• Reverse mounting SMT LED

    From bitrex@21:1/5 to All on Wed Jul 17 00:37:35 2024
    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.

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  • From Michael Schwingen@21:1/5 to bitrex on Wed Jul 17 09:28:42 2024
    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
    --
    Some people have no respect of age unless it is bottled.

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  • From bitrex@21:1/5 to Michael Schwingen on Wed Jul 17 11:28:14 2024
    On 7/17/2024 5:28 AM, Michael Schwingen wrote:
    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

    Oh that's cool, thank you I'll check those out.

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