TL431BQDBZRQ1

Overview

The TL431BQDBZRQ1 is an automotive-grade adjustable precision shunt regulator from Texas Instruments, designed for robust power management applications. It operates within a wide voltage range of 2.495 V to 36 V and delivers a maximum cathode current of 100 mA. The device features a tight initial accuracy of 0.5% and a low temperature coefficient of 82.5 ppm/°C, ensuring stable reference performance across varying thermal conditions. It is qualified under AEC-Q100 standards and functions reliably in temperatures ranging from -40°C to +125°C. Packaged in a compact SOT-23-3 surface-mount case, it supports efficient PCB layout for space-constrained designs.

Feature Summary

• Automotive qualification compliant with AEC-Q100 standards for enhanced reliability
• Adjustable output voltage capability spanning 2.495 V to 36 V
• High precision regulation with 0.5% initial accuracy tolerance
• Wide operating temperature range suitable for harsh automotive environments

Applications

• Automotive power supply regulation circuits
• Precision voltage reference sources in vehicle electronics
• Battery management system monitoring interfaces
• Isolated switching power supply feedback loops

Procurement Notes

Verify the complete part number including suffixes to ensure correct packaging and automotive qualification status. Confirm RoHS compliance requirements match project specifications. Check datasheet revisions for any updates to electrical characteristics or recommended operating conditions before finalizing design integration.

Selection Notes

Select this component when automotive reliability and high precision are required in limited space. The SOT-23-3 package offers a small footprint compared to larger alternatives. Ensure input voltage stays within the 36 V maximum limit and cathode current does not exceed 100 mA during operation to maintain specified accuracy and thermal performance.

Part Context

This device belongs to the TL431 family of adjustable shunt regulators, widely used as voltage references and error amplifiers. The 'Q1' suffix indicates automotive grade qualification, distinguishing it from standard commercial variants. It serves as a cost-effective solution for replacing discrete resistor networks in feedback paths while providing superior stability and temperature compensation.

Replacement Considerations

Compatible substitutes include TL431BQDBZRQ1 and TL431BQDBVRQ1. Verify pinout compatibility and electrical parameters such as initial accuracy and temperature coefficient before substitution.