1N5520B

Overview

The Microchip Technology 1N5520B is a low voltage avalanche Zener diode rated at 3.9 V nominal voltage with a ±5% tolerance. It operates in the DO-35 (DO-204AH) axial-lead glass package and dissipates up to 0.5 W steady-state power. The device features a maximum reverse leakage current of 1.0 µA at 0.9 V, a dynamic impedance of 22 Ohms at a test current of 20 mA, and a forward voltage of 1.1 V at 200 mA. It supports an operating temperature range from -65°C to +175°C.

Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range.
• Features hermetically sealed axial-lead glass construction for environmental protection.
• Offers minimal capacitance suitable for high-frequency applications.
• Inherently radiation hard without requiring special processing.

Applications

• Voltage reference circuits
• Overvoltage protection systems
• Precision voltage regulators

Procurement Notes

Verify that the specific part number matches the required JEDEC type designation and tolerance suffix. Confirm RoHS compliance status if applicable, as commercial versions may differ from military qualified levels. Ensure the ordering suffix aligns with the desired metallurgical bond option or tape and reel packaging configuration.

Selection Notes

Select this component when a precise 3.9 V regulation point is required within the 0.5 W power dissipation limit. Consider the DO-35 package dimensions for through-hole mounting constraints. Evaluate the thermal resistance characteristics against the expected ambient temperature conditions to ensure safe operation within the specified junction temperature limits.

Part Context

This device belongs to the 1N5518B through 1N5546B series of low voltage avalanche Zener diodes manufactured by Microchip Technology. The series covers a voltage selection from 3.3 V to 33 V. These components are designed for general-purpose voltage regulation and are available in various tolerance grades and qualification levels.

Replacement Considerations

Direct substitutes include other 1N5520 variants with matching electrical parameters. Verify compatibility regarding package style and lead configuration before integration into existing designs.

FAQ

What is the maximum reverse leakage current for the 1N5520B?

The maximum reverse leakage current is 1.0 µA measured at 0.9 V.

Does the 1N5520B require a metallurgical bond for standard operation?

No, the standard version does not require a metallurgical bond; it is only necessary for specific military qualifications like JAN, JANTX, or JANTXV.