Why do integrated circuits have designated numbers written on their backs instead of simply having… by Yash Bhardwaj
Answer by Yash Bhardwaj:
Because it's feasible to tell about the
3. Logic series
by just using some numbers and alphabets.
This code normally consists of two letters and is a code normally used by a given manufacturer. SM is one used by Texas Instruments.
This is indicated by these two figures. 74 indicates (0°C to 70°C commercial and 54 military (-55°C to +125°C.
This is the sub-family. 7400 for example is the basic series, but there are many others as defined above.
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.
Hope this helps.