1N3320RB

Overview

The Microchip Technology 1N3320RB 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 22 V at a test current of 570 mA. The device features a maximum dynamic impedance of 2.5 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, utilizing a DO-5 (DO-203AB) package with a hexagonal stud.

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 characteristics suitable for harsh environments

Applications

• High power voltage regulation circuits
• Harsh environment electronic systems requiring radiation hardness
• Military and aerospace applications demanding hermetic sealing

Procurement Notes

Verify that the specific part number includes the 'R' suffix to confirm the reversed polarity configuration where the cathode is connected to the case. Ensure the procurement documentation references the correct tolerance level associated with the 'B' suffix. Confirm compliance with the specified MIL-PRF-19500/358 qualification if military screening is required for the application.

Selection Notes

Select this component when a 50 W power dissipation capability is necessary for voltage regulation tasks. The choice is driven by the requirement for a 22 V reference point with tight +/- 5% tolerance. Consider the thermal management needs given the 0.5 W/oC derating factor above 75°C case temperature. The DO-5 package requires appropriate mounting hardware for effective heat sinking.

Part Context

This component belongs to the Microsemi Scottsdale Division's 1N3305 through 1N3350B series of high power Zener diodes. These devices are designed to operate up to 50 W with adequate heat sinking. The series covers a broad voltage range from 3.9 V to 200 V, offering various tolerance options and military qualifications for specialized industrial and defense applications.

Replacement Considerations

Consult the manufacturer for surface mount equivalents or alternative parts within the 1N3305-1N3350B series. Verify compatibility with existing mounting hardware and thermal interface requirements when substituting.