Ferrite Chip Bead Inductor, SMB Type Surface-mount Bead Inductors with Zero Magnetic Flux in the Core
This SMD ferrite bead inductor uses an SMB-type surface-mount package. It offers high-frequency EMI suppression and zero-flux characteristics. The product provides low DCR and high IDC (rated current) capacity. Through-hole axial ferrite beads are also available as an option. It is widely used in noise filtering equipment, power supplies, mobile wireless devices, DC-DC converters, GPS devices, wireless communication equipment, network systems, and xDSL filters. It is also used for EMI protection in computer disk drives and PC boards, effectively filtering EMI noise from external interference sources such as car radios, mobile phones, and video recorders.
Features:
- Surface-mount wire wound beads with high frequency and EMI suppression
- Low DCR and high IDC beads inductor
- Through-hole axial ferrite beads for EMI suppression
- Through-hole ferrite beads in ragged construction
- Through-hole ferrite beads catering for the measurement of FCC and EMC
Application:
- Noise filtering devices
- Power supplies
- Track and SCR control circuits
- Modems, PDP, LCD, and TVs converters
- Mobile radios, DC/DC converters
- GPS devices
- Wireless communication equipments
- Networking system, xDSL filters
- Computer disk drive and PC board to filter the EMI from outside sources such as car radios, mobile phones and VCRs
Electrical specification:
- Impedance: 20Ω Ref@25MHz
- Impedance: 33Ω Ref@100MHz(25Ω Min)
- Impedance: 36Ω Ref@300MHz
- DCR: 0.75mΩ Max
- Rated current: 15A Max
- Rated voltage: 280Vdc Max
- Operating temperature: -40℃ ~ +125℃
Common mode test curve
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FAQ
Q: What are the advantages of zero magnetic flux design?
A: Zero magnetic flux design means the bead has no DC bias flux in the core under normal operating conditions. This prevents core saturation, ensuring stable impedance characteristics and EMI suppression effectiveness even under high-current conditions.
Q: What is the difference between SMB-type and standard SMD chip beads?
A: SMB-type (Surface Mount Bead) is a standardised surface-mount bead package with defined pad dimensions and specifications. It is compatible with automated SMT placement equipment, suitable for high-volume production and compact PCB designs.
Q: How does this product protect PC boards from external EMI interference?
A: The ferrite bead is installed at the entry point of signal lines or power lines. It presents high impedance to high-frequency interference signals, converting external EMI noise energy into heat and dissipating it, preventing interference signals from entering the internal circuitry of the PC board.
