1. Inductors are energy storage components, while magnetic beads are energy conversion (consumption) devices.
2. Inductors are mostly used for power filter circuits, and magnetic beads are mostly used for signal circuits for EMC countermeasures.
3. Magnetic beads are mainly used to suppress electromagnetic radiation interference, while inductors are used in this regard to focus on suppressing conductive interference. Both can be used to deal with EMC, EMI issues.
Two ways of EMI, namely: radiation and conduction, different ways using different suppression methods. The former uses magnetic beads, the latter uses inductors.
4. Magnetic beads are used to absorb ultra-high frequency signals, such as some RF circuits, PLL, oscillation circuits, and ultra-high frequency memory circuits (DDR SDRAM,RAMBUS, etc.). Magnetic beads need to be added to the power input part. Inductor is an energy storage element used in LC oscillation circuits, medium and low frequency filter circuits, etc. Its application frequency range rarely exceeds 50MHZ.
5. Inductance is generally used for circuit matching and signal quality control. General ground connection and power connection.
Magnetic beads are used where analog and digital are combined. Magnetic beads are also used for signal lines.
The size of the magnetic beads (to be exact, the characteristic curve of the magnetic beads) depends on the frequency of the interference wave that needs to be absorbed by the magnetic beads. Magnetic beads are high frequency resistance, low DC resistance, high frequency resistance. For example, 1000R @ 100Mhz means that there is a resistance of 1000 ohms for signals with a frequency of 100M. Because the unit of a magnetic bead is nominal according to the impedance it generates at a certain frequency, the unit of impedance is also ohms. The datasheet of magnetic beads is usually accompanied by a characteristic curve of frequency and impedance. Generally, 100MHz is taken as the standard, such as 2012B601, which means that the Impedance of magnetic beads is 600 ohms at 100MHz.