The part number for most logic ICs gives a lot of information about its function, performance and manufacturer.
It is possible to tell the logic family, the manufacturer and various other elements of the performance of the logic IC simply by looking at the number and deciphering the code.
There are several different types of numbering system, dependent upon the overall logic family in question.
7400 series IC numbering
The most widely used logic family is the 7400 series, i.e. 74xx00 series and all its derivatives. The derivation of these IC numbers is given below:
It can be seen that this IC part number consists of a number of elements:
|Part Numbering Scheme for 74xx00 Series Logic ICs
|This code normally consists of two letters and is a code normally used by a given manufacturer. SN is one used by Texas Instruments. Other manufacturers have their own codes that they place here.
|This is indicated by these two figures. 74 indicates 0°C to 70°C commercial and 54 military: -55°C to +125°C. For most applications the 74 series is perfectly acceptable and this series will be found in consumer devices.
|This is the sub-family. 7400 for example is the basic series, but there are many others.
|This indicates the device function / type. For example devices with 04 are hex inverters, etc. They are the common across all sub-families.
|This is the package suffix. It is necessary to refer to the manufacturers datasheets as these codes vary between manufacturers.
4000 series IC numbering
The 4000 series was the first family or series of CMOS ICs. They were widely used in their day and although available today, they are not as widely used.
It can be seen that this part number consists of a number of elements:
|Part Numbering Scheme for 4000 Series Logic ICs
|This code normally consists of two letters and is a code normally used by a given manufacturer. HEF is what used to be Mullard / Phillips.
|This is indicated by these the 4 in the 4000 figure.
|This indicates the device function / type. For example devices the 01, i.e. 4001 is a quad 2-input NOR.
|Early devices did not have any output buffering and were lacking in drive. Later versions were buffered and these chips had the "B" suffix added to the part number.
These are some of the major logic IC numbering systems. Others are available for other forms of logic, but these IC numbering schemes are not as widely used.
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