1N3347A

Single Zener Diodes Overview

The Microchip Technology 1N3347A 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 160 V and a test current of 80 mA. The device features a maximum dynamic impedance of 80 Ohms at the test current and 450 Ohms at a knee current of 5 mA. It operates within a junction and storage temperature range of -65°C to +175°C, dissipating up to 50 watts when the case temperature is maintained below 75°C.

Single Zener Diodes Feature Summary

• Hermetically sealed welded metal and glass construction in an industry standard DO-5 package
• Internal solder bond construction for enhanced reliability
• Standard polarity configuration connects the anode directly to the hexagonal stud case
• Inherently radiation hard and non-sensitive to electrostatic discharge

Single Zener Diodes Applications

• Voltage regulation in high power industrial systems
• Overvoltage protection circuits requiring robust thermal performance
• Military and aerospace applications utilizing JAN, JANTX, or JANTXV qualifications

Single Zener Diodes Procurement Notes

Verify the specific suffix designation to confirm tolerance levels and polarity orientation before procurement. The 'A' suffix indicates a ten percent voltage tolerance, while the absence of a suffix denotes twenty percent. Confirm that the required military screening level matches the available JAN, JANTX, or JANTXV variants if operating in harsh environments. Ensure mounting hardware specifications align with the hexagonal stud requirements.

Single Zener Diodes Selection Notes

Select this component for applications demanding high power dissipation capabilities up to fifty watts. Verify that the system can maintain the case temperature below seventy-five degrees Celsius to utilize the full rated power. Consider the positive temperature coefficient inherent to voltages above seven volts when designing for wide temperature ranges. Ensure adequate heat sinking is provided to manage the thermal resistance effectively during continuous operation.

Single Zener Diodes Part Context

This part belongs to the extensive family of fifty watt Zener diodes manufactured by Microsemi's Scottsdale Division. The series spans from three point nine volts to two hundred volts, offering broad voltage regulation options. These components are designed for rugged environments where hermetic sealing and high power handling are critical. The manufacturing process emphasizes low thermal resistance and durable internal bonding techniques.

Single Zener Diodes Replacement Considerations

Equivalent parts include other fifty watt Zener diodes in the DO-5 package with matching voltage and tolerance ratings. Cross-referencing should verify identical thermal characteristics and hermetic sealing standards. Military qualified equivalents require matching MIL-PRF-19500/358 screening levels.