ELEC 6740 Electronics Manufacturing Chapter 6 Surface ...jevans/elec6740/Chapter6BW.pdfELEC 6740...
Transcript of ELEC 6740 Electronics Manufacturing Chapter 6 Surface ...jevans/elec6740/Chapter6BW.pdfELEC 6740...
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ELEC 6740 Electronics Manufacturing
Chapter 6 Surface Mount Land Pattern Design
R. Wayne JohnsonAlumni Professor
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Chapter 6• Introduction• Passive Components• Land Patterns for Transistors• Land Patterns for PLCCs• Land Patterns for LCCCs• Land Patterns for SOICs• Land Patterns for SOJs• Land Patterns for DIPs (Butt Mount)• Land Patterns for Fine Pitch Gull Wing Packages• Land Patterns for BGAs• Land Patterns for Solder Paste & Solder Mask Screens
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Introduction
• Design for Manufacture (DFM)– Chapter 7
• IPC-SM-782 Land Pattern Guide• Each company defines there own design
rules often based on IPC standards and experience
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Passive (rectangular)
• Land patterns for resistors & capacitors– Pad width (A) = Wmax – K– Pad length (B)
• For resistors B = Hmax + Tmax – K• For Capacitors B = Hmax + Tmin – K
– Gap between lands (G) = Lmax - 2Tmax – K
– K = constant (typically 1 mil)
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Passive (rectangular)
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Passive (rectangular)
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Tantalum Capacitors
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Tantalum Capacitors
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MELF
D = B – (2B+A-Lmaxmax))
2
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Transistors (SOT 23)
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Transistors (SOT 89)
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Transistors (SOT 143)
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SOD 123
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SOT 223
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TO 252 DPAK
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PLCC
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PLCC
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SOIC
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SOIC
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SOP
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SOJ
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DIP (Butt Mount)
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Fine Pitch Gull Wing
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QFP
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BGA
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BGA