Description

<style>.e_editor{font:14px/24px Roboto,Helvetica,Tahoma,Arial,'Microsoft YaHei','b8bf53';}.e_editor div,e_editor p,e_editor td,e_editor th,e_editor li{font-weight:inherit;font-size:inherit;font-style:inherit;font-family:inherit;}.e_editor ul{margin:-10px 0 20px;}.e_editor li{padding:5px 0;}.e_table{width:96%;border-collapse:collapse;empty-cells:show;}.e_table th,.e_table td{padding:5px;border:2px solid #eee;}.e_img{padding:10px 0;text-align:center;}.e_p{line-height:20px;padding:0 0 20px;text-indent:0em;}</style><p><br/></p><p><span style="font-size:14px;">1. Layout is in accordance with the circuit module. The relevant circuit achieving the same function is a module; the components in circuit module should be used in the nearby centralized principle, while digital circuits and analog circuits will be separated;</span> </p><p><span style="font-size:14px;">2.3.5mm(For M2.5), 4mm (for M3) around the mounting hole like bolt may not be mounted on the components; 1.27mm around the non-mounting holes like position hole and standard hole should not be mounted with components and devices.</span> </p><p><span style="font-size:14px;">3. The bottom of sleeper resistance, inductance (plug-in), electrolytic capacitors and other components should avoid through-hole, preventing the short circuit between through-hole and component shell after wave soldering;</span> </p><p><span style="font-size:14px;">4. The distance between the outer side of the component and the board edge is 5 mm;</span> </p><p><span style="font-size:14px;">5. The distance between the outer edge of mounting element pad and the outside of the adjacent components is more than 2 mm;</span> </p><p><span style="font-size:14px;">6. Metal shell components and metal parts (shielding boxes, etc.) cannot be collided with other components, cannot be close to the printed line and pad, their spacing should be more than than 2mm. Positioning holes, fastener mounting holes, oval holes and other square holes in the board should be more than 3mm away from the board edge;</span> </p><p style="text-align:center;"><span style="font-size:14px;"></span><img src="https://file.allpcb.com/bbs/17/05/15/144020685.jpg" alt=""/> </p><p><span style="font-size:14px;">7. Heating components cannot be close to the wire and thermal components; high thermal devices should be balanced evenly;</span> </p><p><br/></p><p><span style="font-size:14px;">8. Arranging as far as possible around the printed circuit board, the power outlet and the bus bar terminals connected to it should be arranged in the same side. In particular, do not place the power outlet and other solder connectors between the connectors to facilitate the design and bundle of these sockets, connectors and power cables. The layout of power outlet and welding connector should be considered to facilitate the power plug;</span> </p><p><span style="font-size:14px;">9. The layout of other components</span> </p><p><span style="font-size:14px;">All the IC components are aligned side by side; the polarity of the components should be marked clearly but shouldn’t be in more than two directions in the same printed circuit board, or the directions need to be perpendicular to each other;</span> </p><p style="text-align:center;"><span style="font-size:14px;"></span><img src="https://file.allpcb.com/bbs/17/05/15/144454364.jpg" alt=""/> </p><p><span style="font-size:14px;">10. The board wiring should be well-balanced and should be filled with mesh copper when the density difference is too large, and the gridding is more than 8mil (or 0.2mm);</span> </p><p><span style="font-size:14px;">11. The pad cannot have through-hole to avoid the poor solder paste in components. Important signal lines are not allowed to pass through the socket feet;</span> </p><p><span style="font-size:14px;">12. Pay attention to patch unilateral alignment and the character direction and packaging direction should be consistent;</span> </p><p><span style="font-size:14px;">13. The polarity mark of the device in the same board should be as much as possible consistent.</span> </p><p><br/></p>