74 Hc-hct Series

[rpone_99]

What is the difference between the 74HC00 and the 74HCT00?

[skinerd]

Not enough to matter, I have use both. The "T" in the part number is for transistor to transistor.....

[rpone_99]

Thanks, I did a little digging and found this on an IC site

The 74HC00 (high speed CMOS (http://www.fairchildsemi.com/products/logic/catalog/hc.html)) is faster than the LS uses much less power but has slightly different logic thresholds so should not be used with 74 or 74LS series chips.
The 74HCT00 (high speed CMOS, TTL compatible (http://www.fairchildsemi.com/products/logic/catalog/hct.html)) is designed to be used with the both the old logic 74 and 74LS series and the new 74HC series.