The SML-H10TB from ROHM Semiconductor is a Phototransistor with Collector Emitter Voltage (Breakdown) 32 V, Collector-Dark Current 0.5 mA, Collector Emitter Voltage(Saturation) 0.4 V, Emitter Collector Voltage(Breakdown) 5 V, Power Dissipation 80 mW. More details for SML-H10TB can be seen below.