220 µF bulk cap with 100 mOhm ESR for rail decoupling
The TPSE227K010R0100: The 100 mOhm ESR means this part handles ripple current with lower self-heating than a standard tantalum — relevant when the capacitor sits on a switching regulator output where ripple current generates I²R losses in the dielectric. That is a standard tantalum outline that fits existing 2917 land patterns without a layout change.
ESR and temperature range for power rail filtering
Lower ESR means less voltage ripple under transient load and lower internal temperature rise. For a 1 A ripple current, the power dissipation is I²R = 0.1 W — well within the part's thermal budget at 125 °C ambient. At the high end, the leakage current and ESR both increase — the 10 V rating provides derating margin when the rail is 5 V or lower, which is standard practice for tantalum capacitors to avoid surge failures. Molded construction gives the part mechanical protection during reflow and handling, unlike conformal-coated tantalums that are more sensitive to board flex. The TPS series is positioned as a general-purpose low-ESR tantalum line.