1N3308RA

Overview

The Microchip Technology 1N3308RA 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 9.1 V at a test current of 1,370 mA. The device features a maximum dynamic impedance of 0.50 ohms and a maximum DC Zener current of 4,800 mA. It operates within a junction and storage temperature range of -65°C to +175°C. The component utilizes an industry-standard 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
• Inherently radiation hard per Microsemi MicroNote 050
• Non-sensitive to electrostatic discharge per MIL-STD-750 Method 1020

Applications

• Voltage regulation in power supplies requiring broad operating current ranges
• High-power protection circuits utilizing adequate mounting and heat sinking
• Military and aerospace applications benefiting from radiation hardness

Procurement Notes

Verify the specific suffix requirements against official datasheets before ordering. Confirm that the 'A' suffix denotes a +/- 10% tolerance on the Zener voltage. Ensure thermal management solutions are compatible with the DO-5 stud mount. Check for availability of optional mounting hardware such as insulators or bushings if required by the application design.

Selection Notes

Select this component when high power dissipation up to 50 watts is necessary. Consider the standard polarity where the anode connects to the case, or specify the 'R' suffix for reverse polarity. Evaluate thermal resistance characteristics, which are 2.0°C/W maximum from junction to base. Ensure the operating environment supports the specified temperature range and power derating curves above 75°C.

Part Context

This part belongs to the Microsemi Scottsdale Division 1N3305 through 1N3350B series of 50 Watt Zener diodes. These devices offer a broad selection of voltages ranging from 3.9 V to 200 V. The series is also available in JAN, JANTX, and JANTXV military qualifications per MIL-PRF-19500/358. They are designed for applications requiring low thermal resistance and high reliability.

Replacement Considerations

Equivalent parts include other 50 W Zener diodes with a 9.1 V nominal voltage and DO-5 package. Verify electrical parameters such as dynamic impedance and test current match the original specifications. Ensure the replacement device meets the same radiation hardness and hermetic sealing requirements if used in qualified environments.