ZTL431BQE5TA

Overview

The ZTL431BQE5TA is an automotive-compliant adjustable precision shunt regulator manufactured by Diodes Incorporated. It features a B-grade initial tolerance of 0.5% and operates within an ambient temperature range of -40°C to +125°C. The device provides an adjustable output voltage from the reference level up to 20V, utilizing two external divider resistors. It supports a sink current capability ranging from 1mA to 100mA and includes a typical output impedance of 0.2Ω. Packaged in SOT25 (E5), it is fully lead-free, RoHS compliant, and halogen/antimony free.

Feature Summary

• AEC-Q100 qualified for Grade 1 temperature rating with PPAP capability
• Adjustable output voltage settable between 2.5V and 20V via external resistors
• High temperature stability with 0.5% initial tolerance at +25°C
• Low dynamic output impedance of 0.2Ω typical

Applications

• Opto-Coupler Linearization
• Linear Regulators
• Variable Reference
• Improved Zener Replacement

Procurement Notes

Verify that the specific ordering code matches the required package type and tolerance grade. Confirm the component meets AEC-Q100 Grade 1 requirements if used in automotive systems. Ensure the supply channel is authorized to guarantee compliance with IATF16949:2016 manufacturing standards. Check for any End-of-Life notices regarding alternative packages within the same series.

Selection Notes

Select this part when an adjustable shunt regulator with high accuracy is needed for automotive environments. The B-grade offers tighter tolerance than the A-grade variant. Consider the SOT25 package dimensions against available board space. Verify that the application circuit maintains cathode current within the 1mA to 100mA regulation window for optimal performance.

Part Context

This component belongs to the ZTL431xQ/ZTL432xQ family of three-terminal adjustable shunt regulators. It serves as an automotive-compliant alternative to standard commercial TL431 devices, offering extended temperature ranges and stricter quality controls. The ZTL431BQE5TA specifically denotes the B-grade tolerance version in the SOT25 package.

Replacement Considerations

Functionally equivalent to TL431/TL432 except for maximum operation voltage limits. Direct automotive-grade substitutes include other ZTL431AQ/BQ variants in different packages such as SOT23 or SOT23F.