The TPMD337K006R0035 is a molded tantalum capacitor from KYOCERA AVX's TPM series, rated 330 µF at 6.3 V with ±10% tolerance. The 35 mOhm ESR is the headline number — it tells you how much ripple current this part can handle before self-heating becomes the limiter. In a buck converter output or a bulk decoupling bank, that low ESR means the cap stays cool under a few amps of ripple, so the 125°C ceiling is reachable without derating. The 2917 (7343 Metric) case is the standard D-size footprint — 7.30 mm x 4.30 mm, seated height 3.10 mm max. It is a surface-mount part, shipped on tape and reel, so it feeds straight into a pick-and-place line. No through-hole hand-soldering on site unless you have a hot-air station and a steady hand.
This cap works in an avionics power rail that sees -40°C at altitude, an engine-bay ECU that bakes at 105°C on a summer grade, or a downhole tool that cycles from surface heat to formation cold. The molded case is sealed, so it handles condensation cycles better than a dipped part. No conformal-coat gotcha, but the pad layout needs a clean reflow profile — the 35 mOhm ESR means it draws current, so the solder joint sees thermal cycling.
This is a current catalog item from KYOCERA AVX.