100 µF bulk cap for 10 V rails — ESR and derating
The TAJY107K010RNJ: Rated 100 µF at 10 V with ±10% tolerance — the 10 V rating gives about 20 % derating headroom on a 5 V rail, but on a 10 V rail the margin is thin; expect capacitance loss at temperature and bias per the tantalum voltage-derating curve. 900 mOhm ESR at 25°C sets the ripple current ceiling — for a 100 kHz buck output, that ESR contributes roughly 90 mV of ripple per amp of AC current; the self-heating from ripple current raises the internal temperature, so the 125°C rating assumes the ambient plus self-heating stays under the limit.
Lifecycle — active production, no obsolescence watch
RoHS compliant per the standard TAJ series material declaration — no exemption claim needed for this order code.
2917 footprint — layout and rework notes
2917 (7343 Metric) case, size code Y — 7.30 x 4.30 mm body, 2.00 mm seated height. The anode (+) is the chamfered end; the cathode (−) is the full-width termination on the opposite side. Standard land pattern: 3.1 mm pad width, 2.5 mm pad-to-pad gap, 4.6 mm pad length — the exact IPC-7351 footprint is in the TAJ series application note. Molded epoxy case with a flat top — rework with hot air at 260°C peak for 10 seconds per JEDEC MSL 1; no pre-bake required if the reel seal is intact.