TL431CDMR2G

Overview

The onsemi TL431CDMR2G is a three-terminal programmable shunt regulator diode housed in an 8-pin Micro8 package. It operates as a low temperature coefficient zener, providing a reference voltage of 2.495 V at 25 °C with a tolerance of ±2.2%. The device supports a cathode current range from 1.0 mA to 100 mA and allows for programmable output voltages up to 36 V using two external resistors. It features a typical dynamic impedance of 0.22 Ω and an equivalent full-range temperature coefficient of 50 ppm/°C. The component functions effectively as a positive or negative voltage reference.

Feature Summary

• Programmable precision reference utilizing two external resistors to set output voltage
• Temperature compensated operation across the rated ambient temperature range
• Low dynamic output impedance ensuring stable regulation performance
• Internal latch-up protection exceeding JEDEC standards

Applications

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

Procurement Notes

Verify the specific suffix 'DMR2G' corresponds to the Micro8 package configuration required for your design. Confirm that the ±2.2% initial accuracy meets your system's tolerance requirements. Ensure the operating temperature range aligns with your application environment. Check for any recent Product Change Notifications regarding manufacturing sites or materials.

Selection Notes

Select this component when a precise, adjustable voltage reference is needed within a compact surface-mount footprint. The Micro8 package offers internal lead frame modifications to enhance power dissipation compared to standard SOIC-8 variants. Consider the ±2.2% tolerance if higher precision is not critical, or choose the B series for tighter tolerances. Verify stability boundary conditions for your specific load capacitance and cathode current settings.

Part Context

This device belongs to the TL431A, B Series family of programmable precision references manufactured by onsemi. The TL431 architecture serves as a versatile replacement for traditional Zener diodes in various analog and digital circuits. The Micro8 variant provides a modified internal structure for improved thermal performance while maintaining standard external dimensions.

Replacement Considerations

TL431ACDMR2G

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 the reference voltage up to 36 V using two external resistors connected between the cathode, reference, and anode pins.