1N3309RA

Overview

The Microchip Technology 1N3309RA 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 10.0 V at a test current of 1,200 mA. The device features a maximum dynamic impedance of 0.60 ohms and a maximum DC Zener current of 4,300 mA. It operates within a junction and storage temperature range of -65°C to +175°C. The component utilizes an industry-standard DO-5 (DO-203AB) package with a hexagonal stud.

Feature Summary

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

Applications

• High power voltage regulation circuits
• Protection against overvoltage transients
• Reference voltage generation in industrial systems

Procurement Notes

Verify the specific suffix requirements when ordering. The 'A' suffix indicates a standard tolerance of +/-10% on the Zener voltage. Confirm that the standard polarity (anode to case) aligns with your circuit design, as reverse polarity requires an 'R' suffix. Ensure adequate heat sinking is planned to maintain the case temperature below 75°C for full 50 W dissipation capability.

Selection Notes

Select this component for applications requiring robust, high-power voltage clamping or regulation. The DO-5 package allows for direct mounting to heatsinks via the hexagonal stud. Consider the thermal resistance of 2.0°C/W maximum when designing the thermal management system. Verify that the operating current remains within the specified limits to prevent exceeding the power dissipation rating.

Part Context

This part belongs to the Microsemi Scottsdale Division's line of 50 Watt Zener Diodes, which includes the 1N3305 through 1N3350B and 1N4549B through 1N4556B series. These devices are designed for broad voltage regulation needs ranging from 3.9 V to 200 V. The series is also available in military qualifications such as JAN, JANTX, and JANTXV per MIL-PRF-19500/358.

Replacement Considerations

Consult the manufacturer for surface mount equivalents if space constraints require a different form factor. Other parts within the 1N3305-1N3350B series may serve as substitutes if voltage ratings differ. Military qualified versions like JAN1N3309A offer higher screening levels but must be verified for pin compatibility.