The DTC143TE from FrelTec is a Bipolar Junction Transistor with Emitter Cut off Current 1.9 mA, Collector Base Voltage -50 V, Collector Cut off Current 100 nA, Collector Emitter Breakdown Voltage 50 V, Collector Emitter Voltage 50 V. Tags: Surface Mount, NPN Transistor. More details for DTC143TE can be seen below.