TL431BIDMR2

Overview

The TL431BIDMR2 is a three-terminal programmable shunt regulator diode from onsemi, part of the TL431 B series. It operates as a low temperature coefficient zener, programmable from Vref to 36 V using two external resistors. The device features a voltage reference tolerance of ±0.4% at 25°C and supports a sink current range of 1.0 mA to 100 mA. It exhibits a typical dynamic output impedance of 0.22 Ω and an equivalent full-range temperature coefficient of 50 ppm/°C. Designed for industrial applications, it functions within an ambient temperature range of -40°C to +85°C.

Feature Summary

• Programmable output voltage capability up to 36 V via external resistor divider
• High precision with ±0.4% initial voltage reference tolerance at 25°C
• Temperature compensated operation across the full rated industrial temperature range
• Low dynamic output impedance ensuring stable regulation under varying load conditions

Applications

• Feedback control for driving optocouplers in switching power supplies
• Digital voltmeters requiring stable reference voltages
• Op amp circuitry serving as precision voltage references
• Voltage monitoring circuits with defined upper and lower limits

Procurement Notes

Verify that the ordering suffix DMR2 corresponds to the Micro8 package (CASE 846A) and tape & reel shipping configuration. Confirm the 'B' designation indicates the 0.4% tolerance grade. Ensure the component meets RoHS compliance standards for lead-free packaging. Cross-reference the specific lot marking against the manufacturer's data sheet to validate assembly location and production week.

Selection Notes

Select this component when a precise, adjustable shunt reference is required in compact surface-mount designs. The Micro8 package offers space efficiency compared to standard SOIC-8 variants. Consider the 0.4% tolerance for high-accuracy analog front ends. Evaluate thermal dissipation requirements based on the junction-to-ambient resistance specified for the DM suffix package during continuous operation.

Part Context

This device belongs to the TL431 family of programmable precision references manufactured by onsemi. It utilizes monolithic IC technology to replace traditional discrete zener diodes, offering superior stability and adjustability. The TL431 series is widely integrated into power management systems where reliable voltage regulation and feedback sensing are critical for system performance.

Replacement Considerations

Compatible substitutes include TL431BCDMR2G and NCV431BDMR2G. Verify pinout compatibility and package dimensions before substitution. Ensure replacement parts meet the same electrical tolerances and operating temperature ranges.