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Which pin is pin 1, followup

I

Ignoramus5275

Jan 1, 1970
0
A

Anthony Fremont

Jan 1, 1970
0
I am new to using chips and such, and wanted to double makee sure
which pin is pin 1.

The chip is XR2206PC.

http://igor.chudov.com/tmp/xr2206.jpg

I marked the possibilities with letter A, B, C, D.

It's A. A is pin 1. The semi-circular recessed notch identifies the
Pin 1 end of the chip. AFAIK, the fully circular smooth area on the
lower end of the chip is a manufacturing artifact. I believe it is
where molten plastic is injected to form the case of the chip. It could
also be the vent pipe for the injection moulding process. Some chips
will have a much smaller fully circular dot right next to Pin 1, others
may just have a notch at the end.
 
S

Spehro Pefhany

Jan 1, 1970
0
I am new to using chips and such, and wanted to double makee sure
which pin is pin 1.

The chip is XR2206PC.

http://igor.chudov.com/tmp/xr2206.jpg

I marked the possibilities with letter A, B, C, D.

The datasheet is here

http://igor.chudov.com/projects/Homemade-TIG-DC-to-AC-Inverter/Schematic/XR2206.pdf

I do not want to mess anything up, so I would like to know what is pin
1. I think that it is a pin that I marked with letter A, but I am not
100% sure.

i

Yes, A. BTW, could be wrong, but it looks like pin 8 might be folded
under the chip.



Best regards,
Spehro Pefhany
 
T

Tim Wescott

Jan 1, 1970
0
Ignoramus5275 said:
I am new to using chips and such, and wanted to double makee sure
which pin is pin 1.

The chip is XR2206PC.

http://igor.chudov.com/tmp/xr2206.jpg

I marked the possibilities with letter A, B, C, D.

The datasheet is here

http://igor.chudov.com/projects/Homemade-TIG-DC-to-AC-Inverter/Schematic/XR2206.pdf

I do not want to mess anything up, so I would like to know what is pin
1. I think that it is a pin that I marked with letter A, but I am not
100% sure.

i
Generally if you can't tell by the "official" markings you can align the
chip so the text is right side up -- then pin 1 is in the lower
left-hand corner.

It'll become obvious after a while.
 
I

Ignoramus5275

Jan 1, 1970
0
Thanks gentlemen, I think that I got it now. I was quite sure that it
was pin A, but did not want to mess it up.

i
 
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