The TAJA154M035RNJ: That military-temperature band means it holds tolerance through thermal cycling in avionics, downhole instrumentation, or satellite power buses — environments where a commercial-grade cap would drift or fail. At 0.15 µF and 35 V, it fits decoupling roles on 12 V or 24 V rails where the 35 V rating gives derating headroom against transients.
21 Ohm ESR is on the higher side for a tantalum cap of this value. That limits ripple current capability — check the power dissipation against your load's AC content. In a low-impedance decoupling spot (e.g., near an MCU), the ESR actually helps damp ringing. The 1206 package (3.20 mm x 1.60 mm) is a standard reflow-friendly footprint. It hand-solders easily and is inspectable under magnification. The seated height is 1.80 mm max — fine for most board stack-ups.