1N3348RB

Single Zener Diodes Overview

The Microchip Technology 1N3348RB is a high-power 50 W Zener diode from the JEDEC registered 1N3305 thru 1N3350B series. It features a nominal Zener voltage of 120 V with a ±5% tolerance, indicated by the 'B' suffix. The 'R' suffix denotes reverse polarity, connecting the cathode to the case. Electrical characteristics are defined at a 30°C case temperature, with a Zener test current (IZT) of 100 mA and a maximum DC Zener current (IZM) of 335 mA. The device operates within a junction and storage temperature range of -65°C to +175°C.

Single Zener Diodes Feature Summary

• Hermetically sealed welded construction with internal solder bond for reliability
• Reverse polarity configuration with cathode connected to the case
• Inherently radiation hard design suitable for harsh environments
• Non-sensitive to electrostatic discharge per MIL-STD-750 Method 1020

Single Zener Diodes Applications

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

Single Zener Diodes Procurement Notes

Verify the specific revision level and manufacturing date code against the latest Microsemi datasheet before procurement. Confirm that the reverse polarity orientation matches the system design requirements, as the standard configuration connects the anode to the case. Ensure mounting hardware specifications align with the DO-5 package dimensions and hexagonal stud threads for proper thermal interface.

Single Zener Diodes Selection Notes

Select this component when a 120 V regulation point is required with high power dissipation capabilities. The reverse polarity option simplifies mounting where the case must serve as the electrical connection. Consider the thermal resistance and derating curves to ensure adequate heat sinking maintains the junction temperature within safe operating limits under maximum load conditions.

Single Zener Diodes Part Context

This part belongs to the 1N3305 through 1N3350B series of 50 Watt Zener diodes manufactured by Microsemi's Scottsdale Division. These devices are designed for applications demanding high power handling and wide voltage ranges from 3.9 V to 200 V. The series includes various tolerance options and military qualifications, providing flexibility for diverse electronic design needs.

Single Zener Diodes Replacement Considerations

Direct substitutes include other parts within the 1N3305-1N3350B series with matching voltage and polarity. Verify mechanical compatibility with the DO-5 (DO-203AB) package and thread specifications. Cross-reference with JAN or JANTX qualified equivalents if environmental screening levels require higher reliability standards.