What is New in IPC-7351C.pdf - 第36页

PC B L ibr ar i es Pr e s ents : Wh at is N ew i n IPC- 7351C Old/Ne w S old e r Join t G oa l R ecom mend a t i on s 1 .0 0 pitc h 0 .3 5 T oe / He e l T oe 1 .0 0 pi tch 0 .2 5 T oe / 0 .3 5 He e l 0 .8 0 pi tch 0 .3 5…

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PCB Libraries Presents:
What is New in IPC-7351C
New Solder Joint Goal Recommendations
Proportional SMD Pad Stack
25% Pitch
30% Pitch
5% Pitch 20% Pitch
Gullwing
Lead Shape Toe Heel Side
2.54
mm Pitch (DPAK) 0.63 0.76 0.13 0.50
1.27
mm Pitch 0.30 0.35 0.06 0.25
1.00
mm Pitch 0.25 0.30 0.05 0.20
0.08
mm Pitch 0.20 0.25 0.04 0.16
0.65
mm Pitch 0.16 0.20 0.03 0.13
0.50
mm Pitch 0.13 0.15 0.02 0.10
0.40
mm Pitch 0.10 0.12 0.01 0.08
0.35
mm Pitch 0.09 0.10 0.00 0.07
Component Families
Small Outline IC (SOIC)
Small Outline Package (SOP)
Quad Flat Package (QFP)
Small Outline Transitor (SOT23)
Small Outline Transitor (SOT223)
Small Outline Transitor (SOT143)
Small Outline Diode (SOD)
Ceramic Flat Package (CFP)
Ceramic Quad flat Package (CQFP)
TO (DPAK)
Pad Length =
Nominal Lead Length + Toe + Heel
Pad Width =
Nominal Lead Width + Side
PCB Libraries Presents:
What is New in IPC-7351C
Old/New Solder Joint Goal Recommendations
1.00 pitch
0.35 Toe / Heel
Toe
1.00 pitch
0.25 Toe / 0.35 Heel
0.80 pitch
0.35 Toe / Heel
0.80 pitch
0.20 Toe / 0.30 Heel
0.65 pitch
0.35 Toe / Heel
0.65 pitch
0.16 Toe / 0.20 Heel
Heel
Toe
Heel
0.40 pitch
0.35 Toe / Heel
0.40 pitch
0.10 Toe / 0.12 Heel
0.35 pitch
0.35 Toe / Heel
0.35 mm pitch
0.09 Toe / 0.10 Heel
0.50 pitch
0.35 Toe / Heel
0.50 pitch
0.13 Toe / 0.15 Heel
Toe
Heel
PCB Libraries Presents:
What is New in IPC-7351C
Solder Joint Goals for Gull Wing
• Perfect Pad Centering
• Visible Wetting Under Lead
• Heel Larger Than Toe
• Bad Pad Centering
• Wetting Under Lead Unachievable
• Possible Short Circuit with Trace