The PTF080D3 from Optrans America is a Phototransistor with Collector Emitter Voltage (Breakdown) 30 V, Collector-Dark Current 100 nA, Collector Emitter Voltage(Saturation) 0.2 V, Emitter Collector Voltage(Breakdown) 5 V, Power Dissipation 200 mW. More details for PTF080D3 can be seen below.