Socket boundary: Keep other layout elements outside the socket boundary dimensions.
Pads: 0.58mm (0.023 in) wide x 0.71mm (0.028) ovals. Surface finish should be HASL immersion silver or gold over nickel. A trace between pads must maintain a solder mask web. Solder masks must not fall within each pad’s boundary.
Keying hole: 0.84mm (0.033 in), ± 0.03mm (0.001 in) tolerance. This hole receives the keying pin on the bottom of the socket module. The keying pin on the socket bottom is on the same end as the “keying tab” mentioned above which is visible once the socket is installed.
Retention hole pads: 0.51 mm (0.020 in) wide, ± 0.08mm (0.003 in) tolerance. Do not tie to ground plane. Socket module pins are soldered to these pads from the top.
