1N4555B

Single Zener Diodes Overview

The Microchip Technology 1N4555B is a high-power 50 W Zener diode from the 1N4549B through 1N4556B series. It provides voltage regulation with a nominal Zener voltage of 6.8 V at a test current of 1,850 mA. The device features a maximum dynamic impedance (Zzt) of 0.16 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 with a hexagonal stud.

Single Zener Diodes Feature Summary

• Hermetically sealed welded metal and glass construction
• Internal solder bond design for reliability
• Standard polarity connects anode to case
• Inherently radiation hard

Single Zener Diodes Applications

• High power voltage regulation
• Circuits requiring broad operating current ranges
• Applications demanding low thermal resistance

Single Zener Diodes Procurement Notes

Verify that the component matches the specific JEDEC registered part number 1N4555B. Confirm the required tolerance level, as the 'B' suffix indicates a standard +/- 5% voltage tolerance. Ensure the mounting hardware supports the DO-5 hexagonal stud configuration. Check for any necessary military qualification prefixes if environmental screening is required.

Single Zener Diodes Selection Notes

Select this component when a 6.8 V regulation point is needed at high power levels up to 50 W. Consider the thermal resistance of 2.0°C/W maximum when designing heat sinking solutions. Verify that the application environment accommodates the specified operating temperature range and that the physical dimensions of the DO-5 package fit the mechanical constraints.

Single Zener Diodes Part Context

This part belongs to the Microsemi Scottsdale Division series of 50 Watt Zener Diodes. The series covers a broad voltage range from 3.9 V to 200 V. These devices are designed for robust performance in demanding environments, offering options for various voltage tolerances and polarities within the same family structure.

Single Zener Diodes Replacement Considerations

Consult the manufacturer for surface mount equivalents or alternative parts within the 1N3305 through 1N3350B series that match the specific voltage and power requirements.