CMOS IC help!

Looking for help to find a replacement for the 4063b IC - I have a year 11 pupil who has built a circuit which requires this IC but so far the only thing I can determine is that is either very hard to find or is plain obsolete.

Any help would be appreciated as deadlines draw near.

TIA - befuddled electronics teacher

"David" wrote

year 11

only

Maybe a 74HC85 would do?

Digi-Key has the TI CD4063BE 4-bit magnitude comparator IC, in 16-pin DIP format, for $0.64 each in onesies. They've also got it in 16-pin SOP for the same price.

Mouser has the same part, and also has an ST Microelectronics version for a few pence less.

"btopenworld" suggests that you are in UK.

As you say, they are no longer in the RS or Farnell catalogues.

I have a couple in stock (unused, but condition unknown), which you can have if you email your snailmail address.

If you get stuck....let me know and I will send you some samples from our stock.

David pleaded:

Re the 4063B, it's widely available, and you can get it from ESR for 41p.

ESR are a great little firm. I've no connection with them, but use them often as a customer.

This link will take you right to the 4063B:

An alternative supplier is Grandata - another helpful firm at:

Best of luck with the project!

(David2)

You must take : 74HCTxxx

In all cases there may be problems if the supply voltage is not 5V.

I think some 74C are okay with higher supply voltages but not AFAIK 74HC.

Harold