TLV431AIDBZR

Overview

The TLV431AIDBZR is a low-voltage, three-terminal adjustable voltage reference manufactured by Texas Instruments. It operates within an industrial and commercial temperature range with specified thermal stability. The output voltage is programmable between the internal reference of 1.24V and 6V using two external resistors. This device features a lower operating voltage compared to standard TL431 shunt regulators, making it suitable for 3V to 3.3V switch-mode power supplies. Key electrical parameters include a maximum series VREF input voltage of 7V, a maximum shunt current of 15mA, and an initial accuracy of 0.01%. It functions in SOT-23-3 packages with a temperature coefficient of 138 PPM/C.

Feature Summary

• Provides low-voltage operation suitable for modern low-power applications
• Offers high thermal stability across industrial and commercial temperature ranges
• Features active output circuitry for sharp turn-on characteristics
• Functions as a precise adjustable voltage reference via external resistors

Applications

• Isolated feedback circuits in 3V to 3.3V switch-mode power supplies
• Secondary side regulation in flyback SMPS designs
• Replacement for low-voltage Zener diodes in board-level regulation
• Voltage monitoring systems requiring precise reference levels
• Comparators with integrated reference capabilities

Procurement Notes

Verify the specific suffix 'DBZR' corresponds to the SOT-23-3 surface-mount package and reel packaging configuration. Confirm that the 'A' grade designation meets the required initial accuracy specifications for your design. Ensure compatibility with the intended operating temperature range of -40°C to +125°C. Cross-reference the datasheet version to confirm pinout consistency with existing PCB layouts.

Selection Notes

Select this component when designing circuits requiring a precision reference below the standard 2.5V threshold of traditional shunt regulators. It is ideal for applications where supply voltages are limited to 3V or 3.3V. Consider the 15mA maximum shunt current limit when sizing feedback networks. The SOT-23-3 package is optimal for space-constrained designs requiring surface-mount integration.

Part Context

This device belongs to the TLV431A family of low-voltage adjustable references. It serves as a direct functional upgrade to the legacy TL431 series, specifically addressing the needs of low-voltage digital and analog circuits. Unlike the TL431 which requires higher headroom, the TLV431A operates efficiently at lower potentials while maintaining comparable accuracy and stability profiles.

Replacement Considerations

TLV431AIDR is available in an 8-SOIC package offering equivalent electrical performance for through-hole or larger footprint designs.