1N3305B

Overview

The Microchip Technology 1N3305B is a high-power 50 W Zener diode with a nominal voltage of 6.8 V and a tolerance of ±5%. It operates within a temperature range of -65°C to +175°C, featuring a maximum DC Zener current of 6,600 mA at a test current of 1,850 mA. The device exhibits a dynamic impedance of 0.20 Ohms and a reverse leakage current of 300 µA at 4.5 V. Packaged in a hermetically sealed DO-5 (DO-203AB) stud mount configuration, it provides robust voltage regulation for demanding applications.

Feature Summary

• Hermetically sealed welded construction with internal solder bond design
• Standard polarity connects the anode directly to the case
• Inherently radiation hard and non-sensitive to electrostatic discharge
• Capable of operating up to 50 W with adequate heat sinking

Applications

• High power voltage regulation circuits
• Military and aerospace electronic systems
• Harsh environment industrial equipment

Procurement Notes

Verify that the component matches the specific JEDEC registered part number 1N3305B. Confirm the required tolerance level corresponds to the B suffix designation. Ensure the mounting hardware aligns with the hexagonal base specifications. Check for any necessary military qualification prefixes if applicable to the project requirements.

Selection Notes

Select this component when a stable 6.8 V reference is needed under high thermal stress. The DO-5 package facilitates direct chassis mounting for efficient heat dissipation. Consider the low thermal resistance for applications requiring sustained operation near the maximum power rating without excessive junction temperature rise.

Part Context

This device belongs to the 1N3305 through 1N3350B series of 50 Watt Zener diodes manufactured by Microsemi's Scottsdale Division. The series covers a broad voltage range from 3.9 V to 200 V, providing standardized options for various power regulation needs across different industries.

Replacement Considerations

Consult the manufacturer for surface mount equivalents or alternative part numbers within the same series that offer different voltage ratings or tolerance levels.