TL431CDBZT

Overview

The TL431CDBZT is a precision programmable shunt regulator manufactured by Texas Instruments. It operates within an output voltage range of 2.495 V to 36 V and supports a maximum cathode current of 100 mA. The device features an initial accuracy of ±2% and a maximum temperature coefficient of 92 ppm/°C. It functions with a minimum input voltage of 2.47 V and a maximum input voltage of 37 V. The component is housed in a surface-mount SOT-23 package with three pins and operates within a temperature range of 0°C to 70°C.

Feature Summary

• Provides adjustable precision voltage reference functionality via external resistor divider networks.
• Operates as a shunt regulator with high dynamic impedance characteristics for stable regulation.
• Features internal bandgap reference circuitry ensuring consistent performance across operating conditions.

Applications

• Precision voltage references in power supply circuits
• Programmable output regulators for DC-DC converters
• Comparator applications requiring accurate threshold levels

Procurement Notes

Verify the specific suffix 'C' indicates the ±2% initial accuracy grade, distinct from 'A' or 'B' grades. Confirm the 'DBZT' suffix corresponds to the SOT-23 tape and reel packaging format. Ensure the component meets RoHS compliance requirements for the target assembly process. Cross-reference the datasheet revision date to confirm parameter consistency with design specifications.

Selection Notes

Select this component when a low-cost, adjustable shunt regulator is required for general-purpose voltage referencing. The ±2% accuracy suits applications where tighter tolerances are not critical. The SOT-23 package facilitates compact surface-mount designs. Consider thermal management if operating near the upper limits of the specified current or temperature ranges.

Part Context

The TL431 series represents a widely adopted family of programmable shunt regulators. The TL431CDBZT variant specifically denotes the commercial temperature grade with standard accuracy. This part serves as a foundational component in analog signal conditioning and power management architectures, offering a reliable alternative to fixed voltage references in cost-sensitive designs.

Replacement Considerations

Direct replacements include other TL431 variants with matching accuracy and package, such as TL431ACDBZT or TL431BCDBZT, provided the accuracy tolerance aligns with design requirements. Verify pinout compatibility and electrical parameters before substitution.