srss Magnetic Parts

Index1 Noise Suppressor Devices AMOBEADSTM
Noise Suppression Devices
AB/LB series Standard Speciﬁcations
Examples of Applied Circuits and their Characteristics
Eﬀects of Noise Suppression by AMOBEADSTM
2 Noise Suppressor Devices SPIKE KILLERTM
SPIKE KILLERSTM
Wired SPIKE KILLERTM
Examples of Applied Circuits and Eﬀects of Noise Suppression

in i

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9
0

i

3 Saturable Cores for Mag-Amps

m
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n

i
m

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i n

m
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i
in
i n

m
m
m

n
in i

i i
n

i n
i n

m

i

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4 High Magnetic Permeability Cores
High Magnetic Permeability Cores
Characteristics
FS Series Standard Speciﬁcations
Applications
Instructions

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−

−

ni

9
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0

Amorphous Magnetic Materials and their Applications
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 wascalled "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, printeretc.) Amorphous magnetic parts make it possible to ene
nse v ti n t
nsi inand minimize electronic circuit noise for electrical products with a product consideredenvi n ent
sensitive.

Amorphous Ribbon

Amorphous Alloy
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, themagnetic properties of amorphous alloys are anisotropic. Also, in addition to an increase ofelectrical resistivity, thin ribbons are made so that the eddy current losses will be small andthe 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.

Models of Atomic Arrangement

Regular Alloy

Amorphous Alloy(Crystalline Structure)(Non Crystalline Structure)

−

−

oise

uppressione ices AM

AM
M

An amorphous noise suppression device is unique and completely diﬀerent from conventional noiseﬁlters. Conventional noise prevention products focus on somehow minimizing the noise after it's beencreated, 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 theeﬀectiveness 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.
and in a surface mount conﬁguration. "SPIKE KILLERSTM ","AMOBEADSTM " are also available with a leadTM
which are larger in size than "AMOBEADS ", most often are wire wound and are eﬀective in eliminating or
minimizing higher noise levels.
C

Noise Suppression DeviceR

AB

RC Snubber

Magnetic Snubber

Basic Snubber Circuit Diagram
B[T]
0.6

Amorphous

0.4

Ferrite

0.2

-80

-40

0

-0.2

40

80
H [A/m]-0.4-0.6（100 kHz, RT）

B-H Curve（typical）

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 thegeneration of the recovery current. In this instance, a soft recovery is possible for core material with asmaller coercive force.

Output Noise
Diode Current
１A/div

With AMOBEADSTM(AB4×2×8W)

Without Countermeasure

- 8 -

−

−

A

eries

RoHS compliant productsStandard Speciﬁcations
AMOBEADSTM
W series
Finished Dimensions [mm]O.D. max I. D. min H.T. max
4.0
1.5
4.5

Type No.
AB3X2X3W

Core Size [mm]＊1
H.T.
O.D.
I. D.
3.0
2.0
3.0

Total Flux＊2
φc[μWb] min
0.9

AL value＊3
L[μH] min
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

Insulating
Cover

Packing
Unit

PBT case
Blue

2,000
[pcs/box]

DY series (low price) （Recommend for big demand, 10,000pcs/lot )Type No.
AB2.8X4.5DY
AB3X2X3DY
AB3X2X4.5DY
AB4X2X6DY
AB5X4X3DY

Finished Dimensions [mm]

O.D.

H.T.

Total Flux*7

φ μInsulating
Cover

Packing Unit
pcs bag］

4.0±0.2
4.0±0.2
4.0±0.2
5.0 0 05.95±0.2

5.7±0.3
4.2±0.3
5.7±0.3
7.2±0.3
4.2±0.3

0.9min0.9min1.3min
3.6min0.45min

PBT Black
PBT BlackPBT Gray
PBT Black
PBT Black

10,00010,00010,0005,000
5,000※Inner diameter can pass through a 1.2Ｘ0.7mm lead.
However, Inner diameter of AB5x4x3DY can pass through a 2.5x0.7 mm lead.

W series

DY sereis

AMOBEADSTM with lead
Bulk type*4

Finished Dimensions [mm]Type No.

±0
0±0

0m
0 0m

0± 0 φ0± 0 φ*2*3

Current Total ﬂux
φ μ
±0
±0

（ 0）

Value Insulating Packing
Unit
Cover
μ
0
min

min

PBT case
Black

000
box

Radial tapingａType No.

P [mm] Po [mm]

LB2.8X4.5U

12.7

Do [mm] a [mm]

12.7

φ4.0

9.0maxd [mm]

Current＊4
I [A]

φ0.8

(5)

Total Flux＊5 Packing
φc[μWb]Unit
0.9min

ｄ

000
box

D0
P0

SMD Type AMOBEADSTM
Type No.

Finished Dimensions [mm]
Lead
width
lengthheight width x thickness

＊4

＊2

Io
[A]

Total Flux
φc[μWb]＊3

AL value Insulating
Cover
L[μH]

AB3X2X3SM

5.0±0.3

5.0±0.3

4.0±0.3(1.8×0.35)（6.0）

0.9 min

3.0

AB4X2X6SM

6.0±0.3

8.0±0.3

5.0±0.3(1.8×0.52)（9.0）

3.6 min

12.0

PackingUnit[pcs/reel]
2,000

LCP case
Black

1,000

Recommended Land Pattern (mm)2.4HL
＊1 Reference Value

W

P

2.0

9.4

AB3X2X3SM＊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 Converted from Inductance Value L1 at 1kHz、100mA(sine wave)、R.T.

＊

φｃ(μWb)＝0.282 x L1(μＨ)
TM☆"AMOBEADS " sample kits are available. Please ask sales department.
TM
TM☆"AMOBEADS " and "SPIKE KILLER " : Registered trademarks of TOSHIBA MATERIALS Co., Ltd.
TM
TM☆"AMOBEADS " and "SPIKE KILLER " : Resistered in U.S.A., France, Germany, U.K., Japan.
- 9 -

− 5 −

2.4
3.3

14.7
AB4X2X6SMExamples of Applied Circuits and their Characteristics
Application of Amorphous Noise Suppression Devices

AB

M

Chopper Converter

AB

Control Circuit for Motor

AB

AB
M

AB

Flyback Converter

AB

Motor Driving Circuit

100

Forward Converter

AB4×2×8W
AB4×2×6W
AB4×2×4.5W

AL value
［μＨ]

10

1

AB3×2×4.5W
AB2.8×4.5DY
AB3×2×3W

Push-pull Converter

Characteristics (Typical value)

1k

100k

Frequency f [Hz]

1M

100

φ(t)/φ(25℃)

Pfe [kW/m3］

1000

100
500kH z300kH z50200kH z
100kH zTypical value
R.T.
Sine Wave

50kH z1
0.01

10kFrequency Characteristics of Inductance

10000

10

Typical Value
R.T.

0.1

0.1

0.

1

0

|ΔB | [T]

20

40

60

80

100

120

Temperature [℃]

Flux(φ) Decline Ratio vs. TemperatureCoreloss Characteristic [AMOBEADSTM ]- 10 -−−

M

Eﬀects of Noise Suppression by AMOBEADS TM
Spike Voltage Suppression

Without Countermeasure

AMOBEADSTM "AB4×2×4.5Ｗ"

Spike voltage can be reduced
and ringing phenomena canalso be prevented by AMOBEADS. Also Schottky barrier
diode (SBD) can be protectedfrom over voltage.

Diode Voltage
VD
10V/div

Frequency：500kHz
Output Voltage - Current：5Ｖ-20Ａ

Output Noise Reduction

Diode Current
ID
5A/div

AMOBEADSTM "AB4×2×4.5Ｗ"

RC Snubber +Ferrite Beads

When the ferrite is replaced by
AMOBEADS at the secondary
output diode (FRD) of theforward converter circuit, theoutput noise can be tremendously reduced, not only thenoise peak level but also theamplitude range.

Output NoiseVN
20mv/div

Frequency：150kHz
Output Voltage - Current：15Ｖ-10Ａ

Ferrite Beads 4×2×4

AMOBEADSTM "AB4×2×4.5Ｗ"

Primary Surge Voltage
MOS-FET
Drain-Source
Voltage
VDS
200V/div

When the ferrite is replaced by
AMOBEADS at the secondary
output diode (SBD) of theforward converter circuit, theoutput noise and harmful
inﬂuence to the primary stage
can bereduced. Theseeﬀects are based on the
inclination of the actual BH
curves between amorphousand ferrite materials.

Frequency：250kHz
Output Voltage - Current：5Ｖ-15Ａ

Output NoiseVN
50mv/div

Output NoiseB
H

Actual BH CurveBH characteristics of Amobeads

BH characteristics of Ferrite- 11 -−−

Noise Suppression De ices S

EStandard Speciﬁcations

TM

E

RoHS compliant products

T

B

T

SPIKEK KILLER

TM
*1

＊2

Core Size [mm]Finished Dimensions[mm]Type No.

O.D.

SS7X4X3W
SS10X7X4.5W
SS12X8X4.5W
SS14X8X4.5W
SS18X12X4.5W
SS21X14X4.5W

I.D.

H.T

O.D.

I.D.

H.T

9.1 3.3
11.5 5.8
13.8 6．
8
15.8 6.8
19.8 10.8
22.8 12.8

4.8
6.6
6.6
6.6
6.6
6.6

7.5
10
12
14
18
21

4.5
7
8
8
12
14

3.0
4.5
4.5
4.5
4.5
4.5

＊2

＊2

＊3

Mean Flux
Eﬀective corecross section Path Length2
Ae[mm ]
Lm [mm]

3.38
5.06
6.75
10.1
10.1
11.8

Total Flux
φc[μWb]min

18.8
26.7
31.4
34.6
47.1
55.0

3.15
4.73
6.31
9.46
9.46
11.0

Coercive
Force ＊3

Rectangular
Ratio ＊3m

90min

Hc[A/m]Br/Bm[%]

Insulating
Cover

PET caseBlack*1 Tolerance ±0.2［mm］ *2 Reference value*3 Measuring condition：100kHz、80A/m (sine wave), R.T.
TM

☆ "SPIKE KILLER" : Registered trademarks of TOSHIBA MATERIALS Co., Ltd.

TM

Wired SPIKE KILLER

SS07S0309
SS07S0507
SS07S0510
SS07S0515
SS10S05105
SS10S05107
SS10S05110
SS10S09110
SS14S09108
SS14S09205

Core

No.

SS7x4x3W
SS7x4x3W
SS7x4x3W
SS7x4x3W
SS10x7x4.5W
SS10x7x4.5W
SS10x7x4.5W
SS10x7x4.5W
SS14x8x4.5W
SS14x8x4.5W

Current*1 Wire Dia. N[A][φmm] [turn]
0.5
1.5
1.5
1.5
1.5
1.5
1.5
5
5
10

0.3
0.5
0.5
0.5
0.5
0.5
0.5
0.9
0.9
0.9x2

9
7
10
15
5
7
10
10
8
5

Flux*2
[uWb]

A max

B max

28.3
22.1
31.5
47.3
23.7
33.1
47.3
47.3
75.7
47.3

12
12
12
12
14
14
14
15
20
20

8
8
8
8
10
10
10
11
11
11

Dimensions[mm]

B
3max

A

15±5

Type No.

soldered
Type of wire：1UEW*1：Typical Value, using a cross section of winding wire
*2：Total Flux of core × turnExample of applied circuit and its characterisitic[dB/div]

Noise Radiation

Without Countermeasure

Chopper Converter
Testing Condition of Radiant Noise Measurment

Input

20[V］

Output12[V]／2[A]Frequency

90kHz

Rectiﬁer

FRD

Detector

Simple Loop Antenna

FM radio bandSnubberTM

AMOBEADS12- 12 -

−

−

24

36

48

60

72

84

Frequency
［MHz］

96

108 120

Examples of Applied Circuits and Eﬀects of Noise Suppression
Example Circuit：Self-Exiting Single Flyback(RCC)
100%

L
R

Q1 Cg Rg

TM

90%
Eﬁciency［％］+

Wired AMOBEADS

SR

C

80%

Diode Clamp

CR Snubber

70%
60%
50%
40%
0

SR：Wired AMOBEADSTM

0.5

1

1.5
2
2.5
Output Currrent［Ａ］

3Power Supply Eﬃciency（Vin:DC140V, Vo:24V)

Example of Eﬀects（Delaytor）
Diode Clamp（68ｋΩ、0.022μF）

CR Snubber(10Ω、1500ｐF）

Wired AMOBEADSTM
AB44DY0307 applied

Swirching
Waveform
Vds
100V/div
Id
1A/div

Turn-onWaveform
Vds
100V/div

Id
0.5A/div

Output Voltage
NoiseVn
20mV/div

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 switchingelement at the point when the voltage of the transformer becomes low, utilizing the the LC resonancephenomenon 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.
- 13 -−−

eference

M

TM

TM

The proper size "AMOBEADSTM " core is selected by calculating the necessary voltage times thetime in seconds (=ﬂux). From its operating theory, there is a need to increase the voltage used in thecalculation by that which develops during the reverse recovery period of diode. The multiple of thevoltage and time (voltage times second) is equal to the operating ﬂux. Therefore, the magnetization Δφns necessary to suppress the noise is calculated by the voltage Ec[V] and time for reverse recovery of
diode, that is added to "AMOBEADSTM "Δφns [Wb] ＝Ec×trr［V×Sec]A good result is achieved when the voltage Ec added to "AMOBEADSTM " is close to voltage added todiode. Please select the "AMOBEADSTM " that have a larger core magnetization φc than the voltage
times seconds that was calculated here. However, the actual noise suppression result for"AMOBEADSTM " on real circuit may diﬀer from the calculated value due to the peculiar recovery
characteristics of the diode used or the circuit structure. So please conﬁrm the eﬀect by performing
examination. "AMOBEADSTM " can be also aﬀected by things like a CR snubber, so please perform
evaluation under condition without any eﬀect of a snubber.
Since "AMOBEADSTM " have high circuit voltage, sometimes an insuﬃcient result is obtained when thereverse recovery time is long and has minimal magnetization. Under this condition, please consider awire wound type "SPIKE KILLERTM "Example of "AMOBEADSTM " Selection
Forward Converter
trr

35nsec60nsec

3.3V
AB3×2×3W
AB3×2×4.5W

5V
AB3×2×4.5W
AB4×2×4.5W

Output Voltage
12V
AB4×2×4.5W
AB4×2×4.5W

15V
AB4×2×4.5W
AB4×2×6W

24V
AB4×2×6W
SPIKE KILLER

15V

24V
AB4×2×4.5W
AB4×2×6W

Flyback Converter
trr

35nsec60nsecOutput Voltage
3.3V
AB3×2×3W
AB3×2×3W

5V
AB3×2×3W
AB3×2×4.5W

12V
AB3×2×4.5W
AB4×2×4.5W

AB4×2×4.5W
AB4×2×4.5W

Example of Noise Reduction

Without CountermeasureWith AMOBEADS(AB4×2×8W)- 20 -− 10 −

eferencerinciple of the Noise Suppressin De ice

We will explain the behavior of "AMOBEADSTM " when slipped over the lead of a switching power supply
output diode.
PeriodⅠ,0(When Diode is On)
During period I, which is when the diode is in the "ON" condition and the forward current is running, the"AMOBEADSTM " are in the saturated magnetic condition "I". There will be almost no inductance under
this condition. (Inductance is proportional to the slope of the B-H curve.)
PeriodⅡ(When Diode is Turn Oﬀ)
During period Ⅱ, which is when the diode current starts to turn oﬀ and the current decreases heading
towards zero, the "AMOBEADSTM " magnetization curve will change like "Ⅱ" in a condition of almost no
inductance until the current crosses zero. Since there is no inductance during this period Ⅱ, the angle
or slope of the diode current during turn oﬀ is constant, a unique characteristic of the "AMOBEADSTM ".
If materials such as ferrite is used, inductance will occur during this period Ⅱ and the angle or slope ofcurrent during the turn oﬀ period will change and this will lead to increased of diode loss.
Period Ⅲ(Reverse Recovery Period)
During periodⅢ, a reverse recovery current tries to ﬂow in a direction opposite to the normal direction ofcurrent ﬂow of the diode and as a result, the magnetization curve of the "AMOBEADSTM " change like "Ⅲ"
and the inductance increases rapidly. At this time, the large inductance of the "AMOBEADSTM "intercepts and opposes the recovery current and converts the current into a soft recovery condition.
Thus by converting the sharp reverse recovery to a soft recovery condition by decreasing the rate of
the current change (di/dt), the "AMOBEADSTM " minimize the rapid change of current (High di/dt) andsuppress the noise in the circuit.
Period Ⅳ(After Reverse Recovery Ends)
During period Ⅳ, when the reverse recovery of the diode ends, the magnetization of the "AMOBEADSTM "will move parallel to the vertical axis of the magnetization curve as shown in period "Ⅳ".
Period Ⅴ (When Diode is Turn On)
The "AMOBEADSTM " magnetization will change as shown in "Ⅴ" of the magnetization curve and go
back to a saturation condition. At this point, the diode will turn on and after a slight delay of the start
up of current, the next current pulse will develop and the cycle described above from PeriodⅠthru Ⅴ will
repeat itself.
As the complete cycle repeats itself at the circuit operating frequency, the "AMOBEADSTM " repeatedly
suppress circuit noise during period III of the cycle by eliminating the rapid change in the reverse
recovery current of the diode, which is the cause of noise.
"AMOBEADSTM " use a cobalt based amorphous alloy with a small coercive force under frequency
and this results in excellent noise suppression.

Reverse Current

Forward Current

φ[Wb]
Ⅱ

Ⅲ

Ⅰ
trr

Ⅰ

Ⅴ

Ⅴ

Ⅱ
Ⅳ

t
Ⅲ
high di/dt
Reverse Recovery

Soft Recovery by AMOBEADSTM

H (A/m)Ⅳ

Ir=Hc×Lm/N

Current Waveform of Diode- 21 -−

1 −Actual BH Curve

Saturable Cores for Ma Amps
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 inlow 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 athigh 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.
Mag-AmpDCMT

out put

ABCore temperature rise ΔT[℃]

Basic Circuit Diagram of Mag-Amp method

50280kHz,15V

40
30

MS

20

MT

10
0
0.0

0.5

1.0

1.5

Output current Io[A]2.0

Comparison of Core Temperature Rise in a Power Supply

Basic Characteristics（Typical Value）
B[T]

0.6

0.4

100,000

MTCore Loss Pfe [kW/m3]

MS
0.2

10,000

-300

-200

-100

0

100

200

-0.2

300

H[A/m]

B=±0.2T, RT

MS
MT

1,000

-0.4

100

-0.6

B-H Curve （500kHz, RT)

100

Frequency [kHz]Core Loss

−

−

1,000

MT

MS Series

RoHS compliant products
BStandard Speciﬁcations

A

D

C

soldered

MT Standard Wired Series
Type No.
MT12S115
MT12S208
MT15S125
MT15S214
MT18S130
MT18S222
MT21S134
MT21S222

Core Type No.
MT12X 8X4.5W
MT15X10X4.5W
MT18X12X4.5W
MT21X14X4.5W

Type of wire：1UEW

Wire
N
Diameter Parallel
φ[mm] Number [turn]

Flux*1*2[μWb]

Example of Circuit (150kHz)*3
Vo [V]

Finished
Dimensions [mm]Io [A]

A max

B max

1.0

1

15

94.7

5

6

20

13

0.9

2

8

50.5

3.3

10

20

13

1.0

1

25

197

12

6

25

15

0.9

2

14

110

5

10

25

15

1.0

1

30

284

15

6

28

15

0.9

2

22

208

12

10

28

15

1.0

1

34

375

24

6

32

15

0.9

2

22

243

15

10

32

15

Lead Length Length of
Non Solder Package
C [mm] D [mm]

20±5

3 max

1,000
[pcs ina box]MT Series
Type No.

Eﬀective Core
Coercive Rectangular φc･AW
Mean ﬂux*6
Total Flux*2
Insulating
Cross Section Path Length
Force *2
Ratio *2
2
Ae [mm2] *5
H.T.
Lm [mm]*5 φc[μWb]min Hc[A/m] Br/Bm[%] [μWb･mm ] Covers

Finished
5
Dimensions*4 [mm] Core Size* [mm]

O.D.

I.D.

H.T.

O.D.

I.D.

MT10X7X4.5W

11.5

5.8

6.6

10

7

4.5

5.06

26.7

4.73

116

A

MT12X8X4.5W

13.8

6.6

12

8

4.5

6.75

31.4

6.31

215

A

MT14X8X4.5W

15.8

6.8
6.8

6.6

14

8

4.5

10.1

34.6

9.46

323

A

MT15X10X4.5W

16.8

8.8

6.6

15

10

4.5

8.44

39.3

7.88

457

A

MT16X10X6W

17.8

8.3

8.1

16

10

6.0

13.5

40.8

12.6

649

B

MT18X12X4.5W

19.8 10.8

6.6

18

12

4.5

10.1

47.1

9.46

834

A

MT21X14X4.5W

22.8 12.8

6.6

21

14

4.5

11.8

55.0

11.0

1371

A

20 max

94 minMS Series
Type No.
Type
No.

Finished
Dimensions*4 [mm]

O.D.

I.D.

H.T.

9

0

0
0

9
9

m

Core Size*5 [mm]
O.D.

I.D.

0

0

0
0

0
0

min

0

m

H.T.

Eﬀective Core Mean Flux
Coercive Rectangular
*6
2
φc･AW
Insulating
Cross Section Path Length Total Flux*
Force *2
Ratio *2
Ae [mm2] *5
Lm [mm]*5 φc[μWb]min Hc[A/m] Br/Bm[%] [μWb･mm2] Covers

0
0

0

9
0

0

0
9

9

C

9
9

m

9 min
9

0

09

*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,: 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.

−−

Merits of the Mag-Amp Method
Since the Mag-amp method uses saturable cores to regulate voltage, there is a big advantage that cannot be achieved bysemiconductor-based regulation methods. The advantage is especially clear when there are large changes in the current.

(Downsizing)

Large currents can be handled by small size cores. Also, there is no need for a heat sink and the numberof parts as the regulation circuit is small. This results in a smaller mount area compared to
semiconductor-based methods.

Power Saving

Because cobalt-based amorphous alloy is used, the operating loss at high frequencies is small. Also, thepower needed for control of the Mag-amp is smaller, enabling power to be saved.

Low Noise

The noise from the output diode is small because the Mag-amp is connected in series with the output
diode. In semiconductor-based methods, since the number of switching elements increases, so also
does the noise.

Miniaturization

High Reliability

Since Mag-amps are magnetic parts, the cores are not destroyed by surges in voltage and current. For
this reason, they have been used in power supplies requiring reliability such as those for electricity orlarge computers.

High Precision

The Mag-amps realize precise output voltage because the secondary side of the main transformer isdirectly controlled. It is possible to conduct voltage torelance with high precision (±1%), from no-loadconditions to full-load conditions.

As seen above, when the Mag-amp method is used in regulating output voltage of switching power supplies, excellent
characteristics can be achieved in size, eﬃciency, noise, reliability, and precision. Advantages in cost performance areespecially realized in low voltage / high current circuits (example: 3.3Vｰ5A).

Full Mag-Amp Method

The simple Mag-amp method is used mainly for voltage control of the post circuit in power supplies, called thecross-regulation (master-slave) method. This cross-regulation method stabilizes the output voltage by feedback of the main
circuit to the primary side. Therefore, the post circuit output is aﬀected by the situation of the load in the main circuit (crossregulation error). There is also the problem that power supplies do not operate unless some current (minimum current) is sent
through the main circuit.
The Full Mag-amp method is a way to solve this problem.
The Full Mag-amp method controls each output at the secondary side. Therefore, there is no need for feedback to the primaryside, and each output can be controlled from no-load conditions. Also, since each output operates independently, theoptimization of the winding ratio for the main transformer and high eﬃciency can be realized compared to thecross-regulation method.
Furthermore, since each output is independent in the Full Mag-amp method, it is only necessary to adjust the circuit where
the speciﬁcation was changed. Therefore, time can be saved in the process of a design change.

Mag-Amp

Mag-Amp0

0
Mag-Amp

Mag-Amp0

0

0

Mag-Amp0

Full Mag-Amp Method

Cross-Regulation (Master-Slave) Method
- 6 -

−

−

0

Examples of Circuits and Characteristics
Examples of Circuit
Mag-Amp

Mag-AmpFlyback converter (ON-OFF Type）
Ringing choke converter（RCC)

Mag-AmpPush-pull converter（Center tap type）

Mag-Amp

Full bridge converter
Mag-AmpForward Converter (ON-ON Type）

Half Bridge Converter

Characteristics (Typical Value)
140

10000

10000

120

500kHz300kHz200kHz

10

1
0.01

100

Magnetic ﬂux density ｜ΔＢ｜［Ｔ］

300kHz

900

MS
MT

0.1

Magnetic ﬂux density｜ΔＢ｜［Ｔ］

10

100

50

500

1000

frequency [kHz]Hc vs. Frequency

1

80.0

1000

100

MT／MS

70.0

800

60.0

MT／MS

600
500
400

90

50.0
40.0

Typical Value
f=100kHz
Hm=80A/m

30.0

300

Typical Value
f=100kHz
Hm=80A/m

200
100
-20

0

20

40

60

Temperature [℃]80

Bm vs. Temperature

100

120

-40

-20

0

80

Typical Value
f=100kHz
Hm=80A/m

70

MT

10.0
0.0

-40

MS

20.0

Br/Bm [%]

700

Hc [A/m]Bm [mT]0

Typical Value
Room Temp.
Sine Wave

Saturable Core MS Core Loss

Saturable Core MT Core Loss0

Typical Value
Room Temp.
Hm=200A/m
Sine Wave60

20

100kHz

1
0.01

1

80

40

50kHz

Typical Value
Room Temp.
Sine Wave
0.1

500kHz200kHz10100kHz100

1000

Hc [A/m ]100

Core Loss Pfe [kW/m3]

Core Loss Pfe [kW/m3]

1000

20

40

60

80

Temperature [℃]

Hc vs. Temperature

100

120

60

-40

-20

0

20

−

−

60

80

100

Br/Bm vs. Temperature

Examples of a use other than Mag-Amp :Resonancer for Switching Power Supply ( Partial Resonace Element ), CT Magnetic Sensor,
Transformer Core for Self-Invertor Oscillator, High Frequency Saturable Core for Current Delay or Timing Control
- 7 -

40

Temperature [℃]120Reference

Mag-Amp Operating Principle

The Mag-Amp method is a switching regulation method for D.C power supply in which the magnetic
switch is created through using saturated area and unsaturated area of the saturable core. Voltage
regulation at the secondary side of the switching supply is realized by P.W.M. (Pulse Width Modulation).
Period (Pulse is on)
When the "ON" pulse is from the main transformer, the ﬂux changes as " " on the actual magnetization
curve. At this time, the saturable core has very high inductance because the core's magnetization is in
an unsaturated area. When voltage is added, it is handled at both ends of the coil and the current does
not ﬂow toward the side with the current load. During Period " ", the voltage is blocked with the switch
OFF, and the pulse width modulation is done.
Period (Mag-amp is saturation)
After some time at Period , the saturable core becomes saturated " " and the inductance rapidly
decreases to a minimum and the current is supplied toward the load side. The switch is ON in Period .
Period (Pulse is oﬀ)
When the pulse from the main transformer is OFF (Period ), the magnetic curve of the saturable corechanges as in . It rises over the magnetization axis from the eﬀects of the reverse recovery current
and leaked current of the output diode.
Period(Reset)While the polarity of the pulse voltage is reversed (Period), there is voltage control whichcorresponds with the preset output voltage by the Mag-amp control circuit. The saturable core's
magnetization changes (resets) itself as in " ".
PeriodPeriodregulated.

is operated repeatedly through the operated frequency and the voltage is

The reset area at Period
and the area at Period is equal. Therefore, by changing the reset amountat Period , the blocked area at Period can be changed, and it becomes possible to regulate voltage
by magnetic P.W.M.

Secondary voltageof the transformer

BH cuve of the material
Actual magnetization curve

B

Ⅰ

Ⅲ
Ⅱ

Voltage of Mag-Amp

Ⅰ
Ⅳ

Ⅲ
Ⅱ

Ⅰ
Ⅳ
E2

Ⅱ

φ

Ⅲ
Ⅱ

Ⅳ
Ⅰ

T

H

Current of Mag-Amp

E2 ×T＝ φ- 16 -−−

Reference

Mag-Amp Design (Forward Converter)

The standard methodology for designing and selecting the proper size mag-amp is to first determine theproduct of the secondary voltage of the transformer and the "on duty" time, measured in seconds. The
proper size mag-amp can then be selected by determining which mag-amp core can adequately handle thehighest product of this secondary voltage and "on duty" time, otherwise known as core flux. All
calculations must be made on the condition that this on-pulse product of voltage and time is at its
maximum.
☆ On-pulse maximum product of time
The on-pulse maximum product of time △φV2 is calculated from the secondary voltage of the transformer(=E2) [V] and the maximum on time duty period (=Don) and operating frequency (=f)[Hz]. For
cross-regulation type circuits, the on-duty values for the main circuit at maximum load current are usuallyused.
ΔφV2 [Wb]＝E2×DON／f [V×Sec]
ΔφV2
DOFF
DON
Mag-Amp
Vo
E2
Io

E2

Mag-Amp circuit of the secondary side

Transformer voltage of the secondary side

☆ Flux needed for mag-amp control
The calculation of the Voltage-time product (=Magnetic Flux) Δφmag differs between when the mag-amp isused for voltage regulation only and when the mag-amp is also used to protect against over currents.
（1）Voltage regulationΔφmag＝ΔφV2×Kv [Wb]

KV=

Vh
Vo

（2）Protection of over currents

Transformer Voltage［Ｖ］

The mag-amp is designed with the standard of noload, because the flux deviation is usually largest
when there is no load. The coefficient for theincremental increase in voltage at no load (Kv) isused. (Kv=<1)
seeright figure

When the mag-amp is also used to protect
against over-currents, the on-pulse maximum
voltage-time productΔφv2 must be handled by the
mag-amp. Therefore, the following calculation isapplied.
Δφmag＝ΔφV2 [Wb]Transformer System

Vh
Mag-Amp Control

V0

Output Current［Ａ］
Output Current vs. Transformer Voltage☆Selection of core size
The core size is selected based on the flux needed to control the mag-amp, Δφmag. The following simplified
calculation is used to select core size.
φ ･Aw ≧Δφmag×Io/(Kf×J) /Kt [Wb・mm2]
Here, φ is the total flux of the core and AW is the core winding area. The values for φ ･Aw are found in
the standard specification chart. Kt is the design safety coefficient; Kf is the coefficient for wire winding, andJ is the current density.
☆Calculation of Number of Turn
The number of turns (Ｎ) is calculated by the following equation, where N is an integer.
N ≧Δφmag / φ min / Kt [turn]☆Calculation of Diameter of the Wire
From the equation for current density J [A/mm2], wire diameterｄ[mm], output current Io[A],Io＝(d/2)2×π×J [A] → d = 2× Io/(π×J) [mm]Please always confirm operation on the actual circuit after design.
- 17 -−−

Reference

amples of t e Design
Here, we show a design example when regulating a
operating frequency of 1 0kHz.
☆On-pulse maximum

V-10A circuit using a forward converter with anoltage-time product

The E2 on the secondary side of the main transformer and the maximum on duty cycle are assumed tobe E2=1 [V] and Don=0. .
ΔφV2＝E2×Don／ [V×Sec]＝[Wb]＝1 ×0. /1 0000
＝ 0[

Wb]

When using a Mag-amp to also protect against over currents, Δφmag＝ΔφV2. Here, we assume that the
mag-amp only regulates voltage and set the incremental increase at the time of no current load as
KV=0.6.
Δφmag＝ΔφV2×KV＝ 0×0.6＝2 [ Wb]☆Choice of core size
The wire winding coefficient, Kf, is the coefficient that it is possible to wind on the inside of a toroidal
core. sually, Kf=0. is used. The current density J is usually set as J=
10[A/mm2]. Here, we assume
J＝ [A/mm2].
If the mag-amp s maximum operating temperature is assumed to be 120 , we assume that the flux
density of the core decreases to 0 . We also allow flux design space to be 70 .
φC･AW ≧Δφmag×Io/(Kf×J)/Kt≧2 ×10/(0. × )/(0. ×0.7)
≧1

.

[

Wb・mm2]

From the standard specification table, MT12

. W is chosen.

um er of wire windingN≧Δφmag/φCmin/Kt [turn]≧2 /6. 1/(0. ×0.7)＝6.
＝7 [turn]☆Wire diameter
When the wire diameter is over φ1.0mm, there is difficulty in the actual wire winding of the toroidal cores.
Therefore, when the output current Io is over [A], parallel winding is used. Here, since Io＝10[A], twoparallel wires are used.
d＝2× Io/2/(π×J) [mm]＝2× 10/2/(π× )＝0.
[mm]
As a result, 2 parallel φ0. mm wires are wound.
☆ esults of design (Operating Frequency 1 0kHz,
MT12

V-10A, Voltage

egulation). W, φ0. mm, 2 parallel windings, 7[turn]

Please always confirm operation on the actual circuit after design. Since the mag-amp is a passive part,it becomes susceptible to effects from the waves of the transformer, and actual operating tests arenecessary.
Design Example ( Forward Converter, 1 0kHz operating
Voltage Control
Current
Voltage

3.3V
5V
12V
15V
24V

6A
(φ1.0mm)

MT12S208
MT12S208
MT15S214MT15S125
MT18S222

Over Current Protection (at E2×DON =1.2Vo

at Kv=0.6

10A
φ0. mm×2p.

MT12S208
MT12S208
MT15S214
MT18S222
MT18S222

1 A
φ0. mm× p.

6A(φ1.0mm)

MT12S208
MT12S115
MT15S125
MT18S130
MT21S134

MT12 : 5turn
MT15 : 6turn
MT18S311
MT18 :14turn
MT21 :19turn

10A
φ0. mm×2p.

MT12S208
MT15S214
MT18S222
MT21S222
MT21:32turn

1 A
φ0. mm× p.

MT15:7turn
MT16:6turnMT21:16turnMT21:20turnMS26:18turnNote) Operating flux is influenced by the main transformer of the circuit, and the value shown in the table is not necessarily applied as it is.
- 1

-

− 1

−

valuation of t e Mag-Amp Circuit

nit

Reference1）At no- oad
enerally, the range of the flux becomes large at no, or small current load. There is a possibility thatthe mag-amp may not be able to control the output voltage because there is a shortage of core flux.
This problem occurs because the large range of the flux density causes saturating on the other sideand there is not enough ability to control the voltage-time product. In order to set the allowances fordesign, the wire winding for the Mag-amp is reduced and the operating range is confirmed.
However, the core flux necessary at the time of no current load is largely influenced by such factors as
the dummy current value. Therefore, when the core flux is large at no current load, such factors as thedummy current value must be ad usted, taking efficiency into account.
2）At Full- oad
enerally, the mag-amp s flux range becomes small at the full current load. There is the possibility that
output voltage cannot be regulated because it is not possible to make the range any smaller. This
problem is called the dead angle.
The allowances for design at full current load are confirmed by increasing the number of wire windings.

Transformer Voltage [ V ]However, the dead angle value is influenced not only by the core characteristics, but also by thereverse recovery current of the output diode and leaked currents. Please select output diodes with fast
recovery times. Also, when using SBD (Schottky Barrier Diode), please use one with small current leaks
and stable temperature characteristics.

Transformer
Dead Angle (ΔVd)
No loadV0

Mag-Amp controlled

Output Current [ A ]Output Current vs. Transformer Voltage） emperature Rise
The temperature rise from no current load to full current load should be confirmed. Since the upper limit
temperature for continuous use of our mag-amp saturable cores is 120 , the mag-amp should bedesigned so that the sum of the surrounding temperature and core temperature rise does not exceed
120 . Please measure core temperature rise under the condition of natural air-cooling (Without
cooling fan). enerally, the mag-amp is designed calculating the temperature rise at ΔT＝ 00 .
With forward converters, the temperature rise at no current load is especially high. When this occurs,
the wire winding should be increased and the operating flux density reduced. When the temperaturerise is too high at full current load, the wire winding should be reduced and the operating magnetic field
reduced.
）Output voltage precision
It is necessary to confirm the voltage regulation characteristics (specifications) from no current load
to full current load conditions. When there is a mismatch between the gain of the mag-amp and thegain of the regulated circuit, the circuit vibrates abnormally. Especially when there are sounds from the
mag-amp circuit, there is a high possibility that the regulated circuit is abnormally vibrating.
）Protection from Over currents
When protecting for over currents, the range of operating flux for the mag-amp becomes large. Please
set the maximum flux range to be 70 of the core flux, similar to when there is no current load.
- 1

− 1

-

−

M
M
After suitable heat treatment has been done, cobalt base amorphous material shows excellent magnetic
properties. TOSHIBA MATERIALS has developed new high permeability core 'FS Series' with this material.
FS series maintain high initial permeability μi especially at the high frequency zone, and are suitable forPulse Transformers, Noise Filter and Cores for Sensors. High permeability enables electronic parts to besmaller and have higher performance.
i

r

abi i

: μi at 10kHz is 100,000 it changes inductance module smaller and higher performance.

: Smaller core loss, higher exchange eﬃciency, lower self heat of core can be obtained.

o

o

on

an

r

abi i

in andaor: Smallr

abi ichange depending on magnetic ﬁeld.

: Small miniature core enables to mount in a PC-card.

Characteristics (Typical Value)
0.8

1,000,000

Speciﬁc Permeability

Ｂ [Ｔ］

0.6
0.4
0.2
-10

-5

FS
Ferrite100,000

5

-0.2

10
H [A/m]-0.4

10,000

1,000

-0.6

100
1

-0.8

10

100

1000

10000

FS26×16×10W
FS32×20×10W

ALVaue [μH/n2]

Ferrite

100

10

100

Frequency [kHz]Core Loss VS. Frequency
巻数

Impedance [Ω/n2 ]

1

1000

１ターン

10

FS26×16×10W
FS32×20×10W

1

FS12×8×4.5W
FS18×12×4.5W
FS21×14×4.5W
10

100

1000

FS12×8×4.5W
FS18×12×4.5W
FS21×14×4.5W

10

0.1

10

100

0.1
1

100

1

10

100

Frequency [kHz]Impedance VS. Frequency

10000

FS32×20×10W
FS26×16×10W
FS21×14×4.5W
FS18×12×4.5W
FS12×8×4.5W

10

1
10

10000

1000

Frequency [kHz]
AL Value VS. Frequency

100

AL Value [μH/n2]Core Loss [kW/m3]

ＦＳ

1

10000

Frequency vs. Permeability

DC BH Curve

1000

1000

Frequency [kHz]100

DC [mA]DC Bias Characteristic- 14 -

−

0 −

1000

S Series

RoHS compliant productsStandard Speciﬁcations
Type No.

Finished Dimensions [mm]Core Size [mm]＊1

O.D.max I.D.min H.T.max

O.D.

I.D.

H.T.

＊1

＊1

Eﬀective core Mean ﬂux
cross section path lengthAe [mm2]
Lm [mm]＊2 ＊3＊4

AL Value Insulating
Cover[μH/n2]

FS12X8X4.5W

14.0

6.6

6.8

12

8

4.5

6.75

31.4

27.0

A

FS18X12X4.5W

20.0

10.6

6.8

18

12

4.5

10.1

47.1

27.0

A

FS21X14X4.5W

23.0

12.6

6.8

21

14

4.5

11.8

55.0

27.0

A

FS26X16X10W

29.5

13.0

13.0

26

16

9.5

35.6

66.0

67.8

B

FS32X20X10W

35.5

17.0

13.0

32

20

9.5

42.8

81.7

65.7

B

Operating temperature has to be less than 85℃ (include self rise up)＊1 Reference value ＊2 Tolerance±30% ＊3 Measuring Condition : 10kHz,10mA, 1turn, R.T.
＊4 Insulating cover made with UL94V-0 Approved Material.
A: PET, B: PBT
Don't hesitate to ask our sales section about other size items.

Applications☆Magnetic core of pulse transformer
Communication instrument
Small size, high density assemble☆Magnetic core for common mode noise ﬁlter
Switching power supply
Communication and measuring instrument☆Magnetic core for current transformer

Common mode noize ﬁlter
for switching power supply

Pulse transformer for terminal adapter
PC

FS

FS

AB
Telephone- 15 -−

5 −lossar o Amorphous Magnetic

Referencearts

Technical Terms
Saturable CoreA magnetic core can be able to saturate. These cores have a high square shaperatio, and it can use magnetic saturation and magnetic being un-saturated.

Toroidal Core

Magnetic core which has doughnut shape.

Cross Section

Eﬀective core cross section area :Ae,Ae [m2] ((OD[m] - ID[m] ) x height HT[m] / 2 ) x pf

Packing Factor pf

The ratio of the absolute area of magnetic material to its geometrical area .

Magnetic Path
Length Lm

Length of the magnetic circuit. In the case of the toroidal core, magnetic mean path
length Lm is adopted.
Lm [m] (OD[m] ID[m]) x /2

Magnetic Flux
Density B

Magnetic ﬂux strength of the material, which is perpendicular magnetic ﬂux of theunit area.
B[T] φ[Wb] / Ae [m2]Magnetic Flux φφ[WbMagnetic Field
Strength H

H[A/m]

Permeability μμInitial Permeability
μi *1First inclination of the initial growth of magnetic ﬂux density B（see the illustration below）

Maximum
Flux Density Bm

In this booklet, Bm is deﬁned as the ﬂux density at the magnetic ﬁeld Hm.
（see the illustration below）

V sec]

B[T] x Ae [m2]I [A] / Lm [m]B / H. Inductance L is proportional to permeability μ.

Residual Magnetic Br is the ﬂux density at the time the magnetic ﬁeld return to H
（see the illustration below）
Fux Density Br

0Total Magnetic Fluxφc

Total magnetic ﬂux of the core. In this booklet, total magnetic ﬂux φc is deﬁned as
the following equation.
φc [Wb] 2 x Bm [T] x Ae [m2]Rectangular Ratio
Br / Bm

The ratio of the Bm and Br. Greater the rectangular ratio, the more superior themagnetic saturability.
Br / Bm Br [T] / Bm [T]Coercive Force Hc

Hc is the cross point of the BH curve and X axis. Smaller the Hc, the less the loss
and the more superior the Hc.（see the illustration below）*1 Initial permeability is out of control in the case of saturable cores, because it is unrelated to the Mag-Amp.

B
magnetic path lengthBrcross section

Bm

μi
-Hc

−

−

0

Hc

Hm

H

otices on

andle Maintenance andiscontinue ist

Reference

Notices of the amorphous magnetic parts on handle
Detail information are described on the technical data sheet or the speciﬁcation for supply.
Ma imum
120(include temperature rising by self-heating, under natural air cooling)
perating emperature(except FS series which is 85 )ireindingMounting

oldering

ircuitesign

Be careful at wire winding or lead insertion. Damage or deformation of the core or
insulating cover has a harmful inﬂuence.
Be careful to the rare short circuit.
Make sure not to apply any stresses which will lead to deformation of the coreexterior.
If the product is to be impregnated, bonded, cleaned or otherwise treated, conﬁrm
that such treatment will not adversely aﬀect the magnetic characteristics.
When impregnating the core, be sure that the magnetic properties will not be
inﬂuenced.
Prevent radiation and conduction from high temperature components from reaching
the core.
Be sure to consider vibration and shock when installing these parts.
When soldering be sure that the core exterior will not be deformed by heat
conducted through the lead wire.
Do not sub ect parts to re-ﬂow or ﬂow soldering. (Except the surface mounting
type)
Be careful, of imput voltage, rated current, ambient temperature and temperature
rise.
When revising the circuit, please recheck the core temperature rise.
Recheck the maximum temperature or maximum loads.

ransport
and torage

Do not drop the parts. Protect the parts from water.

Discontinued List
Discontinued Type No. Substitution (recommend)

Discontinued Type No. Substitution (recommend)

FS10X4X1(FS12X8X4.5W)

MB15X10X4.5

MS15X10X4.5W

MA7X6X4.5X(MS10X7X4.5W)

MB18X12X4.5

MS18X12X4.5W

MA8X6X4.5X(MS10X7X4.5W)

MB21X14X4.5

MS21X14X4.5W

MA10X6X4.5X(MS10X7X4.5W)

MS8X7X4.5W(MS10X7X4.5W)

MA14X8X4.5X

MS14X8X4.5W

MS9X7X4.5W(MS10X7X4.5W)

MA18X12X4.5X

MS18X12X4.5W

MS10X6X4.5W(MS10X7X4.5W)

MA22X14X4.5W(MS26X16X4.5W)

MT10X6.5W

MT10X7X4.5W

MA26X16X4.5W

MS26X16X4.5W

SA4.5X4X3

AB5x4x3DY

MB8X7X4.5(MS10X7X4.5W)

SA5X4X3

AB5x4x3DY

MB9X7X4.5(MS10X7X4.5W)

SA7X6X4.5(SS7X4X3W)

MB10X7X4.5

MS10X7X4.5W

SA8X6X4.5(SS10X7X4.5W)

MB12X8X4.5

MS12X8X4.5W

SA10X6X4.5(SS10X7X4.5W)

MB14X8X4.5

MS14X8X4.5W

SA14X8X4.5

SS14X8X4.5W

AB3X2X6
AB（AB4X2X4.5W)

Attention :Same or similar core size items are listed up for substitution. Magnetic or electric characterisitcs are changeable.
Please test substitution parts before replacing to ensure performance.
Wired parts made by these cores are also discontinued items.

−−

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