What is New in IPC-7351C.pdf - 第8页
PC B L ibr ar i es Pr e s ents : Wh at is N ew i n IPC- 7351C Ba ll Gri d Array Bump G rid Arr a y Land G rid Array Colum n Grid Array Pill a r G rid Array Flat Side Convex Side Conca v e S ide Corner Concave Gul l Wing …
PCB Libraries Presents:
What is New in IPC-7351C
• Most Component Manufacturer’s
Recommended Pad Shape is Rectangle
• IPC-SM-782 and IPC-7351B
Recommended Pad Shape is Oblong
• IPC-7351C – Rounded Rectangle Pad
Land Width =
Shortest Side
Maximum Radius =
10 Mil (0.25 mm)
Corner Radius =
25% Land Width
1 Mil (0.01 mm)
Round-off
Rounded Rectangle Pad Shape
PCB Libraries Presents:
What is New in IPC-7351C
Ball Grid Array Bump Grid Array Land Grid Array
Column Grid Array
Pillar Grid Array
Flat Side
Convex Side Concave Side
Corner Concave
Gull Wing
J-Lead
Flat Lug
Outward L
Inward L
End Cap Under Body L
Flat Bottom
No-Lead
Surface Mount Component Lead Styles
PCB Libraries Presents:
What is New in IPC-7351C
Under Body “L”
Gull Wing
QFN D-Shape
PQFN D-Shape Corner Concave
End Cap
Lead Styles and Rounded Rectangle Pads
Sharp Corner pads are not good for RF design