1N3308B

Overview

The Microchip Technology 1N3308B 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 9.1 V at a test current of 1,370 mA. The device features a maximum dynamic impedance of 0.50 Ohms and supports a maximum DC Zener current of 4,800 mA. It operates within a junction and storage temperature range of -65°C to +175°C, utilizing a DO-5 (DO-203AB) case with an internal solder bond construction.

Feature Summary

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

Applications

• Voltage regulation in power supplies requiring broad operating ranges
• Protection circuits in aerospace and defense systems
• High-power dissipation applications with adequate heat sinking
• Military qualification electronics per MIL-PRF-19500/358 standards

Procurement Notes

Verify the specific suffix requirements for tolerance and polarity before ordering. The 'B' suffix indicates a standard +/- 5% voltage tolerance. Confirm if reverse polarity is needed by checking for the 'R' designation. Ensure mounting hardware matches the 11/16 inch hexagonal stud specifications. Consult factory documentation for surface mount equivalents or specialized screening levels like JANTX.

Selection Notes

Select this component when high power dissipation up to 50 W is required alongside precise voltage regulation. Consider the thermal resistance of 2.0°C/W maximum when designing heat sinks. Evaluate the need for military screening levels if operating in extreme conditions. Verify that the application can accommodate the DO-5 package dimensions and stud mounting requirements.

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 where reliable voltage regulation is critical. The series offers a wide selection of voltages ranging from 3.9 V to 200 V, catering to diverse industrial and military electronic needs.

Replacement Considerations

Equivalent parts include other 50 W Zener diodes with similar voltage ratings and DO-5 packaging. Verify compatibility with MIL-PRF-19500/358 standards if military qualification is required. Check for matching thermal resistance and power derating curves to ensure proper heat management in the new design.