TL431QDBZT

Overview

The TL431QDBZT is an automotive-grade, adjustable precision shunt regulator manufactured by Texas Instruments. It operates within a voltage range of 2.495V to 36V and supports a maximum cathode current of 100mA with a minimum operating current of 600µA. The device features an initial accuracy of 2% and a temperature coefficient of 92ppm/°C. Designed for robust performance in harsh environments, it functions reliably across an extended temperature range from -40°C to +125°C. Housed in a compact SOT-23-5 surface-mount package, this component serves as a high-stability reference for power management applications.

Feature Summary

• Automotive-grade qualification ensuring reliability under demanding thermal and electrical conditions
• Adjustable output voltage capability spanning from the internal reference threshold up to the maximum input limit
• High stability maintained through low temperature drift characteristics across the full operating range

Applications

• Automotive power supply regulation circuits
• Switching mode power supply feedback loops
• On-board voltage monitoring systems

Procurement Notes

Verify the specific suffix 'Q' confirms automotive grade status against the official datasheet. Confirm the 'DBZT' designation corresponds to the SOT-23-5 package and reel packaging format. Ensure the application environment strictly adheres to the specified -40°C to +125°C operating temperature limits. Cross-reference the pinout configuration to prevent integration errors during PCB assembly.

Selection Notes

Select this component when automotive reliability standards are mandatory for the design. Choose this part over commercial variants if the system operates in extreme temperature environments exceeding standard industrial limits. Consider the SOT-23-5 footprint constraints and the required 2% initial accuracy tolerance. Evaluate the 100mA current handling capacity against the circuit's peak load requirements.

Part Context

This device belongs to the TL431 family of programmable shunt regulators. It shares functional similarities with the TL432 but utilizes a distinct pinout arrangement suitable for the SOT-23-5 package. The Q-series designation indicates compliance with automotive quality standards, differentiating it from the standard commercial or industrial grades found in the broader product line.

Replacement Considerations

The TL431LI series offers improved stability and lower temperature drift as a direct pin-compatible alternative. Other compatible options include the TL431ACDBVT for commercial applications requiring tighter initial accuracy tolerances.