TL431IDT

Overview

The TL431IDT is an adjustable shunt voltage reference manufactured by STMicroelectronics. It operates within a supply voltage range of 2.5 V to 36 V and supports a cathode current range from 1 mA to 100 mA. The device features a typical dynamic impedance of 0.22 Ω and offers initial accuracy options including ±1% and ±2%. It is housed in an 8-SOIC surface-mount package and is rated for operation between -40°C and +105°C.

Feature Summary

• Adjustable output voltage settable between 2.5 V and 36 V using two external resistors
• Guaranteed temperature stability across the entire operating temperature range
• Wide sink current capability ranging from 1 mA to 100 mA

Applications

• Precision voltage regulation in switching power supplies
• Reference voltage source for analog-to-digital converters
• Feedback control loops in linear regulators

Procurement Notes

Verify the specific suffix (IDT) against the manufacturer's official datasheet to confirm the exact tolerance grade, as variations exist within the TL431 family. Ensure the selected component meets the required thermal and electrical specifications for the target application environment before finalizing procurement.

Selection Notes

Select this component when a stable, adjustable reference voltage is required in a compact surface-mount form factor. Consider the ±1% or ±2% precision variants based on circuit requirements. Verify that the 8-SOIC package dimensions fit the PCB layout constraints and that the operating temperature range aligns with system conditions.

Part Context

The TL431 series represents a widely adopted standard for programmable shunt voltage references. The IDT variant specifically denotes the STMicroelectronics manufacturing version in an 8-SOIC package. This component serves as a fundamental building block for feedback networks in power management circuits requiring precise voltage monitoring.

Replacement Considerations

Compatible alternatives include the TS2431 for space-constrained SOT23-3L applications and the TS431 for low-voltage operations below 6 V. Cross-reference with industry-standard equivalents like the TL431AIDR or LM4040 if pinout compatibility and similar electrical characteristics are required.