The TPSA106K010R0900 is a molded tantalum capacitor from KYOCERA AVX's TPS series, rated 10 µF at 10 V with ±10% tolerance. The 900 mOhm ESR is the dominant loss term at switching frequencies — it sets the ripple voltage and self-heating budget for the decoupling or filtering node. For a 3.3 V rail, the 10 V rating provides over 50% derating margin, which is standard practice to avoid inrush failure in tantalum capacitors.
The 1206 (3216 Metric) case with a seated height of 1.80 mm fits tight board stacks in compact enclosures.