1N3326B

Overview

The Microchip Technology 1N3326B is a high-power 50 W Zener diode from the JEDEC registered 1N3305 through 1N3350B series. It provides voltage regulation with a nominal Zener voltage of 36 V at a test current of 350 mA. The device features a maximum dynamic impedance of 3.5 ohms and a maximum reverse current of 10 µA at its rated voltage. It operates within a junction temperature range of -65°C to +175°C and utilizes a DO-5 (DO-203AB) hexagonal stud package.

Feature Summary

• Hermetically sealed welded metal and glass construction for durability
• Internal solder bond design ensuring robust electrical connections
• Standard polarity configuration with anode connected to the case
• Inherently radiation hard characteristics suitable for harsh environments

Applications

• High power voltage regulation circuits
• Overvoltage protection systems
• Reference voltage generation in industrial equipment

Procurement Notes

Verify the specific part number suffix against official documentation, as ordering suffixes such as R indicate reversed polarity while B indicates tolerance levels. Confirm that the required screening level matches your application needs, as military qualifications like JAN or JANTX are available by adding specific prefixes to the base part number. Ensure proper mounting hardware is sourced separately if insulators or bushings are required for installation.

Selection Notes

Select this component when applications require high power dissipation capabilities up to 50 watts with adequate heat sinking. The DO-5 package allows for direct mounting to chassis or heatsinks via the hexagonal stud. Consider the thermal resistance and derating curves for operation above 75°C case temperature. Verify that the standard +/- 5% voltage tolerance meets the circuit requirements without additional trimming.

Part Context

This component belongs to the Microsemi Scottsdale Division 1N3305 through 1N3350B series of 50 Watt Zener diodes. These devices are designed for broad voltage regulation ranges from 3.9 V to 200 V. The series is also available in military qualifications per MIL-PRF-19500/358, offering options for higher reliability screening in defense and aerospace applications.

Replacement Considerations

Equivalent parts include other 50 W Zener diodes in the DO-5 package with matching 36 V specifications. Cross-referencing should verify identical thermal resistance, pinout polarity, and voltage tolerance. Military equivalents may require JAN or JANTX prefixes depending on screening requirements.