LED PCB board design Guidelines [Part 9]
Component assembly related to the LED PCB board design.
This common sense is widely known, but how to handle the place of the LED PCB board component is really a problem for designers.
Size Your Component Hole Thermal Pads Appropriately
As with vias, multiple, closely-spaced thermal pads on component holes can end up overlapping to cause an open.
Another issue is that if the inner diameter is grossly oversized, there will be so much copper presents that the pad will no longer serve its thermal function (that of maintaining an appropriate high temperature in the barrel of the hole during the solder cycle.)
The inner diameter of your thermal pads should typically match the diameter of your external layer pads.
All vias in the violet plane areas are direct-connect, with no thermal pads and no small location dots. This is the correct appearance for vias connecting to planes.
From epectec, original author have all right.
Original title:TOP 10 PRINTED CIRCUIT BOARD DESIGN CHECKS
MCPCB experts recommend top 10 design tips:
- Avoid Placing Vias at the End of SMT Pads
- Do Not Route Wide Traces Into Narrow SMT Pads
- Do Not Route Traces Along Sides of SMT Pads.
- Route All Traces at 90 Degrees or Greater
- Don’t Place Components Too Close to the PCB Outline
- Never Export English-Unit Gerber or Drill Files at 2:3 Decimal Resolution
- Size Your Solder Mask Openings Consistently
- Always Use Direct Connect for Vias
- Size Your Component Hole Thermal Pads Appropriately
- Allow Enough Clearance Between Unsupported PTHs and Adjacent Copper Features on Internal Layers