TS431BIZ

Overview

The TS431BIZ is a low-voltage, three-terminal adjustable shunt voltage reference manufactured by STMicroelectronics. It operates within a voltage range of 1.24 V to 6 V and features an initial accuracy of 0.5%. The device supports a cathode current range from 60 μA to 30 mA with a maximum input voltage of 10 V. It exhibits a temperature coefficient of 100 ppm/°C and an output impedance of 0.2 Ω. Qualified under AEC-Q100 standards for automotive applications, it functions reliably between -40°C and +125°C in a TO-92-3 package.

Feature Summary

• Provides precise programmable shunt regulation with 0.5% initial accuracy
• Operates at low voltages starting from 1.24 V with wide cathode current range
• Ensures stability across varying capacitive loads
• Includes integrated ESD protection mechanisms

Applications

• Regulating 3.3 V switching power supplies
• Driving optocouplers in feedback loops
• Replacing TL431 and TL1431 references in compact designs
• Automotive electronic control units requiring AEC-Q100 compliance

Procurement Notes

Verify the specific suffix 'IZ' corresponds to the TO-92-3 through-hole package configuration rather than surface-mount variants. Confirm that the 0.5% precision grade meets the design requirements for critical reference circuits. Ensure compatibility with existing PCB footprints designed for TO-92 packages during component sourcing and assembly planning.

Selection Notes

Select this component when high precision (0.5%) is required alongside automotive qualification. The TO-92 package suits prototyping or applications where through-hole mounting is preferred over SMD. Consider the 100 ppm/°C temperature coefficient for thermal stability needs. Evaluate the 60 μA minimum current requirement against load conditions to ensure proper regulation operation.

Part Context

Part of the TS431 family of adjustable shunt references, offering improved performance over legacy TL431 devices. The series includes variants with different accuracies (2%, 1%, 0.5%) and packages (SOT23-5, TO-92). The TS431BIZ specifically denotes the 0.5% accuracy version in the TO-92-3 housing, targeting cost-sensitive yet reliable industrial and automotive applications.

Replacement Considerations

Direct substitutes include other TS431 variants with matching accuracy and package, such as TS431AIYLT for surface mount equivalents. Cross-reference with TL431 components if pinout compatibility is prioritized over performance gains. Verify that alternative parts meet the same AEC-Q100 automotive qualification standards.