Surge Absorber Cores

ABOUT SURGE ABSORBER CORES

Cores are made from Nanocrystalline ribbon which is processed using an exclusive anneal, which is done under a magnetic field to tailor the BH curve for these specific applications. Both beads (leaded and non-leaded) and Surge Absorber Cores have a saturation magnetic flux density of Bs=1.23T, which is twice as high as a Co-based amorphous metal, and three times higher than that of a Ni-Zn ferrite. The core loss is 80W/kg at 100kHz, Bm=0.2T, which is comparable to a Co-based amorphous metal along with the pulse permeability.

These cores have very stable performance with respect to temperature, due to their high Curie temperature of 570°C. Note that Co-based amorphous metal and Ni-Zn ferrite Curie temperature is approximately 200°C. Nanocrystalline cores have a very small decrease of permeability and increase of coercivity and core loss over time (aging effect), as opposed to Co-based amorphous metal which have rather large changes in these values over time. Nanocrystalline amorphous metal offers size and labor savings for various power conversion and EMC applications.

SURGE ABSORBER BEADS

Nano crystalline surge absorber beads green coating

These are used for low power and are made from NANO amorphous tape. They perform well when used to suppress various kinds of current or voltage surges in Switched-Mode Power Supplies(SMPS), Frequency Inverters, ASD and UPS, and other applications for effective noise suppression caused by rapid changes in current.

The high pulse permeability of these cores allows for excellent performance in the suppression of reverse recovery current from the diode, and ringing or surge current from the switching circuit.

The saturation magnetic flux density is twice as high as that of the Co-based amorphous metal, and three times higher than that of the Ni-Zn ferrite. The pulse permeability and the core loss are comparable to a Co-based amorphous metal. As a result, a core made of this material offers higher performance in suppression of surge current and voltage.

Absorber Beads have an inner diameter of 1.6mm and an outer diameter of 4 to 5mm, and lengths range from 5 to 7mm. These suppress various kinds of surge currents, for example, surge from a switching diode.
Nanocrystalline surge absorber beads black coating

These have exceptional performance in applications such as:

1. Suppression of reverse recovery current and surge current from a diode in switching mode power supplies or inverters. 2. Suppression of surge current at the moment of activation of a switching diode, such as power MOS-FET. 3. Suppression of spike or ringing current generated in a switching circuit.
Amor sa02 Toroidal type bead core

LEADED SURGE ABSORBER BEADS

Finemet beads with lead wire

Leaded Beads have the same properties as the Non-Leaded Absorber Beads above but allow for direct PCB mounting and come in both horizontal and vertical versions.

Amor sa03

Horizontal and vertical mounted leaded cores

Cross Reference To Other Common Beads

AMOBEADS® vs. FM BEADS®
AMOBEADS® OD (mm) ID (mm) HT (mm) Total Flux (u Wb) min Al Value (u H/N2) min FM BEADS® OD (mm) ID (mm) HT (mm) Total Flux (u Wb) min Al Value (u H/N2) min
AB3X2X3W 4 1.5 4.5 0.9 3 FT-3AM B3X 4 1.5 5 2.2 2
AB3X2X4.5W 4 1.5 6.0 1.3 5
AB3X2X6W 4 1.5 7.5 1.8 7 FT-3AM B3AR 4 1.5 7 3.6 3.3
AB4X2X4.5W 5 1.5 6.0 2.7 9
AB4X2X6W 5 1.5 7.5 3.6 12 FT-3AM B4AR 5 1.5 7 7.3 5.5
AB4X2X8W 5 1.5 9.5 4.8 16
AMOBEADS® with lead vs. FM BEAD® with lead
AMOBEADS® OD (mm) LENGTH for Leads (mm) HT for Core (mm) Total Flux (u Wb) min Al Value (u H/N2) min FM BEADS® OD (mm) LENGTH for Leads (mm) HT for Core (mm) Total Flux (u Wb) min Al Value (u H/N2) min
LB4X2X8F 6 16 12 4.8 16 FT-3AM B4ARL 5 15 7 7.3 5.5
LB4X2X8U 6 20 12 4.8 16 FT-3AM B4ARL 5 13 7 7.3 5.5
Spikekiller® vs. Surge Absorber® (Total Flux equivalent products)
Spikekiller® OD (mm) ID (mm) HT (mm) Total Flux (u Wb) min Al Value (µ H/N2) min Surge Absorber® OD (mm) ID (mm) HT (mm) Total Flux (u Wb) min Al Value (u H/N2) min
SA7X6X4.5 9.0 4.4 7.5 1.8 1.1
SA8X6X4.5 10.0 4.4 7.5 3.6 2.0
SA10X6X4.5 12.3 4.4 7.5 7.2 3.3 FT-3AH C13X 14.9 7.5 5.5 7.6 -
SA14X8X4.5 16.3 6.3 7.5 10.8 3.6 FT-3AH C11A 14.7 8.6 6.4 11.8 -

Download EMC brochure for information on beads


SURGE ABSORBER CORES

Inductive absorbers toroid cores black

Saturable Cores are surge absorbers used in medium to large handling power applications. These blue line absorber toroid cores and black inductive absorber cores use a Nanocrystalline material with a special anneal, providing high saturation flux density of Bs=1.23T and low core loss of 80W/kg at 100kHz, Bm=0.2T.

Surge Absorber Cores are normally used as a single-turn choke as a line absorber or inductive absorber. Saturable cores are also appropriate for MagAmp circuits when used below 150kHz .
Cores range in size from outside diameters of 11 to 38mm and inside diameters of 4 to 22mm.
Amor core 03 (2)
Blue noise line absorber toroid cores
Finished dimensions (±0.3mm) 2Φs (µWb) min
OD (mm) ID (mm) HT (mm) Ac (cm2) Lm (cm) Mass (g) 25°C 120°C
MP1005LF3S 10.9 5.6 5.7 0.060 2.59 1.2 11.8 11.1
MP1205LF3S 13.8 6.8 6.6 0.057 3.14 1.4 11.2 10.6
MP1303LF3S 14.7 7.9 5.1 0.041 3.50 1.1 8.1 7.6
MP1305LF3S 14.4 7.9 6.7 0.057 3.46 1.5 11.2 10.6
MP1405LF3S 15.8 7.9 6.7 0.083 3.67 2.3 16.3 15.3
MP1506VF3S 17.1 7.8 8.3 0.140 3.86 4.1 27.6 25.9
MP1603VF3S 17.8 11.0 5.1 0.041 4.50 1.4 8.1 7.6
MP1805VF3S 20.8 10.8 6.8 0.108 4.88 4.0 21.3 20.1
MP1903VF3S 21.2 11.0 5.1 0.082 5.00 3.1 16.1 15.2
MP1906VF3S 21.2 11.0 8.3 0.161 4.99 6.1 31.7 29.9
MP2303VF3S 24.9 14.9 5.1 0.081 6.19 3.8 15.9 15.0
MP2705LF3S 29.5 14.8 6.7 0.207 6.89 10.8 40.7 38.3
MP3210VF3S 35 19.9 11.5 0.388 8.58 25.3 76.4 71.9
Total Flux equivalent products Mean magnetic path equivalent products
MS series OD (mm) ID (mm) HT (mm) Total Flux (µ Wb) min Le (mm) Surge Absorber® OD (mm) ID (mm) HT (mm) Total Flux (µ Wb) min Le (mm)
MS7X4X3W 9.1 3.3 4.8 3.2 18.8
9.1 3.3 4.8 3.2 18.8 FT-3AH T8A 9.5 4 6.6 11.8 20.4
MS10X7X4.5W 11.5 5.8 6.6 4.7 26.7
11.5 5.8 6.6 4.7 26.7 FT-3AH C10A 11.4 4.8 6.4 15.7 25.1
MS11X9W 13.8 6.8 6.6 3.2 30.5
13.8 6.8 6.6 3.2 30.5 FT-3AH T12A 13.5 6.6 6.6 15.7 31.4
MS12X8X4.5W 13.8 6.8 6.6 6.3 31.4 FT-3AH C13X 14.9 7.5 5.5 7.6 34.9
13.8 6.8 6.6 6.3 31.4 FT-3AH T12A 13.5 6.6 6.6 15.7 31.4
MS15X10X4.5W 16.8 8.8 6.6 7.9 39.3 FT-3AH C16X 18.2 10.6 5.5 7.8 45.0
16.8 8.8 6.6 7.9 39.3 FT-3AH T15A 16.7 8.3 6.6 19.7 39.3
MS16x10X6W 17.8 8.8 8.1 12.6 40.8 FT-3AH C11A 14.7 8.6 6.4 11.8 36.1
17.8 8.8 8.1 12.6 40.8 FT-3AH T15A 16.7 8.3 6.6 19.7 39.3
MS18X12X4.5W 19.8 10.8 6.6 9.5 47.1 FT-3AH T8A 9.5 4.0 6.6 11.8 20.4
19.8 10.8 6.6 9.5 47.1 FT-3AH T18A 19.7 6.6 10.3 23.6 47.1
MS21X14X4.5W 22.8 12.8 6.6 11.0 55 FT-3AH C11A 14.7 8.6 6.4 11.8 36.1
22.8 12.8 6.6 11.0 55 FT-3AH C12A 21.3 12.7 7.5 15.7 53.4
MS12X8X3W 13.7 6.4 4.8 4.2 31.4
13.7 6.4 4.8 4.2 31.4 FT-3AH T12A 13.5 6.6 6.6 15.7 31.4
MS15X10X3W 16.7 8.4 4.8 5.3 39.3
16.7 8.4 4.8 5.3 39.3 FT-3AH T15A 16.7 8.3 6.6 19.7 39.3
old-MA26164.5 26 16 4.5 18 66 FT-3AH C54A 26.5 11.6 8.5 16 58.9

How amorphous ribbon is made

Amor process01

The casting process

Ribbon is cast in widths up to 8 inches in wide and then is slit to width required for winding. Special winding machines wind the ribbon in to various Toroidal, Oval and C-core shapes. Cores then are further process via cutting, coating, annealing according to standard offering and customer requests.

Nanocrystalline Amorphous Metal

Amor nanoamor01
Nanocrystalline amorphous metal is produced by rapid quenching a molten alloy to produce a amorphous metal and then heat treating this alloy at higher than its crystallization temperature The alloy forms Nanocrystalline grain size of approximately 10 nm in the amorphous metal.
Amor nanoamor02
Annealing changes BH loops We produce three types of Nanocrystalline material:
  • M-type material is Nanocrystalline material with no magnetic field applied during annealing.
  • H-type material is formed by annealing with a magnetic field applied parallel to the ribbon’s surface, creating a squarer BH loop.
  • L-type material is formed by annealing with a magnetic field applied perpendicular ribbon’s surface, creating a flatter BH loop.
Advantages are: •High saturation magnetic flux density, more than 1 Tesla •High permeability over 10,000u at 100kHz •Excellent temperature characteristics. Very high Curie temperature (570°C) resulting in small permeability variation (less than +/-10%) at a temperature range of -40°C to 150°C.