(19)

(11)

EP 0 758 488 A1

(12)

(43) Date of publication: 19.02.1997 Bulletin 1997/08 (21) Application number: 96910413.0 (22) Date of filing: 06.03.1996

(51) International Patent Classification (IPC):  H01L 23/ 433( . ) (86) International application number: PCT/US1996/003282 (87) International publication number: WO 1996/027903 (12.09.1996 Gazette 1996/41)

(84) Designated Contracting States: DE FR GB (30) Priority: 06.03.1995 US 19950399173 (71) Applicant: National Semiconductor Corporation Santa Clara, CA 95052 (US)	(72) Inventors: MOSTAFAZADEH, Shahram San Jose, CA 95136 (US) KIM, Hee, Jhin San Jose, CA 95129 (US) (74) Representative: Horton, Andrew Robert Grant, et al  BOWLES HORTON Felden House Dower Mews High Street Berkhamsted Hertfordshire HP4 2BL Berkhamsted Hertfordshire HP4 2BL (GB)