1N3317RA

Overview

The Microchip Technology 1N3317RA 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 16.0 V at a test current of 780 mA. The device features a maximum dynamic impedance of 2.60 ohms and supports a maximum DC Zener current of 1,750 mA. It operates within a junction and storage temperature range of -65°C to +175°C. The 'R' suffix indicates reverse polarity (cathode to case), while the absence of an A or B tolerance suffix denotes a standard voltage tolerance of +/-20%.

Feature Summary

• Hermetically sealed welded construction with internal solder bond for reliability
• Inherently radiation hard design suitable for harsh environments
• Non-sensitive to electrostatic discharge per MIL-STD-750 Method 1020
• Low thermal resistance junction-to-hexagonal base for efficient heat dissipation

Applications

• High power voltage regulation in industrial systems
• Protection circuits requiring robust thermal performance
• Military and aerospace applications utilizing radiation-hardened components

Procurement Notes

Verify the specific ordering suffixes against official documentation to confirm polarity and tolerance requirements. The 'R' suffix confirms reversed polarity orientation. Ensure mounting hardware matches the DO-5 hexagonal stud specifications. Confirm that the application environment stays within the specified thermal derating curves to maintain the rated 50 W power dissipation capability safely.

Selection Notes

Select this component when high power handling and radiation hardness are required. The DO-5 package allows direct mounting to heatsinks via the hexagonal stud. Verify that the system voltage does not exceed the breakdown characteristics. Consider the thermal resistance limits when designing the cooling solution to prevent junction temperature excursions beyond the maximum rating.

Part Context

This part belongs to the Microsemi Scottsdale Division 1N3305 through 1N3350B series of 50 Watt Zener diodes. These devices are designed for broad voltage regulation ranges from 3.9 V to 200 V. The series includes military qualifications such as JAN, JANTX, and JANTXV available by adding specific prefixes to the part number.

Replacement Considerations

Consult the manufacturer for surface mount equivalents or direct replacements within the same power and voltage class. Verify mechanical compatibility with the DO-5 package dimensions and thread specifications before substitution.