The TAJB334M050RNJ: This is a 0.33 µF capacitor rated at 50 V DC, ±20% tolerance.
If your board sees engine-bay heat or a satellite thermal cycle, this cap stays within spec.
ESR — what 12 ohms means on the board
12 ohm ESR is on the high side for a 0.33 µF tantalum at 50 V. In a power-supply output filter, that ESR adds ripple voltage under load — the voltage ripple is I_load × ESR.
1411 (3528 Metric) / 1210 case, size code B. The footprint is 3.50 mm x 2.80 mm, seated height 2.10 mm max. This is a common tantalum footprint — if your board already has a 1210 tantalum pad, this drops in without a layout change.
The TAJ series is a KYOCERA AVX workhorse, widely available through independent distribution.