(19)

(11)

EP 0 765 529 A2

(12)

(43) Date of publication: 02.04.1997 Bulletin 1997/14 (21) Application number: 95937353.0 (22) Date of filing: 13.10.1995

(51) International Patent Classification (IPC):  H01L 23/ 29( . ) H01L 23/ 31( . ) (86) International application number: PCT/US1995/012808 (87) International publication number: WO 1996/013055 (02.05.1996 Gazette 1996/20)

(84) Designated Contracting States: DE FR GB (30) Priority: 13.10.1994 US 19940322769 (71) Applicant: NATIONAL SEMICONDUCTOR CORPORATION Sunnyvale, CA 95086-3737 (US)	(72) Inventors: CHEN, Andrea, Shu-hui Mountain View, CA 94041 (US) LO, Randy, Hsiao-Yu Campbell, CA 95008 (US) TAKIAR, Hem Fremont, CA 94539 (US) (74) Representative: Bowles, Sharon Margaret, et al  BOWLES HORTON Felden House Dower Mews High Street Berkhamsted Hertfordshire HP4 2BL Berkhamsted Hertfordshire HP4 2BL (GB)