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I'm designing small PCB(20mm*20mm) where I'm also limited by height of whole project that can't exceed 20mm. I have to place few sensors on the edge of the PCB but not facing up but facing out of the PCB so pads of sensors are perpendicular to the PCB.

Not the real design I haven't designed this part yet but describes what I'd like to do.

My question: What is the usual way this is done?

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I have seen this done by using two PCBs: a smaller one to hold the component is mounted 90° perpendicular to the other one. Pads on the edge of the small board (both sides) soldered to the main PCB are used as support:

PCB illustration

These pads can consist of electrical connections, with additional redundant pads for strength. An alternative would be to use your choice of connector to interface between the two PCBs:

board-to-board connectors

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  • \$\begingroup\$ Sounds good to me but I was hoping to solve it in another way. I'll wait a bit and then accept this answer. \$\endgroup\$ – g_1_k Apr 8 '18 at 7:13
  • \$\begingroup\$ For surface mount components, I'm unsure of another way. \$\endgroup\$ – Daniel Apr 8 '18 at 7:19
  • \$\begingroup\$ @g_1_k added more information. \$\endgroup\$ – Daniel Apr 8 '18 at 7:35
  • \$\begingroup\$ Thanks, I'll try it with SMD on both PCB like the first figure shows, the second option is not available because of lack of space \$\endgroup\$ – g_1_k Apr 8 '18 at 8:17
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How about using these pins and soldering them on both PCBs? Whats wrong with that?

How about

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