1N3328RB

Single Zener Diodes Overview

The Microchip Technology 1N3328RB 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 43 V and a tolerance of ±5%. The device features a maximum dynamic impedance of 4.5 Ohms at a test current of 290 mA, with a maximum reverse leakage current of 10 µA at 32.7 V. It utilizes a DO-5 (DO-203AB) package with a hexagonal stud for mounting. The 'R' suffix indicates reversed polarity, connecting the cathode to the case.

Single Zener Diodes Feature Summary

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

Single Zener Diodes Applications

• Voltage regulation in power supplies
• High power protection circuits
• Harsh environment applications requiring radiation hardness

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. Confirm the 'B' suffix is present to ensure the required ±5% Zener voltage tolerance. Ensure the procurement documentation references the correct Microsemi/Microchip datasheet for the 1N3305–1N3350B series to validate electrical characteristics and mechanical dimensions.

Single Zener Diodes Selection Notes

Select this component when a 50 W power dissipation capability is required within a ruggedized, hermetically sealed package. The reversed polarity option is suitable for designs where the circuit ground must connect directly to the mounting surface via the cathode. Verify that the application can accommodate the thermal resistance of 2.0 °C/W maximum junction-to-hexagonal base and that adequate heat sinking is provided to maintain the case temperature below 75 °C during operation.

Single Zener Diodes Part Context

This component belongs to the 1N3305 through 1N3350B series of 50 Watt Zener diodes manufactured by Microchip Technology's Scottsdale Division. These devices are designed for broad voltage regulation ranging from 3.9 V to 200 V. The series is also available in military qualifications including JAN, JANTX, and JANTXV per MIL-PRF-19500/358, offering enhanced screening levels for demanding aerospace and defense environments.

Single Zener Diodes Replacement Considerations

The 1N3328B is a parameter-equivalent substitute with identical specifications but standard polarity (anode to case). For reversed polarity requirements, verify if other parts in the 1N33xxRB series match the specific voltage needs.