1N3333B

Overview

The Microchip Technology 1N3333B is a high-power 50 W Zener diode belonging to the JEDEC registered 1N3305 through 1N3350B series. It provides voltage regulation with a nominal Zener voltage of 52 V at a test current of 240 mA. The device features a maximum dynamic impedance of 5.5 Ohms and a maximum reverse current of 10 µA. It operates within a junction temperature range of -65°C to +175°C and utilizes a DO-5 (DO-203AB) package with a hexagonal stud.

Feature Summary

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

Applications

• High power voltage regulation circuits
• Harsh environment electronic systems requiring radiation hardness
• Industrial equipment utilizing adequate heat sinking

Procurement Notes

Verify the specific manufacturer origin, as the datasheet references Microsemi Scottsdale Division while the brand is listed as Microchip Technology. Confirm that the component meets all required military qualification standards if applicable. Ensure proper mounting hardware and thermal management solutions are selected to support the 50 W power dissipation rating and maintain junction temperatures within specified limits during operation.

Selection Notes

Select this component when a robust, hermetically sealed Zener diode capable of handling 50 W is required. The standard polarity connects the anode to the case; use the 'R' suffix variant if cathode-to-case polarity is needed. Consider the thermal resistance and derating requirements carefully to ensure reliable performance under continuous load conditions in demanding applications.

Part Context

This part belongs to the 1N3305 through 1N3350B series of 50 Watt Zener diodes. These components are designed for broad voltage regulation needs ranging from 3.9 V to 200 V. They are available in various military qualifications including JAN, JANTX, and JANTXV per MIL-PRF-19500/358, offering different levels of screening for specialized applications.

Replacement Considerations

Consult the factory for surface mount equivalents or comparable parts from other manufacturers. Verify compatibility with existing mounting hardware and thermal interfaces when substituting.