10 µH, 620 mA — what the ratings mean for the BOM
The LQH43PB100M26L is a shielded drum-core wirewound inductor from Murata's LQH43 series, rated 10 µH at 1 MHz test frequency with ±20% tolerance. The 620 mA continuous current rating is the DC current the part carries before the inductance drop exceeds the application's margin — the DCR of 176.4 mOhm max sets the copper loss at that current: 0.62² × 0.1764 ≈ 68 mW of self-heating, well within the 125°C ceiling.
Saturation headroom and self-resonant ceiling
The 1.05 A saturation current (Isat) is the point where the ferrite core starts to saturate and inductance drops — 70% headroom above the 620 mA rated current means the inductor holds its value through load transients in a buck converter without the current loop going unstable. The 20 MHz self-resonant frequency (SRF) is the point where the inductor's parasitic capacitance cancels the inductance; above SRF the part behaves capacitively, so keep the switching frequency well below 20 MHz — typically 1–2 MHz for a power inductor of this value.
Shielded construction and board footprint
The ferrite shield keeps the magnetic field contained — no crosstalk into adjacent traces or other inductors in a densely packed 1812 footprint. The 4.50 mm × 3.20 mm body with 2.80 mm seated height fits the standard 1812 (4532 Metric) land pattern; the surface-mount reflow profile follows the standard lead-free solder curve for a ferrite-core part.
Active production — sourcing posture
No pin-compatible second-source is listed, but the 1812 shielded footprint is a common form factor — a parametric search for 10 µH, 620 mA, 1812 yields several drop-in candidates if a hedge is needed.