1N3338RB

Single Zener Diodes Overview

The Microchip Technology 1N3338RB is a high-power 50 W Zener diode from the 1N3305B through 1N3350B series. It provides voltage regulation with a nominal Zener voltage of 75 V at a test current of 170 mA. The device features a maximum dynamic impedance of 9.0 Ohms and a maximum reverse current of 10 µA. It operates within a junction temperature range of -65°C to +175°C and dissipates up to 50 watts at a case temperature below 75°C. The component utilizes a DO-5 (DO-203AB) package with an 11/16 inch hexagonal stud.

Single Zener Diodes Feature Summary

• Hermetically sealed welded metal and glass construction for durability
• Internal solder bond design ensuring mechanical stability
• Reverse polarity configuration with cathode connected to the case
• Inherently radiation hard performance characteristics

Single Zener Diodes Applications

• High power voltage regulation circuits
• Military aerospace systems requiring radiation hardness
• Industrial equipment needing robust thermal management

Single Zener Diodes Procurement Notes

Verify that the specific part number includes the 'R' suffix to confirm reversed polarity, as standard units feature anode-to-case connections. Ensure the procurement documentation references the correct tolerance suffix, where 'B' indicates a 5% Zener voltage tolerance. Confirm compliance with MIL-PRF-19500/358 if military screening levels are required for the application environment.

Single Zener Diodes Selection Notes

Select this component when high power dissipation capabilities are necessary for voltage reference applications. The DO-5 package requires appropriate mounting hardware and heat sinking to maintain case temperatures below 75°C for full 50 W operation. Consider the reverse polarity configuration if circuit layout necessitates the cathode connection to the heatsink or chassis ground.

Single Zener Diodes Part Context

This device belongs to the Microsemi Scottsdale Division 1N3305B through 1N3350B series of 50 Watt Zener diodes. The series covers a broad voltage range from 3.9 V to 200 V. These components are JEDEC registered and available in various military qualification levels including JAN, JANTX, and JANTXV upon request by adding specific prefixes to the base part number.

Single Zener Diodes Replacement Considerations

Equivalent parts include 1N4551B and other devices within the same 1N3305B-1N3350B family sharing identical electrical ratings and package dimensions.