1N3335RB

Overview

The Microchip Technology 1N3335RB 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 75 V at a test current of 170 mA. The device features a maximum dynamic impedance of 9.0 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 dissipates up to 50 watts when mounted on a heat sink maintained below 75°C.

Feature Summary

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

Applications

• High power voltage regulation circuits
• Overvoltage protection systems
• Harsh environment electronic assemblies

Procurement Notes

Verify the specific part number against official Microchip documentation to confirm the reversed polarity designation indicated by the 'R' suffix. Ensure that thermal management requirements are met, as the device requires adequate mounting and heat sinking to sustain the full 50 W power dissipation rating without exceeding the maximum junction temperature limits defined in the datasheet.

Selection Notes

Select this component when a high-power Zener diode with a 75 V breakdown voltage is required. The reversed polarity variant is necessary if the circuit design mandates the cathode be electrically connected to the mounting stud. Consider the thermal resistance and derating curves to ensure reliable operation under expected load conditions and ambient temperatures.

Part Context

This component is part of the broader 1N3305 through 1N3350B series of 50 Watt Zener diodes manufactured by Microchip Technology's Scottsdale Division. The series covers a wide voltage range from 3.9 V to 200 V, offering standardized DO-5 package options for various industrial and military applications requiring robust voltage reference or regulation capabilities.

Replacement Considerations

Equivalent parts include the standard 1N3335B (standard polarity) and the 1N4551B (reverse polarity). Verify mechanical compatibility with the DO-5 package and confirm that the thermal and electrical specifications meet the original design requirements before substitution.