220 µF, 16 V — bulk decoupling for 12 V rails
This is a standard bulk-decoupling value for a 12 V power rail — the 16 V rating gives 33% derating margin, which is the common practice for tantalum reliability in a 12 V system. The 500 mOhm ESR is moderate for a 220 µF tantalum at this voltage. In a DC-DC converter output, that ESR sets the ripple voltage at the switching frequency; for a 1 A ripple current, expect 500 mV of ripple. If lower ripple is needed, a polymer or ceramic alternative would be a better fit.
This capacitor can sit in an avionics black box that sees -55°C cold soak on the tarmac and 125°C near an engine bleed-air duct. The molded case handles the thermal cycling without cracking the dielectric. The 2917 (7343 Metric) package is a standard large-case tantalum footprint. The size code E body measures 7.30 mm x 4.30 mm with a seated height of 4.30 mm. This footprint matches the common 2917 land pattern used across multiple manufacturers, so board layout is straightforward.
This part is still in regular production and can be ordered through distribution against a BOM line without lifecycle risk. The part ships on tape and reel, which is the standard delivery format for automated pick-and-place assembly.