1N3345A

Single Zener Diodes Overview

The Microchip Technology 1N3345A 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 140 V at a test current of 90 mA. The device features a maximum dynamic impedance of 60 Ohms and a maximum reverse current of 10 µA. It operates within a junction temperature range of -65°C to +175°C and utilizes a DO-5 (DO-203AB) hexagonal stud package for mounting.

Single Zener Diodes Feature Summary

• Hermetically sealed welded metal and glass construction
• Internal solder bond design
• Standard polarity connects anode to case
• Radiation hard characteristics

Single Zener Diodes Applications

• High power voltage regulation
• Industrial control systems
• Power supply protection circuits

Single Zener Diodes Procurement Notes

Verify the specific suffix requirements, as standard parts may lack military screening. Confirm thermal management needs for 50 W dissipation. Check for reverse polarity options using the R suffix if cathode-to-case connection is required. Ensure compatibility with MIL-PRF-19500/358 standards if JAN or JANTX qualifications are necessary for the application environment.

Single Zener Diodes Selection Notes

Select this component for applications requiring robust high-power voltage clamping in harsh environments. The DO-5 package facilitates direct chassis mounting for efficient heat sinking. Consider the +/- 5% tolerance associated with the B suffix for precision regulation. Evaluate thermal resistance limits to ensure operation remains within the specified derating curve above 75°C case temperature.

Single Zener Diodes Part Context

This part belongs to the 1N3305 through 1N3350B series of 50 W Zener diodes manufactured by Microsemi's Scottsdale Division. These devices are designed for high reliability and are available in various voltage ratings from 3.9 V to 200 V. The series supports military qualifications including JAN, JANTX, and JANTXV levels for specialized aerospace and defense applications.

Single Zener Diodes Replacement Considerations

Equivalent parts include the 1N4549B through 1N4556B series which share similar electrical characteristics and packaging. Verify mechanical dimensions and thread specifications when substituting to ensure proper mounting hardware compatibility.