TL431ASDT,215

Overview

The TL431ASDT,215 is a three-terminal adjustable shunt regulator manufactured by NXP Semiconductors. It operates within an input voltage range up to 37 V and provides an output voltage adjustable between approximately 2.5 V and 36 V using two external resistors. The device features an initial accuracy of 0.5% and supports an output current of 100 mA with a typical output impedance of 0.2 ohm. Designed for surface mount installation in TO-236-3 (SOT-23-3) packages, it functions reliably across automotive and commercial temperature ranges from -40 °C to +125 °C.

Feature Summary

• Three-terminal adjustable precision shunt regulation topology
• Active output circuitry providing sharp turn-on characteristics
• Specified thermal stability over automotive and commercial temperature ranges

Applications

• On-board regulation systems
• Adjustable power supplies
• Switching power supplies

Procurement Notes

Verify the specific suffix 'A' against official NXP documentation to confirm the exact accuracy grade and temperature range specifications. Ensure the ordering part number matches the required package variant and tape-and-reel quantity. Confirm compliance with RoHS directives as indicated in the manufacturer's datasheet before finalizing procurement orders.

Selection Notes

Select this component when precise voltage referencing is required in compact surface-mount designs. The SOT-23-3 package suits space-constrained PCB layouts. Verify that the application voltage does not exceed the 37 V maximum input rating. Consider the 0.5% initial accuracy for circuits requiring tight tolerance without external calibration.

Part Context

This device belongs to the TL431 series of programmable shunt regulators. It serves as a direct replacement for Zener diodes in many applications due to its superior performance and active output stage. The series is widely utilized in feedback loops for switching power supplies and as reference voltages in analog-to-digital conversion circuits.

Replacement Considerations

Compatible substitutes include the TL431BSDT,215 and TL431BMFDT,215. Verify that alternative part numbers match the required accuracy grade and package type before substitution.