1N5520C

Overview

The Microchip Technology 1N5520C is a single silicon Zener diode designed for voltage regulation and circuit protection. It features a nominal reference voltage of 3.9 V with a tolerance of 10%. The device operates in the unidirectional configuration and is rated for a maximum power dissipation of 0.5 W at a test current of 20 mA. It exhibits a maximum dynamic impedance of 22 Ω and a maximum reverse leakage current of 1 µA. The component utilizes a DO-204AH (DO-35) through-hole package, ensuring compatibility with standard axial lead mounting techniques.

Feature Summary

• Provides stable voltage regulation via Zener breakdown characteristics
• Utilizes hermetically sealed glass encapsulation for environmental resistance
• Designed for low-noise performance in sensitive signal paths

Applications

• Voltage stabilization in precision analog circuits
• Overvoltage protection for sensitive semiconductor inputs
• Reference voltage generation in measurement instrumentation

Procurement Notes

Verify that the specific order corresponds to the Microchip Technology manufacturing source rather than generic equivalents. Confirm the package type matches the required DO-204AH axial lead form factor. Ensure the voltage rating aligns with the 3.9 V specification for the intended circuit design. Check for any specific military or industrial grade markings if operating conditions require extended temperature ranges beyond standard commercial limits.

Selection Notes

Select this component when a precise 3.9 V reference is required in a through-hole assembly. The 0.5 W power rating supports moderate current loads without excessive thermal management. The low dynamic impedance ensures minimal voltage fluctuation under varying load conditions. Consider the physical size constraints of the DO-35 package during PCB layout planning.

Part Context

This part belongs to the standard 1N55xx series of Zener diodes, widely used for general-purpose voltage regulation. The 1N5520C specifically targets applications requiring a 3.9 V breakdown voltage. It serves as a fundamental discrete semiconductor component for stabilizing DC supply rails and protecting downstream components from transient overvoltages.

Replacement Considerations

Cross-reference with other manufacturers offering 1N5520C equivalents. Verify pinout compatibility and electrical tolerances match the original specifications. Ensure the replacement maintains the same DO-204AH package dimensions for mechanical fit.