1N3327B

Overview

The Microchip Technology 1N3327B is a high-power 50 W Zener diode within the JEDEC registered 1N3305 through 1N3350B series. It provides voltage regulation with a nominal Zener voltage of 39 V at a test current of 320 mA. The device features a maximum dynamic impedance of 4.0 Ohms and a maximum reverse current of 10 µA at 39 V. It operates within a junction temperature range of -65°C to +175°C, utilizing a DO-5 (DO-203AB) hexagonal stud package.

Feature Summary

• Hermetically sealed welded metal and glass construction for durability
• Internal solder bond design ensuring robust electrical connections
• Standard polarity configuration with anode connected to the case
• Inherently radiation hard characteristics suitable for harsh environments

Applications

• High power voltage regulation circuits
• Industrial control systems requiring wide operating temperatures
• Military and aerospace electronic assemblies
• Power supply protection and reference applications

Procurement Notes

Verify the specific revision level and manufacturer origin when sourcing this component, as historical production involved Microsemi Scottsdale Division. Confirm that the part number strictly matches the 1N3327B designation without additional military prefixes like JAN or JANTX unless explicitly required by the system specification. Ensure compatibility with the DO-5 mounting hardware and thermal interface requirements during integration.

Selection Notes

Select the 1N3327B when a 39 V regulation point is required in high-power applications up to 50 W. The B suffix indicates a standard 5% voltage tolerance. Consider the DO-5 stud mount form factor for efficient heat dissipation via a chassis or heatsink. Evaluate the positive temperature coefficient for stability in varying thermal conditions compared to lower voltage alternatives.

Part Context

This component belongs to the 1N3305 through 1N3350B series of 50 Watt Zener diodes. These devices are designed for rugged environments and offer broad voltage coverage from 3.9 V to 200 V. The series supports various screening levels including JAN, JANTX, and JANTXV qualifications per MIL-PRF-19500/358 for specialized military and aerospace deployments.

Replacement Considerations

The 1N4553B serves as a direct functional equivalent within the same series offering identical 50 W power ratings and 39 V specifications.