1N3318RA

$36.38

Description：DIODE ZENER 19V 50W DO5
Series：-
Mfr：Microchip Technology
Package：Bulk

SKU:a1aac9f76be7 Category: Single Zener Diodes Brand: Microchip Technology

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Product introduction

Product Detailed Parameters

Description：DIODE ZENER 19V 50W DO5
Series：-
Mfr：Microchip Technology
Package：Bulk
Voltage - Zener (Nom) (Vz)：19 V
Tolerance：±10%
Power - Max：50 W
Impedance (Max) (Zzt)：2.2 Ohms
Current - Reverse Leakage @ Vr：10 µA @ 13.7 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

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1N3318RA

Overview

The Microchip Technology 1N3318RA 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 19 V and a test current (IZT) of 660 mA. The device features a maximum dynamic impedance (ZZT) of 2.2 Ohms at IZT and 2.20 Ohms at IZK = 5 mA. Standard tolerance for the 'A' suffix is +/-10%. It operates within a junction temperature range of -65°C to +175°C, dissipating up to 50 watts at a case temperature below 75°C.

Feature Summary

Hermetically sealed welded metal and glass construction
Internal solder bond design
Reverse polarity configuration with cathode connected to the case
Radiation hard characteristics

Applications

High power voltage regulation
Industrial control systems
Military applications requiring MIL-PRF-19500/358 screening

Procurement Notes

Verify that the specific part number includes the 'R' suffix to confirm reverse polarity orientation where the cathode connects to the case. Ensure thermal management meets the requirement of maintaining the stud temperature below 75°C for full 50 W dissipation. Confirm military qualification prefixes if required by the application specification.

Selection Notes

Select this component when a 19 V regulation point is needed in a high-power environment. The DO-5 package allows for direct mounting to heat sinks via the hexagonal stud. Consider the +/-10% tolerance of the 'A' suffix against tighter requirements. Verify that the system can accommodate the reversed polarity connection scheme compared to standard anode-to-case units.

Part Context

This device belongs to the Microsemi Scottsdale Division 1N3305 through 1N3350B series of 50 Watt Zener diodes. These components are designed for robust voltage regulation across a broad voltage range. The series supports various military qualifications including JAN, JANTX, and JANTXV levels upon request.