i am going to design footprint for a devise and i need to know spacing between pads. do you know what does (2-1.27) mean?
the devise is pico oem socket.
thanks
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\$\begingroup\$ '1.27'(mm) is the pitch. Not sure what the '2-' refers to. A link to the datasheet would be handy - it might be something to do with tolerances which would be noted elsewhere on the diagram. \$\endgroup\$– Tom CarpenterCommented Nov 5, 2016 at 22:25
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\$\begingroup\$ I think "2" refers to 2 rows, one each side of the device, and 1.27 is the pitch. As a cross-check, 23 * 1.27 = 29.21, the marked dimension between the outer pads. \$\endgroup\$– user16324Commented Nov 5, 2016 at 22:28
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2\$\begingroup\$ Not first time I see this drawing. Mohammad, can you share datasheet please? Cropped picture at the top left seems to be a socket or connector. \$\endgroup\$– AnonymousCommented Nov 5, 2016 at 22:30
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\$\begingroup\$ @Anonymous I had the same deja vu \$\endgroup\$– Marcus MüllerCommented Nov 5, 2016 at 22:40
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3\$\begingroup\$ I'm voting to close this question as off-topic because the question might be much easier to answer with access to the datasheet or more information on the component. However, OP prefers to keep silent, as in his other question. \$\endgroup\$– Marcus MüllerCommented Nov 5, 2016 at 22:41
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1 Answer
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1.27 refers to the pad-to-pad pitch. There are 24 pads per column, so 23 intervals. 23 times 1.27 is 29.21 which is shown below. The "2-" refers to the fact that this spacing occurs in two different places, once on the left column and once on the right. It lets you know that the specification does not apply only to the column shown.
Likewise, the specification for the horizontal row small pad spacing "2-1.27(15x)" shows that 16 pads are involved, and the spacing applies both to the upper and lower rows.
answered Nov 5, 2016 at 23:06
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\$\begingroup\$ Yes i guessed it is probably like what you said and i used them in my design but when i downloaded 3d model for that, it seemed to be wrong . I don't know maybe the 3d model i found, is not correct. \$\endgroup\$ Commented Nov 6, 2016 at 13:55