TLV431IDBZR

Overview

The TLV431IDBZR is a low-voltage, three-terminal adjustable precision shunt regulator manufactured by Texas Instruments. It operates within an industrial temperature range of -40°C to +85°C and features a reference voltage (VREF) of 1.24V. The output voltage is adjustable between VREF and 6V using two external resistors. Key electrical parameters include a maximum cathode current of 15 mA, a minimum operating current of 80 µA, and a maximum supply voltage of 7 V. The device offers an initial accuracy of 1% and a temperature coefficient of 138 ppm/°C. It is housed in a compact SOT-23-3 surface-mount package.

Feature Summary

• Provides precise voltage regulation with 1% initial accuracy for stable reference applications
• Features low minimum operating current of 80 µA suitable for energy-efficient designs
• Offers adjustable output voltage range from 1.24V to 6V via external resistor divider
• Designed for low-voltage operation with a maximum supply voltage of 7 V

Applications

• Adjustable voltage and current references
• Secondary-side regulation in flyback switch-mode power supplies (SMPS)
• Zener diode replacement in board-level voltage regulation
• Voltage monitoring circuits
• Comparators with integrated reference

Procurement Notes

Verify the specific suffix 'I' indicates the industrial temperature grade (-40°C to +85°C), distinct from the commercial 'A' variant. Confirm the 'DBZR' suffix corresponds to the SOT-23-3 package and tape-and-reel delivery format. Ensure compatibility with RoHS standards and check for any recent product change notices affecting marking or sourcing.

Selection Notes

Select this component when a low-voltage, high-precision shunt regulator is required for industrial environments. The 1% accuracy and 138 ppm/°C temperature coefficient make it suitable for applications demanding stable reference voltages over wide thermal ranges. Consider the 15 mA cathode current limit for load requirements and ensure the SOT-23-3 footprint fits the PCB layout constraints.

Part Context

The TLV431 series serves as a low-voltage alternative to traditional TL431 regulators, enabling operation in 3V to 3.3V systems. The 'I' designation specifies the industrial temperature range, while 'DBZR' denotes the SOT-23-3 surface-mount package with reel packaging. This part belongs to the broader family of adjustable precision shunt regulators designed for isolated feedback and general-purpose voltage referencing.

Replacement Considerations

TLV431AIDBZR: Commercial grade variant (-40°C to +85°C vs. Industrial). Verify if the temperature range difference impacts the specific application environment.