1N3311RA

Overview

The Microchip Technology 1N3311RA is a high-power 50 W Zener diode belonging to the 1N3305 through 1N3350B series. It provides voltage regulation with a nominal Zener voltage of 12.0 V at a test current of 1,000 mA. The device features a maximum dynamic impedance of 1.00 Ohms and supports a maximum DC Zener current of 3,800 mA. It operates within a junction and storage temperature range of -65°C to +175°C. The component utilizes an internal solder bond construction and is hermetically sealed in a DO-5 (DO-203AB) package.

Feature Summary

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

Applications

• High power voltage regulation circuits
• Military and aerospace electronic systems
• Industrial equipment requiring robust protection

Procurement Notes

Verify the specific suffix requirements when ordering. The 'R' suffix indicates reversed polarity where the cathode connects to the case, while the 'A' or 'B' suffixes denote tolerance levels of plus or minus ten percent and plus or minus five percent respectively. Confirm that the application requires the standard anode-to-case polarity if no 'R' suffix is present. Ensure mounting hardware accommodates the hexagonal stud dimensions specified in the datasheet.

Selection Notes

Select this component for applications demanding high power dissipation capabilities up to fifty watts with adequate heat sinking. Consider the thermal resistance specifications and derating curves for temperatures exceeding seventy-five degrees Celsius. Evaluate the required voltage tolerance against the available suffix options. Verify compatibility with the DO-5 package style and ensure the operating environment aligns with the specified temperature ranges.

Part Context

This device is part of the broader 1N3305 through 1N3350B and 1N4549B through 1N4556B series of high power Zener diodes manufactured by Microsemi. These components are designed to provide reliable voltage regulation across a broad range of voltages from three point nine volts to two hundred volts. The series is widely utilized in demanding applications due to its rugged construction and ability to handle significant power loads efficiently.

Replacement Considerations

Consult the manufacturer for surface mount equivalents or alternative part numbers within the same series that match the required voltage and tolerance specifications.