scope:

This standard includes several new items and has been completely rewritten from the original EIA-370. The first is a new letter symbol C so that a JEDEC type designation may now be 2C1234, to indicate that a chip is being designated that if it were properly mounted on the package registered for the 2N1234, it would display characteristics similar to those of the 2N1234. The second major addition is the method for assigning the first numeric symbol for type designations of optoelectronic devices. ANSI/EIA-370-B-1992.