Editing Pin grid array (section)

== Pin layout ==

=== Staggered pin ===
The staggered pin grid array (SPGA) is used by Intel processors based on [[Socket 5]] and [[Socket 7]].  [[Socket 8]] used a partial SPGA layout on half the processor.
[[File:Socket 7.jpg|right|thumb|300px|An example of a socket for a staggered pin grid array package]]

[[File:Cyrix IBM CPU 6x86MX PR200 bottom.jpg|thumb|View of the socket 7 321-pin connectors of a CPU]]

It consists of two square arrays of pins, offset in both directions by half the minimum distance between pins in one of the arrays. Put differently: within a square boundary the pins form a diagonal square [[Lattice (group)|lattice]]. There is generally a section in the center of the package without any pins. SPGA packages are usually used by devices that require a higher pin density than what a PGA can provide, such as [[microprocessor]]s.

=== Stud ===
A stud grid array (SGA) is a short-pinned pin grid array chip scale package for use in [[surface-mount technology]]. The polymer stud grid array or plastic stud grid array was developed jointly by the [[Interuniversity Microelectronics Centre]] (IMEC) and [[Laboratory for Production Technology]], [[Siemens AG]].<ref>{{cite web|url=http://www.jsits.com/bga-socket/bga_summary.htm |title=BGA socket/BGA 소켓 |publisher=Jsits.com |access-date=2015-06-05}}</ref><ref>[http://www.atplas.com/de/index/mr_index/mr_news/mr_news_business/mr_news_business-fullpage.htm?printout=1&id=7921 link] {{in lang|de}} {{webarchive |url=https://web.archive.org/web/20111001232205/http://www.atplas.com/de/index/mr_index/mr_news/mr_news_business/mr_news_business-fullpage.htm?printout=1&id=7921 |date=October 1, 2011 }}</ref>

=== rPGA ===
The reduced pin grid array was used by the socketed mobile variants of Intel's Core i3/5/7 processors and features a reduced pin pitch of 1{{nbsp}}mm,<ref>{{cite web|title=Molex Sockets for Servers, Desktops and Notebooks Earn Intel® Validation|url=http://www.molex.com/mx_upload/editorial/833/Sockets_earn_intel_validation_pr.html|access-date=2016-03-15|archive-date=2019-12-09|archive-url=https://web.archive.org/web/20191209133509/http://www.molex.com/mx_upload/editorial/833/Sockets_earn_intel_validation_pr.html|url-status=dead}}</ref> as opposed to the 1.27{{nbsp}}mm pin pitch used by contemporary AMD processors and older Intel processors. It is used in the [[Socket G1|G1]], [[Socket G2|G2]], and [[Intel Socket G3|G3]] sockets.