Smd ferrite beads are a passive component widely used in electronic devices. Their main function is to suppress high-frequency noise and ensure the purity of the signal. Especially in portable devices such as watches, TWS headphones, mobile phones, etc., the requirements for PCB space and electronic component size are getting higher and higher, which requires the beads to have the characteristics of small size and high current.
The selection scenarios of Smd ferrite beads can be classified according to different application requirements and usage environments. Common classifications include:
1. Ordinary Smd Ferrite Beads: This type of beads is suitable for scenarios with small current (generally less than 600mA) and no special requirements. The DC resistance of ordinary magnetic beads generally does not exceed 1 ohm, and the AC impedance ranges from a few ohms to several thousand ohms. Its main function is to suppress and absorb electromagnetic interference and radio frequency interference.
2. High-current Smd Ferrite Beads: This type of magnetic beads is mainly used in high-current scenarios, so the DC resistance needs to be strictly limited. The DC resistance generally does not exceed 0.1 ohms, and the AC impedance is also smaller than that of ordinary magnetic beads. High-current magnetic beads are suitable for occasions with large currents, such as power line noise reduction. This type of magnetic bead can be widely used in wearable devices, mobile phones, tablets and other electronic devices for power lines or high-current signal lines.
3. Spike-type Smd Ferrite Beads: This type of magnetic bead is mainly used to attenuate signals in a specific frequency range to achieve frequency selection. Its AC impedance is very high in a certain frequency range and very low in other frequency ranges, showing a band-stop characteristic. Spike-type magnetic beads are suitable for suppressing interference at specific frequencies, such as in radio frequency circuits, phase-locked loops, oscillation circuits and ultra-high frequency storage circuits.
According to the specific application scenarios and requirements, choosing the right type of Smd ferrite beads can better achieve the filtering and anti-interference effects of the circuit. It should be noted that the magnetic saturation of Smd ferrite beads only occurs when a large current passes through. If the current decreases, the performance will recover.
Therefore, when selecting Smd ferrite beads, the rated current they can withstand should be fully considered to ensure that they can provide stable impedance characteristics under normal working conditions and achieve the expected noise suppression effect.
ZXcompo is a leading global passive electronic component manufacturer offering SMD Ferrite Beads. Can meet your specific needs. Contact: sales@ZXcompo.com.
