TL431AFDT,215

Overview

The TL431AFDT,215 is an adjustable precision shunt voltage reference manufactured by Nexperia USA Inc. It operates within a cathode-to-anode voltage range of 2.495 V to 36 V and provides a programmable output voltage set by two external resistors. The device features a ±1% initial accuracy tolerance for the reference voltage. It supports a maximum sink current of 100 mA with a minimum operating cathode current of 600 µA. The component is housed in a TO-236AB (SOT-23) surface-mount package and is rated for an ambient temperature range of -40°C to +125°C.

Feature Summary

• Programmable output voltage capability up to 36 V via external resistor divider
• High initial accuracy with ±1% reference voltage tolerance
• Wide operational temperature range suitable for industrial environments
• Low output noise characteristics for sensitive circuit applications

Applications

• Shunt regulator circuits
• Isolated feedback loops for Switch Mode Power Supplies (SMPS)
• Precision constant current sinks
• Precision current limiters

Procurement Notes

Verify the specific suffix '215' corresponds to the standard reel packaging configuration when ordering. Confirm that the A-grade tolerance meets design requirements compared to B-grade or C-grade alternatives. Ensure the TO-236AB footprint matches the PCB layout constraints. Check for RoHS compliance status if required by local regulations.

Selection Notes

Select this variant when a tighter voltage tolerance than the standard grade is required but cost sensitivity precludes higher-end references. The SOT-23 package offers space efficiency for compact designs. Consider the thermal performance at the upper end of the operating temperature range if high sink currents are sustained. Verify compatibility with the control loop stability requirements of the target power supply topology.

Part Context

This component belongs to the TL431 family of three-terminal shunt regulators produced by Nexperia. The family includes variants with different accuracy grades (Standard, A, B) and temperature ranges. The AFDT designation specifically indicates the A-grade accuracy level combined with the mirrored pinning configuration typical of the MFDT package style, though listed here under TO-236AB.

Replacement Considerations

Compatible substitutes include TL431BFDT,215 for lower accuracy requirements and TL431AMFDT,215 which shares the same electrical specifications but may differ in pinning orientation. Cross-brand equivalents such as the LM431 series offer similar functionality but require verification of pinout and parameter alignment.