TL431AQDBVTG4

Overview

The TL431AQDBVTG4 is an adjustable precision shunt regulator manufactured by Texas Instruments, designed for automotive applications. It operates within a cathode voltage range of 2.495 V to 36 V and supports a maximum cathode current of 100 mA. The device features an initial accuracy of 1% and a maximum temperature coefficient of 92 ppm/°C. It functions over an extended industrial temperature range from -40°C to +125°C. The component is housed in a surface-mount SOT-23 package and is supplied in tape and reel packaging.

Feature Summary

• Automotive-grade qualification ensuring reliability in vehicle electronics environments
• Adjustable output voltage capability spanning from 2.495 V up to 36 V
• High precision regulation with 1% initial accuracy tolerance
• Extended thermal performance suitable for harsh operating conditions

Applications

• Automotive power supply regulation circuits
• Precision voltage reference sources in vehicle ECUs
• Feedback control loops in automotive DC-DC converters
• Battery management system monitoring interfaces

Procurement Notes

Verify the complete part number including the G4 suffix to confirm RoHS compliance and lead-free status. Ensure the automotive grade designation (AQ) matches the specific environmental requirements of the target application. Confirm the SOT-23 package variant aligns with the PCB footprint design specifications before finalizing procurement orders.

Selection Notes

Select this component when automotive reliability standards are mandatory alongside precise voltage regulation. The wide operating temperature range makes it suitable for under-hood or exterior electronic modules. Consider the 100 mA current limit when designing load circuits to ensure adequate headroom for stable operation without exceeding thermal or electrical ratings.

Part Context

This device belongs to the TL431 family of programmable shunt regulators, widely utilized for voltage referencing and feedback control. The AQ prefix denotes automotive qualification, distinguishing it from standard commercial variants. It serves as a critical passive-like active component in power management architectures requiring stable reference voltages across varying load and temperature conditions.

Replacement Considerations

Direct substitutes include the non-G4 version TL431AQDBVT. Other compatible options may include TL431ACDBVT for commercial grades or TL431AW5-7 from Diodes Incorporated, though automotive qualification must be verified separately for cross-manufacturer replacements.