TL431AIDM

Overview

The TL431AIDM is a precision programmable three-terminal shunt voltage regulator manufactured by Microsemi Corporation. It operates within an ambient temperature range of -40°C to +85°C and features an initial voltage reference accuracy of 1%. The device provides an adjustable output voltage from 2.5V to 36V using two external resistors. It supports a cathode sink current capability ranging from 1mA to 100mA, with a typical dynamic impedance of less than 200mΩ. The component is housed in an 8-pin Plastic SOIC surface-mount package.

Feature Summary

• Precision adjustable three-terminal shunt voltage regulation
• Low output noise and low output dynamic impedance
• Direct pin-to-pin replacement for industry standard TL431

Applications

• Feedback path of switching power supplies
• Overvoltage protection (OVP) crowbar circuits
• Reference source for A/D and D/A converters

Procurement Notes

Verify the manufacturer designation as Microsemi Corporation on official documentation. Confirm the specific suffix IDM corresponds to the 8-pin Plastic SOIC package and the -40°C to +85°C operating temperature range. Ensure compliance with RoHS requirements if applicable to the specific production lot. Check datasheet revision history for any updates to electrical characteristics or thermal data before finalizing procurement specifications.

Selection Notes

Select this component when a precise, adjustable shunt regulator is required for feedback loops or voltage referencing. The 1% initial accuracy suits applications demanding tighter tolerance than standard TL431 variants. Consider the 8-pin SOIC package for surface-mount assembly constraints. Verify that the required cathode current falls within the 1mA to 100mA operational window and that the system voltage does not exceed the 37V absolute maximum rating.

Part Context

This device belongs to the TL431/TL431A/TL431B series of precision programmable references. It is designed to be pin-compatible with industry-standard equivalents, facilitating direct upgrades or replacements in existing designs. The 'A' designation indicates a tighter initial voltage accuracy compared to the base 'C' variant, while the 'I' suffix denotes industrial temperature grade operation.

Replacement Considerations

The datasheet specifies direct pin-to-pin replacement for the industry standard TL431 and TL1431.