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波峰焊治具厂家告诉你焊接BGA时要注意的问题及要点

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波峰焊治具厂家告诉你焊接BGA时要注意的问题及要点

发布日期:2021-03-29 00:00 来源:http://dzzyjc.com 点击:

     BGA的焊接考虑和缺陷 1.连桥 间距为0.060英寸(1.50mm)或0.050英寸(1.0mm)的细间距BGA组件在相邻的互连位置之 间不易形成连桥。除间距尺寸外,还有两个因素影响连桥问题。 

     (1)与焊盘尺寸相关的过多的焊料量 

     YOUYULIANGGEXIANGLINWEIZHIJIANRONGRONGHANLIAODEXIANGHUQINHE,DANGHANLIAOGUODUOSHI,JIUKENENGCHUXIANLIANQIAO。MEIZHONGBGADE TEXINGGEBUXIANGTONG,ZHEIQUJUEYUSUOYONGDEHEJINCHENGFEN、ZAITIHANLIAOQIUDERONGRONGWENDU、YUZAITIHANLIAOQIUXIANGGUANDEHAN PANSHEJIHEZAITIDEZHONGLIANG。LIRU,ZAIQITATIAOJIANXIANGDENGDEQINGKUANGXIA,HANGAOWENHANLIAOQIUZAITI(ZAIBANZUZHUANGQIJIANBU RONGHUA)BUYIXINGCHENGLIANQIAO。 

     (2)HANGAOTANTA 

     SHIYONGHANGAOZUOWEIHULIANCAILIAOSHI,YINSHUAHEZAILIUHANQIJIANHANGAOTANTAXIANXIANGDUILIANQIAOQIZHONGYAOZUOYONG。SUOXUDE KANGTANTATEXINGDADAYINGXIANGHANJI/FUXINGJIXITONGDEREDONGTAITEXING。YINCI,ZAIJINENGJUNYUNDIRUNSHIHANFENBIAOMIANYOU NENGJIGAOZHANHELIDEHUAXUEXITONGJIEHELIAOZHONG,SHEJIWEIHANFENTIGONGCHONGFENBIAOMIANZHANGLIDEHANJI/FUXINGJIXITONGSHIFEI CHANGZHONGYAODE。 

    2.HANJIEDIANDEDUANKAIHUOBULAO 

    BABGALIANJIEDAOBANSHANGSHI,YINGXIANGHANJIEDIANDUANKAIHUOBULAODEZHUYAOYINSUYOUYIXIAJIDIAN: (1)BANGUOFENQIAOQU 

DADUOSHUPBGASHEJIDOUYAOKAOLVCONGZHONGXINDAOZUJIANBIANYANJUBUBANQIAOQUZUIDAKEDAO0.005YINGCUN。DANGQIAOQUCHAO GUOSUOXUDEGONGCHAJI,ZEHANJIEDIANKENENGCHUXIANDUANKAI、BULAOHUOBIANXING。    (2)GONGMIANXINGGONGCHA 

   载体焊料球所需的共面性不像细间距引线那样严格。但较好的共面性能减少焊接点出 现断开或不牢。把共面性规定为最高和最低焊料球之间的距离,对PBGA来说,共面性为7.8密耳(200μm)是可以实现的。JEDEC把共面性标准定为5.9密耳(150μm)。应当指出,共面性与 板翘曲度直接有关。 

   (3)与润湿有关 

   (4)YUZAILIUHANGUOFENDEHANLIAOCHENGTUANYOUGUAN 3.RUNSHIBULIANG 

    使用焊膏把BGA焊接到母板上时,在载体焊料球与焊膏之间或焊膏与焊盘接触面之间可 能出现润湿问题。外部因素(包括BGA制造工艺、板制造工艺及后序处理、存放和暴露条件 )可能会造成不适当的润湿。润湿问题还可能由金属表面接触时内部相互作用引起,这取决 于金属亲合特性。焊剂的化学特性和活性对润湿也有直接的影响。

   4.焊料成团 

   ZAILIUHANHOU,BANSHANGSHUSONGDEHANLIAOTUANRUBUQUCHU,GONGZUOSHIKEDAOZHIDIANQIDUANLU,YEKESHIHANFENGDEBUDAOZU GOUDEHANLIAO。XINGCHENGHANLIAOTUANDEYUANYINYOUYIXIAJIZHONGQINGKUANG: 

    ·DUIYUHANFEN、JIPIANHUOZAILIUHANYUZHIMEIYOUYOUXIAODIRONGRONG,XINGCHENGWEININGJUDELISANLIZI。 

    ·HANLIAORONGRONGQIAN(YUJIAREHUOYUGANZAO)HANGAOJIAREBUYIZHI,ZAOCHENGHANJIHUOXINGJIANGJI。 

    ·YOUYUJIARETAIKUAIZAOCHENGHANGAOFEIJIAN,XINGCHENGLISANDEHANFENHUOQINRUDAOZHUHANQUWAIMIAN。 

    ·HANGAOBEISHIQIHUOQITAGAO"NENGLIANG"HUAXUEWUZHIWURAN,CONGERJIASUJIANSHE。 

    ·JIAREQIJIAN,HANCHAOXIHANFENDEHANGAOBEIYOUJIWUGONGJUCONGZHUHANQUDAIZOUSHI,ZAIHANPANZHOUWEIXINGCHENGYUNQUAN。 

    ·HANGAOHEHANJIEFANGHUZHAOZHIJIANDEXIANGHUZUOYONG。

    5.KONGXI BANSHANGBGAHANJIEHULIANDEKONGXIYINGCONGLIANGGEFANGMIANJINXINGJIANCHA:ZUJIANSHENGCHANQIJIANXINPIANZAITIHANLIAOQIUSHANGKENENG HUIXINGCHENGKONGXI;BANZUZHUANGQIJIANXINPIANZAITIHEBANDEHANJIEHULIANCHUKENENGHUIXINGCHENGKONGXI。

    YIBANLAISHUO,XINGCHENGKONGXI DEYUANYINRUXIA: ·RUNSHIWENTI ·WAIQIYINGXIANG ·HANLIAOLIANGBUSHIDANG ·HANPANHEFENGXIJIAODA ·JINSHUHUHUAWUGUODUO ·XILIBIANJIEKONGXUE ·YINGLIYINQIDEKONGXI ·SHOUSUOYANZHONG ·HANJIEDIANDEGOUXING 6.WAIBUWURAN YOUYUHUAXUETEXINGHUOYOUYUJINSHUGONGYIKENENGHUIZAOCHENGWAIBUWURAN。CONGHUAXUEFANGMIANLAIKAN,WURANYUANYOUZHIZAOB GASHIYONGDEHANJIHEJIPIAN;BANZUZHUANGSHIYONGDEHANJI;LUOBANZHIZAO。TONGGUOYOUXIAODEQINGJIECHULIKECHUQUWUWU。


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