1N3331A

Single Zener Diodes Overview

The Microchip Technology 1N3331A is a high-power 50 W Zener diode belonging to the JEDEC registered 1N3305 through 1N3350B series. It provides voltage regulation with a nominal Zener voltage of 20 V at a test current of 630 mA. The device features a maximum dynamic impedance of 2.4 ohms and a reverse leakage 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) hermetically sealed metal and glass case.

Single Zener Diodes Feature Summary

• Hermetically sealed welded construction for environmental protection
• Internal solder bond construction for reliability
• Inherently radiation hard design
• Non-sensitive to electrostatic discharge

Single Zener Diodes Applications

• High power voltage regulation
• Overvoltage protection circuits
• Reference voltage generation in harsh environments

Single Zener Diodes Procurement Notes

Verify the specific tolerance suffix required for your application, as standard availability includes A (10%) and B (5%) variants. Confirm polarity requirements, noting that standard units have an anode-to-case connection while reversed polarity requires an R suffix. Ensure adequate heat sinking is planned, as the 50 W rating depends on maintaining the case temperature below 75°C.

Single Zener Diodes Selection Notes

Select this component when high power dissipation capability is necessary alongside strict environmental sealing. The DO-5 package allows for direct mounting to chassis or heatsinks via the hexagonal stud. Consider the thermal resistance characteristics and derating curves if operating above 75°C case temperature. Verify compatibility with existing PCB or panel mounting hardware due to the specific mechanical dimensions.

Single Zener Diodes Part Context

This part is manufactured by Microchip Technology's Scottsdale Division, formerly Microsemi. It falls under the category of discrete semiconductor devices, specifically high-power Zener diodes designed for rugged applications. The product line supports military qualifications including JAN, JANTX, and JANTXV levels.

Single Zener Diodes Replacement Considerations

Equivalent parts include other 20 V 50 W Zener diodes in the DO-5 package from manufacturers such as Littelfuse or Vishay. Ensure the replacement matches the hermetic seal requirement and thermal resistance specifications. Verify that the substitute device meets the same MIL-PRF-19500/358 standards if military qualification is required.