IPC-SM-782A 表面安装设计和焊盘设计标准(带BGA).pdf - 第127页

5.0 LAND PATTERN DIMENSIONS Figure 3 provides the land pattern dimensions for SOPIC components. These numbers represent industry consensus on the best dimensions based on empirical knowledge of fab- ricated land patterns…

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4.0 COMPONENT DIMENSIONS
Figure 2 provides the component dimensions for SOPIC components.
Component
Identifier
(mm) Type
L (mm) S (mm) W (mm) T (mm) A (mm)
B
(mm)
H
(mm)
P
(mm)
min max min max min max min max min max max max basic
SOP 6 I 5.72 6.99 3.72 5.11 0.35 0.51 0.60 1.00 3.92 4.72 6.35 1.5 1.27
SOP 8 I 5.72 6.99 3.72 5.11 0.35 0.51 0.60 1.00 3.92 4.72 6.35 1.5 1.27
SOP 10 I 5.72 6.99 3.72 5.11 0.35 0.51 0.60 1.00 3.92 4.72 8.89 1.5 1.27
SOP 12 I 5.72 6.99 3.72 5.11 0.35 0.51 0.60 1.00 3.92 4.72 8.89 1.5 1.27
SOP 14 I 5.72 6.99 3.72 5.11 0.35 0.51 0.60 1.00 3.92 4.72 11.43 1.5 1.27
SOP 16 II 7.62 8.89 5.62 7.01 0.35 0.51 0.60 1.00 5.02 6.22 11.43 2.0 1.27
SOP 18 II 7.62 8.89 5.62 7.01 0.35 0.51 0.60 1.00 5.02 6.22 13.97 2.0 1.27
SOP 20 II 7.62 8.89 5.62 7.01 0.35 0.51 0.60 1.00 5.02 6.22 13.97 2.0 1.27
SOP 22 III 9.53 10.80 7.53 8.92 0.35 0.51 0.60 1.00 6.33 8.13 16.51 2.5 1.27
SOP 24 III 9.53 10.80 7.53 8.92 0.35 0.51 0.60 1.00 6.33 8.13 16.51 2.5 1.27
SOP 28 IV 11.43 12.70 9.43 10.82 0.35 0.51 0.60 1.00 8.23 10.03 19.05 3.0 1.27
SOP 30 IV 11.43 12.70 9.43 10.82 0.35 0.51 0.60 1.00 8.23 10.03 21.59 3.0 1.27
SOP 32 V 13.34 14.61 11.34 12.73 0.35 0.51 0.60 1.00 10.14 11.94 21.59 3.5 1.27
SOP 36 V 13.34 14.61 11.34 12.73 0.36 0.51 0.60 1.00 10.14 11.94 24.13 3.5 1.27
SOP 40 VI 15.24 16.51 13.24 14.63 0.35 0.51 0.60 1.00 12.04 13.84 27.94 4.0 1.27
SOP 42 VI 15.24 16.51 13.24 14.63 0.35 0.51 0.60 1.00 12.04 13.84 27.94 4.0 1.27
Figure 2 SOPIC component dimensions
▼
▼
▼
▼
▼
▼
B
PW
A
▼
▼
H
▼
▼
SL
▼
▼
▼
▼
▼
T
IPC-782-9-3-2
IPC-SM-782
Subject
SOP
Date
5/96
Section
9.3
Revision
A
Page2of4
电子技术应用　　　　　ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ
5.0 LAND PATTERN DIMENSIONS
Figure 3 provides the land pattern dimensions for SOPIC
components. These numbers represent industry consensus
on the best dimensions based on empirical knowledge of fab-
ricated land patterns.
In the table, the dimensions shown are at maximum material
condition (MMC). The least material condition (LMC) should
not exceed the fabrication (F) allowance shown on page 4.
The LMC and the MMC provide the limits for each dimension.
The dotted line in Figure 3 shows the grid placement court-
yard which is the area required to place land patterns and
their respective components in adjacent proximity without
interference or shorting. Numbers in the table represent the
number of grid elements (each element is 0.5 by 0.5 mm) in
accordance with the international grid detailed in IEC publica-
tion 97.
RLP No.
Component
Identifier Z (mm) G (mm) X (mm)
Y (mm) C (mm) D (mm) E (mm)
Placement Grid
(No. Grid
Elements)ref ref ref basic
360A SOP 6 7.40 3.00 0.60 2.20 5.20 2.54 1.27 16x14
361A SOP 8 7.40 3.00 0.60 2.20 5.20 3.81 1.27 16x14
362A SOP 10 7.40 3.00 0.60 2.20 5.20 5.08 1.27 16x18
363A SOP 12 7.40 3.00 0.60 2.20 5.20 6.35 1.27 16x18
364A SOP 14 7.40 3.00 0.60 2.20 5.20 7.62 1.27 16x24
365A SOP 16 9.40 5.00 0.60 2.20 7.20 8.89 1.27 20x24
366A SOP 18 9.40 5.00 0.60 2.20 7.20 10.16 1.27 20x28
367A SOP 20 9.40 5.00 0.60 2.20 7.20 11.43 1.27 20x28
368A SOP 22 11.20 6.80 0.60 2.20 9.00 13.97 1.27 24x34
369A SOP 24 11.20 6.80 0.60 2.20 9.00 13.97 1.27 24x34
370A SOP 28 13.20 8.80 0.60 2.20 11.00 16.51 1.27 28x40
371A SOP 30 13.20 8.80 0.60 2.20 11.00 17.78 1.27 28x44
372A SOP 32 15.00 10.60 0.60 2.20 12.80 19.05 1.27 32x44
373A SOP 36 15.00 10.60 0.60 2.20 12.80 21.59 1.27 32x50
374A SOP 40 17.00 12.60 0.60 2.20 14.80 24.13 1.27 36x56
375A SOP 42 17.00 12.60 0.60 2.20 14.80 25.40 1.27 36x56
Figure 3 SOPIC land pattern dimensions
▼
▼
D
X
▼
▼
E
▼
▼
GC Z
Y
▼
▼
▼
▼
▼
▼
▼
▼
▼
Grid
placement
courtyard
IPC-782-9-3-3
IPC-SM-782
Subject
SOP
Date
5/96
Section
9.3
Revision
A
Page3of4
电子技术应用　　　　　ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ
6.0 TOLERANCE AND SOLDER JOINT ANALYSIS
Figure 4 provides an analysis of tolerance assumptions and
resultant solder joints based on the land pattern dimensions
shown in Figure 3. Tolerances for the component dimensions,
the land pattern dimensions (fabrication tolerances on the
interconnecting substrate), and the component placement
equipment accuracy are all taken into consideration.
Figure 4 provides the solder joint minimums for toe, heel, and
side fillets, as discussed in Section 3.3. The tolerances are
addressed in a statistical mode, and assume even distribution
of the tolerances for component, fabrication, and placement
accuracy.
Individual tolerances for fabrication (‘‘F’’) and component
placement equipment accuracy (‘‘P’’) are assumed to be as
given in the table. These numbers may be modified based on
user equipment capability or fabrication criteria. Component
tolerance ranges (C
L
,C
S
, and C
W
) are derived by subtracting
minimum from maximum dimensions given in Figure 2. The
user may also modify these numbers, based on experience
with their suppliers. Modification of tolerances may result in
alternate land patterns (patterns with dimensions other than
the IPC registered land pattern dimensions).
The dimensions for minimum solder fillets at the toe, heel, or
side (J
T
,J
H
,J
S
) have been determined based on industry
empirical knowledge and reliability testing. Solder joint
strength is greatly determined by solder volume. An observ-
able solder fillet is necessary for evidence of proper wetting.
Thus, the values in the table usually provide for a positive sol-
der fillet. Nevertheless, the user may increase or decrease the
minimum value based on process capability.
RLP No.
Tolerance
Assumptions (mm)
Solder Joint
Toe (mm) Heel (mm) Side (mm)
FPC
L
J
T
min J
T
max C
S
J
H
min J
H
max C
W
J
S
min J
S
max
360A 0.10 0.10 1.27 0.20 0.84 1.26 0.36 1.06 0.16 0.02 0.13
361A 0.10 0.10 1.27 0.20 0.84 1.26 0.36 1.06 0.16 0.02 0.13
362A 0.10 0.10 1.27 0.20 0.84 1.26 0.36 1.06 0.16 0.02 0.13
363A 0.10 0.10 1.27 0.20 0.84 1.26 0.36 1.06 0.16 0.02 0.13
364A 0.10 0.10 1.27 0.20 0.84 1.26 0.36 1.06 0.16 0.02 0.13
365A 0.10 0.10 1.27 0.25 0.89 1.26 0.31 1.01 0.16 0.02 0.13
366A 0.10 0.10 1.27 0.25 0.89 1.26 0.31 1.01 0.16 0.02 0.13
367A 0.10 0.10 1.27 0.25 0.89 1.26 0.31 1.01 0.16 0.02 0.13
368A 0.10 0.10 1.27 0.20 0.84 1.26 0.36 1.06 0.16 0.02 0.13
369A 0.10 0.10 1.27 0.20 0.84 1.26 0.36 1.06 0.16 0.02 0.13
370A 0.10 0.10 1.27 0.25 0.89 1.26 0.31 1.01 0.16 0.02 0.13
371A 0.10 0.10 1.27 0.25 0.89 1.26 0.31 1.01 0.16 0.02 0.13
372A 0.10 0.10 1.27 0.19 0.83 1.26 0.37 1.07 0.16 0.02 0.13
373A 0.10 0.10 1.27 0.19 0.83 1.26 0.37 1.07 0.16 0.02 0.13
374A 0.10 0.10 1.27 0.24 0.88 1.26 0.32 1.02 0.16 0.02 0.13
375A 0.10 0.10 1.27 0.24 0.88 1.26 0.32 1.02 0.16 0.02 0.13
Figure 4 Tolerance and solder joint analysis
Zmax
Lmin
▼
▼
▼
▼
1
/2 T
T
J
T
min
Smax
J
H
min
1
/2 T
H
Xmax
▼
▼
Toe Fillet
▼
▼
▼
Heel Fillet
Side Fillet
▼
▼
▼
▼
▼
J
T
max
J
H
max
J
S
min
▼
▼
▼
▼
▼
▼
▼
▼
▼
▼
▼
▼
▼
▼
▼
Gmin
▼
1
/2 T
S
J
S
max
▼
▼
▼
Wmin
▼
IPC-782-9-3-4
IPC-SM-782
Subject
SOP
Date
5/96
Section
9.3
Revision
A
Page4of4
电子技术应用　　　　　ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ