TL431AIDBZR

Overview

The TL431AIDBZR is a precision adjustable shunt regulator manufactured by Texas Instruments, housed in a compact SOT-23-3 surface-mount package. It operates within an output voltage range of 2.495V to 36V, set via external resistors. The device features an initial accuracy of ±1% and supports a cathode current range from 1mA to 100mA. It functions with a minimum input voltage of 2.7V and withstands a maximum input voltage of 37V. The component is rated for operation between -40°C and +85°C, offering stable performance for voltage reference and regulation tasks.

Feature Summary

• Provides precise programmable voltage reference across a wide output range using two external resistors
• Features low output impedance for effective noise filtering and stable regulation
• Offers sharp turn-on characteristics suitable for direct replacement of Zener diodes
• Ensures thermal stability with specified temperature coefficients over industrial ranges

Applications

• Secondary side regulation in flyback switch-mode power supplies
• Isolated feedback circuits for 3V to 3.3V switching power sources
• On-board voltage stabilization and adjustable power supply designs
• Voltage monitoring systems requiring precise threshold detection

Procurement Notes

Verify the specific suffix 'DBZR' corresponds to the SOT-23-3 tape-and-reel packaging configuration required for automated assembly processes. Confirm that the ±1% accuracy grade meets the strict tolerance requirements of the target circuit design. Ensure compatibility with the intended operating temperature range of -40°C to +85°C for the final application environment before procurement.

Selection Notes

Select this component when a high-precision, low-cost adjustable reference is needed in space-constrained designs. It serves as a superior alternative to standard Zener diodes due to its lower dynamic impedance and sharper conduction characteristics. Consider the TLV431 series if the application requires operation at voltages below 2.5V or demands extended temperature ranges beyond the standard industrial limits.

Part Context

This device belongs to the widely adopted TL431 family of three-terminal adjustable shunt regulators. It shares functional similarities with the TL1431 but offers improved performance metrics including tighter initial accuracy and enhanced thermal stability. The SOT-23-3 packaging allows for efficient PCB layout in modern consumer electronics and industrial control systems where board space is limited.

Replacement Considerations

The TLV431AIDBZR serves as a compatible substitute for applications requiring lower minimum operating voltages. For pin-compatible replacements with identical electrical specifications, verify availability of equivalent shunt regulators from other manufacturers ensuring matching accuracy grades and package dimensions.