10 µH, 450 mA — what the ratings mean for the BOM
The LQH32DN100K53L is a 10 µH unshielded wirewound inductor in Murata's LQH32 series, rated for 450 mA continuous current with a maximum DC resistance of 390 mOhm. The 450 mA rating is the DC current at which the inductance typically drops by 10 % due to core saturation — above that, the inductance rolls off, and the ripple current in a buck converter rises. The 390 mOhm DCR sets the I²R loss at full current to about 79 mW, which is well within the 105 °C temperature ceiling of the ferrite core. The self-resonant frequency is 26 MHz, measured at 1 MHz test frequency. For a 10 µH inductor, that SRF is typical of a ferrite-core wirewound in the 1210 package — above 26 MHz the part behaves capacitively, so it should not be used as a filter element near or above that frequency. The unshielded construction means the magnetic field extends outside the body; keep a clearance of at least one part width from adjacent traces carrying sensitive analog signals.
1210 footprint and board integration
The nonstandard package designation means the pad layout follows the 1210 land pattern per IPC-7351B — no special thermal pad or via array is needed. Surface-mount reflow profile follows the standard lead-free profile for ferrite components; the ferrite core is not moisture-sensitive, so no bake is required before reflow.