2.2 µF at 16 V — the decoupling decision
The TPST225K016R2000: The 2 Ohm ESR means this part handles moderate ripple current in power rail decoupling or signal filtering — the series resistance limits the AC ripple the capacitor can absorb before self-heating becomes a concern. The ±10% tolerance is tight enough for most bypass and bulk storage roles; a looser ±20% grade would save cost if the exact value is non-critical.
Temperature range and deployment
The molded construction gives the capacitor a sealed body that resists moisture ingress better than uncoated tantalum chips — relevant if the board sees condensation or conformal coating.