TL431ILPRAG

Overview

The TL431ILPRAG is a three-terminal programmable shunt regulator diode manufactured by onsemi. It operates as a low temperature coefficient zener, programmable from Vref to 36 V using two external resistors. The device features a wide operating current range of 1.0 mA to 100 mA and a typical dynamic impedance of 0.22 Ω. It includes an internal 2.5 V reference, enabling stable voltage generation from standard logic supplies. The component supports operation over a full rated ambient temperature range of -40 °C to +85 °C.

Feature Summary

• Programmable output voltage capability up to 36 V
• Low dynamic output impedance for precise regulation
• Temperature compensated for full operating range stability

Applications

• Digital voltmeters
• Power supply feedback control
• Op amp circuitry
• Constant current sources

Procurement Notes

Verify the specific suffix 'ILPRAG' against the manufacturer's ordering information to confirm package style and shipping format. Confirm that the -40 °C to +85 °C temperature grade matches the design requirements. Check for any recent Product Change Notices (PCN) regarding assembly or material changes before finalizing procurement.

Selection Notes

Select this component when a precision shunt regulator with adjustable output is required. Ensure the cathode current remains within the 1.0 mA to 100 mA operational limits. Verify that the external resistor network provides the necessary voltage division for the target reference level. Consider thermal dissipation capabilities if operating near maximum ratings.

Part Context

This part belongs to the TL431 series of programmable precision references. It serves as a direct replacement for standard Zener diodes in applications requiring higher accuracy and lower temperature drift. The TO-92 package variant offers a compact solution for through-hole mounting in consumer and industrial electronics.

Replacement Considerations

Direct substitutes include other TL431 variants with matching tolerance and temperature grades, such as TL431AILPRAG or TL431BILPRAG. Cross-manufacturer equivalents like LM431 or KA431 may be considered if pin compatibility and electrical specifications align with the original design constraints.

FAQ

What is the minimum cathode current required for regulation?

The minimum cathode current for regulation is typically 1.0 mA.

How is the output voltage programmed?

The output voltage is programmable from Vref to 36 V using two external resistors connected between the cathode, reference, and anode pins.