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modules/usb_a_plug_smt.fpd: enlarge signal pads by 0.2 mm
- modules/usb_a_plug_smt.fpd: move the far edge of the signal pads out by 0.2 mm, moving their center by 0.1 mm - modules/INFO: explain why Molex' calculation seems to be questionable
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modules/INFO
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modules/INFO
@ -66,6 +66,22 @@ F: mmcx-f-edge
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N: 73415-0961
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# USB A plug for SMT
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#
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# Note: the signal pads are enlarged by 0.2 mm and their center is shifted by
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# 0.1 mm with respect to the reference.
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#
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# According to the data sheet, the leads terminate at (2.00+/-0.10 mm)/2+
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# 2.48 mm = 3.48+/-0.10 mm from the center. The reference footprint puts the
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# edge of the pads at (2.00+/-0.10 mm)/2+2.6 mm = 3.6 mm+/-0.10 mm, so the
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# maximum lead end could be at 3.58 mm while the minimum pad edge could be at
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# 3.5 mm.
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#
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# Assuming that the pad is intended to extend a bit beyond the lead, we need
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# to add 0.2 mm to compensate for these tolerances. (The pad tolerance may not
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# be intended to be used this way, however, we still have to consider small
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# errors in registration, which also amount to about 0.1 mm, so the calculation
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# remains valid.)
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#
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F: usb_a_plug_smt
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# SOT-323 package with counter-clockweise or clockwise pin assignment
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@ -3,7 +3,7 @@
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frame pad {
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table
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{ h, w }
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{ 2mm, 1.2mm }
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{ 2mm+2*enlarge, 1.2mm }
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__0: vec @(w/2, h/2)
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__1: vec @(-w/2, -h/2)
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@ -18,7 +18,9 @@ frame pads {
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{ 3, -1mm }
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{ 4, -3.5mm }
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__0: vec @(0mm, 2.6mm)
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set enlarge = 0.1mm
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__0: vec @(0mm, 2.6mm+enlarge)
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__1: vec .(x, 0mm)
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frame pad .
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}
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