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Identify pin 1 without any markings?

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jpanhalt

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A datasheet would be helpful. I suspect the chip looks like this:
upload_2017-6-20_10-58-20.png

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.

upload_2017-6-20_11-1-16.png

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

Well-Known Member
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hi,
As John's image shows the chamfer, photo shopping your image shows the chamfer.
E
-font-b-L6561D-b-font-.jpg
 

jpanhalt

Well-Known Member
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And, if it is the L6561 from ST, here is its datasheet for the SO8:

upload_2017-6-20_11-37-42.png


John
 
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