The 0603AF-421XJR_ from Coilcraft is a RF Inductor with Inductance 0.42 µH, DC Resistance 0.33 Ohms, DC Current 0.61 A(Irms), Self Resonant Frequency 690 MHz, Operating Temperature -40 to 85 Degree C. Tags: Chip Inductor, Wire Wound Inductor. More details for 0603AF-421XJR_ can be seen below.