The BPW85A from Vishay Intertechnology is a Phototransistor with Collector Emitter Voltage (Breakdown) 70 V, Collector-Dark Current 1 to 200 nA, Collector Emitter Voltage(Saturation) 0.3 V, Emitter Collector Voltage(Breakdown) 5 V, Power Dissipation 100 mW. More details for BPW85A can be seen below.