IPC-SM-782A-表面贴装焊盘图形设计标准.pdf.pdf - 第50页
IPC-782-4-8 Figure 4–8 Cylindrical end cap terminations—joint illustration W = Diameter of Termination T = Termination/Plating Length A Side Overhang ▼ See Note 1 Table 9-6 End Overhang Is Not Acceptable ▼ ▼ B C F A End …
IPC-782-4-6
Figure 4–6 ‘‘J’’ lead joint description
W = Lead Width
T = Lead Thickness
▼
▼
A
▼
W
B
▼
▼
Toe
Overhang
▼
▼
C
A
▼
▼
G
▼
▼
▼
▼
F
▼
▼
E
D
▼
▼
G
See Note 1,
Table 9–4
▼
▼
Side
Overhang
T
▼
▼
End Joint Width
Side
Joint
Length
Lead
Land
▼
▼
T
▼
▼
▼
▼
IPC-782-4-7
Figure 4–7 Rectangular or square end components
W =
Width of Termination Area
•
T =
Length of Termination
•
H =
Height of Termination
•
P =
Width of Land
End
Over-
hang
Is Not
Acceptable
B
▼
▼
Three face
termination
Five face
termination
One or
Two-sided
Termination
W
Termination Configurations
▼
▼
W
▼
▼
W
▼
▼
A
Side
Over-
hang
of
Termi-
nation
▼
▼
▼
P
W
▼
P
End Joint Width
F
▼
▼
A
G
▼
▼
▼
▼
H
▼
▼
▼
▼
W
▼
▼
C
▼
▼
E
▼
▼
T
J
▼
▼
D
▼
▼
H
F
G
▼
End Overlap
▼
▼
▼
▼
▼
▼
▼
▼
▼
See Note 1
Table 9–5
Note: See ANSI/J-STD-001 for specific details on minimum acceptability requirements.
December 1999 IPC-SM-782A
41
IPC-782-4-8
Figure 4–8 Cylindrical end cap terminations—joint illustration
W = Diameter of
Termination
T = Termination/Plating
Length
A
Side
Overhang
▼
See Note 1
Table 9-6
End
Overhang Is
Not Acceptable
▼
▼
B
C
F
A
End
Joint Width
▼
▼
▼
▼
▼
E
▼
▼
T
D
▼
▼
F
Side Joint Length
and End Overlap
▼
▼
J
▼
▼
▼
▼
▼
▼
G
▼
▼
W
▼
▼
▼
IPC-782-4-9
Figure 4–9 Bottom only terminations
C
A
▼
▼
End Joint Width
▼
G
▼
▼
W = Termination Width
T = Termination Length
P = Land Width
End Overhang
Is Not Acceptable
Side
Overhang
▼
▼
W
▼
A
▼
▼
▼
Side Joint Length
G
▼
▼
D
▼
▼
▼
▼
P
T
▼
B
▼
▼
▼
▼
B
Note: See ANSI/J-STD-001 for specific details on minimum acceptability requirements.
IPC-SM-782A December 1999
42
IPC-782-4-10
Figure 4–10 Leadless chip carriers with castellated terminations—joint description
W = Castellation Width
H = Castellation Height
P = Land Length External
to Package
Side OverhangSide Overhang
H
▼
▼
▼
A
▼
▼
▼
A
End Joint Width
B
▼
▼
Side Joint Length
G
▼
D
▼
F
▼
▼
▼
▼
F
C
▼
▼
▼
▼
A
▼
▼
H
P
▼
Corner
metallization
(termination)
fillet required if
land is present
▼
W
▼
▼
▼
▼
▼
IPC-782-4-11
Figure 4–11 Butt joint description
W = Lead Width
T = Lead Thickness
Side Overhang
C
A
▼
▼
F
▼
▼
End Joint Width
▼
Toe Overhang
Is Not
Acceptable
W
▼
▼
▼
A
▼
▼
A
▼
▼
B
Side Joint Length
E
▼
▼
T
▼
▼
F
▼
▼
▼
▼
D
Land
▼
Lead
▼
G
▼
▼
▼
▼
See Note 1, Table 9–9.
Note: See ANSI/J-STD-001 for specific details on minimum acceptability requirements.
December 1999 IPC-SM-782A
43