The ER5025S-300J from Gowanda Electronics is a RF Inductor with Inductance 0.3 uH, DC Resistance 0.13 Ohms, DC Current 0.985 A, Self Resonant Frequency 275 MHz, Operating Temperature -55 to 105 Degree C. Tags: Wire Wound Inductor. More details for ER5025S-300J can be seen below.