TL431ACDMR2

Overview

The TL431ACDMR2 is a three-terminal programmable shunt regulator diode from onsemi, operating within the TL431 series. It functions as a low temperature coefficient zener reference, 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 an internal 2.5 V reference and operates over an ambient temperature range of 0°C to 70°C. Packaged in Micro8 (DM suffix), it offers ±1% voltage tolerance at 25°C.

Feature Summary

• Programmable output voltage capability up to 36 V via external resistor divider
• Temperature compensated operation across the full rated ambient temperature range
• Low dynamic output impedance for stable regulation performance
• Internal 2.5 V reference enables convenient generation of stable references from standard logic supplies

Applications

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

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and tolerance. Ensure the selected variant matches the required operating temperature range for the target application environment. Confirm RoHS compliance status if restricted substances are a constraint. Cross-reference the manufacturer part number with distributor databases to validate authenticity and availability before finalizing procurement decisions.

Selection Notes

Select this component when a precise, adjustable voltage reference is needed in a compact surface-mount form factor. The Micro8 package provides space efficiency while maintaining thermal performance suitable for general industrial applications. Consider the ±1% initial accuracy and 50 ppm/°C temperature coefficient for circuits requiring stable reference voltages without complex compensation networks.

Part Context

This device belongs to the TL431 family of programmable precision references manufactured by onsemi. The family includes variants with different tolerances, temperature ranges, and packages. The TL431ACDMR2 specifically utilizes the Micro8 package code DM, distinguishing it from SOIC or PDIP versions within the same electrical family.

Replacement Considerations

NCV431AIDMR2G

FAQ

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.

What is the minimum cathode current required for regulation?

The device requires a minimum cathode current of 1.0 mA to maintain proper regulation characteristics.