MF122 MOTOROLA [Motorola, Inc], MF122 Datasheet - Page 6

• Manufacturer Part Number: MF122
• Description: COMPLEMENTARY SILICON POWER DARLINGTONS
• Manufacturer: MOTOROLA [Motorola, Inc]

MJF122 MJF127
** For more information about mounting power semiconductors see Application Note AN1040.
6
Figure 14. Clip Mounting Position
torque of 6 to 8 in . lbs is sufficient to provide maximum power dissipation capability. The compression washer helps to maintain a con-
stant pressure on the package over time and during large temperature excursions.
cause the plastic to crack around the mounting hole, resulting in a loss of isolation capability.
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.
* Measurement made between leads and heatsink with all leads shorted together
for Isolation Test Number 1
Laboratory tests on a limited number of samples indicate, when using the screw and compression washer mounting technique, a screw
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
Additional tests on slotted 4–40 screws indicate that the screw slot fails between 15 to 20 in . lbs without adversely affecting the pack-
CLIP
BASE
FULLY ISOLATED
MOUNTED
PACKAGE
MJF122
NPN
HEATSINK
8 k
0.110” MIN
LEADS
PLAIN WASHER
NUT
4–40 SCREW
HEATSINK
COMPRESSION WASHER
TEST CONDITIONS FOR ISOLATION TESTS*
120
COLLECTOR
EMITTER
Figure 17. Typical Mounting Techniques*
Figure 15. Clip Mounting Position
Figure 13. Darlington Schematic
MOUNTING INFORMATION
for Isolation Test Number 2
CLIP
FULLY ISOLATED
MOUNTED
PACKAGE
LEADS
HEATSINK
0.107” MIN
Motorola Bipolar Power Transistor Device Data
BASE
Figure 16. Screw Mounting Position
for Isolation Test Number 3
MJF127
PNP
8 k
FULLY ISOLATED
MOUNTED
PACKAGE
120
COLLECTOR
HEATSINK
EMITTER
CLIP
HEATSINK
LEADS
0.107” MIN