1N4553RB

Single Zener Diodes Overview

The Microchip Technology 1N4553RB is a high-power 50 W Zener diode from the 1N4549B through 1N4556B series. It provides voltage regulation with a nominal Zener voltage of 5.6 V at a test current of 2,250 mA and a tolerance of ±5%. The device features a maximum dynamic impedance of 0.12 Ω and a reverse leakage current of 20 µA at 1.0 V. It operates within a junction temperature range of -65°C to +175°C and dissipates up to 50 watts at a case temperature below 75°C. The component utilizes a DO-5 (DO-203AB) package with an 11/16 inch hexagonal stud.

Single Zener Diodes Feature Summary

• Hermetically sealed welded metal and glass construction with internal solder bond
• Reverse polarity configuration where cathode connects to the case
• Inherently radiation hard design suitable for harsh environments
• Non-sensitive to electrostatic discharge per MIL-STD-750 Method 1020

Single Zener Diodes Applications

• Voltage regulation in power supplies requiring broad operating current ranges
• High-power protection circuits utilizing adequate mounting and heat sinking
• Military and aerospace systems requiring radiation-hardened components

Single Zener Diodes Procurement Notes

Verify that the specific part number includes the 'R' suffix to confirm reversed polarity (cathode to case), as standard units feature anode-to-case polarity. Ensure thermal management solutions support the 50 W dissipation rating and maintain the case temperature below 75°C to prevent power derating. Confirm compliance with required military screening levels if applicable.

Single Zener Diodes Selection Notes

Select this component when high power handling capability and radiation hardness are required. The 1N4553RB offers a 5.6 V regulation point with tight ±5% tolerance. Consider the DO-5 stud mount package for direct chassis attachment. Verify that the application can accommodate the significant forward current requirements and thermal resistance characteristics specified in the datasheet.

Single Zener Diodes Part Context

This device belongs to the Microsemi Scottsdale Division 1N4549B through 1N4556B series of 50 W Zener diodes. These parts provide voltage regulation across a broad range from 3.9 V to 200 V. The series is JEDEC registered and available in various military qualifications including JAN, JANTX, and JANTXV by adding specific prefixes to the part number.

Single Zener Diodes Replacement Considerations

Equivalent parts include the 1N4553B. Verify polarity orientation carefully, as the standard 1N4553B has anode-to-case polarity while the RB variant has cathode-to-case polarity.