TL431IZ

Overview

The TL431IZ is an adjustable shunt voltage reference manufactured by STMicroelectronics, housed in a TO-92-3 through-hole package. It provides an output voltage range of 2.5 V to 36 V, set via two external resistors. The device features an initial accuracy of 2% and a temperature coefficient of 100 ppm/°C. It operates with a cathode current range from 1 mA to 100 mA and supports a maximum series input voltage of 36 V. The component functions within a temperature range of -40 °C to +105 °C.

Feature Summary

• Adjustable output voltage programmable between 2.5 V and 36 V using external resistors
• Guaranteed temperature stability across the full operating range
• Wide sink current capability supporting operation from 1 mA to 100 mA

Applications

• Precision voltage regulation in power supply circuits
• Programmable Zener diode replacement in analog control loops
• Reference voltage source for switching mode power supplies

Procurement Notes

Verify the specific suffix 'IZ' against the manufacturer's official datasheet to confirm the exact tolerance grade and packaging details. Ensure the procurement channel sources directly from authorized distributors or the manufacturer to guarantee authenticity. Cross-reference the RoHS compliance status and lead-free specifications with the latest product documentation before finalizing orders.

Selection Notes

Select this component when a standard 2.5 V reference is insufficient and a higher programmable voltage up to 36 V is required. The TO-92 package suits through-hole designs where space constraints are less critical than cost. Choose this part over fixed references for applications needing precise voltage setting without complex divider networks, leveraging its wide operating current range for stable regulation.

Part Context

The TL431 series serves as a widely adopted programmable shunt regulator in electronic design. The TL431IZ variant specifically denotes the STMicroelectronics version in a TO-92 plastic package. It belongs to a family of devices known for replacing traditional Zener diodes, offering superior dynamic impedance and temperature stability for feedback loop compensation in linear and switching regulators.

Replacement Considerations

Compatible substitutes include the TL431AIZ and TL431BIZ for tighter tolerance requirements, or generic equivalents like KA431 and REF431 if pin compatibility and electrical characteristics align with the original specification.