1N3321RA

Overview

The Microchip Technology 1N3321RA is a high-power 50 W Zener diode from the 1N3305-1N3350B series, housed in a hermetically sealed DO-5 (DO-203AB) stud-mount package. It features a nominal Zener voltage of 24 V with a ±10% tolerance and a maximum dynamic impedance of 2.6 Ohms at the test current of 520 mA. The device supports a maximum DC Zener current of 1750 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 electrical connections
• Reverse polarity configuration with cathode connected to the hexagonal base
• Inherently radiation hard and non-sensitive to electrostatic discharge

Applications

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

Procurement Notes

Verify that the specific part number includes the 'R' suffix to confirm reverse polarity (cathode-to-case), as standard units feature anode-to-case connection. Confirm the required tolerance level matches the 'A' suffix designation for ±10%. Ensure mounting hardware specifications align with the 11/16 inch hexagonal stud and 1/4-28 threads provided in the datasheet.

Selection Notes

Select this component when a 50 W power dissipation capability is required alongside precise voltage regulation. The DO-5 package necessitates direct stud mounting to a heat sink for optimal thermal performance above 75°C. Consider the reverse polarity requirement if the circuit design mandates the cathode be electrically tied to the chassis or mounting surface.

Part Context

This device belongs to the 1N3305 through 1N3350B series manufactured by Microchip Technology's Scottsdale Division. These components are JEDEC registered and designed for high-reliability environments. The series offers a wide selection of voltages ranging from 3.9 V to 200 V, catering to diverse power management needs in critical infrastructure.

Replacement Considerations

Public confirmed substitute part numbers include 1N3321B and 1N3321. Verify polarity orientation differences, as standard suffixes may indicate different terminal configurations compared to the reverse polarity 'R' variant.