The 678D398M6R3EK4D from Barker Microfarads is a Power Capacitor with Capacitance 3900 µF, Voltage Rating 6.3 V, Equivalent Series Resistance (ESR) 0.041 to 0.110 Ohm, Operating Temperature -55 to 105 Degree C. Tags: Through Hole, Polymer Capacitor. More details for 678D398M6R3EK4D can be seen below.