TL431IDR2G

Overview

The TL431IDR2G is a programmable precision shunt regulator from onsemi, housed in an SOIC-8 package. It operates as a low temperature coefficient zener diode with an adjustable reference voltage range from Vref to 36 V. The device supports a cathode current range of 1.0 mA to 100 mA and features a typical dynamic impedance of 0.22 Ω. It exhibits a reference input tolerance of ±2.2% at 25 °C and a full-range temperature coefficient of 50 ppm/°C. The component functions effectively as a positive or negative voltage reference.

Feature Summary

• Programmable output voltage capability up to 36 V using two external resistors
• Low dynamic output impedance for stable regulation performance
• Temperature compensated operation across the rated ambient temperature range
• Low output noise voltage characteristics suitable for precision applications

Applications

• Digital voltmeters requiring stable reference voltages
• Power supply feedback control circuits driving optocouplers
• Op amp circuitry utilizing precise voltage references
• Constant current sources and sinks
• Voltage monitor circuits with defined threshold limits

Procurement Notes

Verify the specific suffix 'I' indicates the ±2.2% tolerance grade and -40°C to +85°C operating range. Confirm the 'DR2G' suffix corresponds to the SOIC-8 tape and reel packaging format. Ensure compatibility with RoHS compliance requirements for the target assembly process. Cross-reference the ordering information table to validate shipping quantities and package codes against current production status.

Selection Notes

Select this component when a shunt regulator with ±2.2% initial accuracy is sufficient for the application design. The SOIC-8 surface mount package facilitates automated PCB assembly processes. Consider the 100 mA sink current capability for load requirements within the specified operating temperature range. Evaluate stability boundary conditions if significant load capacitance is present in the circuit design.

Part Context

This device belongs to the TL431 family of programmable precision references manufactured by onsemi. The 'I' designation specifies the industrial temperature grade and standard tolerance variant within the series. It serves as a monolithic replacement for traditional Zener diodes in various power management and signal conditioning roles.

Replacement Considerations

TL431ACDR2G

FAQ

What is the minimum cathode current required for regulation?

The minimum cathode current for regulation is 1.0 mA when VKA equals Vref.

How is the reference voltage programmed?

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