TL431BMFDT/8R

Overview

The TL431BMFDT/8R is a three-terminal shunt adjustable precision voltage reference manufactured by Nexperia USA Inc. It belongs to the TL431 family, offering an output voltage range between Vref = 2.495 V and 36 V, settable via two external resistors. This specific variant features a B-grade reference voltage tolerance of 0.5%. It operates within an ambient temperature range of -40 °C to 125 °C and utilizes a mirrored pinning configuration in a SOT-23 (TO-236AB) package.

Feature Summary

• Programmable output voltage up to 36 V
• B-grade reference voltage tolerance of 0.5%
• Mirrored pinning configuration for SOT-23 packages
• Wide operating temperature range from -40 °C to 125 °C

Applications

• Shunt regulator circuits
• Precision current limiter designs
• Precision constant current sink applications
• Isolated feedback loops for Switch Mode Power Supplies (SMPS)

Procurement Notes

Verify the exact suffix /8R against official Nexperia documentation to confirm reel specifications or tape-and-reel dimensions. Ensure compatibility with automated pick-and-place equipment if using surface-mount assembly processes. Cross-reference the mirrored pinning configuration with schematic footprints to prevent installation errors during PCB design validation.

Selection Notes

Select this component when high accuracy is required, specifically where a 0.5% initial tolerance is necessary compared to standard grades. The mirrored pinning option facilitates layout flexibility in dense SOT-23 designs. Consider the wide temperature range for automotive or industrial environments requiring operation up to 125 °C.

Part Context

This part is part of the broader TL431 family of three-terminal shunt regulators. Variants are distinguished by tolerance grades (C, A, B), temperature ranges, and pinning configurations (normal vs. mirrored). The BMFDT designation indicates the B-grade tolerance, SOT-23 package, and mirrored pin arrangement.

Replacement Considerations

Compatible equivalents include other B-grade variants like TL431BFDT (normal pinning) or TL431BMFDT. For mirrored pinning requirements, ensure substitute parts maintain the same electrical characteristics and thermal performance.