The TPSY227M010R0150: The 10 V rating gives roughly 2× derating on a 5 V rail — standard practice for tantalum to keep the applied voltage below 60–70% of rated to avoid surge failures.
150 mOhm ESR — ripple current and output noise floor
Equivalent series resistance is 150 mOhm. For a switching regulator output, this ESR sets the ripple voltage magnitude at the switching frequency: lower ESR means less output ripple for the same ripple current. It also governs the capacitor's self-heating under AC load — the 150 mOhm figure keeps the temperature rise within the molded case's dissipation limits for typical decoupling duty.
This covers industrial enclosures, outdoor telecom cabinets, and under-hood automotive ambient where the capacitor sees 105°C soak. The molded TPS series construction supports the full range without the capacitance roll-off that polymer electrolytics show at low temperature.
2917 (7343 Metric) — footprint and height constraint
The Y size code matches the low-profile variant of the TPS series, so it fits under a mezzanine card or in a tight 2 mm clearance above the PCB. Surface-mount assembly with tape-and-reel packaging for automated pick-and-place.