1N3327RB

Overview

The Microchip Technology 1N3327RB is a 50-watt Zener diode with a nominal voltage of 39V and a maximum dynamic impedance of 4 Ohms. It features reverse polarity (cathode to case) indicated by the 'R' suffix, offering ±5% tolerance. The device operates within a junction temperature range of -65°C to +175°C and utilizes a DO-5 (DO-203AB) stud mount package.

Feature Summary

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

Applications

• Voltage regulation in high-power circuits
• Protection against overvoltage transients
• Reference voltage sources in harsh environments

Procurement Notes

Verify that the specific part number includes the 'R' suffix to confirm reverse polarity orientation. Ensure mounting hardware matches the 11/16 inch hexagonal stud with 1/4-28 threads. Confirm thermal management requirements align with the 50W dissipation rating at case temperatures below 75°C.

Selection Notes

Select this component when a 39V Zener reference with reversed polarity is required. The DO-5 package facilitates direct stud mounting for efficient heat dissipation. Verify that the application environment does not exceed the specified operating temperature limits or require surface mount alternatives.

Part Context

This component belongs to the 1N3305 through 1N3350B series of high-power Zener diodes manufactured by Microchip Technology's Scottsdale Division. These devices are designed for robust performance in demanding applications requiring precise voltage regulation and high power handling capabilities.

Replacement Considerations

The 1N3327B is a parameter equivalent part but lacks the reverse polarity feature. Verify if standard polarity (anode to case) is acceptable before substitution.