What this TPS tantalum brings to a power rail
The TPSE107K016R0055: That ESR figure is the key parameter for a bulk decoupling role — it determines the ripple current capability and the self-heating under AC load, so a 55 mOhm part can handle more ripple than a higher-ESR equivalent without derating.
ESR and temperature — the real selection axes
At 55 mOhm, this capacitor's ESR is low enough for output filtering on a 16 V rail where the switching regulator's ripple current is a few amps. The ±10% tolerance on 100 µF means the actual capacitance at 25°C and 0 V bias sits between 90 µF and 110 µF. Under DC bias, tantalum capacitors lose some capacitance — typically 10–15% at rated voltage — so the effective value on the rail is closer to 85–95 µF. Budget that into your loop compensation or hold-up time calculation.
The surface-mount footprint is standard for this case size — the pad layout in the AVX TPS series application guide calls for a 3.0 mm x 4.4 mm pad per terminal with a 2.0 mm gap between anode and cathode lands. Reflow profile per J-STD-020, peak 260°C.
The TPS series is a standard molded tantalum line, so lead times typically track the broader tantalum capacitor market; confirm current availability at quote time.