LASER SOLDERING AND INSPECTION OF FINE-PITCH ELECTRONIC COMPONENTS

Citation
A. Flanagan et al., LASER SOLDERING AND INSPECTION OF FINE-PITCH ELECTRONIC COMPONENTS, Journal of materials processing technology, 56(1-4), 1996, pp. 531-541
Citations number
10
Categorie Soggetti
Material Science
ISSN journal
09240136
Volume
56
Issue
1-4
Year of publication
1996
Pages
531 - 541
Database
ISI
SICI code
0924-0136(1996)56:1-4<531:LSAIOF>2.0.ZU;2-A
Abstract
The increasing miniaturisation of integrated circuits has resulted in devices with lead spacings as small as 0.008 ''. Laser soldering has t he potential to overcome many of the problems encountered with these d evices by conventional soldering technologies. Nd:YAG laser soldering of a 224-lead ceramic chip onto a FR4 circuit board is described, usin g experimental design to optimise the laser parameters for soldering. In order to improve solder joint quality and repeatability, a rigorous thermal analysis is undertaken using a finite element model to invest igate the temperature rise variations between the joints. Thermocouple measurements are made in real time of the laser soldering process to confirm the finite element model predictions.