680 µF bulk cap for a 4 V rail — what the ratings mean
The TAJY687M004RNJ: At 680 µF and 4 V, this TAJ-series molded tantalum stores enough charge to smooth a 4 V supply rail through a 100 mA load transient without dropping below regulation — the 200 mOhm ESR limits the voltage step during the current surge.
The surface-mount footprint matches standard tantalum capacitor pads for this case size — no special via-in-pad or thermal relief required.
