TL431AIDMR2

Overview

The TL431AIDMR2 is a programmable precision shunt regulator from onsemi, housed in a Micro8 (DM) package. It operates as a low temperature coefficient zener diode with an adjustable reference voltage range from 2.5 V to 36 V using two external resistors. The device supports a cathode current range of 1.0 mA to 100 mA and features a typical dynamic impedance of 0.22 Ω. It offers a reference tolerance of ±1.0% and a full-range temperature coefficient of 50 ppm/°C. The component functions effectively within an ambient temperature range of -40°C to +85°C.

Feature Summary

• Programmable output voltage capability extending up to 36 V via external resistor networks
• Temperature compensated operation ensuring stability across the full rated operating temperature range
• Low dynamic output impedance providing precise regulation characteristics
• Internal compensation for stable performance in feedback control applications

Applications

• Feedback control for driving optocouplers in power supply circuits
• Digital voltmeter reference sources
• Op amp circuitry requiring stable voltage references
• Constant current source implementations
• Voltage monitor threshold detection

Procurement Notes

Verify that the ordering suffix DM corresponds to the Micro8 package configuration required for the design. Confirm the specific tolerance grade A aligns with the ±1.0% accuracy requirements. Ensure the thermal management strategy accounts for the junction-to-ambient resistance specified for this plastic package type during high-current operation.

Selection Notes

Select this component when a programmable shunt regulator is needed with a wide voltage adjustment range. Consider the Micro8 package size constraints against available PCB real estate. Evaluate the 1.0 mA minimum cathode current requirement to ensure proper regulation under light load conditions. Verify compatibility with the intended operating temperature range for industrial or automotive environments.

Part Context

This part belongs to the TL431, A, B series of programmable precision references manufactured by onsemi. These devices are designed as replacements for traditional zener diodes in various analog and digital circuits. The series includes multiple tolerance grades and package options to support diverse application needs across consumer, industrial, and automotive sectors.

Replacement Considerations

NCV431AIDMR2 serves as an automotive-grade equivalent within the same family. Standard TL431 variants may differ in tolerance specifications or package dimensions. Verify pinout compatibility and electrical parameter overlaps before substituting with other programmable shunt regulators.