Bonding Capillaries Bonding Evolution 2018 by SPT - Small Precision Tools

More catalogs by SPT - Small Precision Tools | Bonding Capillaries Bonding Evolution 2018 | 41 pages | 2018-02-19

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Page 17 of Bonding Capillaries Bonding Evolution 2018

basic capillary design rules critical loop height clh is defined as the height of the loop that is in-line with the centerline of the capillary when viewed from the side or parallel to the adjacent wire once the wire passed the centerline the capillary has already cleared and no adjacent loop disturbance is observed high reverse loop critical loop height normal loop wd or fa h cd t ca cross section diagram of capillary tip profile capillary dimensions directly affecting the ball bond formation  hole size h is determined based on the wire diameter wd to be used in a given application typically the ratio is around 1.2x to 1.5x of the wd a smaller hole size ratio is necessary for ultra-fine pitch application to compensate for the smaller chamfer diameter requirement h wd  chamfer diameter cd is determined based on the targeted mashed ball diameter mbd normally the mbd is restricted by the bond pad-opening dimension mbd cd back to content 17