature compensation for full operating ranges, low output noise, and fast turn-on response.

Feature Summary

• Programmable output voltage adjustable over a wide range using external resistors
• Low dynamic output impedance ensuring stable regulation performance
• Temperature compensated operation across the full rated operating temperature range

Applications

• Precision voltage references in power supply circuits
• Replacement for Zener diodes requiring higher accuracy
• Output voltage regulation in switching power supplies

Procurement Notes

Verify the specific suffix SAMF2TF against the official onsemi datasheet to confirm package type and tape-and-reel specifications. Ensure the component matches the required thermal stability and current handling capabilities for the target application design.

Selection Notes

Select this component when a precise, adjustable reference is needed instead of a fixed Zener diode. Consider the 0.2Ω dynamic impedance and 1-100mA sink current capability. Verify that the 36V maximum output range meets the circuit requirements.

Part Context

This part belongs to the KA431 series of programmable shunt regulators. It is functionally compatible with industry-standard TL431 devices. The series is widely used in feedback loops for isolated and non-isolated power converters where accurate voltage monitoring is critical.

Replacement Considerations

The KA431 is generally pin-compatible with the TL431 and LM431 families. Verify electrical parameters such as dynamic impedance and temperature coefficient match the original design requirements before substitution.