The 30LR397M040EF2A from Barker Microfarads is a Power Capacitor with Capacitance 390 µF, Voltage Rating 40 V, Equivalent Series Resistance (ESR) 0.15 Ohm, Operating Temperature -40 to 105 Degree C. Tags: Through Hole, Polymer Capacitor. More details for 30LR397M040EF2A can be seen below.