1N3349B

Single Zener Diodes Overview

The Microchip Technology 1N3349B 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 180 V at a test current of 68 mA. The device features a maximum dynamic impedance of 90 ohms and a maximum reverse current of 10 µA. Standard polarity connects the anode to the case, while reverse polarity is available via an 'R' suffix. It operates within a junction temperature range of -65°C to +175°C.

Single Zener Diodes Feature Summary

• Hermetically sealed welded construction with internal solder bond for reliability
• Inherently radiation hard design suitable for harsh environments
• Low thermal resistance junction-to-hexagonal base for efficient heat dissipation
• 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 supplies utilizing stud-mounted configurations

Single Zener Diodes Procurement Notes

Verify the specific ordering suffix to confirm polarity and tolerance requirements. The standard part number denotes anode-to-case polarity and +/- 5% voltage tolerance. Confirm that the application environment supports the specified junction temperature range and thermal management needs. Ensure compatibility with the DO-5 package dimensions for mounting hardware selection.

Single Zener Diodes Selection Notes

Select this component when high power dissipation up to 50 watts is required alongside strict voltage regulation stability. Consider the hermetic seal and radiation hardness for space or military applications. Evaluate the thermal resistance characteristics against the system's heat sinking capabilities. Verify the need for reverse polarity configuration if cathode-to-case connection is necessary.

Single Zener Diodes Part Context

This device belongs to the Microsemi Scottsdale Division 1N3305 through 1N3350B series of 50 Watt Zener diodes. These components are designed for broad voltage ranges from 3.9 V to 200 V. The series includes military qualifications such as JAN, JANTX, and JANTXV upon request. They utilize the industry-standard DO-5 (DO-203AB) metal and glass package.

Single Zener Diodes Replacement Considerations

Consult the manufacturer for surface mount equivalents or direct replacements within the 1N33xxB series. Verify electrical parameters and mechanical dimensions before substituting. Military qualified versions may require specific prefix additions.