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USBLC6-2SC6 - Is it possible to connect pins 1 + 6 (and 3 + 4) on the PCB?
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Tarik:
Hello,

I'm designing a board for hand soldering and would like to use the USBLC6-2SC6 as ESD protection.
Its speed is not really needed on an Arduino board, but it might help make SDA/SCL more reliable.
Footprint is SOT23-6.
Although I got soldered it manually, I'm afraid it's not everyone's cup of tea or will scare others off.
For this reason I would like to make the use of USBLC6 optional.
The footprint will be on the board of course, but the signal lines are broken and it won't work
I see 2 ways to make it optional but functional:

1) Connect pin 1 and pin 6 on the board (3 and 4 also)
This would give the option to start without ESD protection, but can be installed at any time / subsequently without further changes.
It should not be a big deal, since these pins are connected internally anyway.
I just haven't seen this in any example yet
or
2) Add a solder bridge if one does not want the adventure of USBLC6-2SC6

What do you think?
Tarik
(USBLC6 Symbol attached)
ataradov:
What solder bridge do you want to add? All ESD protection devices can be removed without affecting functionality of the board.

Show the schematic you are planning on using.
Tarik:
Yes, of course.
Please have a look at the attached picture.
As soon as I don't apply the protection circuit, the connection for the SCL line (as well as for SDA) will be interrupted, unless you take further precautions (In the picture: the solder bridges).
ataradov:
This is not how this works. 1+6 and 3+4 are internally shorted and should be externally shorted permanently. There is no protected and unprotected side. This is not a pass-though device, it just clamps excess voltage on the data lines to the power rails.

The reason to have this arrangement of pins is to simplify the layout and because extra pins are available on the package.
Tarik:
I fully agree - this is also my "Variant 1" solution.
The only thing that made me doubt it is that I did not see that it is not drawn that way in the datasheet.
I have changed the scheme (see below) according to the advice.

Thank you for your quick help and advice!

Tarik
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