1N3317B

Overview

The Microchip Technology 1N3317B is a high-power 50 W Zener diode from the JEDEC registered 1N3305 through 1N3350B series. It provides voltage regulation with a nominal Zener voltage of 18 V at a test current of 700 mA. The device features a maximum dynamic impedance of 2.0 ohms and a maximum reverse current of 10 µA. It operates within a junction temperature range of -65°C to +175°C and utilizes a DO-5 (DO-203AB) package.

Feature Summary

• Hermetically sealed welded construction with internal solder bond
• Radiation hard design inherent to the component structure
• Non-sensitive to electrostatic discharge per MIL-STD-750 Method 1020

Applications

• Voltage regulation in military and aerospace systems
• High power dissipation circuits requiring robust thermal management
• Harsh environment applications necessitating radiation hardness

Procurement Notes

Verify the specific suffix requirements for tolerance and polarity before ordering, as standard units use an anode-to-case configuration while reversed polarity requires an 'R' suffix. Confirm that the procurement channel supports factory-direct or authorized distribution for this specialized component type. Ensure all technical specifications align with the system's thermal and electrical constraints prior to finalizing the purchase order.

Selection Notes

Select this component when a 50 W power rating and 18 V regulation point are required in a ruggedized package. Consider the DO-5 stud mount for efficient heat sinking. Evaluate the need for military screening levels if operating in extreme environments. Verify that the system can accommodate the specific thermal resistance characteristics and mounting hardware requirements defined in the datasheet.

Part Context

This part belongs to the 1N3305 through 1N3350B series manufactured by Microsemi, now part of Microchip Technology. These devices are designed for high-power applications and are available in various military qualifications including JAN, JANTX, and JANTXV. The series covers a broad voltage range from 3.9 V to 200 V, providing versatile options for industrial and defense electronics.

Replacement Considerations

Equivalent parts include other 50 W Zener diodes with matching 18 V ratings and DO-5 packages. Verify compatibility regarding thermal resistance, pinout orientation, and hermetic sealing standards. Cross-reference with MIL-S-19500/358 specifications to ensure functional equivalence in military-grade applications.