1N3347B

Single Zener Diodes Overview

The Microchip Technology 1N3347B is a high-power 50 W Zener diode within the JEDEC registered 1N3305 through 1N3350B series. It provides voltage regulation at a nominal Zener voltage of 160 V with a ±5% tolerance, indicated by the 'B' suffix. The device operates with a test current (IZT) of 80 mA and exhibits a maximum dynamic impedance (ZZT) of 80 Ohms at this current level. It features a hermetically sealed DO-5 (DO-203AB) package with an internal solder bond construction. The component supports a maximum DC Zener current (IZM) of 250 mA and maintains a typical temperature coefficient of +0.095 %/°C.

Single Zener Diodes Feature Summary

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

Single Zener Diodes Applications

• Voltage regulation in power supplies requiring high power dissipation
• Protection circuits in aerospace and military systems
• Industrial equipment operating under extreme thermal conditions
• Reference voltage sources in high-voltage applications

Single Zener Diodes Procurement Notes

Verify that the specific order includes the correct polarity designation, as standard units feature an anode-to-case connection. Confirm that the application environment allows for adequate heat sinking to manage the 50 W power dissipation rating. Ensure mounting hardware matches the 11/16 inch hexagonal stud specifications. Check for any required military qualification prefixes if enhanced screening is necessary for the deployment.

Single Zener Diodes Selection Notes

Select the 1N3347B when a stable 160 V reference is needed with significant power handling capabilities. The DO-5 package requires direct stud mounting to chassis or heatsinks to maintain thermal performance. Consider the positive temperature coefficient for circuit stability over wide temperature ranges. Evaluate the need for reverse polarity variants if cathode-to-case connections are preferred for the specific assembly layout.

Single Zener Diodes Part Context

This component belongs to the 1N3305 through 1N3350B series of 50 Watt Zener diodes manufactured by Microsemi's Scottsdale Division. These devices are designed for high-power applications where traditional small-signal diodes would fail due to thermal limitations. The series covers a broad voltage range from 3.9 V to 200 V, allowing designers to select precise breakdown voltages while maintaining consistent mechanical and thermal characteristics across the product line.

Single Zener Diodes Replacement Considerations

Equivalent parts include other 50 W Zener diodes in the DO-5 package with a 160 V nominal voltage and ±5% tolerance. Verify that substitute components meet the same thermal resistance and power derating requirements. Military qualified versions such as JANTX1N3347B may be used if higher screening levels are required.