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Product Detailed Parameters
- Description：DIODE ZENER 9.1V 50W DO5
- Series：-
- Mfr：Microchip Technology
- Package：Bulk
- Voltage - Zener (Nom) (Vz)：9.1 V
- Tolerance：±5%
- Power - Max：50 W
- Impedance (Max) (Zzt)：0.5 Ohms
- Current - Reverse Leakage @ Vr：25 µA @ 6.1 V
- Operating Temperature：-65°C ~ 175°C
- Mounting Type：Chassis, Stud Mount
- Package / Case：DO-203AB, DO-5, Stud
- Voltage - Forward (Vf) (Max) @ If：1.5 V @ 10 A
- Grade：-
- Qualification：-
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Overview
The Microchip Technology 1N3308RB 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 9.1 V at a test current of 1,370 mA. The device features a maximum dynamic impedance of 0.50 ohms and a maximum DC Zener current of 4,800 mA. It utilizes a DO-5 (DO-203AB) package with an 11/16 inch hexagonal stud. The 'R' suffix indicates reverse polarity, connecting the cathode to the case.
Feature Summary
- Hermetically sealed welded metal and glass construction for durability
- Internal solder bond design ensuring structural integrity
- Reverse polarity configuration with cathode connected to the case
- Inherently radiation hard per Microsemi MicroNote 050
Applications
- High power voltage regulation in aerospace systems
- Military electronic circuits requiring ruggedized components
- Power supplies operating under extreme thermal conditions
Procurement Notes
Verify the specific revision level and manufacturing origin when sourcing this component. Confirm that the reverse polarity designation matches the circuit requirements, as standard units feature anode-to-case polarity. Ensure proper mounting hardware is selected to maintain the specified thermal resistance and junction temperature limits during operation.
Selection Notes
Select this component for applications requiring robust voltage clamping in harsh environments. The DO-5 package allows for direct mounting to heat sinks via the hexagonal stud. Consider the positive temperature coefficient above 9.1 V when designing bias networks. Verify that the thermal management system can handle the 50 W dissipation rating at the expected case temperature.
Part Context
This part belongs to the 1N3305 through 1N3350B series of 50 Watt Zener diodes manufactured by Microsemi's Scottsdale Division. These devices are designed for high-reliability applications and are also available in JAN, JANTX, and JANTXV military qualifications. The series covers a broad voltage range from 3.9 V to 200 V.
Replacement Considerations
Equivalent parts include the 1N3308B for standard polarity or other 9.1 V 50 W Zener diodes in the DO-5 package. Verify that any substitute maintains the same reverse polarity configuration and meets the required MIL-PRF-19500/358 specifications if used in qualified systems.
