100 µF, 25 V, 400 mOhm ESR — bulk decoupling for 12 V rails
The TAJV107K025RNJ: This is a molded tantalum capacitor in the TAJ series, rated 100 µF at 25 V with a ±10% tolerance and 400 mOhm ESR. The 25 V rating gives headroom on a 12 V bus or a 5 V rail with margin for transients. The ESR figure is the one that matters for ripple current handling — 400 mOhm means it can absorb a few hundred mA of ripple before self-heating becomes a concern.
The molded construction keeps the element protected from moisture and mechanical stress across that range.