MT6M15589
© Fuji Electric Co., Ltd. All rights reserved.
6-2
• When mounting the Small IPM to a heat sink, the following fastening order is recommended.
Uneven fastening due to excessive torque might lead to destruction or degradation of the chip.
• Standard: Metric screw JIS B 1111
• Screw length: 8mm
• Screw head shape: Pan shape (head diameter 5.5 mm)
• Material: Stainless
• Use flat washers (JIS B1258 recommended). Washer head type screws can be used as well.
• The mounting (tightening) that support the load of structure such as heat sink or printed circuit
board by Small IPM should be avoided.
• When mounting this Small IPM together with other components to the heat sink, ensure the flatness
of the components mounted on the board before mounting.
3
Mounting (tightening)
2
Shape
Fig. 6-2 The measurement point of heat sink flatness
100mm
External Heat sink
+
-
• As shown in Fig. 6-2, the heat sink flatness should be from 0μm/100mm to +100μm/100mm, and
the surface roughness (Rz) should be less than 10
μm.
• If the heat sink surface is concave, a gap occurs between the heat sink and the IPM, leading to
deterioration of cooling efficiency.
• If the flatness is +100 μm or more, the aluminum base of the IPM is deformed and cracks could
occur in the internal isolating substrates.
A
B
DETAIL A
DETAIL B
1
4
.0
±
0
.5
14x2.54 (=35.56)
1
3
.0
3.8(min.)
43.0
35.0
2
6
.0
16-0.6
8-0.6
18x1.778(=32.004)
±
0
.5
±0.5
±0.5
4.2
1.6 ±0.5
±0.5
3
.2
±
0
.5
1
4
.0
1
4
.7
2
9
.4
±
0
.5
±
0
.5
±
0
.5
1.8
1.5
3.7
±0.1
±0.5
0.
40
2
.6
±
0
.5
1
0
.6
±
0
.5
1.8±0.1
5.2(min)
2.4 ±0.5
1
.0
±
0
.1
3
.2
3
.2
±
0
.5
±0.5
±
0
.5
5
.2
±
0
.5
±
0
.5
4
x1
.2
1.0
4
.5
8
.7
±
0
.5
±
0
.5
15.6
31.2 ±0.5
±0.5
3
5
7
9
10
11
12
13
14
15
16
17
18
19
20
21
22 23 24
26
28
30
32
36
37
38
39
40
±0.1
Fig. 6-3 Recommended screw fastening procedure
Recommended:
Pre-screwing:
1
2
Final screwing:
2
1
Note: the pre-screwing torque is set to 30% of the maximum torque rating.
1
2
