The 0603AF-391XJR_ from Coilcraft is a RF Inductor with Inductance 0.391 µH, DC Resistance 0.30 Ohms, DC Current 0.64 A(Irms), Self Resonant Frequency 700 MHz, Operating Temperature -40 to 85 Degree C. Tags: Chip Inductor, Wire Wound Inductor. More details for 0603AF-391XJR_ can be seen below.