[sdiy] 74HC165 vs CD4021..

[Tom Wiltshire]

I can't speak to the reliability question, but I'd choose the far-more-modern and more-available 74HC part over the ancient-history 4000-series CMOS.

There are often other related questions to your choice of logic. The '165 has a useful sidekick in the '166, and both of them have serial-to-parallel cousins in the 74HC594 and '595. I don't think there's so many options for the 400-series chips. 

I learned about logic circuit using 400-series circuits and a 9V battery on my breadboard about 40 years ago. They must have come up with something better since then, right?!?


> On 14 Oct 2022, at 17:48, Jean-Pierre Desrochers <jpdesroc at oricom.ca> wrote:
> 
> I’m about to use 11 x  8bits parallel in to serial out shift registers for a project.
> So far my choice would be between 74HC165 vs CD4021..
> any suggestions ?
> I read over the past that HC series was sturdier than CD series for longevity/reliability.. 😉
> Your opinion on that.. ?
> Thanks.
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