I have a part that looks like this under my microscope:

enter image description here

and it is a TPS22810 load switch (datasheet). But, how do I know which side is which?

  • \$\begingroup\$ According to page 3, there is a dot, or an indentation above pin 1. Can you see or feel one? \$\endgroup\$
    – CrossRoads
    Feb 7, 2019 at 18:26
  • \$\begingroup\$ Feel? I can barely feel the part :-D And not even under the microscope I can see something, see picture... \$\endgroup\$ Feb 7, 2019 at 18:27
  • \$\begingroup\$ You might also be able to measure the body diode in the MOSFET between pins 1 and 6 (the 2 end pins), see page 15. \$\endgroup\$
    – CrossRoads
    Feb 7, 2019 at 18:31
  • 3
    \$\begingroup\$ Usually when you orient the component so that you're looking at the top of it with the text right-side up, pin 1 is in the bottom left-hand corner. \$\endgroup\$
    – DerStrom8
    Feb 7, 2019 at 18:33
  • 1
    \$\begingroup\$ Yes. From 6 to 1. \$\endgroup\$
    – CrossRoads
    Feb 7, 2019 at 18:33

1 Answer 1


The vertical bar on the left hand side of the part indicates the orientation. Therefore the pin 1 is located on the bottom left corner, and the pin 3 in the bottom right corner.

The text is always readable when the pin 1 is on the bottom left corner

The sequence is as follows:

6 5 4

1 2 3

  • \$\begingroup\$ Thank you! Why don't they write that as-is in the diagram? :-D \$\endgroup\$ Feb 7, 2019 at 18:34
  • \$\begingroup\$ "The text is always readable when the pin 1 is on the bottom left corner" just wanted to point out that this isn't true for all parts, just in case people thought it was \$\endgroup\$
    – BeB00
    Feb 7, 2019 at 22:11

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