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http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en010406
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http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en010406
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http://lwn.net/Articles/168961/
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http://lwn.net/Articles/168961/
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http://linux.derkeiler.com/Mailing-Lists/Kernel/2006-01/msg09132.html
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http://linux.derkeiler.com/Mailing-Lists/Kernel/2006-01/msg09132.html
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http://www.canexperts.de/engl/canprod/sw_driv_list.html
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http://www.canexperts.de/engl/canprod/sw_driv_list.html
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------------------------------------------------------------------------
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SOIC18
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SOIC18
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http://www.luciani.org/geda/pcb/footprints-gif/SOIC-gif.html
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http://www.luciani.org/geda/pcb/footprints-gif/SOIC-gif.html
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page 77 of datasheet
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18N
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1.27mm = 127P
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SOIC_127P_40L1_31L2_1155L_750W_265H_18N__MICROCHIP_MCP2515.fp
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SOIC_127P_40L1_18N__MICROCHIP_MCP2515.fp
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lead width = 0.31mm
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food length = 0.40mm
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footprint = 1.4mm
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• Lead span 1 (L1) is along the length and lead span 2 (L2) is along the width.
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Identifier  Description        Type
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P           pin spacing        dimension
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C           pin columns        count
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R           pin rows           count
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N           pin count          count
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d           pin diameter       dimension
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H           height             dimension
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L           body length        dimension
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W           body width         dimension
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D           body diameter      dimension
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L1          lead span 1        dimension
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L2          lead span 2        dimension
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WT          thermal pad width  dimension
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LT          thermal pad length dimension
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TP          thermal pad        boolean
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PS          pad size           dimension
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MS          mask size          dimension