Ball grid array: Difference between revisions

Revision as of 11:03, 11 March 2022

Revision as of 00:04, 24 August 2022

Line 42:

===Difficulty of inspection===

Once the package is soldered into place, it is difficult to find soldering faults. [[X-ray]] machines, [[industrial CT scanning]] machines,<ref>"CT Services - Overview." Jesse Garant & Associates. August 17, 2010. {{cite web|url=http://www.jgarantmc.com/ct-services.html |title=ArchivedIndustrial copyComputed Tomography Scanning Services – JG&A |access-date=2010-11-24 |url-status = dead|archive-url=https://web.archive.org/web/20100923150138/http://www.jgarantmc.com/ct-services.html |archive-date=2010-09-23 }}</ref> special microscopes, and endoscopes to look underneath the soldered package have been developed to overcome this problem. If a BGA is found to be badly soldered, it can be removed in a ''[[rework station]]'', which is a jig fitted with infrared lamp (or hot air), a [[thermocouple]] and a vacuum device for lifting the package. The BGA can be replaced with a new one, or it can be refurbished (or ''reballed'') and re-installed on the circuit board. Pre-configured solder balls matching the array pattern can be used to reball BGAs when only one or a few need to be reworked. For higher volume and repeated lab work, a stencil-configured vacuum-head pick-up and placement of loose spheres can be used.

Due to the cost of visual X-ray BGA inspection, electrical testing is very often used instead. Very common is [[boundary scan]] testing using an IEEE 1149.1 [[JTAG]] port.

Line 109:

== Procurement ==

Primary end-users of BGAs are [[original equipment manufacturer]]s (OEMs). There is also a market among electronic hobbyists [[Do it yourself|do it yourself (DIY)]] such as the increasingly popular [[maker culture|maker movement]].<ref>{{cite news|title=More than just digital quilting: The "maker" movement could change how science is taught and boost innovation. It may even herald a new industrial revolution|url=http://www.economist.com/node/21540392|worknewspaper=The Economist|date=Dec 3, 2011}}</ref> While OEMs generally source their components from the manufacturer, or the manufacturer's distributor, the hobbyist will typically obtain BGAs on the aftermarket through electronic component brokers or [[:Category:Electronic component distributors|distributors]].

== See also ==