| C |
CRYST, CSEMI, Exar, Intel, IR, KEMET, Motorola |
| CA |
CSEMI, GE/RCA, Harris, KEMET, Motorola, RCA, TRW |
| CAL |
ICT* |
| CAT |
Catalyst, CSEMI |
| CAV |
AD |
| CC* |
Chipcon |
| CD |
CORN, GE/RCA, Goldstar, Harris, Motorola, NS, NS, Philips, RCA, TI |
| CDC |
TI |
| CDLL |
CDI |
| CDP |
GE/RCA, Harris |
| CF |
KOA, TI |
| CFC |
Feiya |
| CG |
GI |
| CGS |
MALLO, NS |
| CH |
Motorola |
| CK |
KEMET |
| CL |
ClearLogic |
| CL-GD |
Cirrus |
| CLC |
Comlinear |
| CLGD |
Cirrus |
| CM |
CHIC, Mitel (=Module), Supertex |
| CMF |
DALE |
| CMP |
AD, PMI |
| CMX |
CML (most recent devices) |
| CNW |
HP |
| CNX |
QT, Siemens |
| CNY |
Motorola, QT, Siemens, Signetics |
| COM |
SMC |
| COP |
Harris, NEC, NS, NS |
| COPC |
NEC |
| CP |
Harris, TI |
| CPC |
Clare (formerly CP Clare) |
| CQY |
Telefunken |
| CR |
Hitachi, Mitsubishi, Panasonic, Philips, Sony |
| CRT* |
Siliconix, SMC |
| CS |
CSI, Cirrus, CRYST, Crystal, CSEMI, Harris, NS |
| CSAC |
MURAT |
| CSC |
DALE |
| CSK |
Sony |
| CSM |
TI |
| CT |
Catalyst, Philips |
| CTB |
Fuji, Sanken |
| CTC* |
Kyocera |
| CV |
Philips |
| CW |
Goldstar |
| CWB |
CLOG |
| CX |
CRYST, Cyrix, Sony, Sony, Xicor |
| CXA |
SOLID, Sony |
| CXB |
Sony |
| CXD |
Sony |
| CXK |
Motorola, Sony |
| CXL |
Sony |
| CXP |
Sony |
| CXQ |
Sony |
| CY |
Cypress |
| CYN |
QT |
