Shielded drum core, 3.3 mH — what the ratings mean for the power rail
The Coilcraft LPS6235-335MRC is a shielded drum core inductor in the LPS6235 series, rated 3.3 mH ±20% with a continuous current of 140 mA and a saturation current of 80 mA. The 9.5 Ohm max DCR sets the I²R loss floor — at 140 mA the copper loss is roughly 186 mW, which must be absorbed by the 2424 package's thermal path to the board. The 1.1 MHz self-resonant frequency means this inductor stays inductive well above the switching frequency of a typical 100–500 kHz buck converter, so the core loss from AC ripple does not dominate the thermal budget.
AEC-Q200 and the 125 °C ceiling
Rated AEC-Q200, this inductor is qualified for automotive stress profiles — thermal shock, vibration, and humidity bias per the AEC-Q200 passive-component standard. AEC-Q200 Grade 1 (125 °C) means the part is tested to the full temperature band without derating the current below the 140 mA figure.