The Honeywell SDP8436 is an NPN silicon phototransistor encapsulated in a black plastic package, combining the benefits of a side-looking design with the high optical gain of a T-1 package. This phototransistor is specifically engineered for applications demanding extended coupling distances, making it suitable for touch screen technology and scenarios where minimizing crosstalk between adjacent channels is crucial. The package effectively shields against visible ambient light while allowing maximum transmission of infrared energy. It is mechanically matched to the SEP8736 infrared emitting diode, ensuring optimal performance in paired applications.