1N5520B/TR

Overview

The Microchip Technology 1N5520B/TR 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 package and dissipates up to 500 mW of steady-state power. The device features a maximum reverse leakage current of 1 µA at 900 mV and a maximum Zener impedance of 22 Ohms at the test current of 20 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 glass axial-lead construction for environmental protection.
• Offers minimal capacitance suitable for high-frequency applications.
• Demonstrates inherent radiation hardness characteristics.

Applications

• Voltage regulation circuits requiring precise breakdown voltages.
• Reference voltage sources in precision measurement equipment.
• Overvoltage protection stages in sensitive electronic systems.

Procurement Notes

Verify that the specific part number matches the required JEDEC type designation and tolerance suffix. Confirm RoHS compliance status if restricted materials are prohibited, as commercial versions may differ from qualified levels. Ensure the tape and reel packaging aligns with automated assembly requirements before finalizing procurement orders.

Selection Notes

Select this component when a 3.9 V reference with tight ±5% tolerance is required. Consider the 500 mW power dissipation limit and thermal resistance values during circuit layout. Verify that the forward voltage drop and reverse leakage specifications meet the system's isolation and efficiency constraints under expected operating temperatures.

Part Context

This device belongs to the 1N5518 through 1N5546 series of 0.5 W axial-leaded glass Zener Voltage Regulators. The series provides a wide selection of voltages from 3.3 to 33 volts. The B suffix specifically denotes a standard 5% voltage tolerance, distinguishing it from wider or tighter tolerance variants within the same family.

Replacement Considerations

Direct replacements include other 1N5520 variants such as 1N5520A or 1N5520C, provided the voltage tolerance requirements match the application needs. Cross-reference with MIL-PRF-19500/437 qualified parts like JAN1N5520B-1 if military-grade reliability is necessary.