33 µF, 35 V, D-case — bulk decoupling for a 24 V rail
The TPSD336K035H0200: It belongs to KYOCERA AVX's TPS series, which is a general-purpose range for surface-mount designs where volumetric efficiency matters more than the ultra-low ESR of specialty polymer parts. On a 12 V rail the margin is generous enough that the capacitor sees almost no voltage stress.
200 mOhm ESR — what it means for ripple and self-heating
The 200 mOhm ESR (Equivalent Series Resistance) is the figure that governs ripple current capability and self-heating in this can size. At 100 kHz, the impedance is dominated by the ESR, so the ripple current rating is roughly sqrt(P_max / ESR) — a 200 mOhm part in a D-case typically handles 0.5 A to 0.8 A ripple before internal temperature rise forces derating. For a buck converter output running at 500 kHz, the capacitor sees the inductor ripple current. If the ripple is 0.6 A peak-to-peak, the RMS ripple is about 0.17 A — well within the D-case's capability at 85°C ambient. At 105°C the ripple must be derated per the manufacturer's curve; the 125°C upper limit is the absolute ceiling, not a continuous operating point.
Active production — no redesign pressure
There is no end-of-life notice, no last-time-buy window, and no forced redesign on the horizon. For a BOM that already qualifies this D-case footprint and ESR class, the part is a stable line item. The molded case and standard 2917 footprint mean it reflows with the same profile as other passive components on the board.