1N3313RB

Overview

The Microchip Technology 1N3313RB 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 14.0 V at a test current of 890 mA and a maximum dynamic impedance of 1.20 Ohms. The device features reversed polarity, indicated by the 'R' suffix, connecting the cathode to the case. It operates within a junction temperature range of -65°C to +175°C and utilizes a hermetically sealed DO-5 (DO-203AB) package with an 11/16 inch hexagonal stud.

Feature Summary

• Hermetically sealed welded metal and glass construction for durability
• Internal solder bond design ensuring robust electrical connections
• Reversed polarity configuration with cathode connected to the case
• Inherently radiation hard characteristics suitable for harsh environments

Applications

• High power voltage regulation circuits
• Military and aerospace electronic systems
• Industrial equipment requiring stable reference voltages

Procurement Notes

Verify the specific revision status and availability directly with Microchip Technology or authorized distributors. Confirm that the reversed polarity designation matches the intended circuit topology. Ensure proper mounting hardware and thermal interface materials are selected to maintain junction temperatures within the specified limits during operation.

Selection Notes

Select this component when a 14.0 V regulated output is required in high-power applications. The reversed polarity option simplifies grounding schemes where the cathode must be tied to the chassis. Consider the thermal resistance and derating curves to ensure adequate heat sinking is implemented for reliable performance under continuous load conditions.

Part Context

This part is part of the 1N3305 through 1N3350B series of 50 Watt Zener diodes manufactured by Microsemi, now part of Microchip Technology. These devices are designed for demanding applications requiring high power dissipation and reliability. The series offers a broad range of voltage options from 3.9 V to 200 V in a standardized DO-5 package.

Replacement Considerations

Consult the manufacturer for surface mount equivalents or direct replacements. Verify compatibility with MIL-PRF-19500/358 specifications if military qualification is required.