1N5521/TR

Overview

The 1N5521/TR is a Zener diode manufactured by Microchip Technology, designed for voltage regulation applications. It features a nominal Zener voltage of 4.3 V and a maximum power dissipation of 500 mW. The device operates within a temperature range of -65°C to +175°C junction temperature. Key electrical parameters include a test current of 20 mA, a maximum reverse leakage current of 3 µA at 1.5 V, and a Zener impedance of 18 Ohms. The forward voltage is 1.1 V at 200 mA. It is housed in a DO-204AH (DO-35) axial through-hole package and supplied in tape and reel packaging.

Feature Summary

• Provides stable voltage regulation with a nominal 4.3 V Zener breakdown.
• Capable of handling up to 500 mW of power dissipation.
• Engineered for high-temperature operation up to 175°C junction temperature.
• Utilizes a standard axial through-hole package for easy circuit integration.

Applications

• Voltage reference circuits requiring precise 4.3 V levels.
• Overvoltage protection for sensitive electronic components.
• Clamping applications in signal processing paths.
• General-purpose voltage regulation in industrial equipment.

Procurement Notes

Verify the specific suffix designation against official Microchip documentation to confirm packaging and tolerance variations. Ensure compatibility with existing board layouts regarding the DO-204AH footprint. Confirm that the 500 mW power rating aligns with thermal management requirements in the final assembly. Cross-reference datasheet revisions to ensure parameter consistency with design specifications.

Selection Notes

Select this component when a 4.3 V regulation point is required with moderate power handling capabilities. The wide operating temperature range makes it suitable for harsh environments. Consider the 18 Ohm impedance for dynamic load changes. Verify that the axial leaded format fits the mechanical constraints of the target enclosure compared to surface-mount alternatives.

Part Context

This part belongs to the Microchip Technology Zener Diode family, specifically within the DO-204AH package series. It shares common characteristics with other devices in the 1N55xx series, differing primarily in Zener voltage and tolerance specifications. The /TR suffix indicates tape and reel packaging for automated assembly processes.

Replacement Considerations

Publicly confirmed substitute part numbers include 1N5521C, 1N5521D, and 1N5521D/TR from Microchip Technology. These variants offer parameter equivalence but may differ in tolerance or packaging configuration. Verify electrical specifications before substitution.