The TAJW686M004RNJ is a molded tantalum capacitor from the KYOCERA AVX TAJ series, rated 68 µF at 4 V with ±20% tolerance. Its 400 mOhm ESR keeps ripple heating under control in DC-DC output filters or bulk decoupling on 3.3 V and lower rails.
Package and board-fit details
Housed in a 2312 (6032 Metric) molded case, size code W, with seated height 1.5 mm max — low-profile enough for tight mezzanine stacking. Surface-mount package ships on tape and reel, the standard format for pick-and-place assembly.