1N5520BUR-1

Overview

The Microchip Technology 1N5520BUR-1 is a low voltage avalanche Zener diode with a nominal breakdown voltage of 3.9 V at a test current of 20 mA. It operates within the 1N5518BUR-1 through 1N5546BUR-1 series, offering a power dissipation rating of 0.5 W and a junction temperature range from -65 °C to +175 °C. The device features a maximum dynamic impedance of 22 Ω and a maximum reverse leakage current of 1.0 µA. It utilizes a DO-213AA MELF glass surface mount package and includes an internal metallurgical bond for enhanced reliability.

Feature Summary

• Hermetically sealed glass MELF package with internal metallurgical bond construction
• Qualified per MIL-PRF-19500/437 standards for JAN, JANTX, and JANTXV military levels
• Inherently radiation hard design suitable for harsh environments
• Minimal capacitance characteristics with ESD protection per MIL-STD-750 Method 1020

Applications

• Voltage regulation over broad operating current and temperature ranges
• High density circuit designs requiring minimal parasitic effects
• High reliability applications specified by source control drawings
• Radiation-hardened electronic systems

Procurement Notes

Verify that the specific part number matches the required military qualification level (JAN, JANTX, or JANTXV) as indicated in the ordering nomenclature. Confirm the presence of the UR-1 suffix to ensure the inclusion of the internal metallurgical bond feature. Check RoHS compliance status if commercial grade versions are required, noting that compliant options may differ from qualified military grades.

Selection Notes

Select this component when a hermetically sealed surface mount Zener regulator is required for high-reliability applications. Ensure the 3.9 V nominal voltage aligns with the circuit design requirements. Consider the 0.5 W power dissipation limit and derating curves for thermal management. Verify compatibility with the mounting surface system due to the axial coefficient of expansion matching requirements.

Part Context

This device belongs to the 1N5518BUR-1 through 1N5546BUR-1 series of low voltage avalanche Zener diodes manufactured by Microsemi, now part of Microchip Technology. The series provides a wide selection of voltages from 3.3 V to 33 V in a compact DO-213AA MELF package. These components are designed to meet stringent military specifications while offering surface mount convenience.

Replacement Considerations

Consult official cross-reference tools for verified substitutes. Equivalent parts must match the 3.9 V Zener voltage, 0.5 W power rating, DO-213AA package, and metallurgical bond requirement.