1N3345RB

Single Zener Diodes Overview

The Microchip Technology 1N3345RB is a high-power 50 W Zener diode belonging to the 1N3305 through 1N3350B series. It provides voltage regulation with a nominal Zener voltage of 120 V and a test current of 100 mA. The device features a maximum dynamic impedance of 40 ohms at the test current and 240 ohms at a knee current of 5 mA. It operates within a junction and storage temperature range of -65°C to +175°C, with a maximum DC Zener current of 335 mA. The component utilizes a DO-5 (DO-203AB) package with an 11/16 inch hexagonal stud.

Single Zener Diodes Feature Summary

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

Single Zener Diodes Applications

• High power voltage regulation in industrial systems
• Overvoltage protection circuits requiring robust thermal performance
• Military and aerospace applications utilizing JAN or JANTX qualifications

Single Zener Diodes Procurement Notes

Verify the specific suffix requirements when ordering. The 'R' suffix confirms reverse polarity where the cathode connects to the case. The 'B' suffix indicates a standard tolerance of plus or minus 5 percent on the Zener voltage. Confirm that the application environment supports the specified operating temperatures and that adequate heat sinking is provided to maintain the case temperature below 75 degrees Celsius for full power dissipation.

Single Zener Diodes Selection Notes

Select this component for applications requiring high power handling capabilities up to 50 watts. Ensure the system design accommodates the DO-5 package dimensions and the 11/16 inch hexagonal stud mounting style. Consider the thermal resistance of 2.0 degrees Celsius per watt maximum when designing the heat sink interface. Verify that the required Zener voltage falls within the available range of the series and that the reverse polarity orientation matches the circuit layout constraints.

Single Zener Diodes Part Context

This part belongs to the 1N3305 through 1N3350B series of 50 Watt Zener diodes manufactured by Microsemi Scottsdale Division. The series covers a broad voltage range from 3.9 Volts to 200 Volts. These devices are JEDEC registered and offer military qualifications including JAN, JANTX, and JANTXV levels upon request. The series is designed for high reliability in demanding electronic environments.

Single Zener Diodes Replacement Considerations

Equivalent parts include other 50 Watt Zener diodes in the DO-5 package with a 120 Volt rating and compatible thermal characteristics. Verify mechanical fit for the hexagonal stud and ensure electrical parameters such as dynamic impedance and test current align with the original design specifications.