− 1 −
アモルファス磁性部品
Amorphous Magnetic Parts
Amorphous Magnetic Parts
http://www.toshiba-tmat.co.jp/ 2K1412
Amorphous Magnetic Parts
English
− 2 −
Amorphous Magnetic Materials and their Applications
Amorphous Magnetic Materials and their Applications
Amorphous alloy is a general term for a metal with a non-crystalline structure of atoms.
Regular alloys have a uniformly formed metallic crystalline structure, but for amorphous alloys,
the atoms are distributed randomly. As a result of this random atomic distribution, the
magnetic properties of amorphous alloys are anisotropic. Also, in addition to an increase of
electrical resistivity, thin ribbons are made so that the eddy current losses will be small and
the magnetic characteristics will be significantly improved.
At Toshiba Materials, we manufacture a Cobalt based amorphous alloy by the liquid rapid
cooling method. This method of rapid cooling, at a rate of about 1 million degrees per second,
prevents the metal from solidifying in an amorphous structure rather than in its normal
ordered crystalline structure.
Amorphous Alloy
Regular Alloy
(Crystalline Structure)
Models of Atomic Arrangement
Amorphous Ribbon
There is a magnetic metal material with very unique characteristics that does not have a
crystalline structure. At Toshiba Materials, we focused on the excellent magnetic
characteristic of this amorphous magnetic alloy and started research and development years
ago, anticipating future applications and need for such a product. This Amorphous alloy was
called "alloy of dreams" at the time when we started our research but in recent years, it has
and is finding application in electrical products (desk top computer, copying machine, printer
etc.) Amorphous magnetic parts make it possible to reduce energy consumption, and minimize
electronic circuit noise for electrical products with a product considered environmentally
friendly (RoHS).
Amorphous Alloy
(Non Crystalline Structure)
Index
1．Noise Suppressor Devices AMOBEADSTM
Noise Suppression Devices 4
AB/LB series Standard Specifications 5
Examples of Applied Circuits and their Characteristics
6
Effects of Noise Suppression by AMOBEADSTM 7
2．Noise Suppressor Devices SPIKE KILLERSTM
SPIKE KILLERSTM 8
Wired SPIKE KILLERSTM and AMOBEADSTM 8
Examples of Applied Circuits and Effects of Noise Suppression
9
3．Saturable Cores for Mag-Amps
Saturable Cores for Mag-Amps 10
MT/MS Series Standard Specifications 11
Merits of Mag-Amp Method 12
Full Mag-Amp Metod 12
Examples of Circuit and Characteristics 13
4．
High Magnetic Permeability Cores for Pulse Transformer
High Magnetic Permeability Cores 14
Characteristics 14
FS Series Standard Specifications 15
Applications 15
～Instructions～
How to Select the Proper Size "AmobeadsTM " 16
Principle of the Noise Suppressing Device 17
Mag-Amp Operating Principle 18
Mag-Amp Design (Forward Converter) 19
Examples of the Design 20
Evaluation of the Mag-Amp Circuit Unit 21
Glossary of Amorphous Magnetic Parts 22
Notices on Handle 23
Maintenance and Discontinue List 23
− 3 −
Amorphous Magnetic Materials and their Applications
Amorphous Magnetic Materials and their Applications
Amorphous alloy is a general term for a metal with a non-crystalline structure of atoms.
Regular alloys have a uniformly formed metallic crystalline structure, but for amorphous alloys,
the atoms are distributed randomly. As a result of this random atomic distribution, the
magnetic properties of amorphous alloys are anisotropic. Also, in addition to an increase of
electrical resistivity, thin ribbons are made so that the eddy current losses will be small and
the magnetic characteristics will be significantly improved.
At Toshiba Materials, we manufacture a Cobalt based amorphous alloy by the liquid rapid
cooling method. This method of rapid cooling, at a rate of about 1 million degrees per second,
prevents the metal from solidifying in an amorphous structure rather than in its normal
ordered crystalline structure.
Amorphous Alloy
Regular Alloy
(Crystalline Structure)
Models of Atomic Arrangement
Amorphous Ribbon
There is a magnetic metal material with very unique characteristics that does not have a
crystalline structure. At Toshiba Materials, we focused on the excellent magnetic
characteristic of this amorphous magnetic alloy and started research and development years
ago, anticipating future applications and need for such a product. This Amorphous alloy was
called "alloy of dreams" at the time when we started our research but in recent years, it has
and is finding application in electrical products (desk top computer, copying machine, printer
etc.) Amorphous magnetic parts make it possible to reduce energy consumption, and minimize
electronic circuit noise for electrical products with a product considered environmentally
friendly (RoHS).
Amorphous Alloy
(Non Crystalline Structure)
Index
1．Noise Suppressor Devices AMOBEADSTM
Noise Suppression Devices 4
AB/LB series Standard Specifications 5
Examples of Applied Circuits and their Characteristics
6
Effects of Noise Suppression by AMOBEADSTM 7
2．Noise Suppressor Devices SPIKE KILLERSTM
SPIKE KILLERSTM 8
Wired SPIKE KILLERSTM and AMOBEADSTM 8
Examples of Applied Circuits and Effects of Noise Suppression
9
3．Saturable Cores for Mag-Amps
Saturable Cores for Mag-Amps 10
MT/MS Series Standard Specifications 11
Merits of Mag-Amp Method 12
Full Mag-Amp Metod 12
Examples of Circuit and Characteristics 13
4．
High Magnetic Permeability Cores for Pulse Transformer
High Magnetic Permeability Cores 14
Characteristics 14
FS Series Standard Specifications 15
Applications 15
～Instructions～
How to Select the Proper Size "AmobeadsTM " 16
Principle of the Noise Suppressing Device 17
Mag-Amp Operating Principle 18
Mag-Amp Design (Forward Converter) 19
Examples of the Design 20
Evaluation of the Mag-Amp Circuit Unit 21
Glossary of Amorphous Magnetic Parts 22
Notices on Handle 23
Maintenance and Discontinue List 23
− 4 −
- 8 - - 9 -
AB2.8X4.5DY 4.0±0.2 5.7±0.3 0.9min PBT Black 10,000
AB3X2X3DY 4.0±0.2 4.2±0.3 0.9min PBT Black 10,000
AB3X2X4.5DY 4.0±0.2 5.7±0.3 1.3min PBT Gray 10,000
AB4X2X6DY 5.0±0.2 7.2±0.3 3.6min PBT Black 5,000
AB5X4X3DY 5.95±0.2 4.2±0.3 0.45min PBT Black 5,000
AMOBEADSTM
1． Noise Suppression Devices AMOBEADSTM
1． Noise Suppression Devices AMOBEADSTM
B[T]
40 80
0
0.4
0.6
-0.6
-0.4
-0.2
0.2
-80 -40
Amorphous
Ferrite
H [A/m]
B-H Curve（typical）
AB3X2X3W 4.0 1.5 4.5 3.0 2.0 3.0 0.9 3.0
AB3X2X4.5W 4.0 1.5 6.0 3.0 2.0 4.5 1.3 5.0
AB3X2X6W 4.0 1.5 7.5 3.0 2.0 6.0 1.8 7.0
AB4X2X4.5W 5.0 1.5 6.0 4.0 2.0 4.5 2.7 9.0
AB4X2X6W 5.0 1.5 7.5 4.0 2.0 6.0 3.6 12.0
AB4X2X8W 5.0 1.5 9.5 4.0 2.0 8.0 4.8 16.0
Finished Dimensions [mm] Core Size [mm]＊1 Total Flux
＊
2 AL value
＊
3
O.D. max I. D. min H.T. max O.D. I. D. H.T. φc[μWb] min L[μH] min
W
L
H
AMOBEADSTM with lead
AB／LB Series
AB／LB Series
Example for Noise Suppressing Effect (Chopper Converter)
With an excellent saturable characteristic, "AMOBEADSTM " suppress the reverse recovery current of
the diode and decrease the noise that is occurring. When the current for diode reverses and tries to
go into the recovery condition, the "AMOBEADSTM " displays a large inductance and oppose the
generation of the recovery current. In this instance, a soft recovery is possible for core material with a
smaller coercive force.
Without Countermeasure With AMOBEADSTM
(AB4×2×8W)
Output Noise
Diode Current
１A/div
2,000
An amorphous noise suppression device is unique and completely different from conventional noise
filters. Conventional noise prevention products focus on somehow minimizing the noise after it's been
created, by typically trying to absorb the noise, and so their effectiveness in noise reduction is directly
influenced by frequency of the circuit. Amorphous noise suppressing devices, on the other hand, focus
on the source of the noise and work to prevent or minimize the noise before it has a chance to develop.
The source of the electronic circuit noise is the rapid change of current or voltage, and the
effectiveness of the amorphous cores in eliminating this noise is independent of frequency.
An amorphous noise suppression device is a product that takes full advantage of the unique magnetic
characteristics of the cobalt based amorphous alloy. Toshiba Materials offers two noise suppression
devices, "AMOBEADSTM " and "SPIKE KILLERSTM ". AMOBEADSTM " deliver excellent noise suppression
results and are convenient to use by simply being slipped over the leads of the semiconductor device.
"AMOBEADSTM " are also available with a lead thru and in a surface mount configuration. "SPIKE KILLERSTM ",
which are larger in size than "AMOBEADSTM ", most often are wire wound and are effective in eliminating or
minimizing higher noise levels.
Packing
Unit
[pcs/box]
Insulating
Cover
（100 kHz, RT）
Standard Specifications
☆"AMOBEADSTM " sample kits are available. Please ask sales department.
☆"AMOBEADSTM " and "SPIKE KILLERTM " : Registered trademarks of TOSHIBA MATERIALS Co., Ltd.
☆"AMOBEADSTM " and "SPIKE KILLERTM " : Resistered in U.S.A., France, Germany, U.K., Japan.
3.3
2.4
14.7
AB4X2X6SM
AB3X2X3SM
2.0
2.4
9.4
Basic Snubber Circuit Diagram
Noise Suppression Device
RC Snubber Magnetic Snubber
Type No.
PBT case
Blue
SMD Type AMOBEADSTM
AB3X2X3SM 5.0±0.3 5.0±0.3 4.0±0.3 (1.8×0.35) （6.0） 0.9 min 3.0 2,000
AB4X2X6SM 6.0±0.3 8.0±0.3 5.0±0.3 (1.8×0.52) （9.0） 3.6 min 12.0 1,000
Type No.
＊4 ＊2 ＊3
[A] φc[μWb] L[μH]
Io Total Flux AL value
LCP case
Black
Lead
Finished Dimensions [mm]
width length height
width x thickness
Insulating
Cover
Packing
Unit
[pcs/reel]
＊1 Reference Value ＊2 Minimum Guarantee on Measuring Condition : 50kHz、80A/m(sine wave), R.T.
＊3 Measuring Condition：50kHz, 1V, 1turn, R.T.
＊4 Typical Value, using a cross section of lead
＊5 Measuring Condition：100kHz, 80A/m（sine wave), R.T. ＊6 Tolerance ±0.2［mm］
＊7 Converted from Inductance Value L
1
at 1kHz、100mA(sine wave)、R.T.
φｃ(μWb)＝0.282 x L
1
(μＨ)
Finished Dimensions [mm]
Total Flux*7
O.D. H.T. φc[μWb]
※Inner diameter can pass through a 1.2Ｘ0.7mm lead.
However, Inner diameter of AB5x4x3DY can pass through a 2.5x0.7 mm lead.
Insulating
Cover
Packing Unit
[
pcs
/bag］
Type No.
Current
Total flux
AL Value
[A] φc[μWb] L[μH]
LB4X2X8F 16.0max 4.2±0.5 14.0±1.0 φ1.25±0.1
LB4X2X8U 20.0max 4.0±0.5 5.0±1.0 φ1.25±0.1
*4 *2 *3
1,000
Finished Dimensions [mm]
[pcs/box]
4.8
min 16.0
min
（8.0）
Type No.
Insulating
Cover
PBT case
Black
Recommended Land Pattern (mm)
Radial taping
（Recommend for big demand, 10,000pcs/lot )
D0
P
P0
ａ
ｄ
B
D
E
F
LB4X2X8U
Current＊4 Total Flux＊7
I [A] φc[μWb]
3,000
LB2.8X4.5U 12.7 12.7 φ4.0 9.0max φ0.8 (5) 0.9min
Packing
Unit
B
D
E
F
LB4X2X8F
W series DY sereis
DY series (low price)
W series
Bulk type
C R AB
RoHS compliant products
RoHS compliant products
B D E F
Type No.
[pcs/box]
Packing
Unit
P [mm] Po [mm] Do [mm] a [mm] d [mm]
− 5 −
- 8 - - 9 -
AB2.8X4.5DY 4.0±0.2 5.7±0.3 0.9min PBT Black 10,000
AB3X2X3DY 4.0±0.2 4.2±0.3 0.9min PBT Black 10,000
AB3X2X4.5DY 4.0±0.2 5.7±0.3 1.3min PBT Gray 10,000
AB4X2X6DY 5.0+0.2/-0.3 7.2±0.3 3.6min PBT Black 5,000
AB5X4X3DY 5.95±0.2 4.2±0.3 0.45min PBT Black 5,000
AMOBEADSTM
1． Noise Suppression Devices AMOBEADSTM
1． Noise Suppression Devices AMOBEADSTM
B[T]
40 80
0
0.4
0.6
-0.6
-0.4
-0.2
0.2
-80 -40
Amorphous
Ferrite
H [A/m]
B-H Curve（typical）
AB3X2X3W 4.0 1.5 4.5 3.0 2.0 3.0 0.9 3.0
AB3X2X4.5W 4.0 1.5 6.0 3.0 2.0 4.5 1.3 5.0
AB4X2X4.5W 5.0 1.5 6.0 4.0 2.0 4.5 2.7 9.0
AB4X2X6W 5.0 1.5 7.5 4.0 2.0 6.0 3.6 12.0
AB4X2X8W 5.0 1.5 9.5 4.0 2.0 8.0 4.8 16.0
Finished Dimensions [mm] Core Size [mm]＊1 Total Flux
＊
2 AL value
＊
3
O.D. max
I. D. min H.T. max O.D. I. D.
H.T. φc[μWb] min L[μH] min
W
L
H
AMOBEADSTM with lead
AB／LB Series
AB／LB Series
Example for Noise Suppressing Effect (Chopper Converter)
With an excellent saturable characteristic, "AMOBEADSTM " suppress the reverse recovery current of
the diode and decrease the noise that is occurring. When the current for diode reverses and tries to
go into the recovery condition, the "AMOBEADSTM " displays a large inductance and oppose the
generation of the recovery current. In this instance, a soft recovery is possible for core material with a
smaller coercive force.
Without Countermeasure With AMOBEADSTM
(AB4×2×8W)
Output Noise
Diode Current
１A/div
2,000
An amorphous noise suppression device is unique and completely different from conventional noise
filters. Conventional noise prevention products focus on somehow minimizing the noise after it's been
created, by typically trying to absorb the noise, and so their effectiveness in noise reduction is directly
influenced by frequency of the circuit. Amorphous noise suppressing devices, on the other hand, focus
on the source of the noise and work to prevent or minimize the noise before it has a chance to develop.
The source of the electronic circuit noise is the rapid change of current or voltage, and the
effectiveness of the amorphous cores in eliminating this noise is independent of frequency.
An amorphous noise suppression device is a product that takes full advantage of the unique magnetic
characteristics of the cobalt based amorphous alloy. Toshiba Materials offers two noise suppression
devices, "AMOBEADSTM " and "SPIKE KILLERSTM ". AMOBEADSTM " deliver excellent noise suppression
results and are convenient to use by simply being slipped over the leads of the semiconductor device.
"AMOBEADSTM " are also available with a lead thru and in a surface mount configuration. "SPIKE KILLERSTM ",
which are larger in size than "AMOBEADSTM ", most often are wire wound and are effective in eliminating or
minimizing higher noise levels.
Packing
Unit
[pcs/box]
Insulating
Cover
（100 kHz, RT）
Standard Specifications
☆"AMOBEADSTM " sample kits are available. Please ask sales department.
☆"AMOBEADSTM " and "SPIKE KILLERTM " : Registered trademarks of TOSHIBA MATERIALS Co., Ltd.
☆"AMOBEADSTM " and "SPIKE KILLERTM " : Resistered in U.S.A., France, Germany, U.K., Japan.
3.3
2.4
14.7
AB4X2X6SM
AB3X2X3SM
2.0
2.4
9.4
Basic Snubber Circuit Diagram
Noise Suppression Device
RC Snubber Magnetic Snubber
Type No.
PBT case
Blue
SMD Type AMOBEADSTM
AB3X2X3SM 5.0±0.3 5.0±0.3 4.0±0.3 (1.8×0.35) （6.0） 0.9 min 3.0 2,000
AB4X2X6SM 6.0±0.3 8.0±0.3 5.0±0.3 (1.8×0.52) （9.0） 3.6 min 12.0 1,000
Type No.
＊4 ＊2 ＊3
[A] φc[μWb] L[μH]
Io Total Flux AL value
LCP case
Black
Lead
Finished Dimensions [mm]
width length height
width x thickness
Insulating
Cover
Packing
Unit
[pcs/reel]
＊1 Reference Value ＊2 Minimum Guarantee on Measuring Condition : 50kHz、80A/m(sine wave), R.T.
＊3 Measuring Condition：50kHz, 1V, 1turn, R.T.
＊4 Typical Value, using a cross section of lead
＊5 Measuring Condition：100kHz, 80A/m（sine wave), R.T. ＊6 Tolerance ±0.2［mm］
＊7 Converted from Inductance Value L
1
at 1kHz、100mA(sine wave)、R.T.
φｃ(μWb)＝0.282 x L
1
(μＨ)
Finished Dimensions [mm]
Total Flux*7
O.D. H.T. φc[μWb]
※Inner diameter can pass through a 1.2Ｘ0.7mm lead.
However, Inner diameter of AB5x4x3DY can pass through a 2.5x0.7 mm lead.
Insulating
Cover
Packing Unit
[
pcs
/bag］
Type No.
Current
Total flux
AL Value
[A] φc[μWb] L[μH]
LB4X2X8F 16.0max 4.2±0.5 14.0±1.0 φ1.25±0.1
LB4X2X8U 20.0max 4.0±0.5 5.0±1.0 φ1.25±0.1
*4 *2 *3
1,000
Finished Dimensions [mm]
[pcs/box]
4.8
min 16.0
min
（8.0）
Type No.
Insulating
Cover
PBT case
Black
Recommended Land Pattern (mm)
Radial taping
（Recommend for big demand, 10,000pcs/lot )
D0
P
P0
ａ
ｄ
B
D
E
F
LB4X2X8U
Current＊4 Total Flux＊7
I [A] φc[μWb]
3,000
LB2.8X4.5U 12.7 12.7 φ4.0 9.0max φ0.8 (5) 0.9min
Packing
Unit
B
D
E
F
LB4X2X8F
W series DY sereis
DY series (low price)
W series
Bulk type
C R AB
RoHS
compliant products
RoHS
compliant products
B D E F
Type No.
[pcs/box]
Packing
Unit
P [mm] Po [mm] Do [mm] a [mm] d [mm]
− 6 −
- 10 - - 11 -
Chopper Converter Control Circuit for Motor
Motor Driving Circuit
Forward Converter
AB
AB
M
Push-pull Converter
Effects of Noise Suppression by AMOBEADSTM
Effects of Noise Suppression by AMOBEADSTM
Output Noise Reduction
Spike Voltage Suppression
Primary Surge Voltage
Output Noise
VN
20mv/div
Output Noise
VN
50mv/div
Diode Voltage
VD
10V/div
MOS-FET
Drain-Source
Voltage
VDS
200V/div
Diode Current
ID
5A/div
Actual BH Curve
Output Noise
Without Countermeasure
BH characteristics of Ferrite
B
H
AB
AB
AB
AB
M
RC Snubber +Ferrite Beads AMOBEADSTM "AB4×2×4.5Ｗ"
AMOBEADSTM "AB4×2×4.5Ｗ"
Ferrite Beads 4×2×4 AMOBEADSTM "AB4×2×4.5Ｗ"
Frequency：500kHz
Output Voltage - Current
：5Ｖ-20Ａ
Coreloss Characteristic [AMOBEADSTM ]
Application of Amorphous Noise Suppression Devices
1
10
100
1000
10000
0.01 0.1 1
ΔB | [T]
Pfe [kW/m3］
50kH z
100kH z
200kH z
300kH z
500kH z
Characteristics (Typical value)
Temperature [℃]
0 20 40 60 80 100 120
0.
50
100
φ(t)/φ(25℃)
1k 10k 100k 1M
1
0.1
10
100
AL value［μＨ]
AB3×2×6W
AB3×2×4.5W
AB2.8×4.5DY
AB3×2×3W
AB4×2×6W
AB4×2×4.5W
AB4×2×8W
Frequency Characteristics of Inductance
Frequency f [Hz]
Typical value
R.T.
Sine Wave
Typical Value
R.T.
Spike voltage can be reduced
and ringing phenomena can
also be prevented by AMOBE-
ADS. Also Schottky barrier
diode (SBD) can be protected
from over voltage.
Examples of Applied Circuits and their Characteristics
Examples of Applied Circuits and their Characteristics
Flyback Converter
Flux(φ) Decline Ratio vs. Temperature
Frequency：150kHz
Output Voltage - Current
：15Ｖ-10Ａ
Frequency：250kHz
Output Voltage - Current
：5Ｖ-15Ａ
BH characteristics of Amobeads
When the ferrite is replaced by
AMOBEADS at the secondary
output diode (FRD) of the
forward converter circuit, the
output noise can be tremen-
dously reduced, not only the
noise peak level but also the
amplitude range.
When the ferrite is replaced by
AMOBEADS at the secondary
output diode (SBD) of the
forward converter circuit, the
output noise and harmful
influence to the primary stage
can be reduced. These
effects are based on the
inclination of the actual BH
curves between amorphous
and ferrite materials.
AB
AB
AB
AB
AB
AB
− 7 −
- 10 - - 11 -
Chopper Converter Control Circuit for Motor
Motor Driving Circuit
Forward Converter
AB
AB
M
Push-pull Converter
Effects of Noise Suppression by AMOBEADSTM
Effects of Noise Suppression by AMOBEADSTM
Output Noise Reduction
Spike Voltage Suppression
Primary Surge Voltage
Output Noise
VN
20mv/div
Output Noise
VN
50mv/div
Diode Voltage
VD
10V/div
MOS-FET
Drain-Source
Voltage
VDS
200V/div
Diode Current
ID
5A/div
Actual BH Curve
Output Noise
Without Countermeasure
BH characteristics of Ferrite
B
H
AB
AB
AB
AB
M
RC Snubber +Ferrite Beads AMOBEADSTM "AB4×2×4.5Ｗ"
AMOBEADSTM "AB4×2×4.5Ｗ"
Ferrite Beads 4×2×4 AMOBEADSTM "AB4×2×4.5Ｗ"
Frequency：500kHz
Output Voltage - Current
：5Ｖ-20Ａ
Coreloss Characteristic [AMOBEADSTM ]
Application of Amorphous Noise Suppression Devices
1
10
100
1000
10000
0.01 0.1 1
ΔB | [T]
Pfe [kW/m3］
50kH z
100kH z
200kH z
300kH z
500kH z
Characteristics (Typical value)
Temperature [℃]
0 20 40 60 80 100 120
0.
50
100
φ(t)/φ(25℃)
1k 10k 100k 1M
1
0.1
10
100
AL value［μＨ]
AB3×2×6W
AB3×2×4.5W
AB2.8×4.5DY
AB3×2×3W
AB4×2×6W
AB4×2×4.5W
AB4×2×8W
Frequency Characteristics of Inductance
Frequency f [Hz]
Typical value
R.T.
Sine Wave
Typical Value
R.T.
Spike voltage can be reduced
and ringing phenomena can
also be prevented by AMOBE-
ADS. Also Schottky barrier
diode (SBD) can be protected
from over voltage.
Examples of Applied Circuits and their Characteristics
Examples of Applied Circuits and their Characteristics
Flyback Converter
Flux(φ) Decline Ratio vs. Temperature
Frequency：150kHz
Output Voltage - Current
：15Ｖ-10Ａ
Frequency：250kHz
Output Voltage - Current
：5Ｖ-15Ａ
BH characteristics of Amobeads
When the ferrite is replaced by
AMOBEADS at the secondary
output diode (FRD) of the
forward converter circuit, the
output noise can be tremen-
dously reduced, not only the
noise peak level but also the
amplitude range.
When the ferrite is replaced by
AMOBEADS at the secondary
output diode (SBD) of the
forward converter circuit, the
output noise and harmful
influence to the primary stage
can be reduced. These
effects are based on the
inclination of the actual BH
curves between amorphous
and ferrite materials.
AB
AB
AB
AB
AB
AB
− 8 −
- 12 - - 13 -
JPN.P. No. 3190775
Toshiba Materials Co. Ltd.
USP No. 5745353 〃
Diode Clamp
（68ｋΩ、0.022μF）
CR Snubber
(10Ω、1500ｐF）
Wired AMOBEADSTM
AB44DY0307 applied
Vds
100V/div
Id
1A/div
Swirching
Waveform
Turn-on
Waveform
Output Voltage
Noise
Vds
100V/div
Id
0.5A/div
Vn
20mV/div
Example of Effects（Delaytor）
*1 Tolerance ±0.2［mm］ *2 Reference value
*3 Measuring condition：100kHz、80A/m (sine wave), R.T.
2 ．
Noise Suppression Devices SPIKE KILLERTM
2 ．
Noise Suppression Devices SPIKE KILLERTM
SS7X4X3W
9.1 3.3 4.8 7.5 4.5 3.0 3.38 18.8 3.15
SS10X7X4.5W 11.5 5.8 6.6 10.0 7.0 4.5 5.06 26.7 4.73
SS14X8X4.5W
15.8 6.8 6.6 14.0 8.0 4.5 10.1 34.6 9.46
22max 90min
*1
☆ "SPIKE KILLERTM " : Registered trademarks of TOSHIBA MATERIALS Co., Ltd.
☆ "SPIKE KILLERTM " : Resistered in U.S.A., France, Germany, U.K., Japan.
SPIKEK KILLERTM
*1： Typical Value, using a cross section of winding wire
*2：Total Flux of core × turn
Chopper Converter
Example of applied circuit and it’s characterisitic
Example Circuit：Self-Exiting Single Flyback(RCC)
Wired AMOBEADSTM delay the turn-on time of the MOSFET when they are inserted between the gate of
the MOSFET and drive winding on the primary side of the self-exiting single flyback (RCC). The wired
AMOBEADSTM reduce both noise, due to surge current and switching loss, by turning on the switching
element at the point when the voltage of the transformer becomes low, utilizing the the LC resonance
phenomenon induced by inductance L of the primary winding of the transformer and a snubber capacitor C.
Note : The diode clamp circuit has a tendency to increase the out put noise.
Power Supply Efficiency（Vin:DC140V, Vo:24V)
100%
90%
80%
70%
60%
50%
40%
0 0.5 1 1.5 2 2.5 3
Output Currrent［Ａ］
Eficiency［％］
CR Snubber
Wired AMOBEADSTM
Diode Clamp
Type of wire：1UEW
3max
soldered
A
15±5
B
SR：Wired AMOBEADSTM
L
RgCgQ1
R
C
+
SR
Current
*1
Wire Dia.
N
Flux*2
Dimensions[mm]
AB44DY0305 AB4x2x4.5DY 0.5 0.3 5 13.5 7 9
AB44DY0307 AB4x2x4.5DY 0.5 0.3 7 18.9 7 9
SS07S0309 SS7x4x3W 0.5 0.3 9 28.3 12 8
AB34DY0402 AB3x2x4.5DY 1.0 0.4 2 2.6 6 9
AB34DY0403 AB3x2x4.5DY 1.0 0.4 3 3.9 6 9
AB44DY0402 AB4x2x4.5DY 1.0 0.4 2 5.4 7 9
AB44DY0403 AB4x2x4.5DY 1.0 0.4 3 8.1 7 9
AB44DY0404 AB4x2x4.5DY 1.0 0.4 4 10.8 7 9
SS07S0507 SS7x4x3W 1.5 0.5 7 22.1 12 8
SS07S0510 SS7x4x3W 1.5 0.5 10 31.5 12 8
SS07S0515 SS7x4x3W 1.5 0.5 15 47.3 12 8
SS10S05105 SS10x7x4.5W 1.5 0.5 5 23.7 14 10
SS10S05107 SS10x7x4.5W 1.5 0.5 7 33.1 14 10
SS10S05110 SS10x7x4.5W 1.5 0.5 10 47.3 14 10
SS10S09110 SS10x7x4.5W 5 0.9 10 47.3 15 11
SS14S09108 SS14x8x4.5W 5 0.9 8 75.7 20 11
SS14S09205 SS14x8x4.5W 10 0.9x2 5 47.3 20 11
Input 20[V］
Output 12[V]／2[A]
Frequency 90kHz
Rectifier FRD
Detector Simple Loop Antenna
Testing Condition of Radiant Noise Measurment
RoHS
compliant products
RoHS
compliant products
Standard Specifications
＊
2
＊
2
＊
2
＊
3
＊
3
＊
3
Type No.
Type No. Core No.
PET case
Black
Finished Dimensions [mm]
Insulating
Cover
Core Size [mm]
Effective core
cross section
Ae[mm2] Lm [mm] φc[μWb]min Hc[A/m] Br/Bm[%]
Mean Flux
Path Length Total Flux
O.D. I.D. H.T O.D. I.D. H.T
Coercive
Force
Rectangular
Ratio
Wired SPIKE KILLERTM and AMOBEADSTM
[A] [φmm] [turn] [uWb] A
max
B
max
12 24 36 48 60 72 84 96 108 120
Frequency［MHz］
FM radio band
AMOBEADSTM
Without Countermeasure
[dB/div]
ＣＲ Snubber
Noise Radiation
Examples of Applied Circuits and Effects of Noise Suppression
Examples of Applied Circuits and Effects of Noise Suppression
− 9 −
- 12 - - 13 -
JPN.P. No. 3190775
Toshiba Materials Co. Ltd.
USP No. 5745353 〃
Diode Clamp
（68ｋΩ、0.022μF）
CR Snubber
(10Ω、1500ｐF）
Wired AMOBEADSTM
AB44DY0307 applied
Vds
100V/div
Id
1A/div
Swirching
Waveform
Turn-on
Waveform
Output Voltage
Noise
Vds
100V/div
Id
0.5A/div
Vn
20mV/div
Example of Effects（Delaytor）
*1 Tolerance ±0.2［mm］ *2 Reference value
*3 Measuring condition：100kHz、80A/m (sine wave), R.T.
2 ．
Noise Suppression Devices SPIKE KILLERTM
2 ．
Noise Suppression Devices SPIKE KILLERTM
SS7X4X3W
9.1 3.3 4.8 7.5 4.5 3.0 3.38 18.8 3.15
SS10X7X4.5W 11.5 5.8 6.6 10.0 7.0 4.5 5.06 26.7 4.73
SS14X8X4.5W
15.8 6.8 6.6 14.0 8.0 4.5 10.1 34.6 9.46
22max 90min
*1
☆ "SPIKE KILLERTM " : Registered trademarks of TOSHIBA MATERIALS Co., Ltd.
☆ "SPIKE KILLERTM " : Resistered in U.S.A., France, Germany, U.K., Japan.
SPIKEK KILLERTM
*1： Typical Value, using a cross section of winding wire
*2：Total Flux of core × turn
Chopper Converter
Example of applied circuit and it’s characterisitic
Example Circuit：Self-Exiting Single Flyback(RCC)
Wired AMOBEADSTM delay the turn-on time of the MOSFET when they are inserted between the gate of
the MOSFET and drive winding on the primary side of the self-exiting single flyback (RCC). The wired
AMOBEADSTM reduce both noise, due to surge current and switching loss, by turning on the switching
element at the point when the voltage of the transformer becomes low, utilizing the the LC resonance
phenomenon induced by inductance L of the primary winding of the transformer and a snubber capacitor C.
Note : The diode clamp circuit has a tendency to increase the out put noise.
Power Supply Efficiency（Vin:DC140V, Vo:24V)
100%
90%
80%
70%
60%
50%
40%
0 0.5 1 1.5 2 2.5 3
Output Currrent［Ａ］
Eficiency［％］
CR Snubber
Wired AMOBEADSTM
Diode Clamp
Type of wire：1UEW
3max
soldered
A
15±5
B
SR：Wired AMOBEADSTM
L
RgCgQ1
R
C
+
SR
Current
*1
Wire Dia.
N
Flux*2
Dimensions[mm]
AB44DY0305 AB4x2x4.5DY 0.5 0.3 5 13.5 7 9
AB44DY0307 AB4x2x4.5DY 0.5 0.3 7 18.9 7 9
SS07S0309 SS7x4x3W 0.5 0.3 9 28.3 12 8
AB34DY0402 AB3x2x4.5DY 1.0 0.4 2 2.6 6 9
AB34DY0403 AB3x2x4.5DY 1.0 0.4 3 3.9 6 9
AB44DY0402 AB4x2x4.5DY 1.0 0.4 2 5.4 7 9
AB44DY0403 AB4x2x4.5DY 1.0 0.4 3 8.1 7 9
AB44DY0404 AB4x2x4.5DY 1.0 0.4 4 10.8 7 9
SS07S0507 SS7x4x3W 1.5 0.5 7 22.1 12 8
SS07S0510 SS7x4x3W 1.5 0.5 10 31.5 12 8
SS07S0515 SS7x4x3W 1.5 0.5 15 47.3 12 8
SS10S05105 SS10x7x4.5W 1.5 0.5 5 23.7 14 10
SS10S05107 SS10x7x4.5W 1.5 0.5 7 33.1 14 10
SS10S05110 SS10x7x4.5W 1.5 0.5 10 47.3 14 10
SS10S09110 SS10x7x4.5W 5 0.9 10 47.3 15 11
SS14S09108 SS14x8x4.5W 5 0.9 8 75.7 20 11
SS14S09205 SS14x8x4.5W 10 0.9x2 5 47.3 20 11
Input 20[V］
Output 12[V]／2[A]
Frequency 90kHz
Rectifier FRD
Detector Simple Loop Antenna
Testing Condition of Radiant Noise Measurment
RoHS compliant products
RoHS compliant products
Standard Specifications
＊
2
＊
2
＊
2
＊
3
＊
3
＊
3
Type No.
Type No. Core No.
PET case
Black
Finished Dimensions [mm]
Insulating
Cover
Core Size [mm]
Effective core
cross section
Ae[mm2] Lm [mm] φc[μWb]min Hc[A/m] Br/Bm[%]
Mean Flux
Path Length Total Flux
O.D. I.D. H.T O.D. I.D. H.T
Coercive
Force
Rectangular
Ratio
Wired SPIKE KILLERTM and AMOBEADSTM
[A] [φmm] [turn] [uWb] A
max
B
max
12 24 36 48 60 72 84 96 108 120
Frequency［MHz］
FM radio band
AMOBEADSTM
Without Countermeasure
[dB/div]
ＣＲ Snubber
Noise Radiation
Examples of Applied Circuits and Effects of Noise Suppression
Examples of Applied Circuits and Effects of Noise Suppression
− 10 −
The Mag-amp method is one of several output voltage regulation methods used in switching power supplies.
A saturable core is used in the secondary side of the main transformer to regulate voltage by magnetic
pulse width modulation (PWM). The Mag-amp method is especially effective and economically attractive in
low voltage/high current circuits and is frequently used in power supplies for information processing
equipment, such as desktop PCs and computer servers, in power supplies for office equipment such as
photocopy machines and printers, and in power supplies for communication equipment, such as mobile
phone stations.
Miniaturization, high efficiency, low noise, high reliability, and high precision can be easily realized by adopting
the Mag-amp method.
Utilizing the unique magnetic characteristics of cobalt-based amorphous alloys, we have realized low loss at
high frequencies which cannot be realized using other materials. Our lineup consists of MS series cores,
which are well suited for general purpose applications, and MT cores, which have lower loss than the MS
series.
3. Saturable Cores for Mag-Amps
3. Saturable Cores for Mag-Amps
Standard Specifications
MT / MS Series
MT / MS Series
MT Series
MS Series
Type No.
MS7X4X3W
MS10X7X4.5W
MS12X8X4.5W
MS12X8X4.5W-HF
MS14X8X4.5W
MS15X10X4.5W
MS16X10X6W
MS18X12X4.5W
MS21X14X4.5W
MS26X16X4.5W
MS12X8X3W
MS15X10X3W
9.1
11.5
13.8
13.8
15.8
16.8
17.8
19.8
22.8
29.5
max
13.7
16.7
3.3
5.8
6.8
6.8
6.8
8.8
8.3
10.8
12.8
13.0
min
6.4
8.4
4.8
6.6
6.6
6.6
6.6
6.6
8.1
6.6
6.6
8.0
max
4.8
4.8
7.5
10
12
12
14
15
16
18
21
26
12
15
4.5
7
8
8
8
10
10
12
14
16
8
10
3.0
4.5
4.5
4.5
4.5
4.5
6.0
4.5
4.5
4.5
3.0
3.0
3.38
5.06
6.75
6.75
10.1
8.44
13.5
10.1
11.8
16.9
4.50
5.63
18.8
26.7
31.4
31.4
34.6
39.3
40.8
47.1
55.0
65.9
31.4
39.3
3.15
4.73
6.31
6.31
9.46
7.88
12.6
9.46
11.0
15.8
4.20
5.25
25 max 94 min
23
116
215
215
323
457
649
834
1371
2097
126
277
A
A
A
D
A
A
B
A
A
B
C
C
Basic Circuit Diagram of Mag-Amp method
AB
MT
Mag-Amp
out put
DC
B[T]
H[A/m]
B-H Curve （500kHz, RT)
100
1,000
10,000
100,000
100 1,000
Frequency [kHz]
Core Loss Pfe [kW/m3]
MS
MT
B=±0.2T, RT
MS
MT
0
-0.2
-0.4
-0.6
-300 -200 -100 100 200 300
Basic Characteristics（Typical Value）
Core Loss
0.6
0.4
0.2
MT12S115
MT12S208
MT15S125
MT15S214
MT18S130
MT18S222
MT21S134
MT21S222
MT12X 8X4.5W
MT15X10X4.5W
MT18X12X4.5W
MT21X14X4.5W
1.0
0.9
1.0
0.9
1.0
0.9
1.0
0.9
Wire
Diameter
φ[mm]
Core Type No.Type No.
Type No.
Parallel
Number
N
[turn]
Flux*1*2
[μWb]
Example of Circuit (150kHz)*3
Vo [V] Io [A]
Lead Length
C [mm]
Length of
Non Solder Package
1
2
1
2
1
2
1
2
15
8
25
14
30
22
34
22
94.7
50.5
197
110
284
208
375
243
5
3
12
5
15
12
24
15
6
10
6
10
6
10
6
10
20
20
25
25
28
28
32
32
13
13
15
15
15
15
15
15
20±5 3 max 1,000
[pcs in
a box]
D [mm]
.3
Type of wire
：1UEW
D
C
soldered
A
B
MS
MT
0.0 0.5 1.0 1.5 2.0
50
40
30
20
10
0
Core temperature rise ΔT[℃]
Output current Io[A]
280kHz,15V
Comparison of Core Temperature Rise in a Power Supply
A max B max
O.D.
*2
Core Size
*
5
[mm]
φc[μWb]min
Hc[A/m]
φc･AW
[μWb･mm2]
H.T. H.T.
Total Flux
*2
Br/Bm[%]
*2
Insulating
Covers
*
6
MT Standard Wired Series
*1 The amount of magnetic flux is equal to (Ｎ) ×(φc ).
*2 Measuring condition : 100kHz, 80A/m (sine wave), R.T.
*3 Recommend for designing (note : A design of a transformer in the case may be unable to use this data. Please set up the operating magnetic
flux 70% or less of the magnetic flux.)
*4 Dimensions of the Finished Insulating Covers ; Tolerance : ±0.2mm *5 Reference value
*6 Insulating cover is made with UL94V-0 approved material A : Black PET, B : Black PBT, C : Red LCP, D : Halogen-free
☆ Those other than standard winded articles can be manufactured. Please ask to sales department.
☆ MT sample kits are prepared. Please ask to sales department.
I.D. I.D. Ae [mm2]
Mean Flux
Path Length
Effective Core
Cross Section
*5
Lm [mm]
*5
Coercive
Force
Rectangular
Ratio
O.D.
Finished
Dimensions [mm]
Finished
Dimensions
*
4 [mm]
94 min20 max
Finished
Dimensions
*
4[mm]
I.D.
Core Size
*
5
[mm]
Ae [mm2]
Mean flux
Path Length φc[μWb]min
Hc[A/m]
φc･AW
[μWb･mm2]
Type No.
O.D.
Effective Core
Cross Section
*5
Lm [mm]
Total Flux
*
2
Br/Bm[%]
*2
*2
Insulating
Covers
*
6
H.T.
H.T. I.D. *5
Coercive
Force
Rectangular
Ratio
O.D.
MT10X7X4.5W
MT12X8X4.5W
MT14X8X4.5W
MT15X10X4.5W
MT16X10X6W
MT18X12X4.5W
MT21X14X4.5W
MT12X8X3W
MT15X10X3W
11.5
13.8
15.8
16.8
17.8
19.8
22.8
13.7
16.7
5.8
6.
6.8
8.8
8.3
10.8
12.8
6.4
8.4
6.6
6.6
6.6
6.6
8.1
6.6
6.6
4.8
4.8
10
12
14
15
16
18
21
12
15
7
8
8
10
10
12
14
8
10
4.5
4.5
4.5
4.5
6.0
4.5
4.5
3.0
3.0
5.06
6.75
10.1
8.44
13.5
10.1
11.8
4.50
5.63
26.7
31.4
34.6
39.3
40.8
47.1
55.0
31.4
39.3
4.73
6.31
9.46
7.88
12.6
9.46
11.0
4.20
5.25
116
215
323
457
649
834
1371
126
277
A
A
A
A
B
A
A
C
C
RoHS compliant products
RoHS compliant products
− 11 −
The Mag-amp method is one of several output voltage regulation methods used in switching power supplies.
A saturable core is used in the secondary side of the main transformer to regulate voltage by magnetic
pulse width modulation (PWM). The Mag-amp method is especially effective and economically attractive in
low voltage/high current circuits and is frequently used in power supplies for information processing
equipment, such as desktop PCs and computer servers, in power supplies for office equipment such as
photocopy machines and printers, and in power supplies for communication equipment, such as mobile
phone stations.
Miniaturization, high efficiency, low noise, high reliability, and high precision can be easily realized by adopting
the Mag-amp method.
Utilizing the unique magnetic characteristics of cobalt-based amorphous alloys, we have realized low loss at
high frequencies which cannot be realized using other materials. Our lineup consists of MS series cores,
which are well suited for general purpose applications, and MT cores, which have lower loss than the MS
series.
3. Saturable Cores for Mag-Amps
3. Saturable Cores for Mag-Amps
Standard Specifications
MT / MS Series
MT / MS Series
MT Series
MS Series
Type No.
MS7X4X3W
MS10X7X4.5W
MS12X8X4.5W
MS12X8X4.5W-HF
MS14X8X4.5W
MS15X10X4.5W
MS16X10X6W
MS18X12X4.5W
MS21X14X4.5W
MS26X16X4.5W
MS12X8X3W
MS15X10X3W
9.1
11.5
13.8
13.8
15.8
16.8
17.8
19.8
22.8
29.5
max
13.7
16.7
3.3
5.8
6.8
6.8
6.8
8.8
8.3
10.8
12.8
13.0
min
6.4
8.4
4.8
6.6
6.6
6.6
6.6
6.6
8.1
6.6
6.6
8.0
max
4.8
4.8
7.5
10
12
12
14
15
16
18
21
26
12
15
4.5
7
8
8
8
10
10
12
14
16
8
10
3.0
4.5
4.5
4.5
4.5
4.5
6.0
4.5
4.5
4.5
3.0
3.0
3.38
5.06
6.75
6.75
10.1
8.44
13.5
10.1
11.8
16.9
4.50
5.63
18.8
26.7
31.4
31.4
34.6
39.3
40.8
47.1
55.0
65.9
31.4
39.3
3.15
4.73
6.31
6.31
9.46
7.88
12.6
9.46
11.0
15.8
4.20
5.25
25 max 94 min
23
116
215
215
323
457
649
834
1371
2097
126
277
A
A
A
D
A
A
B
A
A
B
C
C
Basic Circuit Diagram of Mag-Amp method
AB
MT
Mag-Amp
out put
DC
B[T]
H[A/m]
B-H Curve （500kHz, RT)
100
1,000
10,000
100,000
100 1,000
Frequency [kHz]
Core Loss Pfe [kW/m3]
MS
MT
B=±0.2T, RT
MS
MT
0
-0.2
-0.4
-0.6
-300 -200 -100 100 200 300
Basic Characteristics（Typical Value）
Core Loss
0.6
0.4
0.2
MT12S115
MT12S208
MT15S125
MT15S214
MT18S130
MT18S222
MT21S134
MT21S222
MT12X 8X4.5W
MT15X10X4.5W
MT18X12X4.5W
MT21X14X4.5W
1.0
0.9
1.0
0.9
1.0
0.9
1.0
0.9
Wire
Diameter
φ[mm]
Core Type No.Type No.
Type No.
Parallel
Number
N
[turn]
Flux*1*2
[μWb]
Example of Circuit (150kHz)*3
Vo [V] Io [A]
Lead Length
C [mm]
Length of
Non Solder Package
1
2
1
2
1
2
1
2
15
8
25
14
30
22
34
22
94.7
50.5
197
110
284
208
375
243
5
3
12
5
15
12
24
15
6
10
6
10
6
10
6
10
20
20
25
25
28
28
32
32
13
13
15
15
15
15
15
15
20±5 3 max 1,000
[pcs in
a box]
D [mm]
.3
Type of wire
：1UEW
D
C
soldered
A
B
MS
MT
0.0 0.5 1.0 1.5 2.0
50
40
30
20
10
0
Core temperature rise ΔT[℃]
Output current Io[A]
280kHz,15V
Comparison of Core Temperature Rise in a Power Supply
A max B max
O.D.
*2
Core Size
*
5
[mm]
φc[μWb]min
Hc[A/m]
φc･AW
[μWb･mm2]
H.T. H.T.
Total Flux
*2
Br/Bm[%]
*2
Insulating
Covers
*
6
MT Standard Wired Series
*1 The amount of magnetic flux is equal to (Ｎ) ×(φc ).
*2 Measuring condition : 100kHz, 80A/m (sine wave), R.T.
*3 Recommend for designing (note : A design of a transformer in the case may be unable to use this data. Please set up the operating magnetic
flux 70% or less of the magnetic flux.)
*4 Dimensions of the Finished Insulating Covers ; Tolerance : ±0.2mm *5 Reference value
*6 Insulating cover is made with UL94V-0 approved material A : Black PET, B : Black PBT, C : Red LCP, D : Halogen-free
☆ Those other than standard winded articles can be manufactured. Please ask to sales department.
☆ MT sample kits are prepared. Please ask to sales department.
I.D. I.D. Ae [mm2]
Mean Flux
Path Length
Effective Core
Cross Section
*5
Lm [mm]
*5
Coercive
Force
Rectangular
Ratio
O.D.
Finished
Dimensions
[mm]
Finished
Dimensions
*
4 [mm]
94 min20 max
Finished
Dimensions
*
4
[mm]
I.D.
Core Size
*
5
[mm]
Ae [mm2]
Mean flux
Path Length φc[μWb]min
Hc[A/m]
φc･AW
[μWb･mm2]
Type No.
O.D.
Effective Core
Cross Section
*5
Lm [mm]
Total Flux
*
2
Br/Bm[%]
*2
*2
Insulating
Covers
*
6
H.T.
H.T.
I.D. *5
Coercive
Force
Rectangular
Ratio
O.D.
MT10X7X4.5W
MT12X8X4.5W
MT14X8X4.5W
MT15X10X4.5W
MT16X10X6W
MT18X12X4.5W
MT21X14X4.5W
11.5
13.8
15.8
16.8
17.8
19.8
22.8
5.8
6.
6.8
8.8
8.3
10.8
12.8
6.6
6.6
6.6
6.6
8.1
6.6
6.6
10
12
14
15
16
18
21
7
8
8
10
10
12
14
4.5
4.5
4.5
4.5
6.0
4.5
4.5
5.06
6.75
10.1
8.44
13.5
10.1
11.8
26.7
31.4
34.6
39.3
40.8
47.1
55.0
4.73
6.31
9.46
7.88
12.6
9.46
11.0
116
215
323
457
649
834
1371
A
A
A
A
B
A
A
RoHS
compliant products
RoHS
compliant products