1N3314RA

Overview

The Microchip Technology 1N3314RA is a high-power 50 W Zener diode from the 1N3305-1N3350B series, housed in a hermetically sealed DO-5 (DO-203AB) package. It features a nominal Zener voltage of 15 V with a ±10% tolerance and a maximum dynamic impedance of 1.4 Ohms at the test current of 830 mA. The device supports a maximum DC Zener current of 2,800 mA and operates within a junction temperature range of -65°C to +175°C. The 'R' suffix indicates reverse polarity, connecting the cathode to the case.

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 hexagonal stud
• Inherently radiation hard and non-sensitive to electrostatic discharge

Applications

• High power voltage regulation in industrial environments
• Power supply protection circuits requiring robust thermal performance
• Military and aerospace applications utilizing JAN or JANTX qualifications

Procurement Notes

Verify the specific revision level and manufacturing origin when sourcing this component, as historical production may involve Microsemi or Microchip Technology entities. Confirm that the reverse polarity designation matches the intended circuit topology, as standard units feature an anode-to-case connection. Ensure adequate heat sinking is planned, as the 50 W rating requires maintaining the case temperature below 75°C to prevent power derating.

Selection Notes

Select this component for applications demanding high surge capability and ruggedness in harsh environments. The DO-5 stud mount facilitates direct thermal transfer to chassis heatsinks. Consider the ±10% tolerance if tighter regulation is not required, or specify B/D suffixes for stricter tolerances. Evaluate the thermal resistance of 2.0°C/W maximum to ensure effective heat dissipation under continuous load conditions.

Part Context

This part belongs to the 1N3305 through 1N3350B series of 50 Watt Zener diodes. These components are designed for broad voltage regulation ranges from 3.9 V to 200 V. The series is JEDEC registered and available in various military screening levels, including JAN, JANTX, and JANTXV, to meet stringent reliability standards for defense and space electronics.

Replacement Considerations

Direct substitutes include other 1N3314 variants such as 1N3314A or 1N3314B, provided the polarity and tolerance requirements align. For reverse polarity needs, verify compatibility with other 1N33xxRB parts. Cross-reference with 1N45xxB series equivalents if pinout and voltage specifications match.