1N3317A

Overview

The Microchip Technology 1N3317A is a high-power 50 W Zener diode housed in a DO-5 (DO-203AB) stud mount package. It provides an 18 V nominal Zener voltage with a ±10% tolerance. The device operates within a junction and storage temperature range of -65°C to +175°C. Key electrical characteristics include a maximum dynamic impedance of 2 Ohms at the test current, a forward voltage of 1.5 V at 10 A, and a maximum reverse leakage current of 10 µA at 13.7 V.

Feature Summary

• Hermetically sealed welded metal and glass construction for durability
• Internal solder bond design ensuring structural integrity
• Standard polarity configuration with anode connected to the case
• Radiation hard performance suitable for harsh environments

Applications

• Voltage regulation in power supplies requiring broad operating ranges
• High power dissipation applications with adequate heat sinking
• Military and aerospace systems utilizing JAN or JANTX qualifications

Procurement Notes

Verify the specific suffix requirements when ordering, as they define tolerance levels and polarity configurations. Confirm that the application environment supports the specified thermal resistance and mounting hardware constraints. Ensure compliance with RoHS status if applicable to the project specifications.

Selection Notes

Select this component for applications demanding high power handling capabilities up to 50 watts. Consider the DO-5 package dimensions and hexagonal stud mounting requirements during PCB layout. Evaluate thermal management strategies to maintain junction temperatures below the maximum rating under full load conditions.

Part Context

This part belongs to the 1N3305 through 1N3350B series of 50 Watt Zener diodes manufactured by Microchip Technology. These devices are designed for robust voltage regulation tasks where standard surface-mount packages cannot handle the required power dissipation. The series offers a wide selection of voltage ratings across the JEDEC registered numbering system.

Replacement Considerations

Compatible substitutes include other parts from the 1N3305–1N3350B series or the 1N4549B–1N4556B series, provided they match the 18 V specification and DO-5 package form factor. Verify equivalent thermal resistance and power derating curves before implementation.