TL431IDR2

Overview

The TL431IDR2 is a three-terminal programmable shunt regulator diode manufactured by onsemi. It operates as a low temperature coefficient zener, providing an adjustable output voltage range from the internal reference of 2.5 V up to 36 V using two external resistors. The device features a wide operating current range of 1.0 mA to 100 mA and exhibits a typical dynamic impedance of 0.22 Ω. It offers a reference tolerance of ±2.2% at 25°C and an equivalent full-range temperature coefficient of 50 ppm/°C. Designed for industrial applications, it supports an operating ambient temperature range of -40°C to +85°C.

Feature Summary

• Programmable output voltage capability extending from the internal 2.5 V reference up to 36 V via external resistor networks.
• Low dynamic output impedance characteristic ensuring stable regulation performance across the specified operating current range.
• Temperature compensated operation designed to maintain accuracy over the full rated industrial ambient temperature range.

Applications

• Digital voltmeters
• Power supplies
• Op amp circuitry

Procurement Notes

Verify that the ordering suffix matches the required package type and shipping configuration. Confirm the specific tolerance grade aligns with design requirements. Ensure the operating temperature range meets application constraints. Check RoHS compliance status if environmental regulations apply. Validate pinout compatibility during integration planning.

Selection Notes

Select this component when a precision shunt regulator is needed for feedback control or reference generation. Consider the ±2.2% initial accuracy and 50 ppm/°C temperature coefficient for stability requirements. Evaluate the cathode current range to ensure proper biasing within the 1 mA to 100 mA limits. Assess thermal resistance values for heat dissipation needs in the SOIC-8 package.

Part Context

This device belongs to the TL431, A, B series of programmable precision references. It serves as a monolithic IC voltage reference alternative to discrete zener diodes. The family includes variants with different tolerances and temperature ranges, such as the TL431ACDR2G and TL431BCDR2G, offering flexibility for various precision applications.

Replacement Considerations

TL431IDR2G is the lead-free version of this component. NCV431AIDR2G is available for automotive and other applications requiring site and change control. Verify pinout and electrical characteristics match before substitution.

FAQ

What is the minimum cathode current required for regulation?

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

How is the output voltage programmed?

The output voltage is programmable from Vref to 36 V using two external resistors connected to the reference input.