1N3348B

Single Zener Diodes Overview

The Microchip Technology 1N3348B is a high-power 50-watt Zener diode within the JEDEC registered 1N3305 through 1N3350B series. It provides voltage regulation with a nominal Zener voltage of 175 volts at a test current of 70 mA. The device features a maximum dynamic impedance of 85 ohms and a maximum reverse current of 10 µA at its rated voltage. 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 reliable 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
• Industrial control systems requiring robust components
• Military applications utilizing JAN, JANTX, or JANTXV qualifications

Single Zener Diodes Procurement Notes

Verify the specific ordering suffix to confirm tolerance and polarity requirements. The 'B' suffix indicates a standard 5% voltage tolerance. An 'R' suffix denotes reversed polarity where the cathode connects to the case. Confirm thermal management needs as power derating applies above 75°C stud temperature. Ensure compatibility with DO-5 mounting hardware for proper installation.

Single Zener Diodes Selection Notes

Select this component for applications requiring high power dissipation capabilities in a rugged package. The 175-volt rating suits medium-to-high voltage regulation tasks. Consider the 85-ohm dynamic impedance for noise sensitivity. Verify that the operating environment stays within the specified temperature limits. Evaluate the need for military screening if used in defense-grade equipment.

Single Zener Diodes 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 applications using a DO-5 (DO-203AB) hexagonal stud package. The series covers a broad voltage range from 3.9V to 200V, offering versatile regulation options for industrial and military electronics.

Single Zener Diodes Replacement Considerations

Equivalent parts include other 50W Zener diodes in the DO-5 package with matching 175V ratings. Verify pinout compatibility, specifically the anode-to-case standard polarity. Check thermal resistance values to ensure adequate heat sinking performance matches the original specification.