The TAJR155M006RNJ is a molded tantalum capacitor from the TAJ family, rated 1.5 µF at 6.3 V with a ±20% tolerance. The 0805 case (2.05 mm × 1.30 mm footprint) fits tight board layouts where a 1206 or larger part won't squeeze in. The 2 Ohm ESR is the key thermal parameter: it sets the ripple current the part can handle before self-heating shifts the capacitance. For a 100 kHz buck converter output, the ripple current squared times ESR gives the internal temperature rise — keep that under the 125 °C absolute ceiling.
This part can sit on an avionics power supply board that sees -40 °C at altitude and +105 °C on the tarmac without leaving its rated envelope. No derating needed down to -55 °C, which matters for satellite or downhole equipment where the cold end is the real limit.
No last-time-buy deadline, no NRND flag — it is a current-production choice for new designs.