1N3328A

Overview

The Microchip Technology 1N3328A is a high-power 50 W Zener diode from the JEDEC registered 1N3305 through 1N3350B series. It provides voltage regulation with a nominal Zener voltage of 43 V and a tolerance of ±10%. The device features an internal solder bond construction within a hermetically sealed DO-5 (DO-203AB) metal and glass case. It supports a maximum DC power dissipation of 50 watts at a case temperature below 75°C, with thermal resistance of 2.0°C/W maximum junction to hexagonal base.

Feature Summary

• Hermetically sealed welded construction for environmental protection
• Internal solder bond design for mechanical stability
• Standard polarity configuration with anode connected to the case
• Inherently radiation hard characteristics

Applications

• High power voltage regulation in industrial environments
• Protection circuits requiring robust thermal performance
• Military and aerospace applications utilizing MIL-PRF-19500/358 qualifications

Procurement Notes

Verify the specific suffix requirements for your application. The 'A' suffix denotes a ±10% Zener voltage tolerance, whereas 'B' indicates ±5%. Confirm if reverse polarity is needed by checking for an 'R' suffix. Ensure mounting hardware matches the 11/16 inch hexagonal stud with 1/4-28 threads specified in the datasheet.

Selection Notes

Select this component when a 43 V regulation point is required with high power handling capabilities. The 1N3328A is suitable for applications demanding hermetic sealing and radiation hardness. Consider the thermal derating curve if operating above 75°C case temperature. Verify that the ±10% tolerance meets the circuit precision requirements compared to tighter tolerance alternatives.

Part Context

This part belongs to the Microsemi Scottsdale Division 1N3305 through 1N3350B series of 50 Watt Zener diodes. These devices are designed for broad voltage ranges from 3.9 V to 200 V. The series includes military qualifications available via JAN, JANTX, and JANTXV prefixes, offering various screening levels for critical applications.

Replacement Considerations

Equivalent parts include the 1N3328B for tighter ±5% tolerance or the 1N3328RB for reversed polarity configurations. Direct substitutes must match the 50 W power rating and DO-5 package dimensions.