1N3343RB

Single Zener Diodes Overview

The Microchip Technology 1N3343RB is a high-power 50 W Zener diode with a nominal voltage of 120 V and a ±5% tolerance. It operates within a junction temperature range of -65°C to +175°C and features a maximum dynamic impedance of 40.00 Ω at the test current of 100 mA. The device utilizes a DO-5 (DO-203AB) package with an 11/16 inch hexagonal stud, providing a thermal resistance of 2.0 °C/W from junction to base.

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 per Microsemi MicroNote 050

Single Zener Diodes Applications

• High power voltage regulation in aerospace systems
• Military electronic circuit protection
• Industrial equipment requiring wide temperature stability

Single Zener Diodes Procurement Notes

Verify that the specific part number includes the 'R' suffix to confirm reverse polarity orientation, as standard units feature an anode-to-case connection. Confirm the 'B' suffix indicates the required ±5% voltage tolerance. Ensure mounting hardware specifications align with the 11/16 inch hexagonal stud dimensions for proper installation.

Single Zener Diodes Selection Notes

Select this component when a 120 V breakdown voltage with tight tolerance is required in high-power environments. The reversed polarity design simplifies heat sinking integration by allowing the cathode to serve as the thermal path. Verify that the application can accommodate the DO-5 stud mount form factor and meets the necessary thermal dissipation requirements.

Single Zener Diodes Part Context

This device belongs to the 1N3305 through 1N3350B series of 50 W Zener diodes manufactured by Microchip Technology's Scottsdale Division. The series covers a broad voltage range from 3.9 V to 200 V, offering standardized JEDEC registration for compatibility in critical applications across industrial and defense sectors.

Single Zener Diodes Replacement Considerations

Equivalent parts include the 1N4549B through 1N4556B series variants. Military qualified versions are available with JAN, JANTX, or JANTXV prefixes according to MIL-PRF-19500/358 standards.