TL431BCDBZR-QR

Overview

The TL431BCDBZR-QR is a three-terminal shunt regulator from Nexperia, classified as a voltage reference within the PMIC category. It operates in the TO-236AB (SOT-23) package and is AEC-Q101 qualified for automotive reliability. The device features a programmable output voltage range between Vref = 2.495 V and 36 V, set by two external resistors. It offers a B-Grade reference voltage tolerance of 0.5% and supports a sink current capability ranging from 1 mA to 100 mA.

Feature Summary

• Programmable output voltage adjustable via external resistors up to 36 V
• B-Grade reference voltage tolerance ensuring high precision
• AEC-Q101 qualification for automotive application suitability

Applications

• Shunt regulator circuits
• Precision constant current sinks
• Isolated feedback loops for Switch Mode Power Supplies (SMPS)

Procurement Notes

Verify component authenticity through official Nexperia channels or authorized distributors. Confirm the specific suffix -QR indicates reel packaging. Ensure the AEC-Q101 grade matches project requirements. Check datasheet revisions for any pinning or electrical parameter updates before finalizing designs.

Selection Notes

Select this part when a 0.5% tolerance reference is required in an SOT-23 package. It serves as a direct replacement for standard TL431 variants where automotive qualification is mandatory. Consider thermal performance and sink current limits relative to the specific circuit load requirements.

Part Context

This component belongs to the TL431 family of three-terminal shunt regulators. It shares functional similarities with TL431ACDBZR-QR and TL431IDBZR-QR but differs in reference voltage tolerance grades. The -Q suffix denotes automotive qualification, while -R indicates tape and reel packaging format.

Replacement Considerations

TL431ACDBZR-QR offers 1.0% tolerance. TL431IDBZR-QR provides standard 2.0% tolerance. Both maintain the same package and automotive qualification.