The MMSTA42-7-F from Diodes Incorporated is a Bipolar Junction Transistor with Emitter Base Voltage 6 V, Base Emitter Saturation Voltage 0.9 V, Collector Base Voltage 300 V, Collector Cut off Current 100 nA, Collector Emitter Breakdown Voltage 300 V. Tags: Surface Mount, NPN Transistor. More details for MMSTA42-7-F can be seen below.