1N4550A

Single Zener Diodes Overview

The Microchip Technology 1N4550A is a high-power 50 W Zener diode with a nominal voltage of 4.3 V at a test current of 2,900 mA. It features a maximum dynamic impedance of 0.16 ohms and a DC Zener current of 10,650 mA. The device operates within a junction temperature range of -65°C to +175°C and utilizes a DO-5 (DO-203AB) package with an 11/16 inch hexagonal stud.

Single Zener Diodes Feature Summary

• Hermetically sealed welded construction with internal solder bond
• Standard polarity connects the anode to the case
• Inherently radiation hard design
• Non-sensitive to electrostatic discharge

Single Zener Diodes Applications

• Voltage regulation in power supplies
• High power protection circuits
• Military and aerospace systems requiring MIL-PRF-19500/358 qualification

Single Zener Diodes Procurement Notes

Verify the specific suffix requirements for tolerance and polarity before ordering. Confirm that adequate heat sinking is provided to maintain the case temperature below 75°C for full 50 W dissipation. Check for availability of military qualifications if required by the application specifications.

Single Zener Diodes Selection Notes

Select this component for applications requiring robust voltage regulation at high power levels. Ensure the thermal management system can handle the specified power derating above 75°C. Consider the physical mounting constraints of the hexagonal stud package when designing the enclosure.

Single Zener Diodes Part Context

This part belongs to the 1N4549B through 1N4556B series of 50 W Zener diodes manufactured by Microsemi Scottsdale Division. These devices are JEDEC registered and designed for broad voltage regulation needs ranging from 3.9 V to 200 V.

Single Zener Diodes Replacement Considerations

Equivalent parts include other 50 W Zener diodes with a 4.3 V nominal rating and compatible DO-5 packaging. Verify thermal resistance and voltage tolerance specifications match the original design requirements.