TL431ACDBZR

Overview

The TL431ACDBZR is a programmable shunt regulator from Texas Instruments, housed in a surface-mount SOT-23 package. It operates with an adjustable output voltage range spanning from 2.495V to 36V. The device features an initial accuracy of ±1% and a maximum temperature coefficient of 92 ppm/°C. It supports a cathode current range of 1mA to 100mA and withstands a maximum input voltage of 37V. Operating temperatures extend from 0°C to +70°C.

Feature Summary

• Provides precise voltage regulation through external resistor setting
• Offers low output impedance for stable performance
• Features sharp turn-on characteristics as a Zener diode alternative

Applications

• On-board voltage regulation
• Adjustable power supplies
• Switching power supply circuits

Procurement Notes

Verify the specific suffix 'ACDBZR' against official datasheets to confirm the ±1% accuracy grade and SOT-23-3 packaging variant. Ensure compatibility with the required operating temperature range of 0°C to +70°C for the intended application environment before finalizing procurement decisions.

Selection Notes

Select this component when a compact, adjustable shunt reference is required within standard commercial temperature limits. The ±1% tolerance suits applications demanding higher precision than standard Zener diodes. Verify that the 100mA cathode current capability meets the load requirements of the target circuit design.

Part Context

This part belongs to the TL431 series of programmable shunt regulators. It serves as a direct replacement for fixed voltage references in many designs, offering flexibility through external resistance networks. The SOT-23 form factor allows for space-constrained PCB layouts compared to larger through-hole packages.

Replacement Considerations

Check pinout compatibility with legacy TO-92 or SOIC versions if replacing existing designs. Verify thermal management requirements remain within the specified 0°C to +70°C operational window for equivalent performance.