TIP3055 npn High voltage transistor by RS components - (Rebranded Texas Instruments item). Package: 3 pin TO-218 (TOP-3) Download Texas Instruments TIP3055 datasheet: Status: NOS (New Old Stock) Circa 1987 RoHS compliant: no for compliant versions see TIP3055 TO-247 case comes complete with mica insulating pad and mounting hole insulating washer ( nice one RS ! )