arduino - Wiring an IR phototransistor - Electrical Engineering Stack Exchange
arduino uno - How do I use a 3 legged phototransistor? - Arduino Stack Exchange
BPX38-3 by ams OSRAM Phototransistors | Avnet
OPL810 Optek, IR Phototransistor, Through Hole 3-Pin TO-18 package | RS
Vishay Intertechnology BPW77NA Phototransistor Silicon Chip, NPN Transistor, Visible Light, 850 nm 3-Pin, 5.5 mm W x 6.15 mm H x 5.5 mm L (Pack of 2): Amazon.com: Industrial & Scientific