CTR: 100...600 %. Diode IF: 50mA. Courant IF Diode (peak): 1A. Diode threshold voltage: 1.15V. Function: GaAs Ired & Photo-Transistor. Collector current: 50mA. Ic(pulse): 1A. Marking on the case: P181G. Output: transistor output. Pd (Power Dissipation, Max): 150mW. RoHS: yes. Assembly/installation: surface-mounted component (SMD). Tf (type): 3us. Housing: SO-4. Housing (according to data sheet): 11-4C1. Tr: 2us. Operating temperature: -55...+100°C. Saturation voltage VCE(sat): 0.2V. Collector/emitter voltage Vceo: 80V. VECO: 7V. VRRM: 3750V. Number of terminals: 4. Spec info: AC-DC Input, AC Adapter, I/O Interface Board