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.
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 |