PRINTED CIRCUIT BOARDS LAYOUT SPECIFICATION - Read
PRINTED CIRCUIT BOARDS LAYOUT SPECIFICATION - Read
PRINTED CIRCUIT BOARDS LAYOUT SPECIFICATION - Read
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MITAC <strong>SPECIFICATION</strong> SC830215321021 R07C<br />
10. 銲墊(PAD)<br />
10.1. 除 SMC PAD 外,除非有必要,否則其他 PAD 之 TOP PAD,BOTTOM PAD<br />
及 INNER PAD 之形狀大小皆應相同。<br />
10.2. PTH COMPONENT PAD:<br />
10.2.1. 鑽孔孔徑算法:<br />
鑽孔直徑=A+元件腳本身之最大值(換算成 mil 單位)<br />
A=4〜6,當元件腳越粗或腳數越多時,此值應越大。<br />
元件腳為方型形時取對角寬度;扁平元件腳亦儘量以鑽圓孔來考慮。<br />
若要鑽長方孔時,㆖述 A=6min。<br />
10.3. PAD 之形狀大小與所鑽之孔徑及形狀有關,正常情況㆘皆鑽圓孔,圓形 PAD<br />
之直徑(或方形 PAD 之邊長)與孔徑㆗值之差必須至少 16mil 以㆖。<br />
如鑽長方形孔時:<br />
C<br />
B<br />
D A<br />
D A<br />
鑽孔孔徑 D,PAD 直徑 A<br />
D