PT481 Series PhototransistorsThe PT481 family, from Sharp, are a family of narrow acceptance phototransistors. They are in side looking (SL) epoxy resin packages with a domed lens on the side of the package. The PT481F devices have a black plastic package which offers a daylight blocking filter while the PT481 has a clear lens for visible and near IR radiation.Features of the PT481 phototransistors: Side looking (SL) packageThrough-hole mountingClear or black plastic packageIR Phototransistors, Sharp