The PZTA42 from Lision Technology is a Bipolar Junction Transistor with Emitter Base Voltage 6 V, Collector Base Voltage 300 V, Collector Emitter Breakdown Voltage 300 V, Collector Emitter Voltage 300 V, Continuous Collector Current 500 mA. Tags: Surface Mount, NPN Transistor. More details for PZTA42 can be seen below.