Phototransistors are light-sensitive devices and are a combination of photodiode-amplifier. They are light detectors with internal gain and are employed to provide analog or digital signals. Potential applications of Honeywell phototransistors include printers and copiers, motion control systems, metering systems, liquid-level sensing, data storage systems, scanning, automated transaction, drop sensors, and other noninvasive medical equipment.

SD1440-004L Phototransistor from Honeywell comes in a compact, metal can coaxial package. This Infrared Emitting Diode has a wide sensitivity range and a 24 ° acceptance angle. It is mechanically and spectrally matched to SE1450 and SE1470 infrared emitting diodes. This Honeywell Photosensor also has a wide operating temperature range of -55 °C to 125 °C [-67 °F to 257 °F].