1N3321RB

Single Zener Diodes Overview

The Microchip Technology 1N3321RB 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 24 V at a test current of 520 mA. The device features a maximum dynamic impedance of 2.6 ohms and a reverse leakage current of 10 µA at 18.2 V. It operates within a junction temperature range of -65°C to +175°C, utilizing a DO-5 (DO-203AB) package with an R suffix indicating reversed polarity where the cathode connects to the case.

Single Zener Diodes Feature Summary

• Hermetically sealed welded metal and glass construction for durability
• Internal solder bond design ensuring structural integrity
• Inherently radiation hard characteristics suitable for harsh environments
• ESD nonsensitive performance verified per MIL-STD-750 Method 1020

Single Zener Diodes Applications

• High power voltage regulation in aerospace systems
• Military electronic circuit protection
• Industrial equipment requiring robust thermal stability

Single Zener Diodes Procurement Notes

Verify that the specific part number includes the 'R' suffix to confirm reversed polarity configuration, as standard units feature anode-to-case connections. Ensure procurement specifications align with the required military qualification levels, such as JAN, JANTX, or JANTXV, which are available by adding respective prefixes to the base part number. Confirm compliance with the specified mechanical mounting requirements for the hexagonal stud interface.

Single Zener Diodes Selection Notes

Select this component when designing circuits requiring high power dissipation capabilities up to 50 watts with adequate heat sinking. The reversed polarity option facilitates specific mounting configurations where the cathode must connect directly to the chassis. Consider the thermal resistance characteristics and derating curves for operation above 75°C case temperature to ensure reliable performance under varying load conditions.

Single Zener Diodes Part Context

This device belongs to the Microsemi Scottsdale Division product line, now integrated into Microchip Technology's portfolio. The 1N3305 through 1N3350B series represents a broad range of voltages from 3.9 V to 200 V, designed for applications demanding high reliability. These components are widely utilized in sectors requiring ruggedized semiconductor solutions, including defense, space, and industrial automation markets.

Single Zener Diodes Replacement Considerations

Equivalent parts include the 1N4553B from the parallel series. Verify compatibility regarding tolerance levels and physical mounting dimensions before substitution.