1N4550RB

Single Zener Diodes Overview

The Microchip Technology 1N4550RB is a 50-watt Zener diode with a nominal voltage of 4.3V and a test current of 2,900mA. It features a maximum dynamic impedance of 0.16 ohms at the test current and 500 ohms at 5mA. The device has a maximum DC Zener current of 10,650mA and a reverse current of 150µA at 0.5V. It operates within a junction temperature range of -65°C to +175°C and utilizes a DO-5 (DO-203AB) package with hexagonal stud mounting.

Single Zener Diodes Feature Summary

• Hermetically sealed welded metal and glass construction
• Internal solder bond design for reliability
• Reverse polarity configuration with cathode connected to case
• Inherently radiation hard

Single Zener Diodes Applications

• Voltage regulation in high power applications
• Military and aerospace systems requiring MIL-PRF-19500/358 qualification
• Equipment sensitive to electrostatic discharge

Single Zener Diodes Procurement Notes

Verify that the specific part number includes the 'R' suffix to confirm reversed polarity (cathode to case). Confirm the 'B' suffix indicates the required +/- 5% Zener voltage tolerance. Ensure the procurement documentation references the correct JEDEC registration numbers and any applicable military screening levels if required by the system specifications.

Single Zener Diodes Selection Notes

Select this component when a 50-watt power dissipation capability is necessary alongside a 4.3V regulation point. The reversed polarity design is critical for applications where the case must serve as the cathode terminal. Verify that the thermal management system can maintain the case temperature below 75°C to utilize the full rated power without derating.

Single Zener Diodes Part Context

This component belongs to the 1N4549B through 1N4556B series of high-power Zener diodes manufactured by Microsemi's Scottsdale Division. These devices are registered under JEDEC standards and offer a broad voltage selection from 3.9V to 200V. The series is designed for robust operation in demanding environments, providing low thermal resistance and high surge handling capabilities.

Single Zener Diodes Replacement Considerations

Equivalent parts include the standard polarity 1N4550B or the generic 1N4550. For reversed polarity requirements, verify compatibility with other 1N4550RB variants or consult the manufacturer for surface mount equivalents.