1N4551B

Single Zener Diodes Overview

The Microchip Technology 1N4551B is a high-power 50 W Zener diode within 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 of 0.16 Ohms and a maximum reverse current of 300 µA at 4.5 V. It operates within a junction temperature range of -65°C to +175°C and utilizes a DO-5 (DO-203AB) stud mount package.

Single Zener Diodes Feature Summary

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

Single Zener Diodes Applications

• High power voltage regulation circuits
• Military and aerospace electronic systems
• Industrial equipment requiring robust thermal performance

Single Zener Diodes Procurement Notes

Verify that the component matches the specific Microsemi or Microchip datasheet specifications for the 1N4551B. Confirm the package type is DO-5 and check for any required military qualification prefixes such as JAN or JANTX if applicable to your project requirements. Ensure proper heat sinking is planned for the 50 W dissipation rating.

Single Zener Diodes Selection Notes

Select this component when a 6.8 V regulation point is required in high power applications. The DO-5 stud mount package facilitates direct mounting to heatsinks. Consider the low thermal resistance of 2.0 °C/W maximum for efficient heat transfer. Verify that the operating current does not exceed the maximum DC Zener current of 6,650 mA.

Single Zener Diodes Part Context

This part belongs to the 1N3305 through 1N3350B and 1N4549B through 1N4556B series of 50 Watt Zener diodes originally manufactured by Microsemi Scottsdale Division. These devices are designed for broad voltage ranges from 3.9 V to 200 V. The series is known for its ruggedness and availability in various military screening levels.

Single Zener Diodes Replacement Considerations

Equivalent parts include other 50 W Zener diodes with 6.8 V nominal voltage and DO-5 packages. Cross-reference with 1N3310B which shares similar electrical characteristics within the same product family.