HEF40138

Sure it's not a 4013B Dual D flip flop ??

Alan

snipped-for-privacy@netscape.net schrieb:

Hi,

this is probably an HEF4013B - an ubiquitous CMOS dual D-type flip-flop.

By the way, HEF is a "Pro Electron" designation, and thus not necessarily indicative of a particular manufacturer. Pro Electron was (?is) an association created by electron tube and semiconductor device manufacturers to administer the allocation of standardized type designations.

According to their scheme, the first to letters "HE" designate the digital family (CMOS with Vcc from 3 to 18V), and the third letter "F" designates an operating ambient temperature range (-40 to +85 degrees centigrade).

Martin.

hi glenn, most likely HEF4013B

Thank you to all those that replied (and those that sent email replies). After careful rexamination (the printing was a bit smudged) I've concluded that it is in fact a 'B' and not an '8'. It's a 14 pin package, as is the 4013B. A D flop doesn't make a lot of sense where it is but hopefully it will become clear once I track out the connections. BTW, there does seem to be a 40138 as I found a couple of places that sold it, though they didn't ever identify it, except by number. So just for curiosities sake, anyone know what a 40138 is? Thank you all again for the help.