1N4551A

Single Zener Diodes Overview

The Microchip Technology 1N4551A is a high-power 50 W Zener diode designed for voltage regulation within the 1N4549B through 1N4556B series. It provides a nominal Zener voltage of 4.7 V with a standard tolerance of ±10%. The device operates at a test current (IZT) of 2,650 mA and features a maximum dynamic impedance (ZZT) of 0.12 Ohms. It utilizes a hermetically sealed DO-5 (DO-203AB) package with an 11/16 inch hexagonal stud for mounting. The component supports junction temperatures from -65°C to +175°C and includes internal solder bond construction.

Single Zener Diodes Feature Summary

• Hermetically sealed welded metal and glass construction
• Internal solder bond construction
• Inherently radiation hard design
• Non-sensitive to electrostatic discharge

Single Zener Diodes Applications

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

Single Zener Diodes Procurement Notes

Verify that the specific part number matches the required polarity configuration, as standard units feature an anode-to-case connection while reverse polarity variants require an 'R' suffix. Confirm that the procurement documentation explicitly references the JEDEC registered 1N4551 designation to ensure compliance with the specified electrical characteristics and mechanical dimensions provided in the official datasheet.

Single Zener Diodes Selection Notes

Select this component when a robust 50 W power dissipation capability is required alongside a precise 4.7 V reference point. The low thermal resistance facilitates efficient heat transfer via the hexagonal base stud. Ensure the application environment accommodates the wide operating temperature range and consider the physical mounting requirements associated with the DO-5 stud mount package.

Single Zener Diodes Part Context

This device belongs to the Microsemi Scottsdale Division series of 50 Watt Zener diodes, encompassing the 1N3305 through 1N3350B and 1N4549 through 1N4556B families. These components are engineered for broad voltage regulation ranges up to 200 V. The 1N4551A specifically addresses mid-range voltage needs within this high-power portfolio, offering reliability suitable for demanding industrial and defense applications.

Single Zener Diodes Replacement Considerations

Equivalent parts include the 1N3307B, which shares identical electrical specifications and the same JEDEC registration within the parallel product family.