Item# 4N49>
NPN-Output dc-Input Optocoupler
TAOS ,TSL254R-LF , Photodiode Light to Voltage Converter Sensor SKU: TSL254R-LF Price: $1.99
MOC3030 Optically Coupled Bilateral Switch Zero Crossing Triac SKU: MOC3030 Price: $1.49
MRD300 Transistor, NPN IR Phototransistors SKU: MRD300 Price: $7.25