1N4555RB

Single Zener Diodes Overview

The Microchip Technology 1N4555RB is a high-power 50 W Zener diode from the 1N4549B-1N4556B series, housed in a hermetically sealed DO-5 (DO-203AB) metal-glass package. It features a nominal Zener voltage of 6.8 V with a ±5% tolerance and a maximum dynamic impedance of 0.16 Ω at a test current of 1,850 mA. The device utilizes internal solder bond construction and offers reverse polarity configuration, where the cathode is connected to the case. It operates within a junction temperature range of -65°C to +175°C and provides inherent radiation hardness.

Single Zener Diodes Feature Summary

• Hermetically sealed welded metal-glass construction for durability
• Internal solder bond construction for reliability
• Inherently radiation hard design
• Reverse polarity option with cathode-to-case connection

Single Zener Diodes Applications

• High power voltage regulation
• Aerospace and defense systems
• Harsh environment electronics

Single Zener Diodes Procurement Notes

Verify that the specific part number includes the 'R' suffix to confirm the reverse polarity configuration (cathode to case). Ensure the procurement documentation specifies the 'B' suffix for the required ±5% Zener voltage tolerance. Confirm compliance with relevant military screening standards if applicable to the end-use application.

Single Zener Diodes Selection Notes

Select this component when a 50 W power dissipation capability is required alongside a 6.8 V reference. The DO-5 stud mount package necessitates appropriate thermal management hardware. Consider the reverse polarity requirement carefully, as the standard version connects the anode to the case.

Single Zener Diodes Part Context

This component belongs to the Microsemi Scottsdale Division's 1N4549B through 1N4556B series of 50 Watt Zener diodes. These devices are designed for robust applications requiring broad voltage regulation capabilities up to 200 V. The series is also available in JAN, JANTX, and JANTXV military qualifications per MIL-PRF-19500/358.

Single Zener Diodes Replacement Considerations

Equivalent parts include the 1N3305B, which shares the same JEDEC registration and electrical characteristics within the 1N3305-1N3350B series.