1N3307RB

Overview

The Microchip Technology 1N3307RB 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 8.2 V at a test current of 1,500 mA and a maximum dynamic impedance of 0.40 ohms. The device features reverse polarity (cathode to case) indicated by the 'R' suffix and offers a standard tolerance of +/- 5% for the 'B' designation. 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 package.

Feature Summary

• Hermetically sealed welded construction with internal solder bond design
• Reverse polarity configuration with cathode connected to the case
• Inherently radiation hard per Microsemi MicroNote 050
• Non-sensitive to electrostatic discharge (ESD) per MIL-STD-750 Method 1020

Applications

• Voltage regulation in broad operating current and temperature ranges
• High power dissipation applications requiring adequate mounting and heat sinking
• Military and aerospace systems utilizing JAN, JANTX, or JANTXV qualifications

Procurement Notes

Verify the specific ordering suffixes to confirm the required tolerance level and polarity configuration. Ensure that the procurement documentation explicitly references the correct JEDEC registration number and any applicable military screening prefixes if environmental robustness is required. Confirm thermal management requirements align with the specified derating curves.

Selection Notes

Select this component when a 50 W power rating and an 8.2 V regulation point are necessary. The reverse polarity design is critical for applications where the case must serve as the cathode terminal. Consider the thermal resistance characteristics and ensure the mounting hardware supports the hexagonal stud interface for effective heat dissipation.

Part Context

This part belongs to the Microsemi Scottsdale Division 1N3305 through 1N3350B series of 50 Watt Zener Diodes. These devices are designed for high-power voltage regulation tasks and are available in various voltage steps ranging from 3.9 V to 200 V. The series includes options for different tolerance levels and military qualifications to suit diverse industrial and defense requirements.

Replacement Considerations

Equivalent parts include other 50 W Zener diodes with an 8.2 V nominal voltage and reverse polarity. Verify mechanical compatibility with the DO-5 package and ensure thermal performance matches the original specifications.

FAQ

What does the 'R' suffix indicate in the part number?

The 'R' suffix signifies reverse polarity, meaning the cathode is connected to the case rather than the standard anode-to-case configuration.

How is the Zener voltage tolerance determined?

The 'B' suffix indicates a standard voltage tolerance of +/- 5%. Other suffixes like 'A' denote +/- 10%, while no suffix implies +/- 20%.