TL431AIDR2

Overview

The TL431AIDR2G is a three-terminal programmable shunt regulator IC from onsemi, housed in an SOIC-8 package. It operates as a low temperature coefficient zener diode, providing a reference voltage adjustable from Vref to 36 V using two external resistors. The device supports a cathode current range of 1.0 mA to 100 mA with a typical dynamic impedance of 0.22 Ω. It features a reference input tolerance of ±1% and an equivalent full-range temperature coefficient of 50 ppm/°C. The component functions effectively as both a positive and negative voltage reference.

Feature Summary

• Programmable output voltage capability up to 36 V
• Temperature compensated for operation over the full rated operating temperature range
• Low output noise voltage characteristics
• Sink current capability ranging from 1.0 mA to 100 mA

Applications

• Digital voltmeters
• Power supplies
• Op amp circuitry
• Feedback control for driving optocouplers
• Constant current sources

Procurement Notes

Verify the specific suffix 'DR2' corresponds to the tape and reel shipping configuration rather than rail packaging. Confirm that the 'A' designation aligns with the required ±1% initial accuracy specification for your design. Ensure the SOIC-8 package dimensions match your PCB footprint requirements before finalizing procurement orders.

Selection Notes

Select this component when a stable, adjustable reference voltage is needed within the 2.5 V to 36 V range. It serves as a direct replacement for standard zener diodes in precision applications. Consider the thermal resistance and power dissipation limits if operating near maximum current ratings or elevated ambient temperatures.

Part Context

This device belongs to the TL431 family of programmable precision references manufactured by onsemi. The family includes variants with different tolerances (B series) and extended temperature ranges (NCV prefix). The TL431A specifically denotes the 1% accuracy grade, suitable for general-purpose precision regulation tasks requiring stability across varying load conditions.

Replacement Considerations

TL431ACDR2G

FAQ

Can the TL431AIDR2G be used as a negative voltage reference?

Yes, because it operates as a shunt regulator, it can be configured to function as either a positive or negative voltage reference.

What is the minimum cathode current required for regulation?

The minimum cathode current for regulation is typically 1.0 mA.