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MJE18204 Datasheet(PDF) 10 Page - Motorola, Inc |
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MJE18204 Datasheet(HTML) 10 Page - Motorola, Inc |
10 / 12 page MJE18204 MJF18204 10 Motorola Bipolar Power Transistor Device Data MOUNTED FULLY ISOLATED PACKAGE LEADS HEATSINK 0.110 ″ MIN Figure 24. Screw or Clip Mounting Position for Isolation Test Number 1 * Measurement made between leads and heatsink with all leads shorted together CLIP MOUNTED FULLY ISOLATED PACKAGE LEADS HEATSINK CLIP 0.107 ″ MIN MOUNTED FULLY ISOLATED PACKAGE LEADS HEATSINK 0.107 ″ MIN Figure 25. Clip Mounting Position for Isolation Test Number 2 Figure 26. Screw Mounting Position for Isolation Test Number 3 TEST CONDITIONS FOR ISOLATION TESTS* 4–40 SCREW PLAIN WASHER HEATSINK COMPRESSION WASHER NUT CLIP HEATSINK Laboratory tests on a limited number of samples indicate, when using the screw and compression washer mounting technique, a screw torque of 6 to 8 in . lbs is sufficient to provide maximum power dissipation capability. The compression washer helps to maintain a constant pressure on the package over time and during large temperature excursions. Destructive laboratory tests show that using a hex head 4–40 screw, without washers, and applying a torque in excess of 20 in . lbs will cause the plastic to crack around the mounting hole, resulting in a loss of isolation capability. Additional tests on slotted 4–40 screws indicate that the screw slot fails between 15 to 20 in . lbs without adversely affecting the pack- age. However, in order to positively ensure the package integrity of the fully isolated device, Motorola does not recommend exceeding 10 in . lbs of mounting torque under any mounting conditions. Figure 27. Typical Mounting Techniques for Isolated Package Figure 27a. Screw–Mounted Figure 27b. Clip–Mounted MOUNTING INFORMATION** ** For more information about mounting power semiconductors see Application Note AN1040. |
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