150 µH shielded drum core — what the ratings mean for the BOM line
The Coilcraft LPS5015-154MRC is a 150 µH shielded drum-core inductor in the LPS5015 series, intended for DC-DC converter output filters and power-supply rail smoothing where the load current stays under 250 mA continuous. The saturation current of 230 mA sets the hard ceiling for peak inductor current before the inductance rolls off — if your converter's peak inductor current exceeds this, the ripple increases and the output voltage may drop out of regulation. With a DCR of 3.4 Ω max, the I²R loss at 250 mA is roughly 0.21 W; in a 5×5×1.5 mm shielded package that heat must be conducted through the PCB copper, so a four-layer board with thermal vias under the part is the typical deployment.
Self-resonant frequency and operating temperature range
The self-resonant frequency (SRF) is 9.3 MHz — above that frequency the inductor behaves capacitively, so this part is suited for switching converters switching below about 2 MHz (the typical rule of thumb is to keep the switching frequency below one-fifth of the SRF).