2.2 µF, 35 V, 1.5 Ohm ESR — decoupling a 35 V rail
The TPSA225K035R1500: This is a Molded tantalum capacitor from the TPS series, rated 2.2 µF at 35 V with ±10% tolerance and 1.5 Ohm ESR. The 1.5 Ohm ESR sets the ripple current capability — for a 100 kHz switching regulator output, the capacitor's self-heating stays manageable below 200 mA RMS ripple, which covers most point-of-load decoupling on a 35 V bus.
Military temperature range — avionics and downhole fit
It suits avionics power supplies that see -55 °C cold-soak, downhole instrumentation at 125 °C, and satellite payloads where the thermal cycle spans the entire range. The 1206 case keeps the board footprint small while the molded construction resists moisture ingress better than uncoated chips.