TL431AIDT

Overview

The TL431AIDT is a programmable shunt voltage reference manufactured by STMicroelectronics, housed in an 8-pin SOIC surface-mount package. It provides an adjustable output voltage ranging from 2.5 V to 36 V, set via two external resistors. The device features an initial accuracy of ±1% and operates with a cathode current range of 1 mA to 100 mA. It exhibits a typical dynamic impedance of 0.22 Ω and maintains guaranteed temperature stability across an operating temperature range of -40°C to +105°C.

Feature Summary

• Adjustable output voltage capability between 2.5 V and 36 V using external resistors
• High precision with ±1% initial accuracy tolerance
• Wide sink current range supporting operation from 1 mA to 100 mA
• Guaranteed temperature stability over the full industrial operating range

Applications

• Precision power supply regulation circuits
• Industrial control system voltage references
• Optocoupler driver interfaces for feedback loops
• Portable equipment power management

Procurement Notes

Verify the specific suffix 'DT' confirms the 8-SOIC package configuration during procurement. Ensure the order quantity aligns with standard manufacturing packaging formats. Confirm that the ±1% accuracy grade meets the design requirements, as other grades like 'B' offer tighter tolerances. Validate that the thermal performance within the -40°C to +105°C range suits the target application environment.

Selection Notes

Select the TL431AIDT when a surface-mount solution is required for space-constrained designs. Choose this part over through-hole variants if PCB real estate is limited. Consider the ±1% accuracy sufficient for general-purpose regulation; select the 'B' variant only if stricter tolerance is necessary. Verify that the 36 V maximum input voltage covers the highest expected circuit potential.

Part Context

This component belongs to the TL431 family of programmable shunt voltage references. It serves as a direct replacement for generic TL431 devices while offering STMicroelectronics-specific manufacturing standards. The device integrates a bandgap reference and error amplifier to provide stable voltage regulation. It is widely used in switching power supplies and linear regulators where precise voltage monitoring is essential.

Replacement Considerations

Compatible substitutes include the TL431ACDT and TL431BCDT from STMicroelectronics, which share the same SO-8 package but differ in accuracy grades. Cross-brand equivalents such as the LM431AIMX/NOP4 or REF33xx series may function similarly but require verification of pinout compatibility and electrical characteristics against the original datasheet.