If you are looking for Signetics IDM part numbers that division has been spun
off and is now NXP Semiconductor http://www.nxp.com/. Signetics is no longer affiliated with any products from that business group.

Link : SIGNETICS SAT SUPPLIER.pdf

  HQ
Location Paju : Near Seoul, 70 Km from Incheon Airport
Address : 483-3 Buphung-ri Thanhyun-myun,
Paju-si Gyungki-do,
Republic of Korea 413-840
Tel : 82-31-940-7681 ("Only Korean service is available.")
(For English service, please dial 82-31-940-7660.   YH Kang)
Fax : 82-31-940-7888
Contact us : bsyoon   ( bsyoon@signetics.com )

  US Office (Fremont)
Address : Signetics High Technology, Inc.
200 Brown Road Suite 300
Fremont, CA 94539-7953
Tel : 408-907-0121
Cell : 925-980-6515
Contact us : Mike stokman, mstokman@signetics.com