The B72207S0421K101 is a part manufactured by TDK, a global electronics manufacturer. This part is part of their B722 Series power inductors. It is a ferrite core power inductor with a rated current of 4.2A, a net inductance of 10µH, and a maximum DC resistance of 0.072 ohms. It has an operable temperature range between -25 and +85 Celsius, and it’s rated for a maximum voltage of 25V. The parts dimensions are 7.2x7.2x4.2 mm.