2.2 µF, 25 V, 7 Ohm ESR — what these ratings mean for your board
The TAJA225K025HNJ: The 25 V rating on a 2.2 µF tantalum in a 1206 case is the first thing to check against your rail voltage — standard practice is to derate by 50 % for DC bias, so this cap is comfortable on a 12 V rail but marginal on a 15 V rail without a higher-voltage part. For a low-ripple decoupling application (e.g., op-amp supply bypass) it is fine; for a switching regulator output filter, check the ripple current against the datasheet's maximum allowed value. If your ambient is lower (say 85°C), the lifetime extends significantly — the 10 °C halving rule applies: every 10 °C below 125 °C roughly doubles the life.
1206 case, molded body, surface-mount
The 1206 (3216 metric) case is a common footprint — 3.20 mm x 1.60 mm, seated height 1.80 mm max. The molded body is standard for the TAJ series, with a tape-and-reel package for automated pick-and-place.