1N4553B

Single Zener Diodes Overview

The Microchip Technology 1N4553B is a high-power 50 W Zener diode within the 1N4549B through 1N4556B series. It provides voltage regulation with a nominal Zener voltage of 5.6 V at a test current of 2,250 mA. The device features a maximum dynamic impedance of 0.12 ohms and a maximum reverse current of 20 µA. Standard polarity connects the anode to the case, while reverse polarity is available via an 'R' suffix. It operates within a junction temperature range of -65°C to +175°C.

Single Zener Diodes Feature Summary

• Hermetically sealed welded construction with internal solder bond
• Inherently radiation hard design
• Non-sensitive to electrostatic discharge (ESD)
• Low thermal resistance for high power dissipation

Single Zener Diodes Applications

• High power voltage regulation
• Military and aerospace screening applications
• Harsh environment electronic circuits

Single Zener Diodes Procurement Notes

Verify the specific part number against the official datasheet to confirm tolerance and polarity requirements. Ensure that the mounting hardware and heat sinking capabilities align with the 50 W power dissipation rating and thermal derating curves specified in the documentation. Confirm compliance with relevant military specifications if required for the application.

Single Zener Diodes Selection Notes

Select this component for applications requiring robust voltage regulation under high power conditions. Consider the DO-5 package for stud mounting and verify the thermal management strategy to maintain junction temperatures within limits. Evaluate the need for reverse polarity or specific military qualifications based on system constraints.

Single Zener Diodes Part Context

This component belongs to the 1N4549B through 1N4556B series of 50 W Zener diodes manufactured by Microsemi (now Microchip Technology). These devices are designed for broad voltage regulation ranges and are suitable for demanding environments where reliability and radiation hardness are critical factors.

Single Zener Diodes Replacement Considerations

Consult the manufacturer for surface mount equivalents or alternative part numbers within the same series that match the required voltage and power specifications.