1N3347RB

Single Zener Diodes Overview

The Microchip Technology 1N3347RB is a high-power 50 W Zener diode from the 1N3305B through 1N3350B series. It provides voltage regulation with a nominal Zener voltage of 160 V at a test current of 80 mA. The device features a maximum dynamic impedance of 80 ohms and a maximum reverse current of 10 µA at its rated voltage. It operates within a junction and storage temperature range of -65°C to +175°C, with a thermal resistance of 2.0°C/W maximum. The component utilizes a DO-5 (DO-203AB) package with an 11/16 inch hexagonal stud.

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 aerospace systems
• Defense electronics requiring radiation tolerance
• Industrial equipment operating under extreme temperatures
• Power supply protection circuits

Single Zener Diodes Procurement Notes

Verify the specific suffix requirements when ordering, as the 'R' indicates reversed polarity and 'B' denotes a 5% voltage tolerance. Confirm that the application supports the required mounting hardware for the hexagonal stud package. Ensure adequate heat sinking is provided to maintain case temperatures below 75°C for full 50 W dissipation. Check for military qualification prefixes if JAN or JANTX screening levels are necessary for the project.

Single Zener Diodes Selection Notes

Select this component when a high-voltage Zener reference near 160 V is required in a ruggedized environment. The 1N3347RB is appropriate for designs needing inherent radiation hardness and high thermal stability. Consider the DO-5 package constraints and the need for stud mounting hardware during the mechanical design phase. Evaluate the thermal management strategy to ensure the junction temperature remains within the specified limits during operation.

Single Zener Diodes Part Context

This part belongs to the Microsemi Scottsdale Division 1N3305B through 1N3350B series of 50 W Zener diodes. These devices are JEDEC registered and offer a broad voltage range from 3.9 V to 200 V. The series is designed for applications demanding high power handling and robust construction. The 1N3347RB specifically addresses the higher end of the voltage spectrum within this family.

Single Zener Diodes Replacement Considerations

Equivalent parts include the 1N4556B from the parallel 1N4549B through 1N4556B series. Military qualified versions such as JAN1N3347B, JANTX1N3347B, or JANTXV1N3347B provide enhanced screening levels while maintaining electrical compatibility.