TLV431CDBZR

Overview

The TLV431CDBZR is a low-voltage, three-terminal adjustable voltage reference manufactured by Texas Instruments. It functions as a precision shunt regulator with an internal reference voltage of 1.24V. The output voltage is programmable between VREF and 6V using two external resistors. This device operates within an industrial temperature range of -40°C to +85°C. Key electrical specifications include a maximum cathode current of 15 mA, a minimum operating current of 80 µA, and an initial accuracy of ±1.5%. It features a typical dynamic output impedance of 0.25Ω and is housed in a SOT-23-3 surface-mount package.

Feature Summary

• Provides precise voltage regulation suitable for low-voltage applications
• Offers adjustable output voltage via external resistor network
• Features low dynamic output impedance for stable performance
• Designed as a direct replacement for standard Zener diodes

Applications

• Adjustable voltage and current references
• Secondary side regulation in flyback switch-mode power supplies
• Voltage monitoring circuits
• Comparator applications with integrated reference

Procurement Notes

Verify the specific suffix 'C' indicates the ±1.5% initial accuracy grade when sourcing. Confirm the 'DBZR' suffix corresponds to the SOT-23-3 package and reel packaging format. Ensure the component meets the required industrial temperature range specifications for your application environment before finalizing procurement.

Selection Notes

Select this component when a low-cost, adjustable shunt regulator is needed for 3V to 3.3V systems. It serves as a superior alternative to traditional Zener diodes due to lower operating voltage and better stability. Consider the ±1.5% accuracy tolerance against tighter requirements like the 'A' or 'B' grades if higher precision is necessary for the design.

Part Context

This part belongs to the TLV431 family of low-voltage adjustable precision shunt regulators from Texas Instruments. It shares functional similarities with the legacy TL431 but operates at significantly lower voltages. The family includes variants with different accuracy grades (A, B, C) and automotive qualifications (Q1), all utilizing the same core reference architecture.

Replacement Considerations

Direct substitutes include TLV431ACDBZR and TLV431BCDBZR for higher accuracy needs. For general purpose replacement, TLV431IDBZR may be considered if wider tolerance is acceptable.