why ICS starts with 74

Answer Posted / peddapalli saikumar

some ics r there wich starts with 78 and 79 series.
eg: in 7805 the 78 is a symbol for +ve voltage and 05 is a indiction of voltage quantity,
in 7905 the 79 indicates the -ve coffecient and 05 represent the voltage level...
in the case of 74 series, the voltage level is applied in between these 2 pins.

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