Counting pins on IC?

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kyroguy

Joined May 12, 2010
77
Struggling with a project and trouble shooting any small mistakes I may have made along the way. Anyway, I come to the realization that I may have the IC in backwards. I have always counted the pins counterclockwise from the dot or notch on the IC. Pin 1 in upper left and pin 14 in the upper right. Anyway, I start looking at my cd40106b and realize that there is a notch on one end and a dot on the other! Which end do you count from then?

http://monsterminibow.com/nowoodchips2

In the picture you can see the opposite ends of the chip and their markings. I just can't figure out what I'm doing wrong! Every time I try to same money by making it myself, this is what happens...
 

Ghar

Joined Mar 8, 2010
655
I always check the datasheet for the orientation. It's generally not a big deal because you need to look at the datasheet for the pinout anyway.

The notch is the marking, that dot is a byproduct of manufacturing the plastic case.
If there's a dot it would be a circular indentation or a printed dot.
Remember that machines need to sense the direction so it will either be very obvious visually or mechanically.
 
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