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MJE18206 Datasheet, PDF (10/12 Pages) Motorola, Inc – POWER TRANSISTORS 8 AMPERES 1200 VOLTS 40 and 100 WATTS | |||
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MJE18206 MJF18206
TEST CONDITIONS FOR ISOLATION TESTS*
MOUNTED
CLIP FULLY ISOLATED
PACKAGE
LEADS
MOUNTED
CLIP
FULLY ISOLATED
PACKAGE
0.107â³ MIN
LEADS
MOUNTED
FULLY ISOLATED
PACKAGE
0.107â³ MIN
LEADS
HEATSINK
0.110â³ MIN
HEATSINK
Figure 24. Clip Mounting Position for
Isolation Test Number 1
Figure 25. Clip Mounting Position
for Isolation Test Number 2
* Measurement made between leads and heatsink with all leads shorted together
HEATSINK
Figure 26. Screw Mounting Position
for Isolation Test Number 3
MOUNTING INFORMATION**
4â40 SCREW
CLIP
PLAIN WASHER
HEATSINK
COMPRESSION WASHER
NUT
HEATSINK
Figure 27a. ScrewâMounted
Figure 27b. ClipâMounted
Figure 27. 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 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 4â40 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 4â40 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.
** For more information about mounting power semiconductors see Application Note AN1040.
10
Motorola Bipolar Power Transistor Device Data
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