Identify pin 1 without any markings?

[halleffector]

Consider this IC: https://ae01.alicdn.com/kf/HTB1r5KtIFXXXXadXFXXq6xXFXXXT/-font-b-L6561D-b-font-.jpg

Where is pin 1? There is no notch or making on the IC, how are you supposed to know where pin 1 is? Should you use the text as an orientation guide? If so, where is pin 1 in relation to the text?

 

[jpanhalt]

A datasheet would be helpful. I suspect the chip looks like this:

The shaded area is not colored, but rather, it is more beveled. Both sides will have some bevel, but the #1 pin is on the side with more bevel. This example is the LTC15601.

Recheck the datasheet for your device. You will probably see some indication for a bevel. If not, please post a link to its datasheet.
John

 

[ericgibbs]

hi,
As John's image shows the chamfer, photo shopping your image shows the chamfer.
E

 

[jpanhalt]

And, if it is the L6561 from ST, here is its datasheet for the SO8:

John