The NTE3120 from NTE Electronics, Inc is a Phototransistor with Collector Emitter Voltage (Breakdown) 20 V, Collector-Dark Current 0.01 to 1 uA, Collector Emitter Voltage(Saturation) 1 V, Emitter Collector Voltage(Breakdown) 5 V, On-State Collector Current 1 to 3 mA. More details for NTE3120 can be seen below.