1N5521C

Overview

The Microchip Technology 1N5521C is a single Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 4.3 V with a tight tolerance of ±2%. The device is rated for a maximum power dissipation of 500 mW and operates within an extended junction temperature range of -65°C to +175°C. Packaged in the DO-204AH (DO-35) axial through-hole format, it exhibits a Zener impedance of 18 Ohms at the test current and maintains low reverse leakage current of 3 µA at 1.5 V.

Feature Summary

• Provides precise voltage regulation with a narrow ±2% tolerance band around the 4.3 V nominal point.
• Capable of reliable operation across extreme industrial temperature environments up to 175°C junction temperature.
• Utilizes a standard DO-204AH axial leaded package suitable for traditional through-hole mounting processes.

Applications

• Precision voltage reference circuits requiring stable DC levels
• Overvoltage protection stages in sensitive electronic systems
• General-purpose voltage regulation in industrial control equipment

Procurement Notes

Verify the specific suffix designation when ordering, as variants such as 1N5521C/TR indicate tape-and-reel packaging while others may be bulk. Confirm that the required tolerance and thermal specifications align with the design constraints before finalizing procurement. Cross-reference official datasheets to ensure compatibility with existing assembly processes and environmental requirements.

Selection Notes

Select this component when a highly accurate 4.3 V reference is necessary within a compact axial package. The ±2% tolerance makes it superior to standard 5% or 10% variants for precision analog applications. Ensure the circuit design accounts for the 500 mW power limit and the specific thermal characteristics defined by the DO-204AH housing.

Part Context

This part belongs to the established 1N5521 series of Zener diodes manufactured by Microchip Technology. The series offers various voltage options and tolerance grades to support diverse regulatory needs. The 1N5521C specifically denotes the 4.3 V variant with enhanced accuracy compared to broader tolerance counterparts in the same family.

Replacement Considerations

Official parameter-equivalent substitutes include the 1N5521C, 1N5521D, and 1N5521D/TR from Microchip Technology. These alternatives share identical electrical characteristics and physical form factors, allowing for direct interchangeability in existing designs without modification.