1N5520D

Overview

The Microchip Technology 1N5520D is a single silicon Zener diode designed for voltage regulation and protection applications. It features a nominal Zener voltage of 3.9 V with a tight tolerance of ±1%. The device is rated for a power dissipation of 500 mW and utilizes a DO-204AH (DO-35) axial through-hole package. Key electrical characteristics include a maximum reverse leakage current of 1 µA and a Zener impedance of 30 ohms, ensuring stable performance in low-voltage circuit environments.

Feature Summary

• Provides precise voltage regulation with a tight ±1% tolerance on the 3.9 V nominal breakdown voltage.
• Constructed from silicon material within a hermetically sealed glass axial leaded package for durability.
• Engineered for low-power applications with a 500 mW power dissipation rating.

Applications

• Low voltage reference circuits requiring high precision.
• Overvoltage protection in sensitive electronic systems.
• Voltage clamping in signal processing paths.

Procurement Notes

Verify the specific suffix designation when ordering, as variants such as 1N5520D/TR may differ in packaging or compliance status compared to the standard 1N5520D. Confirm RoHS compliance requirements against the manufacturer's current documentation, as some legacy versions may not meet modern environmental standards. Ensure the procurement channel sources directly from authorized distributors to guarantee component authenticity and traceability.

Selection Notes

Select this component when a fixed 3.9 V reference is required with minimal deviation. The ±1% tolerance makes it suitable for precision analog circuits where standard 5% or 10% Zener diodes introduce unacceptable error. Consider the DO-204AH package constraints for PCB layout and thermal management relative to the 500 mW power rating.

Part Context

This part belongs to the 1N55xx series of low-voltage avalanche Zener diodes manufactured by Microchip Technology. The series offers various voltage options within the same mechanical footprint, allowing designers to maintain consistent board layouts while adjusting reference voltages. The 1N5520D specifically addresses the need for sub-4V regulation with high accuracy.

Replacement Considerations

The 1N5520D/TR is a variant of the same base part number, potentially differing in tape-and-reel packaging or specific regulatory compliance markings. Verify that any substitute maintains the identical 3.9 V Zener voltage, ±1% tolerance, and 500 mW power rating to ensure functional equivalence in the design.

FAQ

What is the maximum reverse leakage current for the 1N5520D?

The maximum reverse leakage current is specified as 1 µA.

Does the 1N5520D use a surface mount or through-hole package?

It uses a DO-204AH (DO-35) axial through-hole package.