1N4554RB

Single Zener Diodes Overview

The Microchip Technology 1N4554RB is a high-power 50 W Zener diode with a nominal voltage of 6.2 V and ±5% tolerance. It operates within a junction temperature range of -65°C to +175°C and features a maximum DC power dissipation of 50 watts at a case temperature below 75°C. The device utilizes a DO-5 (DO-203AB) package with hexagonal stud mounting. Electrical characteristics include a test current of 2,000 mA, a dynamic impedance of 0.14 Ohms, and a maximum reverse leakage current of 20 µA at 2 V.

Single Zener Diodes Feature Summary

• Hermetically sealed welded metal and glass construction for environmental protection
• Internal solder bond design ensuring robust mechanical integrity
• Reverse polarity configuration with cathode connected to the case
• Inherently radiation hard and non-sensitive to electrostatic discharge

Single Zener Diodes Applications

• Voltage regulation in aerospace and defense systems
• High-power industrial equipment requiring rugged components
• Military applications utilizing JAN, JANTX, or JANTXV qualifications

Single Zener Diodes Procurement Notes

Verify that the specific order includes the 'R' suffix to confirm reversed polarity (cathode to case). Confirm the required military screening level (JAN, JANTX, or JANTXV) if applicable, as these require specific prefixes. Ensure thermal management designs account for the 0.5 W/°C derating factor above 75°C case temperature to maintain safe operating limits.

Single Zener Diodes Selection Notes

Select this component when a 6.2 V reference with high power handling is required. The DO-5 stud mount facilitates direct heat sinking to chassis structures. Verify that the application environment supports the specified -65°C to +175°C operating range. Consider the inherent radiation hardness for space or high-altitude deployments where standard silicon devices may fail.

Single Zener Diodes Part Context

This part belongs to the 1N4549B through 1N4556B series of 50 W Zener diodes manufactured by Microchip Technology's Scottsdale Division. These devices are JEDEC registered and offer a broad voltage selection from 3.9 V to 200 V. The series provides standardized high-power regulation solutions compatible with industry-standard mounting hardware.

Single Zener Diodes Replacement Considerations

Equivalent parts within the same series include 1N4553B and 1N4555B. Cross-referencing requires matching the 6.2 V nominal voltage, 50 W power rating, and DO-5 package dimensions. Verify polarity requirements, as standard units feature anode-to-case connections while this RB variant uses cathode-to-case.

Single Zener Diodes FAQ

What does the 'R' suffix indicate in the part number?

The 'R' suffix signifies reversed polarity, meaning the cathode is connected to the case instead of the standard anode-to-case configuration.

How is the Zener voltage measured?

The Zener voltage is measured with the junction in thermal equilibrium at a 30°C stud temperature.