|Description||SWITCHMODE™ NPN Silicon Planar Power Transistor|
|MJE18009 Datasheet PDF : 12 Pages |
TEST CONDITIONS FOR ISOLATION TESTS*
CLIP FULLY ISOLATED
Figure 22. Clip Mounting Position for
Isolation Test Number 1
Figure 23. Clip Mounting Position Figure 24. Screw Mounting Position
for Isolation Test Number 2
for Isolation Test Number 3
*Measurement made between leads and heatsink with all leads shorted together
Figure 25a. Screw–Mounted
Figure 25b. Clip–Mounted
Figure 25. Typical Mounting Techniques
for Isolated Package
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 compres-
sion 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 package. However, in order to positively ensure the package integrity of the fully isolated device, ON Semi-
conductor does not recommend exceeding 10 in . lbs of mounting torque under any mounting conditions.
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