TL431CDBZR-QR

Overview

The TL431CDBZR-QR is a programmable shunt voltage reference manufactured by Nexperia. It operates within an output voltage range of 2.4 V to 36 V, set via two external resistors. The device features a standard grade reference voltage tolerance of 2%. It is qualified under the AEC-Q101 automotive standard and housed in a SOT-23 (TO-236AB) surface-mount package.

Feature Summary

• Programmable cathode voltage adjustable between 2.4 V and 36 V using external resistors
• Standard grade reference voltage tolerance of 2%
• Qualified for automotive applications under the AEC-Q101 standard

Applications

• Shunt regulator circuits
• Precision current limiter designs
• Isolated feedback loops for Switch Mode Power Supplies (SMPS)

Procurement Notes

Verify the specific suffix -QR against the official Nexperia datasheet to confirm it denotes the correct reel packaging configuration. Ensure the component meets the required AEC-Q101 qualification level for your target application environment before finalizing procurement specifications.

Selection Notes

Select this component when a 2% reference tolerance is sufficient for the circuit requirements. Confirm that the SOT-23 package dimensions fit the available PCB space. Verify that the operating temperature range aligns with the system's thermal constraints.

Part Context

This part belongs to the TL431 family of three-terminal shunt regulators. It shares the same functional architecture as other variants but is distinguished by its specific tolerance grade and automotive qualification status. The device serves as a stable voltage reference or error amplifier in power management systems.

Replacement Considerations

Compatible substitutes include TL431ACDBZR-QR for tighter 1% tolerance or TL431BCDBZR-QR for 0.5% tolerance. Non-automotive equivalents like TL431CDBZR,215 may be used if AEC-Q101 qualification is not mandatory.