4.7 µF at 20 V — what it covers
The TAJC475M020SNJ: This is a 4.7 µF molded tantalum capacitor rated for 20 V continuous. In a 12 V rail, that gives you 8 V of headroom — enough to handle a 5% overvoltage transient without pushing the part into derating territory.
The molded case handles the thermal cycling without cracking the dielectric — a common failure mode in conformally-coated tantalums used outdoors.
Package — 2312 (6032 Metric), size code C
The 2312 case (6.00 mm x 3.20 mm footprint, 2.80 mm seated height) is a standard size for tantalum chip caps. The size code C tells you the can volume — useful when you are swapping in a replacement and need the same mechanical fit in the pick-and-place reel.