TL431BCDBVR

Overview

The TL431BCDBVR is an adjustable precision shunt regulator manufactured by Texas Instruments, housed in a surface-mount SOT-23-5 package. It provides an adjustable output voltage range from 2.495 V to 36 V using two external resistors. The device features an initial accuracy tolerance of ±0.5% at 25°C and supports a maximum cathode current of 100 mA with a minimum operating current of 600 µA. It operates within a temperature range of 0°C to 70°C and exhibits a typical temperature coefficient of 92 ppm/°C.

Feature Summary

• Provides precise adjustable reference voltage functionality via external resistor network
• Delivers high initial accuracy with ±0.5% tolerance at room temperature
• Features low output impedance for stable regulation performance
• Offers explicit turn-on characteristics suitable for replacing Zener diodes

Applications

• Board-level voltage regulation circuits
• Adjustable power supply designs
• Switching power supply feedback loops

Procurement Notes

Verify the specific suffix 'BQ' or 'BC' against the required datasheet revision, as these indicate distinct accuracy grades and thermal specifications. Confirm that the SOT-23-5 package matches the PCB footprint requirements. Ensure the commercial temperature range (0°C to 70°C) aligns with the operational environment constraints of the target application before finalizing procurement.

Selection Notes

Select this component when a compact surface-mount solution is required for precision voltage referencing. The ±0.5% accuracy makes it suitable for applications demanding tighter tolerances than standard Zener diodes. Consider the 100 mA current capability for driving load requirements directly or through feedback networks. Verify that the commercial temperature range meets the system's environmental needs.

Part Context

This part belongs to the TL431 family of three-terminal adjustable shunt regulators produced by Texas Instruments. The family is widely recognized for providing thermal stability across various industrial and commercial applications. The TL431 series serves as a versatile alternative to traditional Zener diodes, offering superior adjustability and precision in power management integrated circuit designs.

Replacement Considerations

Compatible pinout alternatives include the TL431ACDBVR and TL431CDBVR, though these offer lower accuracy grades of ±1% and ±2% respectively. Verify that any substitute maintains the SOT-23-5 package and sufficient current handling capabilities for the specific circuit design.