[time-nuts] 4046 replacement

Tisha Hayes tisha.hayes at gmail.com
Wed Apr 18 13:00:16 EDT 2018


I too would recommend the  74HCT9046A instead of the 4046.

The data sheet is here;
https://assets.nexperia.com/documents/data-sheet/74HCT9046A.pdf

*Ms. Tisha Hayes*


On Wed, Apr 18, 2018 at 8:27 AM, Bob kb8tq <kb8tq at n1k.org> wrote:

> 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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