1N3307RA

Overview

The Microchip Technology 1N3307RA 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 8.2 V and a maximum dynamic impedance of 0.4 Ω at a test current of 1500 mA. The device operates within a junction temperature range of -65°C to +175°C and features a DO-5 (DO-203AB) hermetically sealed metal-glass package with an 11/16 inch hexagonal stud.

Feature Summary

• Hermetically sealed welded construction with internal solder bond design
• Inherently radiation hard per Microsemi MicroNote 050
• Non-sensitive to electrostatic discharge per MIL-STD-750 Method 1020
• Low thermal resistance for efficient heat dissipation

Applications

• Voltage regulation in power supplies requiring broad operating current ranges
• High-power protection circuits utilizing adequate mounting and heat sinking
• Military and aerospace applications qualifying under JAN, JANTX, or JANTXV standards

Procurement Notes

Verify the specific suffix configuration against the datasheet requirements. The 'R' suffix indicates reverse polarity where the cathode connects to the case, while standard units connect the anode to the case. Confirm tolerance requirements, as the 'A' suffix denotes ±10% voltage tolerance. Ensure the procurement specification matches the required military qualification level if applicable.

Selection Notes

Select this component for applications demanding high power dissipation up to 50 watts with low thermal resistance. Consider the physical mounting constraints of the DO-5 hexagonal stud package. Evaluate the need for reverse polarity by checking if the cathode-to-case connection is required for the circuit topology. Verify that the operating temperature range aligns with the specified -65°C to +175°C limits.

Part Context

This part belongs to the Microsemi Scottsdale Division 1N3305 through 1N3350B series of 50 Watt Zener diodes. These devices are designed for robust voltage regulation across a wide voltage selection from 3.9 V to 200 V. The series is available in various military qualifications including JAN, JANTX, and JANTXV per MIL-PRF-19500/358.

Replacement Considerations

Equivalent parts include 1N3307B for standard polarity or 1N3307RB for reverse polarity configurations.