smt元器件知識(文件)
【正文】 A VISION OF GOOD ONE CHERISHES AND THE ENTHUSIASM THAT PUSHES ONE TO SEEK ITS FULFILLMENT REGARDLESS OF OBSTACLES. BY FAITH I BY FAITH。 (Lh ＞ )、未入孔、缺件等缺點影響功能 (MA)。(a,b,c,d四點平貼於 PCB）。＞(MI) 。 wire lay flat and touch the board wire used for fixing ponent shall touch the ponent body允收狀況 18 Accept ConditionLh≦ mmWh ≦ mmX≦ Y≦ Z≦ Z Lh,Wh≦。 (Lh＞ )、未入孔、缺件等缺點影響功能(MA)。以 PCB零件面與零件基座之最低點為量測依據(jù)。(L≦ )： Coil零件腳最長長度 (Lmax)低於 3mm(L≦ 3mm) X’TAL/ 電容腳距(含 )以下之零件，腳最長長度 (Lmax)低於2mm(L≦ 2mm) lead protrusion lead be identified on solder side of trimed protrusion lead Minimum length is the protrusion lead profile be identified≦ (for general ponents) spwc of ponents:Coil Lmax≦ 3mmX’tal Lmax≦ 2mm(the clearance between two lead is less width)拒收狀況 16 Reject ConditionLmin :零件腳未出錫面Lmax ~LminLmax :L＞ mm(特殊零件依特殊零件規(guī)定 )L錫面 (MI)。 L 計算方式 : 需從 PCB沾錫面為衡量基準，可目視零件腳出錫面為基準。 ponent are mounted with correct oriental at right location and polarized symbol are identified cleatly拒收狀況 15 Reject Condition 1000μ F + + ++ J233 ● 裝極性錯誤 (MA)。 is not as specified (Wrong parts) not mounted in correct holes ponent mounted backwards (Wrong oriented) ponent not oriented correctly are missing(missing parts) is rejected. 理想狀況 Target Condition 1000μ F ++10μ16 +● 332J 文字標示辨識由上至下。 (MA)。（由左至右，或由上至下） are centered between their lands markings are visible ponents need to be oriented so that marking all read the same way (Lefttoright or topto bottom)允收狀況 14 Accept Condition R1 + C1 Q1 R2D2裝正確。(D,L≦10mil) diameter of solder ball / solder dross which can remove or not shall small than 10 mil拒收狀況 13 Reject Condition 可被剝除者 D 10mil 不易被剝除者 L 10mil、錫渣不論可被剝除者 或不易被剝除者 ,直徑 D或長度L10mil。端 (MI)。端電極頂部的上方?！?(h＜ 1/4T)外端向外延伸到焊墊端的距離為晶片高度的 25%以下 (MI)?！?(h＜ 1/4T)外端向外延伸到焊墊端的距離為晶片高度的 25%以下 (MI)。於所有可 焊接面。 flow up to top of lead angle and not touch the body(profile)of lead angle can be visible clearly拒收狀況 9Reject Condition件本體 (MI)。見。 is rejected . concave fillet is less 3 face of solder flowup on the lead angle(h) under 1/2 angle height(T) is rejected理想狀況 Target Condition ABDC伸到引線上彎曲處底部 (B)與下彎曲處頂
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