1N3313RA

Overview

The Microchip Technology 1N3313RA 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 14.0 V at a test current of 890 mA. The device features a maximum dynamic impedance of 1.20 ohms and a typical temperature coefficient of +0.070 %/°C. It operates within a junction and storage temperature range of -65°C to +175°C, dissipating 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.

Feature Summary

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

Applications

• High power voltage regulation in aerospace systems
• Overvoltage protection in military electronic circuits
• Power supply stabilization in industrial equipment

Procurement Notes

Verify that the part number includes the 'R' suffix to confirm reverse polarity orientation where the cathode connects to the case. Ensure procurement specifications align with the required MIL-PRF-19500/358 qualification level if applicable. Confirm thermal management requirements match the 50 W dissipation rating at case temperatures below 75°C. Check for specific screening levels such as JAN or JANTXV if mandated by system reliability standards.

Selection Notes

Select this component when a robust 50 W Zener diode with a 14.0 V breakdown voltage is required for high-reliability applications. The reverse polarity option simplifies mounting configurations where the case must serve as the electrical connection point. Consider the wide operating temperature range and radiation hardness for deployment in extreme environmental conditions or space-grade hardware.

Part Context

This device is part of the Microsemi Scottsdale Division's extensive line of registered 1N3305 through 1N3350B Zener diodes. These components are designed to offer broad voltage regulation capabilities ranging from 3.9 V to 200 V. The series supports various military qualifications and is manufactured to meet stringent performance standards for critical infrastructure and defense electronics.

Replacement Considerations

Equivalent parts include other 1N3313 variants with standard or reversed polarity. Cross-reference with 1N45xx series devices for similar voltage ratings. Verify mechanical compatibility with the DO-5 hexagonal stud package before substitution.

FAQ

What does the 'R' suffix indicate in the part number 1N3313RA?

The 'R' suffix indicates reverse polarity, meaning the cathode is connected to the case instead of the standard anode-to-case configuration.

Is the 1N3313RA radiation hard?

Yes, the device is inherently radiation hard as described in Microsemi MicroNote 050.