Check RF6886

[Alenux55]

Datasheet: http://www.planetec.com/product/datasheet/RF6886.pdf Symbol: RF6886 Footprint: QFN-24

[Alenux55]

Correct:

• Pad spacing is correct
• Pad locations are correct
• Pad sizes are correct
• Solder mask clearance is correct

Incorrect:

• Paste mask is different
  • Datasheet specifies non-constant paste mask clearance:
  • Rather than making a custom paste mask for each outer pin, just make the area of paste the same so we can use the global paste mask value: 0.234 mm*0.475 mm = 0.11115 mm² -> (0.260 - x)*(0.528 - x) = 0.11115 -> x² - 0.788x + 0.13728 = 0.11115 -> x² - 0.788x + 0.02613 = 0 -> Quadratic forumla... -> x = 0.75331 mm, 0.03469 mm ->
  • So we'll choose a clearance of 0.035 mm to give an area of 0.110925 mm²

[Alenux55]

Fixed in 2a479b9

[Alenux55]

Note: clearance should be 0.0175 mm instead of 0.035 mm; the clearance is around the pad, while the value I calculated is total width increase