1N3306RB

Overview

The Microchip Technology 1N3306RB is a high-power 50 W Zener diode with a nominal voltage of 7.5 V and ±5% tolerance. It features reverse polarity (cathode to case) indicated by the 'R' suffix, housed in a hermetically sealed DO-5 (DO-203AB) metal stud mount package. The device operates within a junction temperature range of -65°C to +175°C, with a maximum dynamic impedance of 0.3 Ω at a test current of 1,700 mA.

Feature Summary

• Hermetically sealed welded construction for environmental durability
• Reverse polarity configuration with cathode connected to the case
• Internal solder bond construction for mechanical stability
• Inherently radiation hard design suitable for harsh environments

Applications

• High power voltage regulation circuits
• Military and aerospace electronic systems
• Harsh environment protection applications

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm polarity and tolerance requirements. Confirm that the required military qualification level matches the available JAN, JANTX, or JANTXV variants if applicable. Ensure mounting hardware specifications align with the hexagonal stud dimensions provided in the datasheet.

Selection Notes

Select this component when a 7.5 V reference with reversed polarity is required in a high-power application. The DO-5 stud mount package facilitates direct thermal coupling to heat sinks. Verify that the system can accommodate the specific thermal resistance characteristics and that adequate heat sinking is provided to maintain operation below the 75°C case temperature limit for full 50 W dissipation.

Part Context

This part belongs to the 1N3305 through 1N3350B series of 50 Watt Zener diodes manufactured by Microsemi (now Microchip Technology). These devices are JEDEC registered and designed for broad voltage regulation needs ranging from 3.9 V to 200 V. The RB suffix specifically denotes the reverse polarity variant within this established high-power discrete semiconductor family.

Replacement Considerations

Equivalent parts include JANTX1N3306RB and other military qualified variants within the same series. Cross-reference with standard 1N3306B units only if standard anode-to-case polarity is acceptable.