Powerpcb Training Manual, Your First Design s2

Appendix O

METRIC MADE EASY

VIA TECHNOLOGY

DRILL SIZE /

PAD SIZE

PLACEMENT & ROUTING TECHNOLOGY

PLACE GRID

TRACE WIDTH

/ CLEARANCE / ROUTE GRID
INCH / METRIC / INCH / METRIC / INCH / METRIC / INCH / METRIC
.005 / .10 / .004 / .10 / .004 / .10 / .00416 / .10
.010 / .20 / .005 / .127 / .005 / .127 / .005 / .127
.0125 / .30 / .006 / .15 / .00625 / .15 / .00625 / .15
.025 / .60 / .008 / .20 / .0072 / .20 / .00833 / .20
.040 / 1.00 / .010 / .25 / .015 / .25 / .0125 / .25
.050 / 1.27 / .012 / .30 / .0125 / .30 / .0125 / .30
.075 / 2.00 / .016 / .40 / .009 / .40 / .025 / .40
.100 / 2.50 / .020 / .50 / .030 / .50 / .025 / .50
.025 / .60 / .025 / .60 / .025 / .60
.030 / .75
.040 / 1.00
.050 / 1.27
.080 / 2.00
.100 / 2.50
.140 / 3.50
.200 / 5.00

The basic principle is to substitute the Inch value to the corresponding, rounded Metric value.

Trace widths over .025 will have custom, default clearances and routing grids.

PLATED THROUGH PADSTACK TECHNOLOGY

DRILL SIZE /

PAD SIZE

/ PLANE CLEAR / SOLDER MASK
INCH / METRIC / INCH / METRIC / INCH / METRIC / INCH / METRIC
.008 / .20 / .018 / .45 / .040 / 1.00 / .022 / .55
.010 / .25 / .020 / .50 / .040 / 1.10 / .024 / .60
.012 / .30 / .024 / .60 / .045 / 1.20 / .029 / .70
.014 / .35 / .025 / .65 / .045 / 1.25 / .029 / .75
.016 / .40 / .030 / .75 / .050 / 1.30 / .034 / .85
.018 / .45 / .035 / .90 / .050 / 1.35 / .039 / 1.00
.020 / .50 / .040 / 1.00 / .055 / 1.40 / .044 / 1.10
.024 / .60 / .050 / 1.27 / .060 / 1.60 / .054 / 1.40
.028 / .70 / .055 / 1.40 / .065 / 1.70 / .059 / 1.50
.032 / .80 / .055 / 1.40 / .065 / 1.80 / .059 / 1.50
.035 / .85 / .055 / 1.40 / .075 / 1.90 / .059 / 1.50
.037 / .90 / .060 / 1.50 / .080 / 2.00 / .064 / 1.60
.040 / 1.00 / .060 / 1.50 / .080 / 2.00 / .064 / 1.60
.043 / 1.10 / .065 / 1.60 / .085 / 2.10 / .069 / 1.70
.047 / 1.20 / .070 / 1.80 / .090 / 2.20 / .074 / 1.90
.052 / 1.30 / .080 / 2.00 / .095 / 2.30 / .084 / 2.10
.057 / 1.40 / .090 / 2.30 / .100 / 2.40 / .094 / 2.40
.062 / 1.60 / .100 / 2.50 / .105 / 2.60 / .104 / 2.60
.067 / 1.70 / .110 / 2.80 / .110 / 2.70 / .114 / 2.90
.072 / 1.80 / .120 / 3.00 / .115 / 2.80 / .124 / 3.10
.078 / 1.90 / .130 / 3.30 / .120 / 2.90 / .134 / 3.40
.082 / 2.00 / .135 / 3.50 / .125 / 3.00 / .135 / 3.60
.087 / 2.20 / .140 / 3.60 / .130 / 3.20 / .144 / 3.70
.093 / 2.30 / .150 / 3.80 / .135 / 3.30 / .154 / 3.90
.098 / 2.50 / .150 / 3.80 / .140 / 3.50 / .154 / 3.90
.102 / 2.60 / .160 / 4.10 / .150 / 3.70 / .164 / 4.20
.110 / 2.80 / .170 / 4.40 / .160 / 3.90 / .174 / 4.50
.125 / 3.20 / .200 / 5.00 / .175 / 4.30 / .204 / 5.10
.128 / 3.20 / .200 / 5.00 / .175 / 4.30 / .204 / 5.10
.144 / 3.60 / .225 / 5.70 / .200 / 4.70 / .229 / 5.80
.156 / 3.90 / .250 / 6.40 / .210 / 5.00 / .254 / 6.50
.187 / 4.70 / .300 / 7.60 / .250 / 5.80 / .304 / 7.70
.225 / 5.70 / .350 / 8.90 / .275 / 6.80 / .354 / 9.00

NON-PLATED PADSTACK TECHNOLOGY

DRILL SIZE

PAD SIZE

/ PLANE CLEAR / SOLDER MASK
INCH / METRIC / INCH / METRIC / INCH / METRIC / INCH / METRIC
.020 / .50 / .015 / .20 / .055 / 1.40 / .024 / .60
.032 / .80 / .015 / .50 / .065 / 1.65 / .036 / .90
.062 / 1.60 / .050 / 1.00 / .105 / 2.60 / .066 / 1.70
.093 / 2.40 / .050 / 1.00 / .135 / 3.40 / .097 / 2.50
.098 / 2.50 / .050 / 1.00 / .140 / 3.50 / .102 / 2.60
.110 / 2.80 / .050 / 1.00 / .160 / 3.90 / .114 / 2.90
.125 / 3.20 / .050 / 1.00 / .175 / 4.30 / .129 / 3.30
.128 / 3.20 / .050 / 1.00 / .175 / 4.30 / .132 / 3.30
.144 / 3.60 / .050 / 1.00 / .200 / 4.70 / .148 / 3.70
.156 / 4.00 / .050 / 1.00 / .210 / 5.10 / .160 / 4.10
.187 / 4.80 / .050 / 1.00 / .250 / 5.90 / .191 / 4.90
.225 / 5.70 / .050 / 1.00 / .275 / 6.80 / .229 / 5.80
.265 / 6.70 / .050 / 1.00 / .315 / 7.80 / .269 / 6.80

Notes:

The following information is how to calculate a plated through padstack from a component lead using Metric units.

1. The Finished Hole Size is .40mm larger than the component lead, ±.10mm.

2. The Pad Size is .50mm larger than the Finished Hole Size, +.20mm -.00mm.

3. The Plane Clearance is 1.0mm larger than the Finished Hole Size, ±.20mm.

4. The Solder Mask Clearance is .10mm larger than the Pad Size for through holes, .10mm larger than Drill Size for non-plated holes.

O.3