Optical Sensors - Phototransistors definition: An optical sensor converts light rays into electronic signals. It measures the physical quantity of light and then translates it into a form... Optical Sensors - Phototransistors Product Listing: SFH310FA,BPX434.Sensors, Transducers type:Pressure Sensors, Transducers(84536),Current Sensors(57379),Encoders(27450),Proximity Sensors(21296),Sensor Cable - Assemblies(20019) .Optical Sensors - Phototransistors has 2 pieces of spot stock price information, you can click the "RFQ" button to confirm the inventory and price with the MOST.