TLV431BQFTA

Overview

The TLV431BQFTA is an automotive-compliant, three-terminal adjustable shunt regulator manufactured by Diodes Incorporated. It provides a reference voltage of 1.24V with an initial tolerance of 0.5%. The device supports an adjustable output voltage range from 1.24V to 18V and handles a continuous cathode current up to 15mA. It operates within an ambient temperature range of -40°C to +125°C and is qualified to AEC-Q100 Grade 1 standards. The component is housed in a surface-mount SOT-23 package.

Feature Summary

• Offers high-accuracy voltage regulation with a 0.5% initial tolerance band for the B grade.
• Qualified for automotive applications under AEC-Q100 Grade 1 specifications.
• Provides excellent temperature stability across the full industrial operating range.
• Supports low-voltage operation with a precise 1.24V internal reference.

Applications

• Replacing Zener diodes where improved performance and accuracy are required
• Adjustable linear voltage regulators
• High-current shunt regulators using external transistor amplification
• Increasing output voltage of fixed linear regulators

Procurement Notes

Verify that the specific part number matches the required 0.5% tolerance grade (B) and the SOT-23 package configuration. Confirm AEC-Q100 Grade 1 qualification requirements are met for the target automotive application. Ensure the ordering suffix corresponds to the Tape and Reel packaging format specified in the manufacturer's documentation.

Selection Notes

Select this component when a precision adjustable shunt regulator is needed for automotive environments. The 0.5% tolerance offers higher accuracy than standard grades. Consider the maximum 15mA cathode current limit; use external transistors if higher load currents are necessary. Verify that the SOT-23 package dimensions fit the PCB layout constraints.

Part Context

This component belongs to the TLV431Q family of automotive-compliant shunt regulators. It shares the same core functionality as other variants but is distinguished by its specific 0.5% tolerance band and SOT-23 packaging. The 'Q' suffix indicates automotive qualification, while 'B' denotes the tolerance grade.

Replacement Considerations

TLV431AQFTA (1% tolerance)

FAQ

What is the minimum cathode current required for regulation?

The minimum cathode current for regulation is typically 55µA to 80µA depending on the temperature range.

How is the output voltage determined?

The output voltage is set between 1.24V and 18V by selecting two external divider resistors connected to the reference pin.