I'm designing an evaluation board where I'd like to have the lower cost
of single-sided assembly, but mount a couple LEDs such that they fire
through the PCB, so they're visible from the non-component side.
Is there a way to accomplish this or particular parts to use that most
PCB assembly houses would support? Either a physical hole in the board
or just a hole in the solder mask (this is a two-sided board so it
should be thin enough for the light to diffuse through) would work for
me, but I'm unsure which would be better from an assembly perspective.
On 2024-07-17, bitrex <user@example.net> wrote:
I'm designing an evaluation board where I'd like to have the lower cost
of single-sided assembly, but mount a couple LEDs such that they fire
through the PCB, so they're visible from the non-component side.
Is there a way to accomplish this or particular parts to use that most
PCB assembly houses would support? Either a physical hole in the board
or just a hole in the solder mask (this is a two-sided board so it
should be thin enough for the light to diffuse through) would work for
me, but I'm unsure which would be better from an assembly perspective.
There are reverse-mount SMD LEDs just for that purpose - usually, they are mounted on a hole in the PCB:
https://www.we-online.com/en/components/products/WL-SMRW https://ams-osram.com/products/leds/multi-color-leds/osram-multi-topled-reverse-gullwing-log-t77k
https://ams-osram.com/products/leds/color-leds/osram-pointled-lb-p4sg
I have seen them used on telephone PCBs with single-sided assembly.
cu
Michael
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