Optocouplers SMD EL817S1 SOP-4

From the shop's description

Brand: Everlight Electronics Voltage – Isolation: 5000Vrms Current Transfer Ratio (Max): 160% @ 5mA Current Transfer Ratio (Min): 80% @ 5mA Number of Channels: 1 Input Type: DC Rise / Fall Time (Typ): 4us / 3us Voltage – Forward (Vf) (Typ): 1.2V Voltage – Output (Max): 35V Current – DC Forward (If) (Max): 60mA Current – Output / Channel: 50mA Output Type: Transistor Operating Temperature: -55C ~ 110C Vce Saturation (Max): 200mV Package: 4-SMD Mounting Type: Surface Mount