1N3343A

Single Zener Diodes Overview

The Microchip Technology 1N3343A 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 120 V at a test current of 100 mA. The device features a maximum dynamic impedance of 40 Ohms and a maximum reverse current of 10 µA. It operates within a junction temperature range of -65°C to +175°C and dissipates up to 50 watts when mounted on a heat sink maintained below 75°C.

Single Zener Diodes Feature Summary

• Hermetically sealed welded metal and glass construction for durability
• Internal solder bond design ensuring robust electrical connections
• Standard polarity configuration with anode connected to the case
• Inherently radiation hard characteristics suitable for harsh environments

Single Zener Diodes Applications

• High power voltage regulation circuits
• Overvoltage protection systems
• Reference voltage generation in industrial equipment
• Power supply stabilization modules

Single Zener Diodes Procurement Notes

Verify that the specific part number matches the required tolerance suffix, as standard units without a suffix carry a wider voltage tolerance than those designated with a B suffix. Confirm the mounting hardware requirements, including insulators or bushings, are sourced separately from the manufacturer if not included in the initial order. Ensure thermal management solutions support the specified derating curve above 75 degrees Celsius stud temperature.

Single Zener Diodes Selection Notes

Select this component for applications requiring high power dissipation capabilities and strict environmental sealing. The DO-5 package allows for direct stud mounting to chassis heatsinks. Consider the reverse polarity option by adding an R suffix if the cathode-to-case connection is necessary for the circuit topology. Verify that the system can accommodate the physical dimensions and weight of the hexagonal stud package.

Single Zener Diodes Part Context

This component is part of the broader 1N3305 through 1N3350B series manufactured by Microsemi's Scottsdale Division. The series covers a wide voltage range from 3.9 V to 200 V, offering various power ratings and tolerance options. These devices are designed for demanding applications where reliability and radiation hardness are critical factors.

Single Zener Diodes Replacement Considerations

Equivalent parts include other 50 W Zener diodes in the DO-5 package with matching 120 V specifications. Cross-referencing should focus on dynamic impedance and thermal resistance values to ensure identical performance under load.