MJE13007G Bipolar (BJT) Single Transistor, General Purpose, NPN, 400 V, 14 MHz. The MJE13007G is a Silicon NPN Bipolar Power Transistor designed for high voltage and high speed power switching inductive circuits where fall time is critical. It is particularly suited for 115 and 220V switch mode applications such as switching regulators, inverters, motor controls, solenoid/relay drivers and deflection circuits.