1N3320A

Overview

The Microchip Technology 1N3320A is a high-power 50 W Zener diode belonging to 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 2.50 ohms and a maximum DC Zener current of 1,900 mA. It operates within a junction and storage temperature range of -65°C to +175°C, utilizing a DO-5 (DO-203AB) hexagonal stud package.

Feature Summary

• Hermetically sealed welded metal and glass construction
• Internal solder bond design for structural integrity
• Standard polarity configuration with anode connected to case
• Inherently radiation hard characteristics

Applications

• High power voltage regulation circuits
• Overvoltage protection systems
• Reference voltage generation in harsh environments

Procurement Notes

Verify the specific tolerance suffix when ordering, as the 'A' designation indicates a +/- 10% Zener voltage tolerance compared to the standard B suffix. Confirm that the required reverse polarity option is selected if the cathode-to-case configuration is necessary for the circuit layout. Ensure adequate heat sinking is planned to maintain the case temperature below 75°C for full 50 W dissipation capability.

Selection Notes

Select this component for applications requiring robust voltage clamping in high-power scenarios. The DO-5 package allows for direct mounting to chassis or heatsinks via the hexagonal stud. Consider the thermal resistance of 2.0°C/W maximum when designing the thermal management system to ensure reliable operation across the specified wide temperature range.

Part Context

This device is part of the Microsemi Scottsdale Division's extensive line of 50 Watt Zener diodes, which also includes the 1N4549B through 1N4556B series. These components are designed for demanding industrial and military applications where high power handling and reliability are critical. The series offers a broad selection of voltages ranging from 3.9 V to 200 V.

Replacement Considerations

Equivalent parts include other 50 W Zener diodes with a 22 V nominal rating in a DO-5 package. Verify mechanical dimensions and thermal characteristics match the original design requirements before substitution.