Molded tantalum, 2.2 µF at 50 V — D case, 2917 footprint
The TAJD225K050RNJ: This is a KYOCERA AVX TAJ series molded tantalum capacitor, 2.2 µF capacitance rated at 50 V with ±10% tolerance. The D case size (2917 / 7343 metric) is a common footprint for power-supply decoupling and hold-up capacitors on 12 V, 24 V, and 48 V rails. The 2.5 Ohm ESR sets a practical ripple current ceiling — at 100 kHz, the self-heating from ripple current through that ESR limits the usable AC component to roughly 400 mA RMS before the internal temperature rise cuts into the 125°C rating.
The molded case and surface-mount 2917 package keep the part stable under thermal cycling — the D case's 3.1 mm seated height fits standard board-to-board spacing.
The TAJ series is a long-running molded tantalum family with broad distributor coverage.