元件吃锡效果与PCB Layout关系.ppt

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1、元件吃锡效果与PCBLayout关系1PHOTOBYQC/WONDERNOTEDBYMED/STEVENKUO進板方向GOOD1.TWOSMDTOOCLOSE2.SMT本體易產生陰影效應8JES326S.0A3PCB進板方向2PHOTOBYQC/WONDERNOTEDBYMED/STEVENKUO光學點反黑範圍太小此光學點可以不用LAYOUT8JES326S.0A3PCB光學點太小3PHOTOBYQC/WONDERNOTEDBYMED/STEVENKUO光學點為土黃色,黑色佳8JES326S.0A3PCB光學點顏色4PH

2、OTOBYQC/WONDERNOTEDBYMED/STEVENKUO陰影效應8JES326S.0A3PCB陰影效應進板方向LAYOUT請註明進板方向5PHOTOBYQC/WONDERNOTEDBYMED/STEVENKUOGOOD(BIGPAD)8JES326S.0A3PCBBIGPAD6PHOTOBYQC/WONDERNOTEDBYMED/STEVENKUO太密易造成短路沒拖錫點LAYOUT8JES326S.0A3PCBCONNECTERSHORT7PHOTOBYQC/WONDERNOTEDBYMED/STEVENKU

3、O8JES326S.0A3PCB正板零件容易被破壞或掉件熱氣會由貫穿孔往上衝PTH&PADTOOCLOSE8PHOTOBYQC/WONDERNOTEDBYMED/STEVENKUO8JES326S.0A3PCB加白點有助減少short缺點,最好加一白線加白漆防焊(文字印刷)9PHOTOBYQC/WONDERNOTEDBYMED/STEVENKUO8JES326S.0A3PCBPhonejack和SMD太近且SMTcomponent太近易短路現象發生進板方向PAD&PADTOOCLOSE10PHOTOBYQC/WONDER

4、NOTEDBYMED/STEVENKUO8JES326S.0A3PCB光學點離pad太近(BGA會打不準)光學點&PADTOOCLOSE11PHOTOBYQC/WONDERNOTEDBYMED/STEVENKUOS1024B.5A18EPCB節省工時可使用吃錫螺絲吃錫螺絲12PHOTOBYQC/WONDERNOTEDBYMED/STEVENKUOS1024B.5A18EPCB增加拖錫點避免短路發生進板方向LAYOUT請註明進板方向增加拖錫點防止短路沒有作用的拖錫點增加拖錫點避免短路發生沒有作用的拖錫點13PHOTOBYQ

5、C/WONDERNOTEDBYMED/STEVENKUOS1024B.5A18EPCBSOLDERSIDEIC容易短路IC最好LAY在正板或以45°LAYOUT較不易造成PIN腳短路否則需用昂貴治具COVERICONSOLDERSIDELAYOUTDIRECTION14PHOTOBYQC/WONDERNOTEDBYMED/STEVENKUOS1024B.5A18EPCB不要利用螺絲孔接地PAD&SCREWHOLEGROUNDING15PHOTOBYQC/WONDERNOTEDBYMED/STEVENKUOS1024B.5

6、A18EPCBVIAhole綠漆應蓋solderside避免錫珠掉在VIAHOLE造成零件問題(翹件、空焊)SOLDERMASKONSOLDERSIDEONLY16PHOTOBYQC/WONDERNOTEDBYMED/STEVENKUOS1024B.5A18EPCB以馬賽克LAYOUT方式較好(熱平衡)DUMMYPAD17PHOTOBYQC/WONDERNOTEDBYMED/STEVENKUO防焊防止PTH拉錫18PHOTOBYQC/WONDERNOTEDBYMED/STEVENKUOTOOCLOSE容易SHORTCOM

7、PONENTTOOCLOSE19PHOTOBYQC/WONDERNOTEDBYMED/STEVENKUO電容容易FAILPTH熱氣會沖上來吃錫不好銅箔太大,散熱太快SOLDERNOTENOUGH20PHOTOBYQC/WONDERNOTEDBYMED/STEVENKUO容易SHORT吃錫後外觀不良???EASYSHORT21PHOTOBYQC/WONDERNOTEDBYMED/STEVENKUO陰影效應22PHOTOBYQC/WONDERNOTEDBYMED/STEVENKUO拖錫棒避免SOCKETSHORT拖錫棒進板方

8、向LAYOUT請註明進板方向23PHOTOBYQC/WONDERNOTEDBYMED/STEVENKUO避免CONNECTORSHORT假的pad拖錫用進板方向LAYOUT請註明進板方向拖錫棒設計方向24PHOTOBYQC/WONDERNOTEDBYMED/STEVENKUO進板方向Layout沒考量進板方向,假pa