Magnetic beads have a greater impediment to high-frequency signals only, the general specification of 100 ohms / 100MHZ , it is much smaller than the resistance of the inductor at low frequencies.
Commonly used in power supply filtering HH-1H3216-500 as an example,
Magnetic beads
The meaning of each field of its model number in turn:
HH is one of the series, mainly used for power supply filtering, used for the signal line is the HB series;
1 that a component encapsulated in a magnetic bead, if 4 is four side-by-side encapsulated;
This is the first time that the magnetic beads are used in the signal line.
H denotes the component material, H, C, M for IF application (50-200MHz),
T for low frequency application (50MHz), S for high frequency application (200MHz);
3216 package size, length 3.2mm, width 1.6mm, i.e., 1206 packages;
Note: The unit of the magnetic bead is Ohm, not Henry. This is because the units of a magnetic bead are labeled according to the impedance it produces at a certain frequency, and the units of impedance are also ohms.
Ferrite beads (Ferrite Bead) are a fast-growing anti-jamming component that is cheap, easy to use, and effective in filtering out high-frequency noise. Ferrite beads are also widely used to filter noise from signal cables.
There are three main product parameters:
Impedance [Z]@100MHz (ohm) : Typical 50, Minimum 37;
DC Resistance (m ohm): Maximum 20;
Rated Current (mA) Rated Current (mA): 2500.