The ES3J part of ON Semiconductor is a bipolar Silicon NPN transistor that is used in a variety of applications, such as switching, amplification, and small-signal power management. It has a maximum collector-emitter voltage of 60V and a maximum current gain of 600. It also has a relatively low power dissipation of 0.8W. This part is commonly used for applications such as line-powered, logic-operated oscillators, switching power supplies, and power transistor arrays.