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I've received chips PCA9306DCTR (from Texas Instruments) but they don't have any dot or notch to define it's orientation (i.e. where is the pin 1).

In the datasheet there is a picture of this chip (in SM8 package) and it has a notch. However chips I've received has only strip of different color (please see the picture) and I've not found any information about it's meaning.

enter image description here

So, is this strip mark pins GND and EN (i.e. the same as dot or notch) or it marks SDA1 and SDA2?

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  • \$\begingroup\$ I would bet it mark GND-EN, but, yes it's just a bet... \$\endgroup\$ – Felice Pollano May 6 '13 at 17:49
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The stripe marks the Pin 1 end. With Pin 1 to the left, the rest of the text is right way up, as further confirmation - as has been the convention on all DIP ICs (and SOIC) I have ever seen.

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I think that the prints on it are the key: for read the code "7bd 23y" you have to put it over your table in a certain way. And then the pin 1 will be the lower left one.

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So just what is the inked square on the corner. Looks like a pin one marker to me.

enter image description here

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  • \$\begingroup\$ It's just a reflection of light (chip is very small, so I zoomed image a lot). But anyway thanks for you reply! \$\endgroup\$ – Oleg May 6 '13 at 20:26

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