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熱門關鍵詞： 恒溫恒濕存儲櫃控溫櫃|控濕櫃電子防潮櫃恒溫恒濕試驗箱戶外投影機櫃

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電子元器件防潮措施

時間：2023-07-13 作者：點擊：

濕度敏感的元器件受潮後，在高溫熱處理的時候，比如回流焊或者波峰焊接等，會因爲內部氣體膨脹而將器件封膠或封裝材料撐裂，源于封裝材料炸開後場景類似爆米花出爐而被戲稱爲“爆米花現象”。

温度压力关系图

“爆米花现象”多出现在塑封的BGA芯片以及PBGA芯片上，在回流焊过程中峰值温度会达到220℃；而稍微大体积或复杂点的产品可能需要250-260摄氏度，在这个温度环境下水蒸气压力将达到35188mm，此时的水蒸汽压力已经大大超越元件封胶结构所能承受的极限压力。

SMD元件潮湿敏感等级区分

根據SMD元件潮濕敏感等級區分，一級需保持在≤30℃濕度≤90%RH；二級以上需保持在≤30℃濕度≤60%RH。

鼓風式烘箱

在元器件使用前采用鼓風式烘箱在120℃±3℃環境下烘烤12-48小時，可以有效解決元器件輕度受潮現象；但這僅僅只是作爲一種防範“爆米花”現象的補救手段，要從根源上規避“爆米花”現象還需要從元器件存儲環境上做功課，將元器件存放在一款性能優良的防靜電防潮櫃內才是最佳選擇。

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