Chip inductors: RF and wireless communication, information technology equipment, radar detectors, automotive electronics, cellular phones, pagers, audio equipment, personal digital assistants (PDAs), wireless remote control systems, and low-voltage power supply modules.
Chip magnetic beads: filtering between clock generation circuits, analog circuits, and digital circuits, I/O input/output internal connectors (such as serial ports, parallel ports, keyboards, mice, long-distance telecommunications, local area networks), between RF circuits and easily interfered logic devices, filtering high-frequency conducted interference in power supply circuits, EMI noise suppression in computers, printers, video recorders (VCRS), television systems, and mobile phones.
The unit of magnetic beads is ohms, because the unit of magnetic beads is nominal based on the impedance it produces at a certain frequency, and the unit of impedance is also ohms.
The DATASHEET of magnetic beads usually provides characteristic curves of frequency and impedance, with 100MHz as the standard. For example, at a frequency of 100MHz, the impedance of magnetic beads is equivalent to 1000 ohms.
For the frequency band we want to filter, we need to choose a magnetic bead impedance that is as high as possible, usually with an impedance of 600 ohms or higher.
In addition, when selecting magnetic beads, attention should be paid to the flux of the beads, which generally needs to be reduced by 80%. When used in power circuits, the impact of DC impedance on voltage drop should be considered.
