Shorter google searches showed that it's an obsolete ROHM part:

http://www.google.com/search?q=2072YKB+led

http://www.oemstrade.com/search/LS-2/

Their part number explanation sheet doesn't include the LS series, but
other parts of the part number may still be usable, which could mean
that it may be a yellow LED with a common cathode connection.

http://www.rohm.com/products/databook/dp/pdf/hinmei.pdf

Given that they don't appear to have data online, you'll have to call
or email ROHM directly for more information.

You will likely find that the pinout probably matches one of their
current models, so that should narrow your search down for determining
your own pinout.  Look for one with a similar form factor and pin
arrangement:

http://www.rohm.com/products/opto_device/led_display/numeric/

The LED characteristics are likely similar to one of the existing
yellow models (if, indeed, yours is yellow).

Chances are good, though, that if you contact them they'll fax or
email you a data sheet for it.


On Mon, Nov 30, 2009 at 11:25 PM, Sean Breheny <shb7@cornell.edu> wrote:
> Hi all,
>
> I have two 7-digit multiplexed LED display modules that I'd like to
> use for a project but I do not know the pinout. I tried some Google
> searches but couldn't find any data. The part is marked
> "LS-2072YKB-93R05" Can anyone point me in the right direction?
>
> Thanks,
>
> Sean
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