The BT138B-600E,118 is a part of NXP's BUK (Bottomley Unipolar Kilo-Switches) family of switches. It is a high current, unipolar transistor switch that can control up to 600V. This part is ideal for use in a variety of power applications such as high-side switch-mode power supplies, DC motors, and general purpose switching. This part is available in TO-254 (DPAK) and SOT-223 (SC70) packages.