Ferrites

Series No. 7000

MAJR ferrite products render cable or electronic components less of an antenna, reducing EMI/RFI as an unwanted radiated emission and/or improving protection from external EMI/RFI.

Ferrite cores are made of iron, nickel, magnesium, zinc and other oxides and carbonates. These raw materials are compressed and molded to a specific form and then fired between 1000 to 1,500 deg. C in a special oven that controls oxygen, nitrogen, and other gases at precise temperature and timing signatures.

The firing process transforms the raw materials into a homogenous ceramic part called a ferrite. The ferrite material may be machined or originally molded to meet specific mechanical core profiles such as QP, EP, RM, E, ETD, pot, planar, toroid, clamp-on, etc.

Standard Products

Flat Cable Suppression Core (MRP Type)

  • Split ferrites for EMI suppression on flat cable assemblies.
  • Internal floppy disk and hard disk ribbon cables.
  • Internal ribbon cables between circuit boards and data connectors.
  • Internal ribbon cables with 8, 16, 32 or 64-bit digital signal busses.

Flat Cable Suppression Cores (MRS Type)

  • Rectangular solid ferrites for EMI suppression on flat cable assemblies.
  • Internal floppy disk ribbon cables.
  • Internal ribbon cables between circuit boards and data connectors.
  • Internal ribbon cables with 8, 16, 32 or 64-bit digital signal busses.

Round Cable Suppression Core (MSC Type)

  • Enclosures for channel-type EMI-suppressor snaps.
  • Internal and external power cables.
  • Internal cables between PC boards and data connectors.

Round Cable Suppression Cores (MRC Type)

  • Enclosures for channel-type EMI-suppressor snaps.
  • Internal and external power cables.
  • Internal cables between PC boards and data connectors.

Connector Suppressor Elements (MFD Type)

  • EMI suppression for connectors and dual in-line integrated circuits.
  • 9, 15, 25 and 37 pin subminiature “D” connectors.

Connector Suppressor Elements (F Type)

  • Specially designed for Ethernet module jacks or phone jacks.

Toroidal Cores (MRT Type)

  • T-type ring cores for coupling transformers and balancing coils, fixed coils and filter coils.

Sleeve Cores (MRI Type)

  • Produced for assembling cable wire and making MATV CATV.
  • Internal and external computer data and power cables.

Wound Chip Beads (MBC Type)

  • For computer products (mother board, hard disk, TV card, etc.); communication products (pager, cordless phone, etc.); modems, OA products, power suppliers, etc.
  • Counter-measures for complying with CE, FCC, or VCCI radiated emissions.

Multi-line Suppressor Beads (SH Type)

  • Filtering of power input pins of oscillators or logic devices using high speed docks.
  • Filtering of low-frequency input/output signal entering/exiting shielded enclosures.
  • High frequency filtering of medium speed docks and video signals.
  • Preventing oscillation in high-frequency amplifiers.

Wide Band Choke (7R61 Series)

  • Mainly used in PC boards to filter EMI from the outside.
  • High-performance medium-current DC power and signal filtering.

Rod Cores (R Type)

  • For coils which do not require adjustments as well as for magnetic shielding.

Balun Cores (RID, RHH, R4H Types)

  • For wide-band transformers that provide balance to unbalanced transformers. Also used in the input circuits for TV and FM tuners, and in CATV, MATV networks and installations.

Multi-layer Chip Beads (FBM Type)

  • EMI suppression for various electric equipment by the addition of impedance to the circuit. Particularly effective with unstable grounding.
  • High-frequency EMI prevention of computers, printers, VCRs, TVs and portable telephones.

Multi-layer Chip Inductors (FLM Type)

  • EMI suppression for various electric equipment by the addition of impedance to the circuit. Suitable for all computer-related products. For composing different LC filters with capacitors to modify signal wave-form, such as TV-out in a notebook computer or audio-out in a CD-ROM circuit.

Wound Chip Inductors (FLC Type)

  • Used for computer products (hard disks, floppy disks, etc.), communication products (cordless phones, etc.), modems, OA products, TV sets, VCRs, etc.

Counter-measures for complying with CE, FCC, VDE or VCCI radiated emissions.

  • High resistance to heat and humidity as well as resistance to mechanical shocks and pressure.
  • Accurate dimensions for automatic surface mounting.

Common Mode Choke & SMD Power Choke

  • Used for prevention of common mode noise on signals and power lines for computer-related products.
  • High impedance for common mode noise and low impedance for differential mode signal.
  • Large rated current available.
  • Wide-band or sharp-type impedance curve available.
  • SMD or DIP types available.

Custom Product

Product Data Sheet

Technical Information

Property Initial Permeability Curie Temperature Specific Gravity Loss Factor at Frequency Temp. Coef. of Initial Permiability 20-70˚C
Unit k ˚C g/cm3 10-6MHz 10-6˚C
Symbol µi Tc d 1/µiQ aµir
A6 1800±25% >100 4.7 75 (0.5) 0-3
K5 850±25% >130 4.8 260 (1.0) 3-6
K5B 700±25% >140 4.8 250 (1.0) 0-7
K2A 350±25% >150 4.7 60 (2.0) 15-40
K3A 300±25% >150 4.7 100 (2.0) 4-12
A17 300±25% >300 4.6 90 (5.0) 0-7
A78 300±25% >150 4.7 60 (2.0) 15-40
K1C 250±25% >200 4.7 110 (2.0) 3-10
A8 200±25% >250 4.7 35 (7.0) 19-32
A3 100±25% >300 4.4 160 (2.0) 55-130
K8B 55±25% >300 4.7 400 (2.0) 5.15