TL431IDMR2G

Overview

The TL431IDMR2G is a programmable precision shunt regulator from onsemi, housed in an 8-MSOP package. It operates as a low temperature coefficient zener diode, providing a reference voltage adjustable from 2.495 V to 36 V using two external resistors. The device features a cathode current range of 1.0 mA to 100 mA and a typical dynamic impedance of 0.22 Ω. It exhibits a reference input voltage tolerance of ±2.2% at 25 °C and an equivalent full-range temperature coefficient of 50 ppm/°C. The component supports an operating ambient temperature range from -40 °C to +85 °C.

Feature Summary

• Programmable output voltage capability up to 36 V
• Temperature compensated for operation over the full rated operating temperature range
• Low output noise voltage characteristics
• Internally modified SOIC-8 package structure increasing power dissipation capability

Applications

• Digital voltmeters
• Power supplies
• Op amp circuitry
• Constant current sources
• Voltage monitors

Procurement Notes

Verify the specific suffix 'DM' corresponds to the Micro8 package variant when sourcing. Confirm that the ordering code matches the required tolerance grade and temperature range specifications. Ensure compatibility with surface mount assembly processes suitable for the specified package dimensions. Check for any specific automotive qualification requirements if the application demands AEC-Q100 compliance.

Selection Notes

Select this component when a stable, adjustable reference voltage is needed within a compact surface-mount footprint. Consider the ±2.2% initial accuracy and 50 ppm/°C temperature coefficient for precision requirements. Evaluate the 1.0 mA to 100 mA sink current capability against load demands. Verify stability boundary conditions regarding load capacitance and cathode current for the intended circuit topology.

Part Context

This device belongs to the TL431 family of three-terminal programmable shunt regulator diodes. It serves as a monolithic IC voltage reference designed to replace traditional zener diodes in various analog and digital circuits. The family includes variants with different tolerances and temperature ranges, such as the TL431A and TL431B series.

Replacement Considerations

TL431ACDR2G

FAQ

What is the internal structure modification of the DM suffix package?

Pins 2, 3, 6, and 7 are electrically common to the die attach flag, which increases power dissipation capability when mounted on a printed circuit board.

How is the output voltage programmed?

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