pcb设计教程_设计规范_其他

<html xmlns="http://www.w3.org/1999/xhtml"><head><meta charset="utf-8"><meta name="generator" content="pdf2htmlEX"><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><link rel="stylesheet" href="https://csdnimg.cn/release/download_crawler_static/css/base.min.css"><link rel="stylesheet" href="https://csdnimg.cn/release/download_crawler_static/css/fancy.min.css"><link rel="stylesheet" href="https://csdnimg.cn/release/download_crawler_static/8085011/raw.css"><script src="https://csdnimg.cn/release/download_crawler_static/js/compatibility.min.js"></script><script src="https://csdnimg.cn/release/download_crawler_static/js/pdf2htmlEX.min.js"></script><script>try{pdf2htmlEX.defaultViewer = new pdf2htmlEX.Viewer({});}catch(e){}</script><title></title></head><body><div id="sidebar" style="display: none"><div id="outline"></div></div><div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://csdnimg.cn/release/download_crawler_static/8085011/bg1.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0">PCB 元件设计规范 </div><div class="t m0 x2 h2 y2 ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x3 h2 y3 ff1 fs0 fc0 sc0 ls0 ws0">1．目的：规范 PCB 元件封装的工艺设计及元件设计的相关参数，使得 PCB 元件封装设</div><div class="t m0 x4 h2 y4 ff2 fs0 fc0 sc0 ls0 ws0">计能够满足产品的可制造性。 </div><div class="t m0 x3 h2 y5 ff1 fs0 fc0 sc0 ls0 ws0">2．引用/参考标准或资料 </div><div class="t m0 x3 h2 y6 ff1 fs0 fc0 sc0 ls2 ws0"> IPC-SM-782A（元件封装设计标准） </div><div class="t m0 x4 h2 y7 ff1 fs0 fc0 sc0 ls0 ws0">SMT 工艺与可制造性设计（清华大学基础工业训练中心） </div><div class="t m0 x4 h2 y8 ff1 fs0 fc0 sc0 ls0 ws0">ACT-OP-RD-003 PCBA 设计管理规范（非电源类） </div><div class="t m0 x4 h2 y9 ff2 fs0 fc0 sc0 ls0 ws0">贴装元器件的焊盘设计 </div><div class="t m0 x4 h2 ya ff2 fs0 fc0 sc0 ls0 ws0">标准尺寸元器件的焊盘图形可以直接从 CAD 软件的元件库中调用，也可自行设计。</div><div class="t m0 x4 h3 yb ff2 fs0 fc0 sc0 ls0 ws0">在实际设计时，有时库中焊盘尺寸不全、元件尺寸与标准有差异或不同的工艺，还必</div><div class="t m0 x4 h3 yc ff2 fs0 fc0 sc0 ls0 ws0">须根据具体产品的组装密度、不同的工艺、不同的设备以及特殊元器件的要求进行设</div><div class="t m0 x4 h2 yd ff2 fs0 fc0 sc0 ls0 ws0">计。 </div><div class="t m0 x3 h2 ye ff2 fs0 fc0 sc0 ls0 ws0">一、 矩形片式元器件焊盘设计 </div><div class="t m0 x3 h2 yf ff1 fs0 fc0 sc0 ls0 ws0">1．Chip 元件焊盘设计应掌握以下关键 </div><div class="t m0 x3 h2 y10 ff2 fs0 fc0 sc0 ls0 ws0">（1）对稳性----两端焊盘必须对称，才能保 </div><div class="t m0 x3 h2 y11 ff1 fs0 fc0 sc0 ls0 ws0"> 证熔融焊锡表面张力平衡。 </div><div class="t m0 x3 h2 y12 ff2 fs0 fc0 sc0 ls0 ws0">（2）焊盘间距----确保元件端头或引脚与焊</div><div class="t m0 x4 h2 y13 ff2 fs0 fc0 sc0 ls0 ws0">盘恰当的搭接尺寸。 </div><div class="t m0 x3 h2 y14 ff2 fs0 fc0 sc0 ls0 ws0">（3）焊盘剩余尺寸----搭接后的剩余尺寸必</div><div class="t m0 x4 h2 y15 ff2 fs0 fc0 sc0 ls0 ws0">须保证焊点能够形成弯月面。 </div><div class="t m0 x3 h2 y16 ff2 fs0 fc0 sc0 ls0 ws0">（4）焊盘宽度----应与元件端头或引脚的宽</div><div class="t m0 x4 h2 y17 ff2 fs0 fc0 sc0 ls0 ws0">度基本一致。 </div><div class="t m0 x5 h4 y18 ff1 fs1 fc0 sc0 ls0 ws0"> </div><div class="t m0 x6 h4 ye ff1 fs1 fc0 sc0 ls0 ws0"> </div><div class="t m0 x7 h4 y19 ff1 fs1 fc0 sc0 ls0 ws0"> </div><div class="t m0 x6 h4 y1a ff1 fs1 fc0 sc0 ls0 ws0"> </div><div class="t m0 x3 h5 y1b ff1 fs2 fc0 sc0 ls0 ws0"> </div></div><div class="pi" data-data='{"ctm":[1.611161,0.000000,0.000000,1.611161,0.000000,0.000000]}'></div></div></body></html>

<div id="pf2" class="pf w0 h0" data-page-no="2"><div class="pc pc2 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://csdnimg.cn/release/download_crawler_static/8085011/bg2.jpg"><div class="t m0 x3 h2 y1 ff1 fs0 fc0 sc0 ls4 ws0">2.矩形片式元器件焊盘设 </div><div class="t m0 x3 h2 y1c ff1 fs0 fc0 sc0 ls0 ws0">(1)0805 1206 矩形片式元器件焊盘尺 </div><div class="t m0 x4 h2 y1d ff2 fs0 fc0 sc0 ls0 ws0">寸设计原则 </div><div class="t m0 x4 h2 y1e ff1 fs0 fc0 sc0 ls7 ws0">(2)1206 0805 0603 0402 0201 焊盘设计 </div><div class="t m0 x4 h6 y1f ff2 fs0 fc0 sc0 ls0 ws0">英制 公制 A(Mil) B(Mil) G(Mil) </div><div class="t m0 x4 h2 y20 ff1 fs0 fc0 sc0 ls0 ws0">1825 4564 250 70 120 </div><div class="t m0 x4 h2 y21 ff1 fs0 fc0 sc0 ls0 ws0">1812 4532 120 70 120 </div><div class="t m0 x4 h2 y22 ff1 fs0 fc0 sc0 ls0 ws0">1210 3225 100 70 80 </div><div class="t m0 x4 h2 y23 ff1 fs0 fc0 sc0 ls0 ws0">1206 (3216) 60 70 70 </div><div class="t m0 x4 h2 y24 ff1 fs0 fc0 sc0 ls0 ws0">0805 (2012) 50 60 30 </div><div class="t m0 x4 h2 y25 ff1 fs0 fc0 sc0 ls0 ws0">0603 (1608) 25 30 25 </div><div class="t m0 x4 h2 y26 ff1 fs0 fc0 sc0 ls0 ws0">0402 (1005) 20 25 20 </div><div class="t m0 x4 h2 y27 ff1 fs0 fc0 sc0 ls0 ws0">0201 (0603) 12 10 12</div><div class="t m0 x3 h2 y28 ff2 fs0 fc0 sc0 ls0 ws0">（3）钽电容焊盘设计 </div><div class="t m0 x8 h6 y29 ff2 fs0 fc0 sc0 ls0 ws0">代码 英制 公制 A(Mil) B(Mil) G(Mil) </div><div class="t m0 x4 h2 y2a ff1 fs0 fc0 sc0 ls0 ws0">A 1206 3216 50 60 40 </div><div class="t m0 x4 h2 y2b ff1 fs0 fc0 sc0 ls0 ws0">B 1411 3528 90 60 50 </div><div class="t m0 x3 h2 y2c ff1 fs0 fc0 sc0 ls0 ws0"> C 2312 6032 90 90 120 </div><div class="t m0 x4 h2 y2d ff1 fs0 fc0 sc0 ls0 ws0">D 2817 7243 100 100 160 </div><div class="t m0 x3 h2 y2e ff1 fs0 fc0 sc0 ls0 ws0">(4)电感 </div><div class="t m0 x8 h2 y1a ff2 fs0 fc0 sc0 ls0 ws0">分类:CHIP、精密线绕、模压元件尺寸和</div><div class="t m0 x8 h2 y2f ff2 fs0 fc0 sc0 ls0 ws0">焊盘尺寸 </div><div class="t m0 x9 h2 y30 ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 xa h2 ya ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 xa h2 yb ff2 fs0 fc0 sc0 ls0 ws0">焊盘宽度：A=Wmax-K </div><div class="t m0 xa h2 yc ff2 fs0 fc0 sc0 ls0 ws0">电阻器焊盘的长度：B=Hmax+Tmax+K </div><div class="t m0 xa h2 yd ff2 fs0 fc0 sc0 ls0 ws0">电容器焊盘的长度：B=Hmax+Tmax-K </div><div class="t m0 xa h2 ye ff2 fs0 fc0 sc0 ls0 ws0">焊盘间距：G=Lmax-2Tmax-K </div><div class="t m0 xa h2 yf ff2 fs0 fc0 sc0 ls0 ws0">公式中：L---元件长度，mm； </div><div class="t m0 xa h2 y10 ff1 fs0 fc0 sc0 ls0 ws0"> W---元件宽度，mm； </div><div class="t m0 xa h2 y11 ff1 fs0 fc0 sc0 ls0 ws0"> T---元件焊端宽度，mm； </div><div class="t m0 xa h2 y12 ff1 fs0 fc0 sc0 ls0 ws0"> H---元件高度，mm； </div><div class="t m0 xa h2 y13 ff1 fs0 fc0 sc0 ls0 ws0"> （对塑封钽电容器是指焊端高度） </div><div class="t m0 xa h2 y14 ff1 fs0 fc0 sc0 ls0 ws0"> K---常数，一般取 0.25mm. </div><div class="t m0 xa h2 y15 ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 xa h2 y16 ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x3 h2 y31 ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x3 h2 y32 ff1 fs0 fc0 sc0 ls0 ws0"> </div></div><div class="pi" data-data='{"ctm":[1.611161,0.000000,0.000000,1.611161,0.000000,0.000000]}'></div></div>

<div id="pf4" class="pf w0 h0" data-page-no="4"><div class="pc pc4 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://csdnimg.cn/release/download_crawler_static/8085011/bg4.jpg"><div class="t m0 x3 h2 y1 ff2 fs0 fc0 sc0 ls0 ws0">二、半导体分立器件焊盘设计 </div><div class="t m0 xb h2 y1c ff1 fs0 fc0 sc0 ls4 ws0">1.分类 </div><div class="t m0 x4 h2 y1d ff1 fs0 fc0 sc0 ls0 ws0">MELF </div><div class="t m0 x4 h2 y1e ff2 fs0 fc0 sc0 ls0 ws0">片式：J 和 L 行引脚 </div><div class="t m0 x4 h2 y1f ff1 fs0 fc0 sc0 ls0 ws0">SOT 系列：SOT23、SOT89、SOT143 TOX 系列：TO252 </div><div class="t m0 xb h2 y20 ff1 fs0 fc0 sc0 ls4 ws0">2.MELF 设计 </div><div class="t m0 x4 h2 y21 ff2 fs0 fc0 sc0 ls0 ws0">（1） 定义：金属面电极无引线器，二极管、电阻、电容（陶瓷、钽）都采用此封装。 </div><div class="t m0 x4 h2 y22 ff2 fs0 fc0 sc0 ls0 ws0">二极管黑线表示元件负极。 </div><div class="t m0 x4 h2 y23 ff2 fs0 fc0 sc0 ls0 ws0">（2）焊盘设计 Z=L+1.3 元件的公称长度 </div><div class="c xc y35 w2 h7"><div class="t m0 xd h2 y36 ff1 fs0 fc0 sc0 ls0 ws0">RLPNO. </div></div><div class="c xe y35 w3 h7"><div class="t m0 xf h2 y36 ff1 fs0 fc0 sc0 ls0 ws0">COMPONENT </div></div><div class="c x10 y35 w4 h7"><div class="t m0 xd h2 y36 ff1 fs0 fc0 sc0 ls0 ws0">Z(mm) </div></div><div class="c x11 y35 w5 h7"><div class="t m0 xd h2 y36 ff1 fs0 fc0 sc0 ls0 ws0">G(mm) </div></div><div class="c x12 y35 w6 h7"><div class="t m0 xd h2 y36 ff1 fs0 fc0 sc0 ls0 ws0">X(mm) </div></div><div class="c x13 y35 w7 h7"><div class="t m0 xd h2 y36 ff1 fs0 fc0 sc0 ls0 ws0">Y(mm) </div></div><div class="c x14 y35 w5 h7"><div class="t m0 xd h2 y36 ff1 fs0 fc0 sc0 ls0 ws0">C(mm) </div></div><div class="c x15 y35 w8 h7"><div class="t m0 x16 h2 y36 ff1 fs0 fc0 sc0 ls0 ws0">A </div></div><div class="c x17 y35 w9 h7"><div class="t m0 x16 h2 y36 ff1 fs0 fc0 sc0 ls0 ws0">B </div></div><div class="c x18 y35 wa h7"><div class="t m0 xd h8 y37 ff1 fs3 fc0 sc0 ls0 ws0">Placement </div><div class="t m0 x19 h8 y38 ff1 fs3 fc0 sc0 ls0 ws0">Grid </div></div><div class="c xc y39 w2 h9"><div class="t m0 x1a h2 y3a ff1 fs0 fc0 sc0 ls0 ws0">200A </div></div><div class="c xe y39 w3 h9"><div class="t m0 xd h2 y3a ff1 fs0 fc0 sc0 ls0 ws0">SOD-80/MLL-34 </div></div><div class="c x10 y39 w4 h9"><div class="t m0 x16 h2 y3a ff1 fs0 fc0 sc0 ls0 ws0">4.80 </div></div><div class="c x11 y39 w5 h9"><div class="t m0 x1b h2 y3a ff1 fs0 fc0 sc0 ls0 ws0">2.00 </div></div><div class="c x12 y39 w6 h9"><div class="t m0 x1b h2 y3a ff1 fs0 fc0 sc0 ls0 ws0">1.80 </div></div><div class="c x13 y39 w7 h9"><div class="t m0 x1b h2 y3a ff1 fs0 fc0 sc0 ls0 ws0">1.40 </div></div><div class="c x14 y39 w5 h9"><div class="t m0 x16 h2 y3a ff1 fs0 fc0 sc0 ls0 ws0">3.40 </div></div><div class="c x15 y39 w8 h9"><div class="t m0 xd h2 y3a ff1 fs0 fc0 sc0 ls0 ws0">0.50 </div></div><div class="c x17 y39 w9 h9"><div class="t m0 xd h2 y3a ff1 fs0 fc0 sc0 ls0 ws0">0.50 </div></div><div class="c x18 y39 wa h9"><div class="t m0 x16 h2 y3a ff1 fs0 fc0 sc0 ls4 ws0">6x12 </div></div><div class="c xc y3b w2 ha"><div class="t m0 x1a h2 y3c ff1 fs0 fc0 sc0 ls0 ws0">201A </div></div><div class="c xe y3b w3 ha"><div class="t m0 xd h2 y3c ff1 fs0 fc0 sc0 ls0 ws0">SOD-87/MLL-41 </div></div><div class="c x10 y3b w4 ha"><div class="t m0 x16 h2 y3c ff1 fs0 fc0 sc0 ls0 ws0">6.30 </div></div><div class="c x11 y3b w5 ha"><div class="t m0 x1b h2 y3c ff1 fs0 fc0 sc0 ls0 ws0">3.40 </div></div><div class="c x12 y3b w6 ha"><div class="t m0 x1b h2 y3c ff1 fs0 fc0 sc0 ls0 ws0">2.60 </div></div><div class="c x13 y3b w7 ha"><div class="t m0 x1b h2 y3c ff1 fs0 fc0 sc0 ls0 ws0">1.45 </div></div><div class="c x14 y3b w5 ha"><div class="t m0 x16 h2 y3c ff1 fs0 fc0 sc0 ls0 ws0">4.85 </div></div><div class="c x15 y3b w8 ha"><div class="t m0 xd h2 y3c ff1 fs0 fc0 sc0 ls0 ws0">0.50 </div></div><div class="c x17 y3b w9 ha"><div class="t m0 xd h2 y3c ff1 fs0 fc0 sc0 ls0 ws0">0.50 </div></div><div class="c x18 y3b wa ha"><div class="t m0 x16 h2 y3c ff1 fs0 fc0 sc0 ls4 ws0">6x14 </div></div><div class="c xc y3d w2 ha"><div class="t m0 x1a h2 y3c ff1 fs0 fc0 sc0 ls0 ws0">202A </div></div><div class="c xe y3d w3 ha"><div class="t m0 x1c h2 y3c ff1 fs0 fc0 sc0 ls0 ws0">2012[0805] </div></div><div class="c x10 y3d w4 ha"><div class="t m0 x16 h2 y3c ff1 fs0 fc0 sc0 ls0 ws0">3.20 </div></div><div class="c x11 y3d w5 ha"><div class="t m0 x1b h2 y3c ff1 fs0 fc0 sc0 ls0 ws0">0.60 </div></div><div class="c x12 y3d w6 ha"><div class="t m0 x1b h2 y3c ff1 fs0 fc0 sc0 ls0 ws0">1.60 </div></div><div class="c x13 y3d w7 ha"><div class="t m0 x1b h2 y3c ff1 fs0 fc0 sc0 ls0 ws0">1.30 </div></div><div class="c x14 y3d w5 ha"><div class="t m0 x16 h2 y3c ff1 fs0 fc0 sc0 ls0 ws0">1.90 </div></div><div class="c x15 y3d w8 ha"><div class="t m0 xd h2 y3c ff1 fs0 fc0 sc0 ls0 ws0">0.50 </div></div><div class="c x17 y3d w9 ha"><div class="t m0 xd h2 y3c ff1 fs0 fc0 sc0 ls0 ws0">0.35 </div></div><div class="c x18 y3d wa ha"><div class="t m0 x1d h2 y3c ff1 fs0 fc0 sc0 ls4 ws0">4x8 </div></div><div class="c xc y3e w2 h7"><div class="t m0 x1a h2 y3f ff1 fs0 fc0 sc0 ls0 ws0">203A </div></div><div class="c xe y3e w3 h7"><div class="t m0 x1c h2 y3f ff1 fs0 fc0 sc0 ls0 ws0">3216[1206] </div></div><div class="c x10 y3e w4 h7"><div class="t m0 x16 h2 y3f ff1 fs0 fc0 sc0 ls0 ws0">4.40 </div></div><div class="c x11 y3e w5 h7"><div class="t m0 x1b h2 y3f ff1 fs0 fc0 sc0 ls0 ws0">1.20 </div></div><div class="c x12 y3e w6 h7"><div class="t m0 x1b h2 y3f ff1 fs0 fc0 sc0 ls0 ws0">2.00 </div></div><div class="c x13 y3e w7 h7"><div class="t m0 x1b h2 y3f ff1 fs0 fc0 sc0 ls0 ws0">1.60 </div></div><div class="c x14 y3e w5 h7"><div class="t m0 x16 h2 y3f ff1 fs0 fc0 sc0 ls0 ws0">2.80 </div></div><div class="c x15 y3e w8 h7"><div class="t m0 xd h2 y3f ff1 fs0 fc0 sc0 ls0 ws0">0.50 </div></div><div class="c x17 y3e w9 h7"><div class="t m0 xd h2 y3f ff1 fs0 fc0 sc0 ls0 ws0">0.55 </div></div><div class="c x18 y3e wa h7"><div class="t m0 x16 h2 y3f ff1 fs0 fc0 sc0 ls4 ws0">6x10 </div></div><div class="c xc y40 w2 h7"><div class="t m0 x1a h2 y41 ff1 fs0 fc0 sc0 ls4 ws0">204A </div></div><div class="c xe y40 w3 h7"><div class="t m0 x1c h2 y41 ff1 fs0 fc0 sc0 ls0 ws0">3516[1406] </div></div><div class="c x10 y40 w4 h7"><div class="t m0 x16 h2 y41 ff1 fs0 fc0 sc0 ls0 ws0">4.80 </div></div><div class="c x11 y40 w5 h7"><div class="t m0 x1b h2 y41 ff1 fs0 fc0 sc0 ls0 ws0">2.00 </div></div><div class="c x12 y40 w6 h7"><div class="t m0 x1b h2 y41 ff1 fs0 fc0 sc0 ls0 ws0">1.80 </div></div><div class="c x13 y40 w7 h7"><div class="t m0 x1b h2 y41 ff1 fs0 fc0 sc0 ls0 ws0">1.40 </div></div><div class="c x14 y40 w5 h7"><div class="t m0 x16 h2 y41 ff1 fs0 fc0 sc0 ls0 ws0">3.40 </div></div><div class="c x15 y40 w8 h7"><div class="t m0 xd h2 y41 ff1 fs0 fc0 sc0 ls0 ws0">0.50 </div></div><div class="c x17 y40 w9 h7"><div class="t m0 xd h2 y41 ff1 fs0 fc0 sc0 ls0 ws0">0.55 </div></div><div class="c x18 y40 wa h7"><div class="t m0 x16 h2 y41 ff1 fs0 fc0 sc0 ls4 ws0">6x12 </div></div><div class="c xc y42 w2 ha"><div class="t m0 x1a h2 y43 ff1 fs0 fc0 sc0 ls0 ws0">205A </div></div><div class="c xe y42 w3 ha"><div class="t m0 x1c h2 y43 ff1 fs0 fc0 sc0 ls0 ws0">5923[2309] </div></div><div class="c x10 y42 w4 ha"><div class="t m0 x16 h2 y43 ff1 fs0 fc0 sc0 ls0 ws0">7.20 </div></div><div class="c x11 y42 w5 ha"><div class="t m0 x1b h2 y43 ff1 fs0 fc0 sc0 ls0 ws0">4.20 </div></div><div class="c x12 y42 w6 ha"><div class="t m0 x1b h2 y43 ff1 fs0 fc0 sc0 ls0 ws0">2.60 </div></div><div class="c x13 y42 w7 ha"><div class="t m0 x1b h2 y43 ff1 fs0 fc0 sc0 ls0 ws0">1.50 </div></div><div class="c x14 y42 w5 ha"><div class="t m0 x16 h2 y43 ff1 fs0 fc0 sc0 ls0 ws0">5.70 </div></div><div class="c x15 y42 w8 ha"><div class="t m0 xd h2 y43 ff1 fs0 fc0 sc0 ls0 ws0">0.50 </div></div><div class="c x17 y42 w9 ha"><div class="t m0 xd h2 y43 ff1 fs0 fc0 sc0 ls0 ws0">0.65 </div></div><div class="c x18 y42 wa ha"><div class="t m0 x16 h2 y43 ff1 fs0 fc0 sc0 ls4 ws0">6x18 </div></div><div class="t m0 x3 h2 y44 ff1 fs0 fc0 sc0 ls4 ws0">3.片式元件焊设计 </div><div class="t m0 x3 h2 y45 ff1 fs0 fc0 sc0 ls0 ws0">(1)定义：小外形二极管 </div><div class="t m0 x3 h2 y46 ff1 fs0 fc0 sc0 ls0 ws0">(2)分类：GULL WIND SOD123 SOD323 </div><div class="t m0 x4 h2 y47 ff1 fs0 fc0 sc0 ls0 ws0">J-Lead DO214（AA/AB/AC）/SMB </div><div class="t m0 x1e h2 y44 ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x1e h2 y45 ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x1e h2 y46 ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x1e h2 y47 ff1 fs0 fc0 sc0 ls0 ws0"> </div></div><div class="pi" data-data='{"ctm":[1.611161,0.000000,0.000000,1.611161,0.000000,0.000000]}'></div></div>

<div id="pf5" class="pf w0 h0" data-page-no="5"><div class="pc pc5 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://csdnimg.cn/release/download_crawler_static/8085011/bg5.jpg"><div class="t m0 x3 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0">a)GULL WIND SOD123 SOD323 焊盘设计</div><div class="t m0 x8 h2 y1c ff1 fs0 fc0 sc0 ls0 ws0">Z=L+1.3 元件的公称长度 </div><div class="t m0 x8 h2 y1d ff1 fs0 fc0 sc0 ls0 ws0">SOD123 Z=5 X=0.8 Y=1.6 </div><div class="t m0 x8 h2 y1e ff1 fs0 fc0 sc0 ls0 ws0">SOD323 Z=3.95 X=0.6 Y=1.4 </div><div class="t m0 x4 h2 y1f ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x9 h2 y48 ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x3 h2 yb ff1 fs0 fc0 sc0 lsa ws0">b) J-Lead DO214（AA/AB/AC）/SMB </div><div class="t m0 x1f h2 yc ff1 fs0 fc0 sc0 ls0 ws0">Z=L+1.4 元件的公称长度 X=1.2W1 </div><div class="t m0 x4 h2 yd ff2 fs0 fc0 sc0 ls0 ws0">系列号 Z X Y </div><div class="t m0 x4 h2 ye ff1 fs0 fc0 sc0 ls0 ws0">DO214AA 6.8 2.4 2.4 </div><div class="t m0 x4 h2 yf ff1 fs0 fc0 sc0 ls0 ws0">DO214AB 9.3 3.6 2.4 </div><div class="t m0 x4 h2 y10 ff1 fs0 fc0 sc0 ls0 ws0">DO214AC 6.5 1.74 2.4 </div><div class="t m0 x3 h2 y11 ff1 fs0 fc0 sc0 ls0 ws0">4.SOT 系列设计 </div><div class="t m0 x3 h2 y12 ff2 fs0 fc0 sc0 ls0 ws0">（1）定义：小外形晶体管 </div><div class="t m0 x3 h2 y13 ff2 fs0 fc0 sc0 ls0 ws0">（2）分类：SOT23/SOT323/SOT523 </div><div class="t m0 x4 h2 y14 ff1 fs0 fc0 sc0 ls0 ws0">SOT89/SOT223 </div><div class="t m0 x4 h2 y15 ff1 fs0 fc0 sc0 ls0 ws0">SOT143/SOT25/SOT153/SOT353 </div><div class="t m0 x4 h2 y16 ff1 fs0 fc0 sc0 ls0 ws0">SOT-252 </div><div class="t m0 x3 h2 y17 ff1 fs0 fc0 sc0 ls0 ws0">(3)单个引脚焊盘长度设计原则 </div><div class="t m0 x4 h2 y18 ff2 fs0 fc0 sc0 ls0 ws0">对于小外形晶体管，应保持焊盘间中心 </div><div class="t m0 x4 h2 y49 ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x20 h2 y11 ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x9 h2 y4a ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x20 h2 y49 ff1 fs0 fc0 sc0 ls0 ws0"> </div></div><div class="pi" data-data='{"ctm":[1.611161,0.000000,0.000000,1.611161,0.000000,0.000000]}'></div></div>