TL431CZT

Overview

The TL431CZT is an adjustable shunt voltage reference manufactured by STMicroelectronics. It provides a programmable output voltage ranging from 2.495 V to 36 V using two external resistors. The device operates within a cathode current range of 1 mA to 100 mA and features a typical dynamic impedance of 0.22 Ω. It has a maximum supply voltage of 36 V and initial accuracy of ±2.21%. The component is housed in a TO-92-3 through-hole package and supports an operating temperature range of 0°C to +70°C.

Feature Summary

• Adjustable output voltage capability between 2.495 V and 36 V via external resistor divider
• Wide cathode current operating range from 1 mA to 100 mA
• Low dynamic output impedance for stable regulation
• Guaranteed thermal stability across the specified operating temperature range

Applications

• Precision voltage references in power supply circuits
• On-line isolated DC-to-DC converters
• Programmable Zener diodes
• Voltage regulators with remote sensing

Procurement Notes

Verify the specific suffix 'CZT' against the manufacturer's official datasheet to confirm the exact tolerance class, package type, and tape-and-reel specifications. Ensure the procurement channel sources genuine STMicroelectronics components to guarantee compliance with RoHS directives and AEC-Q100 qualification if required for automotive applications. Cross-reference ordering numbers with authorized distributors to avoid counterfeit parts.

Selection Notes

Select the TL431CZT when a low-cost, high-performance shunt regulator is needed for general-purpose applications. The C-grade tolerance suits designs where moderate precision is acceptable. Consider the TO-92-3 package for through-hole mounting requirements. Evaluate the 0°C to +70°C operating range against environmental conditions; extend to industrial or automotive grades if wider temperature ranges are necessary.

Part Context

The TL431 series represents a family of widely used adjustable shunt voltage references known for their versatility and reliability. The TL431CZT specifically denotes the standard commercial grade variant in a TO-92 package. This component serves as a fundamental building block in feedback loops for switching power supplies and linear regulators, offering a cost-effective alternative to discrete Zener diodes with superior performance characteristics.

Replacement Considerations

Compatible substitutes include the TL1431CLPR and TL431ACLPR from Texas Instruments. Verify pinout compatibility and electrical parameter alignment before substitution.