searching datasheets & components

datasheets
http://www.google.com/
http://www.datasheetlocator.com/ko/
http://www.alldatasheet.com/
http://www.datasheetcatalog.com/

components
http://www.questlink.com/
http://icat.snu.ac.kr/chipdir/
http://bgs.nu/sdw

company links site
http://www.icfinder.co.kr