The JMK212BC6226MG-T: The X6S temperature coefficient caps the capacitance change at ±20% across the full -55 to 105 °C operating window. For an SMPS input or output filter, this means the ripple-current-handling contribution stays predictable across the thermal cycle — no surprises as the supply warms up under load.
0805 SMT MLCC in an SMPS filter role
The 2.00 mm × 1.25 mm body fits the standard 0805 pad pattern, and the 1.35 mm max thickness is the standard profile for this case size — board layout and thermal relief on the pad rather than the component height is what constrains high-current SMPS filter sections. The 6.3 V rating positions this part for input or output filtering on 5 V rails; it is not sized for 12 V or 24 V input-stage bulk roles.