1000 µF at 2.5 V — bulk decoupling for low-voltage rails
The TPSE108K002R0030: That capacitance density suits it for bulk decoupling on sub-3 V supply rails where board space is tight and the ripple current is moderate.
30 mOhm ESR — what it means for ripple and thermal budget
The 30 mOhm equivalent series resistance (ESR) is the figure that governs the capacitor's self-heating under ripple current. For a given ripple current I, the power dissipated is I² × ESR — a 30 mOhm ESR keeps the internal temperature rise lower than a higher-ESR part would at the same ripple, which directly affects reliability in a power supply output filter or a DC-DC converter input stage. The ±10% tolerance on the 1000 µF nominal capacitance means the actual value at 25 °C and rated voltage sits between 900 µF and 1100 µF. That spread is typical for tantalum electrolytics and is fine for bulk decoupling; for timing or filter poles, the tolerance needs to be factored into the design margin. The operating temperature range of -55°C to 125°C covers military and industrial environments. Tantalum capacitors exhibit capacitance drop at low temperature and increased leakage at high temperature, but the TPS series is rated across this full band without derating below 2.5 V.