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新聞 > 專(zhuān)業(yè)PCBA加工工廠_PCBA代工代料一站式服務(wù)_PCBA行業(yè)資訊 >小銘工業(yè)互聯(lián)網(wǎng)： QFN芯片的SMT鋼網(wǎng)模板孔徑考量

QFN芯片的SMT鋼網(wǎng)模板孔徑考量

來(lái)源：本站     時(shí)間：2020/03/13
QFN芯片的模板孔徑考量 
四扁平無(wú)引線（QFN）是一種扁平無(wú)引線封裝，是一種將IC連接到PCB表面的表面貼裝技術(shù)。 由于芯片尺寸接近規(guī)格，它們變得更受歡迎。 由于QFN支持小尺寸和高密度封裝以及互連規(guī)格，因此設(shè)計(jì)人員可以大幅縮小PCB板尺寸。 

扁平無(wú)引線包裝 - QFP和其他 
諸如雙扁平無(wú)引線（DFN），微引線框架（MLF）和小外形無(wú)引線（SON）之類(lèi)的扁平無(wú)引線封裝在封裝尺寸上與QFN類(lèi)似，但是這些IC具有暴露的熱墊在他們的中心區(qū)域。 在回流焊組裝期間，這些集成電路有時(shí)會(huì)漂浮在位于其散熱墊下方的熔融焊料池中，這可能會(huì)阻止其端子與PCB接觸。 

回流焊組件 - 當(dāng)電路板溫度高于焊料的熔點(diǎn)時(shí)，由于液體張力，焊膏將變平并形成圓頂狀焊料滴。 


更大量的焊膏將覆蓋更大的面積而不是更小的量。 結(jié)果，由于液體張力，較大面積的焊膏將產(chǎn)生比較小面積更高的圓頂。 


浮動(dòng)焊料將抬起IC。 這種情況可能會(huì)阻止IC的端子和PCB焊盤(pán)之間的接觸。 


深圳市銘華航電SMT貼片打樣在回流焊過(guò)程中，如果沒(méi)有任何焊膏體積控制，IC的一側(cè)可能會(huì)連接到PCB焊盤(pán)，而另一側(cè)可能由于熱焊盤(pán)中心的過(guò)量焊料而導(dǎo)致接觸不良。 為了控制熱焊盤(pán)中心的焊膏體積，必須考慮模板孔徑。 


上一篇：SMT貼片元器件的IC芯片 下一篇：PCB印刷電路板為什么要涂上阻焊劑
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