1N5518B/TR

Overview

The Microchip Technology 1N5518B/TR is a low voltage avalanche Zener diode rated at 0.5 W with a nominal breakdown voltage of 3.3 V. It operates within a temperature range of -65°C to +175°C and features a DO-35 (DO-204AH) axial-lead glass package. The device exhibits a maximum reverse leakage current of 5 µA, a dynamic impedance of 26 Ohms, and a forward voltage of 1.1 V at 200 mA. It is supplied in tape and reel packaging.

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 specialized processing

Applications

• Voltage reference circuits
• Overvoltage protection networks
• Precision voltage regulation systems

Procurement Notes

Verify the specific suffix configuration against the datasheet nomenclature to ensure correct tolerance and bond type. Confirm RoHS compliance status as it varies by commercial grade availability. Check lead plating specifications if MIL-STD-750 solderability is required for your assembly process.

Selection Notes

Select this component when a precise 3.3 V reference is needed in an axial-lead form factor. Ensure the 0.5 W power dissipation rating accommodates the thermal environment. Consider the metallurgical bond option if military qualification levels are necessary for the application.

Part Context

This part belongs to the 1N5518 through 1N5546 series of low voltage avalanche Zener diodes. The series covers voltages from 3.3 V to 33 V with various tolerance options. The B suffix indicates a standard 5% voltage tolerance.

Replacement Considerations

Consult the manufacturer's cross-reference tools for equivalent parts. Verify that any substitute matches the 3.3 V nominal voltage, 0.5 W power rating, and DO-35 package dimensions.