TL431AIZ-AP

Overview

The TL431AIZ-AP is an adjustable shunt voltage reference from STMicroelectronics, part of the TL431 series. It provides a programmable output voltage ranging from 2.495 V to 36 V using two external resistors. The device features a typical dynamic impedance of 0.22 Ω and operates with a cathode current range of 1 mA to 100 mA. It offers initial accuracy options including ±1% and ±2%, with a temperature coefficient of 100 ppm/°C. The component supports through-hole mounting in a TO-92-3 package and functions within a temperature range of -40°C to +105°C.

Feature Summary

• Adjustable output voltage settable between 2.5 V and 36 V via external resistors
• High precision with ±1% initial accuracy option for tight tolerance applications
• Low dynamic output impedance of 0.22 Ω ensures stable regulation under varying load conditions
• Wide operating temperature range suitable for industrial environments

Applications

• Precision voltage references in power supply circuits
• Programmable linear regulators and DC-DC converter feedback loops
• Comparator reference voltage sources
• Battery charging circuit monitoring

Procurement Notes

Verify the specific suffix (e.g., AP) against the manufacturer's latest datasheet to confirm packaging type and exact electrical tolerances. Ensure the selected variant matches the required accuracy grade, as the TL431 family includes multiple precision levels. Confirm RoHS compliance status and lead times directly with authorized distributors or the manufacturer.

Selection Notes

Select this component when a low-cost, high-precision adjustable reference is needed in a through-hole package. The ±1% accuracy variant is suitable for applications requiring tighter voltage control compared to standard 2% versions. Consider the thermal performance and maximum cathode current limits relative to the specific circuit design requirements.

Part Context

The TL431 is a widely used three-terminal adjustable shunt regulator known for its versatility and cost-effectiveness. It serves as a drop-in replacement for Zener diodes in many applications, offering superior temperature stability and dynamic impedance. The TL431AIZ-AP specifically denotes the STMicroelectronics version in a TO-92-3 package with specific accuracy grading.

Replacement Considerations

Compatible substitutes include the TL431ACLPR from Texas Instruments, which shares similar electrical characteristics and pinout configurations. Verify that any replacement maintains the required accuracy grade and operating temperature range for the specific application.