1N5520A

Overview

The Microchip Technology 1N5520A/TR is a single silicon Zener diode housed in the DO-204AH (DO-35) axial through-hole package. It features a nominal Zener voltage of 3.9 V with a tolerance of ±10%. The device supports a maximum DC power dissipation of 500 mW and operates within a junction temperature range of -65°C to +175°C. Electrical characteristics include a maximum reverse leakage current of 1 µA at 900 mV and a forward voltage of 1.1 V at 200 mA.

Feature Summary

• Provides stable voltage regulation using a single unidirectional silicon junction structure.
• Features low reverse leakage current for improved circuit efficiency.
• Constructed with double plug design and metallurgical bonding for reliability.
• Capable of operation across an extended industrial temperature range.

Applications

• Voltage reference circuits requiring precise potential levels
• Overvoltage protection stages in signal paths
• Clamping applications for transient suppression

Procurement Notes

Verify the specific suffix against official documentation, as packaging formats such as tape-and-reel or bulk may vary by manufacturer lot. Confirm RoHS compliance status and lead-free availability directly with the supplier, as historical variants may differ from current production runs. Ensure the ordering part number matches the required hermetic or commercial grade specifications defined in the datasheet.

Selection Notes

Select this component when a 3.9 V regulation point is required in a standard axial glass package. Consider the 500 mW power rating and thermal derating requirements above 50°C during design. Evaluate the ±10% voltage tolerance against circuit sensitivity. Verify that the DO-35 footprint aligns with the target PCB layout constraints.

Part Context

This device belongs to the 1N55xx series of glass-encapsulated Zener diodes manufactured by Microchip Technology. The series offers a wide range of voltage options within the same physical form factor. These components are widely used in general-purpose electronics where reliable axial mounting and proven silicon technology are prioritized over surface-mount integration.

Replacement Considerations

Cross-reference with other manufacturers offering JEDEC-registered 1N5520A equivalents. Verify pinout compatibility and ensure the replacement meets the 3.9 V nominal voltage and 500 mW power dissipation specifications. Check for identical DO-35 package dimensions to maintain mechanical fit.