1N3349RB

Single Zener Diodes Overview

The JANTX1N3349RB is a high-power 50 W Zener diode manufactured by Microchip Technology. It provides voltage regulation with a nominal Zener voltage of 180 V at a test current of 68 mA. The device features a maximum dynamic impedance of 90 Ohms and a maximum reverse leakage current of 10 µA at 136.8 V. It operates within a junction and storage temperature range of -65°C to +175°C, utilizing a DO-5 (DO-203AB) package.

Single Zener Diodes Feature Summary

• Hermetically sealed welded metal and glass construction for environmental protection
• Internal solder bond construction ensuring mechanical stability
• Reverse polarity configuration with cathode connected to the case
• Inherently radiation hard design suitable for harsh environments

Single Zener Diodes Applications

• Voltage regulation in aerospace systems
• Power supply protection in defense electronics
• High-reliability industrial control circuits

Single Zener Diodes Procurement Notes

Verify the specific military qualification level required for your application, as this component represents a JANTX grade. Confirm that the reversed polarity orientation matches your circuit schematic, given the cathode-to-case connection. Ensure adequate heat sinking is planned to maintain the case temperature below 75°C during full 50 W operation to prevent power derating.

Single Zener Diodes Selection Notes

Select this component when a robust, hermetically sealed Zener diode is needed for high-voltage regulation up to 180 V. The JANTX grade offers enhanced screening compared to standard commercial parts. Consider the DO-5 stud mount requirement and verify thermal management capabilities for continuous 50 W dissipation in your enclosure design.

Single Zener Diodes Part Context

This part belongs to the 1N3305 through 1N3350B series of 50 Watt Zener diodes produced by Microchip's Scottsdale Division. These devices are registered with JEDEC and available in various voltage ratings from 3.9 V to 200 V. The series supports JAN, JANTX, and JANTXV military qualifications per MIL-PRF-19500/358 standards.

Single Zener Diodes Replacement Considerations

Compatible substitutes include other JANTX1N3349 variants or equivalent 180 V, 50 W Zener diodes in the DO-5 package from qualified manufacturers. Verify that any replacement maintains the same reversed polarity and hermetic sealing specifications.