1N3331RB

Single Zener Diodes Overview

The Microchip Technology 1N3331RB 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 50 V at a test current of 250 mA. The device features a maximum dynamic impedance of 5.00 Ohms and a 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.

Single Zener Diodes Feature Summary

• Hermetically sealed welded metal and glass construction for durability
• Internal solder bond design ensuring robust mechanical integrity
• 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 rugged components
• Military and aerospace applications demanding radiation hardness
• Power supplies operating under extreme thermal conditions

Single Zener Diodes Procurement Notes

Verify the specific revision level and manufacturing origin when sourcing this component, as historical production may involve different entities such as Microsemi or Microchip Technology. Confirm that the R suffix correctly denotes the reversed polarity configuration where the cathode is connected to the case. Ensure compatibility with mounting hardware requirements for the DO-5 package stud before finalizing procurement specifications.

Single Zener Diodes Selection Notes

Select this component when a 50 W power dissipation capability is required alongside strict voltage tolerance needs. The 1N3331RB offers a 5% tolerance on its nominal 50 V breakdown voltage. Consider the thermal resistance of 2.0°C/W maximum when designing heat sinking solutions. The hermetic seal and radiation hardness make it preferable over standard plastic packaged alternatives for long-life or space-constrained deployments.

Single Zener Diodes Part Context

This part belongs to the broad family of 50 Watt Zener diodes covering voltages from 3.9 V to 200 V. The 1N3331RB specifically addresses mid-range voltage regulation needs within this high-power category. It shares the same DO-5 package and internal solder bond construction as other members of the 1N3305 through 1N3350B series, allowing for standardized mechanical integration across various power supply designs.

Single Zener Diodes Replacement Considerations

Direct replacements include other parts within the 1N3305 through 1N3350B series that match the 50 V specification and reversed polarity requirement. Equivalent military qualified versions are available with JAN, JANTX, or JANTXV prefixes. Verify that any substitute maintains the same DO-5 package dimensions and thermal characteristics to ensure proper mounting and heat dissipation.

Single Zener Diodes FAQ

What does the 'R' suffix indicate in the 1N3331RB part number?

The 'R' suffix indicates a reversed polarity configuration where the cathode is connected to the case, differing from the standard anode-to-case connection.

Is the 1N3331RB radiation hard?

Yes, the device is inherently radiation hard as described in Microsemi MicroNote 050, making it suitable for radiation-intensive environments.

What is the maximum DC Zener current for the 1N3331RB?

The maximum DC Zener current (IZM) for the 1N3331RB is 830 mA.