1N3312RA

Overview

The Microchip Technology 1N3312RA 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 13 V with a ±10% tolerance and a maximum dynamic impedance of 1.1 Ohms at the test current of 960 mA. The device supports a maximum DC Zener current of 3,300 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 case
• Inherently radiation hard and non-sensitive to electrostatic discharge

Applications

• Voltage regulation in high-power industrial systems
• Protection circuits requiring broad operating current ranges
• Harsh environment applications utilizing military qualifications

Procurement Notes

Verify that the specific part number includes the 'R' suffix to confirm reverse polarity orientation, as standard units feature anode-to-case connections. Confirm the required tolerance level matches the 'A' suffix designation for ±10% accuracy. Ensure mounting hardware specifications align with the hexagonal stud requirements for proper thermal management and electrical isolation.

Selection Notes

Select this component when high power dissipation up to 50 W is required alongside strict environmental sealing. The DO-5 package facilitates base or stud mounting for efficient heat transfer. Consider the reverse polarity option if system grounding requires the cathode to be electrically common with the chassis or heatsink structure.

Part Context

This device belongs to the Microsemi Scottsdale Division 1N3305 through 1N3350B series of 50 Watt Zener diodes. These components are designed for applications demanding high power handling and reliability. The series offers a wide selection of voltages ranging from 3.9 V to 200 V, catering to diverse regulation needs in rugged electronic designs.

Replacement Considerations

The 1N3312B serves as the parameter-equivalent standard polarity alternative. For identical specifications but with reversed polarity, the 1N3312RA is the direct match. Verify that any substitute maintains the DO-5 package dimensions and hermetic seal characteristics.