TL431CDMR2

Overview

The onsemi TL431CDMR2 is a three-terminal programmable shunt regulator diode housed in a Micro8 (DM) package. It operates as a low temperature coefficient Zener reference, programmable 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 voltage reference tolerance of ±2.2% and an equivalent full-range temperature coefficient of 50 ppm/°C. The operating ambient temperature range is specified from 0°C to +70°C.

Feature Summary

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

Applications

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

Procurement Notes

Verify the specific suffix 'DMR2' corresponds to the Micro8 tape and reel shipping configuration. Confirm the 'C' designation aligns with the required ±2.2% initial accuracy and the 0°C to +70°C operating temperature range for your design environment. Ensure the ordering part number matches the exact package and quantity requirements.

Selection Notes

Select this component when a precise, adjustable shunt reference is needed within a compact surface-mount footprint. The Micro8 package offers internal lead frame modifications that increase power dissipation capability compared to standard SOIC-8 variants. Consider the ±2.2% tolerance and 50 ppm/°C temperature coefficient against stricter precision requirements that might necessitate the 'A' or 'B' series variants.

Part Context

This device belongs to the TL431, A, B Series family of programmable precision references manufactured by onsemi. These monolithic ICs serve as direct replacements for traditional Zener diodes in various analog and digital applications. The family includes multiple packages such as SOIC-8, PDIP-8, TO-92, and Micro8, catering to diverse board space and thermal management needs.

Replacement Considerations

Compatible substitutes include TL431ACDMR2 and TL431BCDMR2 from onsemi, which offer tighter tolerances but share the same Micro8 package and pinout.