What this TAJ tantalum capacitor does on your board
The TAJA684K035K is a molded tantalum capacitor from KYOCERA AVX's TAJ series, rated 0.68 µF at 35 V with ±10% tolerance. The 8 Ω ESR (Equivalent Series Resistance) sets the self-heating and ripple-current ceiling — at this ESR, the capacitor is suited for decoupling and filtering where low impedance at high frequencies is not the primary demand. Full military temperature range (-55 to 125 °C) means it holds capacitance and leakage across avionics bay, satellite bus, or downhole logging tool ambient swings. The 1206 (3216 Metric) case with A-size code fits standard pick-and-place and reflow profiles.
Design-in checklist for the 1206 case
The 1206 (3216 Metric) footprint is standard — pad dimensions follow the IPC-7351B nominal land pattern. The 1.80 mm seated height keeps it below low-profile components. Tape & Reel (TR) packaging suits automated assembly; no moisture sensitivity level (MSL) is listed, but standard tantalum handling (bake at 125 °C if exposed beyond 48 hours) applies.