1N3319B

Overview

The Microchip Technology 1N3319B is a high-power 50 W Zener diode from the JEDEC registered 1N3305 through 1N3350B series. It provides voltage regulation with a nominal Zener voltage of 20 V at a test current of 630 mA and a maximum dynamic impedance of 2.4 Ω. The device features a hermetically sealed DO-5 (DO-203AB) metal and glass package with an 11/16 inch hexagonal stud. It operates within a junction and storage temperature range of -65°C to +175°C, supporting up to 50 W power dissipation with adequate heat sinking.

Feature Summary

• Hermetically sealed welded construction for durability
• Internal solder bond design
• Inherently radiation hard characteristics
• ESD nonsensitive per MIL-STD-750 Method 1020

Applications

• Voltage regulation in broad operating current ranges
• High power industrial applications requiring robust thermal management
• Military and aerospace systems utilizing JAN, JANTX, or JANTXV qualifications

Procurement Notes

Verify the specific ordering suffix to confirm polarity and tolerance requirements. The 'B' suffix indicates a standard 5% voltage tolerance. An 'R' suffix denotes reverse polarity where the cathode connects to the case. Ensure the procurement specification matches the required military qualification level if applicable, as these are available under MIL-PRF-19500/358 standards.

Selection Notes

Select this component for applications demanding high power handling and rugged environmental performance. The DO-5 package requires mounting hardware compatible with the 11/16 inch hexagonal stud and 1/4-28 threads. Consider thermal resistance limits and derating curves when designing heat sinks to maintain junction temperatures within the specified operational range.

Part Context

This part belongs to the Microsemi Scottsdale Division 1N3305 through 1N3350B series of 50 Watt Zener diodes. These devices are designed for high-power voltage regulation tasks. The series offers a wide selection of voltages ranging from 3.9 V to 200 V, catering to diverse industrial and military electronic circuit requirements.

Replacement Considerations

Consult the manufacturer for surface mount equivalents. Verify compatibility with existing mounting hardware due to the specific DO-5 stud dimensions.