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    IC  Prefix

ALDxxx
ADxx, OPxx
OPAxx, INAxx
ELxxx
uAxx, RCxx, KAxx, LMxx
MBxxx
CAxx, HAxx, HCxx, HFxx
LTxx, LMxx, LFxx, OPxx
MAXxx, ICLxx
MICxxx
MCxxxx, MCxxxxx, etc.
LMxx, LFxx, LHxx, CLCxx
NExx, SAxx
BAxxx
LMxx, MCxx, TSxx, etc.
TLxx, TLCxx, TLVxx
TAxxx

    Manufacturer

Advanced Linear Devices
Analog Devices  (PMI)
Burr-Brown
Elantec
Fairchild
Fujistu
Intersil
Linear Technology
Maxim
Micrel
Motorola
National Semiconductor
Philips Semiconductor
Rohm
ST Microelectronics
Texas Instruments (TI)
Toshiba

    Phone

408-747-1555
800-262-5643
520-746-1111
888-352-6832
207-775-8100
408-922-9000
407-724-7000
408-432-1900
408-737-7600
408-944-0800
800-521-6274
800-272-9959
800-234-7381
615-641-2020
781-259-0300
972-644-5580
212-596-0600

    Website  URL

http://www.ald.com
http://www.analog.com
http://www.burr-brown.com
http://www.elantec.com
http://www.fairchildsemi.com
http://www.fujitsumicro.com
http://www.intersil.com
http://www.linear-tech.com
http://www.maxim-ic.com
http://www.micrel.com
Http://e-www.motorola.com
http://www.national.com
http://www.semiconductor.philips.com
http://www.rohm.com
http://www.st.com
http://www.ti.com
http://www.toshiba.com/taec

This list is by no means complete or definitive.  There have been many mergers and acquisitions in the history of the electronics industry.  For example, Fairchild acquired the Raytheon semiconductor line in 1997, which line included RC and RM prefix ICs.  More recently, Intersil acquired the Harris semiconductor line, which line included the old Harris HA series parts found in many logging tools along with the CA series parts found in many Comprobe tools (originally made by RCA and acquired by Harris).  Incidentally, Intersil should be lined up and shot for discontinuing the popular CA3094 right after acquiring the Harris line.

If you are working with chips, check out the Chip Directory.  The Chip Directory and the mailing list associated with it are wonderful resources.  More than once the friendly and helpful members of the list have bailed us out of technical difficulty.

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Last 10-20-10