Hi Cornec,
There isn't much more for me to say as I was not here 7-10 years ago. And if I was I am not on the manufacturing team.
I have checked the data codes for you as commented earlier and these are legitimate devices.
Part Number: SN74LS08 Other Parts Discussed in Thread: SN74AHCT08 SN74LS08D When the input pin is floating and there is no input level, the output pin is high level, and the voltage of the input pin is measured to be 1.3V. What is the cause at this time…
Part Number: SN74LS08 FOR THE PART NUMBER "SN74LS08NSR" THE MENTIONED PACKAGE IS "NS" AS PER DATASHEET BUT THERE IS NO SYMBOL REPRESENTATION FOR THE "NS" PACKAGE OTHER THAN THIS ALL OTHER PACKAGES WERE MENTIONED ABOVE THE SYMBOL IN FIRST PAGE OF THE DATASHEET…
Other Parts Discussed in Thread: SN74LS08 Hi team,
Customer would like to know what's the output status when chip failure happened at SN74LS08?
How to predict this if possible?
Maybe we can try to add a pull-up/down resistor(or other steps) to get…
Why? If you need to handle TTL signals, you can use CMOS devices with TTL-compatible inputs.
TTL:
SN74LS14, SN7414 SN74ALS04B, SN74LS04, SN7404 SN74ALS32, SN74LS32, SN7432 SN74ALS08, SN74LS08 SN74ALS165, SN74LS165A
TTL compatible:
SN74AHCT14, SN74HCT14 SN74AHCT04…