QFN钢网设计

元件类型PAD图示PAD尺寸（mm）PAD修改图示特殊1L1*W1：0.66*0.203L2*W2:1.549*0.381S1:0.297S2:0.214L*W:0.61*0.197S:0.203L*W:0.711*0.197S:0.203产品：主板零件类型：QFP、QFN0.4PitchQFNS1S2L1W1W2L248Pin76Pin架0.45pitchQFNL*W:0.635*0.229S:0.2210.5PitchQFNL1*W1：0.61*0.279L2*W2：1.60*1.88S:0.2210.5PitchQFN16PinL*W:1.118*0.279S:0.221L1W1L2SW2LWSLWS16Pin8Pin28Pin0.5PitchQFNL*W:0.61*0.279S:0.221LW16Pin24Pin52Pin0.5PitchQFNL*W:0.61*0.279S:0.2210.5Pitch平底PLCCL*W:0.61*0.279S:0.22172Pin56Pin42Pin0.40PitchQFP128pinL*W:1.499*0.229S:0.17148pinL*W:1.499*0.279S：0.221128pinL*W:2.007*0.279S:0.2210.5PitchQFP钢网开孔尺寸（mm）备注L1:1:1W1：0.20L2:中间架桥0.214W2：0.25S2:1:1该元件只有底部有焊盘L*W:0.75*0.18接地多余部分平齐切开⊙1.0mm架桥1.0mmL:1:1外移0.1mmW:0.18mm接地PAD依70%开刻.产品：主板零件类型：QFP、QFNL:外加0.1W:0.20L1:外加0.1W1:0.23中间接地:按70%开圆形L:内切0.05外延0.1W:0.23按70%直接开圆按70%直接开圆L*W:0.75*0.23mm长度外加0.14接地焊盘：接地多余部分平齐切，开0.8mm的圆，间隙0.3mm,平均排列，圆的大小可视焊盘而定。（地以阻焊层修改。）中间接地按70%开两排直径0.9mm的圆，间隙为0.55mm。L*W:0.75*0.23mm长度外加0.14L:长度外加0.14mmW:0.23mm接地是按70%开L:1:1W:0.18mmL:外切0.15mmW:0.22mm