1N3319A

Overview

The Microchip Technology 1N3319A 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 20 V at a test current of 630 mA. The device features a maximum dynamic impedance of 2.4 Ω and supports a maximum DC Zener current of 2,100 mA. It operates within a junction temperature range of -65°C to +175°C and utilizes a DO-5 (DO-203AB) package.

Feature Summary

• Hermetically sealed welded construction with internal solder bond for reliability
• Inherently radiation hard design suitable for harsh environments
• Capable of operating up to 50 W power dissipation with adequate heat sinking
• Standard polarity connects anode to case; reverse polarity available via suffix

Applications

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

Procurement Notes

Verify the specific tolerance suffix required for your application, as the 'A' suffix denotes +/-10% tolerance while 'B' indicates +/-5%. Confirm whether standard anode-to-case polarity or reverse polarity (indicated by an 'R' suffix) is needed. Ensure mounting hardware such as insulators or bushings are sourced separately if stud mounting is utilized. Check for military qualification prefixes like JAN or JANTX if screening per MIL-PRF-19500/358 is necessary.

Selection Notes

Select this component when high power handling and radiation hardness are critical. The 1N3319A offers a 20 V regulation point with significant current capacity. Consider the thermal resistance of 2.0 °C/W maximum when designing heat sinks. The DO-5 package requires specific mounting considerations due to its hexagonal stud design. Verify that the operating environment does not exceed the specified junction temperature limits.

Part Context

This device is part of the Microsemi Scottsdale Division's 1N3305 through 1N3350B series of 50 W Zener diodes. These components are designed for high-power voltage regulation tasks where standard small-signal diodes would fail. The series covers a wide voltage range from 3.9 V to 200 V, providing versatile options for industrial and military power supply designs.

Replacement Considerations

Equivalent parts include other 50 W Zener diodes in the DO-5 package with similar 20 V specifications. Military equivalents may require JAN or JANTX prefixes. Ensure any replacement matches the thermal resistance and power derating characteristics. Verify polarity configuration, as standard units have anode-to-case connection.