The WSF10D40-4R7YQ from AiT Semiconductor is a Power Inductor with Inductance 4.70 µH, Inductance Tolerance ±30 %, DCR 21.0 mOhm, Saturation Current 5.70 A, Temperature Operating Range -40 to 125 Degree C. Tags: Surface Mount. More details for WSF10D40-4R7YQ can be seen below.