Uni-pad surface mount component package

Details Uni-pad surface mount component package Uni-pad surface mount component package

H - Electricity

05

K

H05K 3/32 (2006.01) H05K 1/00 (2006.01) H05K 1/11 (2006.01) H05K 3/34 (2006.01)

Patent

CA 2200122

A uni-pad structure on the surface of a PWB comprising a pair of complimentary pads, arranged on an axis, whose dimensions are selected to support the terminals of a plurality of surface mount component sizes. The width of each pad is the width of the widest anticpated surface mount component which may be substituted. A first distance, denoting the separation of the inner edges of each pad, is selectd as the minimum distance between inner edges of the terminals of the anticipated surface mount components. A second distance, denoting the distance between outer edges of the complimentary pads is selectd as the maximum distance between outer edges of the terminals of anticipated surface mount components. A second distance, denoting the distance between outer edges of the complimentary pads is selected as the maximum distance btween outer edges of the terminals of anticipated surface mount components. Manufacturing tolerances may be incorporated into each of these dimensions. A design process is described which considers the dimensions of surface mount components which are likely to be substituted and manufacturing tolerance which may be added to or substracted from the dimensions of the uni-pad.

Structure à pastille principale à la surface d'une carte imprimée comprenant une paire de pastilles complémentaires disposées sur un axe, dont les dimensions sont choisies de manière à pouvoir recevoir les bornes de composants montés en surface ayant des dimensions variées. La largeur de chaque pastille est celle du composant monté en surface le plus large prévu qui peut être substitué. Une première distance, marquant la séparation des bords intérieurs de chaque pastille, est choisie comme distance minimale entre les bords intérieurs des bornes des composants montés en surface prévus. Une deuxième distance, marquant la distance entre les bords extérieurs des pastilles complémentaires est choisie comme distance maximale entre les bords extérieurs des bornes des composants montés en surface prévus. Les tolérances de fabrication peuvent être intégrées à chacune de ces dimensions. Il y a aussi une description du procédé de fabrication qui tient compte des dimensions des composants montés en surface qui sont susceptibles d'être substitués à d'autres et des tolérances de fabrication qui peuvent être ajoutées aux dimensions de la pastille principale ou en être retranchées.

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