1N4563RB

Single Zener Diodes Overview

The Microchip Technology 1N4563RB is a silicon unidirectional Zener diode with a nominal voltage of 6.8 V and a power rating of 50 W. It features a TO-3 (TO-204AD) flange mount package with the cathode connected to the case. The device offers a voltage tolerance of 5% and operates within a junction temperature range of -65 °C to 175 °C. Key electrical characteristics include a maximum dynamic impedance of 0.16 Ω and a knee impedance of 200 Ω.

Single Zener Diodes Feature Summary

• Hermetically sealed welded construction for environmental durability
• Internal solder bond construction for mechanical stability
• Low thermal resistance enabling operation up to 50 W with adequate heat sinking
• Standard polarity configuration with anode to case

Single Zener Diodes Applications

• Voltage regulation across broad operating current ranges
• High-power circuit protection applications
• Military and aerospace systems requiring MIL-PRF-19500/114 qualification

Single Zener Diodes Procurement Notes

Verify specific ordering suffixes to confirm exact voltage tolerance, reverse polarity options, and military qualification levels such as JAN, JANTX, or JANTXV. Confirm RoHS compliance status, as commercial versions may differ from qualified military grades. Ensure mounting hardware supports the TO-3 flange design and that thermal management meets the 50 W dissipation requirements.

Single Zener Diodes Selection Notes

Select this component for high-power voltage regulation where hermetic sealing and radiation hardness are required. The TO-3 package facilitates direct chassis mounting. Verify that the 6.8 V breakdown voltage aligns with system requirements and that the 5% tolerance meets circuit precision needs. Consider thermal resistance limits when designing heat sinks for continuous 50 W operation.

Single Zener Diodes Part Context

The 1N4563RB belongs to a series of 50 Watt Zener diodes registered with JEDEC, covering voltage values from 3.9 V to 200 V. This family includes variants like 1N2804B through 1N2846B and 1N4557B through 1N4564RB. These devices are designed for robust performance in demanding environments, offering both standard and reverse polarity configurations.

Single Zener Diodes Replacement Considerations

Compatible substitutes include other 50 W Zener diodes in the TO-3 package with a 6.8 V nominal voltage and 5% tolerance. Ensure replacements maintain hermetic sealing if used in military or aerospace contexts. Verify that alternative parts support the same cathode-to-case connection and meet the required thermal and electrical specifications.