[time-nuts] 4046 replacement

Bob kb8tq kb8tq at n1k.org
Wed Apr 18 09:27:20 EDT 2018


Hi

If this is a new build, why use a 4046 in the first place? There are many newer parts
that will do all sorts of things. If this is a repair of something that has been running
for years, is it > 5V supply to the chips? If so, you are pretty much stuck with 4000
series CMOS.

There are no fatal flaws in the 4046, but there are basic design limitations. Those
have been well documented over the years and here on the list. Going to a better
part is the answer for that stuff ( = get away from  any xxxx4046 IC).

Bob

> On Apr 18, 2018, at 4:04 AM, donald collie <donaldbcollie at gmail.com> wrote:
> 
> I have 4  frequency synthesiser projects, each using HEF4046BCN`s, but have
> recently read that this CMOS IC has a design flaw. What would be a better
> chip to retrofit? I`m thinking perhaps a HEF74HC4046AN [that`s if it
> doesn`t have the same bug], or a 74HC7046AN - which is similar. Both these
> chips are more-or-less pin compatable TIA for any
> advice!.......................................................................................................Don
> 
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