TL431BCDBZR

Overview

The TL431BCDBZR is an adjustable precision shunt regulator from Texas Instruments, housed in a SOT-23-3 surface-mount package. It provides an output voltage range of 2.495 V to 36 V with an initial accuracy of ±0.5%. The device supports a maximum cathode current of 100 mA and has a minimum operating current of 600 µA. It operates within a temperature range of 0°C to 70°C, featuring a typical temperature coefficient of 92 ppm/°C. The maximum input voltage is rated at 37 V.

Feature Summary

• Provides precise adjustable voltage reference functionality via a three-terminal shunt regulator topology.
• Delivers high initial accuracy of ±0.5% for stable reference performance across the operating range.
• Supports wide output voltage adjustment from 2.495 V up to 36 V using external resistor networks.

Applications

• Precision voltage references in power supply circuits
• Programmable linear and switching regulators
• Voltage monitoring and control systems

Procurement Notes

Verify the specific suffix 'G4' if RoHS compliance documentation is required, as it indicates lead-free status. Confirm the package type matches the design requirement, as other variants exist in different footprints. Ensure the operating temperature range aligns with the application environment, as this specific part is rated for commercial temperatures only.

Selection Notes

Select this component when a compact surface-mount solution is needed for adjustable voltage referencing. The ±0.5% accuracy suits applications requiring tighter tolerances than standard bandgap references. Consider the thermal coefficient and operating temperature limits to ensure stability under varying environmental conditions compared to higher-grade automotive or industrial variants.

Part Context

This part belongs to the TL431 family of programmable shunt regulators, widely used as a low-cost alternative to Zener diodes. It functions similarly to a two-transistor feedback loop, allowing for precise voltage setting. The BCDBZR variant specifically denotes the commercial grade with ±0.5% accuracy in the small SOT-23 package.

Replacement Considerations

• TL431ACDBZRG4
• TL431AIDBZR

FAQ

What is the minimum cathode current required for proper regulation?

The device requires a minimum cathode current of 600 µA to maintain regulation within specified parameters.

Is this component qualified for automotive applications?

No, the TL431BCDBZR is rated for commercial temperatures (0°C to 70°C) and lacks AEC-Q100 qualification. Automotive versions use the Q1 suffix.