68 µF, 10 V, 300 mOhm ESR — the C-case TPS tantalum
The 300 mOhm ESR at 100 kHz is the number that drives the ripple current handling and the output ripple voltage in a switching regulator — a 300 mOhm ESR at 1 A ripple produces a 300 mV ripple component, so the downstream load sees that as a voltage excursion.
C case 2312 — footprint and board fit
The C case measures 6.00 mm x 3.20 mm with a seated height of 2.80 mm max.
The ESR will rise at low temperature — expect roughly 2× the 25°C value at -55°C — so the ripple budget needs a cold-start margin.
Active production — no LTB deadline to chase
For a storeroom keeper or a BOM cost engineer, this means the part can be ordered for a running design without an imminent obsolescence risk — but tantalum supply can tighten on short notice, so a multi-year forecast at RFQ is still prudent.