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The suffix “30” in the part number KW DELSS2.CC-BXCY-4C6E-46A8-30-R18 denotes the forward current rating, which is typically 30 mA.
The suffix “R18” in OSRAM LED part numbers refers to the packaging format, specifically:
R18 = 180 mm reel diameter used for tape-and-reel packaging.
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Osram LED part numbering - Electromechanical / Optoelectronics - DigiKey TechForum - An Electronic Component and Engineering Solution Forum