TL431IZ-AP

Overview

The TL431IZ-AP is an adjustable shunt voltage reference manufactured by STMicroelectronics, housed in a TO-92-3 through-hole package. It provides an output voltage range from 2.5 V to 36 V, set via two external resistors. The device features a typical dynamic impedance of 0.22 Ω and operates with a sink current capability between 1 mA and 100 mA. It offers initial accuracy options including ±1% and ±2%, with a temperature coefficient of 100 PPM/°C for the standard variant. The component supports an operating temperature range from -40°C to +105°C.

Feature Summary

• Adjustable output voltage programmable between 2.5 V and 36 V using external resistors
• Guaranteed temperature stability across the entire specified operating range
• Wide cathode current operating range supporting 1 mA to 100 mA sink capability

Applications

• Precision voltage regulation in power supply circuits
• Temperature compensation applications requiring stable reference points
• Linear regulator feedback loops for voltage control

Procurement Notes

Verify the specific suffix code against the manufacturer's latest documentation to confirm tolerance grades and automotive qualification status. Ensure the ordering part number matches the required precision level, as variations exist within the TL431 family. Confirm RoHS compliance and packaging type requirements prior to procurement to align with assembly specifications.

Selection Notes

Select this component when a low-cost, high-stability shunt reference is required for linear regulation or feedback networks. Consider the ±1% or ±2% accuracy variants based on circuit sensitivity requirements. Verify that the thermal management strategy accommodates the specified operating temperature range and power dissipation limits inherent to the TO-92 package.

Part Context

This component belongs to the TL431 series of programmable shunt voltage references, widely used in analog and mixed-signal electronics. The TL431 family serves as a versatile alternative to Zener diodes, offering superior temperature stability and lower dynamic impedance. It is commonly integrated into switching power supplies, battery chargers, and industrial control systems where precise voltage monitoring is essential.

Replacement Considerations

Compatible substitutes include the TL431ACZ and TL431ACLPR from Texas Instruments, which share similar electrical characteristics and pin configurations. Verify pinout compatibility and tolerance grades before substitution to ensure circuit performance remains within design specifications.