Practical Electronics/7400 Series/Labelling

74 and 54 Series ICs all have a code on the top of the carrier body. This can be printed (usually in white) or etched. It consists of a "core" code which identifies the IC's function, and the type of electronics used within it. This is often supplemented by manufacturer's prefixes and suffixes which give information about the manufacturer and the carrier's physical form. center|500px Core Code Device Family 74 means a "commercial grade" device, suitable for general use. 54 means a "military grade" device, for use in more hostile environments. Device Type CodeMeaningTTL(none)Standard TTLNStandard TTLLLow-power TTLSSchottky TTLLSLow-power Schottky TTLASAdvanced Schottky TTLALSAdvanced Low-power Schottky TTLFFast TTLCMOSCCMOSHCHigh-speed CMOS, inputs CMOS compatibleHCTHigh-speed CMOS, inputs TTL compatibleACAdvanced CMOS, inputs CMOS compatibleACTAdvanced CMOS, inputs TTL compatibleAHCAdvanced High-speed CMOS, inputs CMOS compatibleAHCTAdvanced High-speed CMOS, inputs TTL compatibleLVLow-voltage CMOSLVCLow-voltage CMOSALVCAdvanced Low-voltage CMOS, inputs CMOS compatibleALVTAdvanced Low-voltage CMOS, inputs TTL compatibleAUCAdvanced Ultra-Low-voltage CMOSAUPAdvanced Ultra-Low-power CMOSAVCAdvanced Very-Low-voltage CMOS LogicFCTFast CMOSGTLPGunning Transceiver Logic PlusBiCMOSBCTBiCMOSABTAdvanced BiCMOSLVTLow-Voltage BiCMOSALBAdvanced Low-Voltage BiCMOSABTEAdvanced BiCMOS / Enhanced Transceiver LogicFBBackplane Transceiver LogicGTLGunning Transceiver LogicHSTLHigh-speed Transceiver LogicSSTLStub Series Terminated LogicSSTUStub Series Terminated Logic (Ultra-Low-voltage)SSTVStub Series Terminated Logic (Very-Low-voltage) Device Function This code tells you what the IC does. There are hundreds of these codes. Many common ones are given on the 74 Series page. Manufacturer Information Prefix This tells you which company made the IC. There a many hundred of different prefixes, and dozens of manufacturers, some sharing the same prefix. As these prefixes are not unique to the 74 Series of ICs, these prefixes are listed separately and can be found here. Suffix This tells you the type of package that the IC comes in, for example a DIP. It can also give information about the material (e.g. ceramic or plastic). These suffixes are not unique to the 74 Series of ICs, and as such, they are listed on a separate page, here.