RT3608C-6A - FDK Corporation

FE11001-1212-005

FERRITE COMPONENTS

FOR TV & VCR USE

An integrated maker of ferrites and ferrite

products, FDK has developed many ferrite

materials, and produces a wide selection of

ferrite cores and core products. This catalog

specifically introduces FDK deflection yoke

cores, flyback transformer cores, and rotary

transformers.

Contents

Page

Ferrite cores for deflection yoke..........................2

Ferrite cores for flyback transformer ...................8

Rotary transformers ..........................................16

FERRITE CORES FOR DEFLECTION YOKE

The growing demand for a greater image clarity and

definition in television images has made necessary an

improvement in ferrite cores for deflection yoke. With

the advances in the ferrite technology, FDK has devel-

oped H44V ferrite materials with lower core loss than

H44F. H44V material supplements the existing H44

and H44F widely used in many types of televisions.

FDK also has introduced DS1 ferrite materials suitable

for high quality picture displays with high horizontal

scanning frequency.

Although this catalog presents standard FDK ferrites

and ferrite products, only FDK can design and produce

any type of customized core on a made-to-order basis,

and welcomes inquiries for custom-design cores.

Contents Page

■ Standard characteristics of ferrite cores for deflection yoke ···············3

■ Ferrite materials for deflection yokes according to frequency·············5

■ Shape selection according to application············································5

■ Dimensions of ferrite cores for deflection yoke

● For television ···············································································6

● For display ···················································································7

http://www.fdk.co.jp

■

Standard material characteristics of ferrite cores for deflection yoke

Property Symbol Condition Unit H44 H44F H44V DS1

µiac 0.1MHz —350 400 450 1000

23°C 230 260 240 350

Bs 60°C mT 190 220 210 320

100°C 160 170 170 290

Br 23°C mT 160 190 180 190

Coercivity Hc 23°C A/m 40 24 20 24

Relative loss factor

tanδ/µ 0.1MHz ×10–6<50 <120 <120 <20

Core loss 23°C 420 230 60 45

25kHz Pc 60°CkW/m

3380 170 45 35

100mT 100°C 430 170 40 25

Core loss 23°C 1500 1000 220 180

100kHz Pc 60°CkW/m

31470 850 180 130

100mT 100°C 1640 860 170 110

Curie temperature Tc —°C >150 >150 >135 >150

Resistivity ρ—Ω·m10

5105105102

Apparent density d —kg/m3×1034.5 4.6 4.6 4.8

Note:1. The above values were obtained from FR25φ/15φ/5 troidal cores.

2. The values were obtained at 23±2°C unless otherwise specified.

Temperature (°C)

Bs vs. temperature

Bs (mT)

Temperature (°C)

µiac vs. temperature

µiac

400

300

200

100

40 60 80 100 120

2,000

1,500

1,000

500

20 40 80 140 160100 12060

180

DS1 DS1

H44F H44F

H44V

H44

[1kHz]

AC initial

permeability

Saturation magnetic

flux density

Residual magnetic

flux density

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Temperature (°C)

Core loss vs. frequency

Temperature (°C)

Frequency (kHz)

Core loss (kW/m3)Core loss (kW/m3)

Core loss (kW/m3)

Core loss vs. frequency

100

180

260

20 40 60 80 100 120

100°C

50mT

H44

H44F

H44V

DS1

20 40 60 80 100 120

32kHz

50mT

H44

H44F

H44V

DS1

100

300

250

200

150

20 40 60 80 100 120

100kHz

50mT

H44

H44F

H44V

DS1

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■ Ferrite materials for deflection yoke according to frequency

■ Shape selection according to application

15.75 32 64 128 Frequency (kHz)

Consumer electronics Medium resolution High resolution

Mg-Zn ferrite core H44

Mg-Zn ferrite core H44F

Ni-Zn core H44V

Mn-Zn core DS1

Suitable materials Grades

Applications

Medical use

Control

tower use

Military use

Aviation use

Specialty

display

Personal computer

Computer graphic

display

Word proccessor

Controller display

FA display

Work station

Digital broadcasting display

CAD

DY3839B

DY4349TG

DY4648BA

DY4646AB

DY4646BV

DY4650B

DY4037MA

DY4137CV

DY4232A

DY4037MC

DY4228AM

DY4640L

DY5139CD

DY5047C

DY5042A

DY5245A

DY5645A

DY5139AV

DY5039AB

DY5145A

DY5439MA

DY5647L

DY4032A

DY4034A

DY4336AN

DY4743L

DY4033A

DY4334A

DY4741AT

DY4846M

DY4951GB

DY4748TG

DY4949GH

Screen size

Television Display

http://www.fdk.co.jp

■Dimensions of ferrite cores for deflection yoke

● For television

φD1

φd1

φd2

φD2

Type B

A°

φD1

φd1

φd2

φD2

Type A

Shape code Type

Dimensions (mm)

φD1φd1φD2φd2HTAA°BC

DY4032AT A 072.5±0.89068.00 56.00±0.6039.59±0.5032.00±0.4 7.0 —30.0 9.0 12.0±0.2

DY4033A A 072.5±0.89068.00 56.00±0.6039.59±0.5033.00±0.4 7.0 —30.0 —12.0±0.2

DY4034A A 075.0±0.89071.00 56.00±0.6040.09±0.4034.00±0.4 9.0 —30.0 —12.0±0.2

DY4036A B 077.0±0.89072.58 52.00±0.6040.09±0.4036.50±0.5 7.0 ———12.0±0.2

DY4037MA B 074.0±0.89069.69 52.50±0.6040.49±0.4037.00±0.4 5.0 ———12.0±0.2

DY4037MC B 074.0±0.89069.69 52.00±0.6040.09±0.4037.00±0.5 7.0 ———12.0±0.2

DY4133C B 074.0±0.89069.69 52.00±0.6041.09±0.4033.00±0.4 7.0 ———12.0±0.2

DY4137CV B 074.0±0.89069.69 53.00±0.6041.09±0.4037.00±0.4 7.0 ———12.0±0.2

DY4228AM A 072.5±0.89068.40 56.00±0.6042.09±0.4028.00±0.4 7.0 —30.0 —12.0±0.2

DY4232A A 072.5±0.89068.40 56.00±0.6042.09±0.5032.00±0.5 7.0 —30.0 —12.0±0.2

DY4334A A 089.0±0.99082.66 58.00±0.6043.39±0.5034.00±0.5 5.0 —36.4 —12.0±0.2

DY4336AN A 073.7±0.89069.73 56.00±0.6043.37±0.4035.50±0.4 5.0 —29.0 —12.0±0.2

DY4640L A 089.8±1.09081.86 59.80±1.0046.09±0.5040.00±0.5 5.0 —30.0 —12.0±0.2

DY4735A A 084.8±0.99078.50 62.00±0.6047.29±0.5035.00±0.5 4.0 —30.3 —12.0±0.2

DY4741AT A 089.0±0.99084.00 60.00±0.6046.59±0.5040.50±0.5 5.0 —30.0 13.0 12.0±0.2

DY4743L A 089.8±1.29081.80 59.80±1.0046.89±0.5042.50±0.5 5.0 —29.0 —12.0±0.2

DY4842A A 089.0±1.09084.00 60.00±1.0048.09±0.5042.00±0.5 5.0 —28.0 —12.0±0.2

DY4846M B 090.0±1.29084.84 61.00±0.6048.29±0.5046.00±0.5 5.5 ———12.0±0.2

DY4945A A 124.0±1.39116.19 64.00±0.7049.09±0.5044.50±0.5 5.0 —44.5 —12.0±0.2

DY4948A A 124.0±1.39116.19 65.00±0.7049.09±0.5047.70±0.5 5.0 —40.1 —12.0±0.2

DY5039AB A 110.0±1.10103.64 62.50±0.6050.48±0.4049.00±0.4 5.0 —41.5 13.0 12.0±0.2

DY5041B A 108.0±1.30104.00 65.40±1.0050.49±0.5041.20±0.5 4.5 —41.5 —12.0±0.2

DY5042A A 106.0±1.00100.85 64.00±0.6050.09±0.5042.00±0.4 5.0 —38.5 13.0 12.0±0.2

DY5043C B 114.0±1.10109.60 67.00±0.7050.09±0.5043.00±0.5 5.0 ———12.0±0.2

DY5047C B 119.0±1.20114.60 66.00±0.7050.09±0.5047.00±0.5 5.0 ———12.0±0.2

DY5139AV B 102.3±1.00094.16 64.26±0.6050.52±0.5038.95±0.5 5.5 ———12.0±0.2

DY5139CC B 109.0±1.10104.70 66.00±0.7051.09±0.5039.00±0.4 5.0 ———12.0±0.2

DY5139CD B 108.0±1.10102.70 70.00±0.7051.09±0.5039.00±0.4 6.0 ———12.0±0.2

DY5145A A 112.0±1.00105.36 65.00±0.66 51.09±0.52 44.50±0.5 4.8 —40.0 —12.0±0.2

DY5245A A 114.0±1.00107.65 65.88±0.66 51.88±0.52 44.50±0.5 4.8 —40.0 —12.0±0.2

DY5439MA A 108.0±1.00104.00 70.00±0.8054.09±0.5039.00±0.5 6.0 —42.0 —12.0±0.2

DY5445A A 114.0±1.20109.65 72.00±0.8053.88±0.6044.50±0.5 5.5 —40.0 —12.0±0.2

DY5645A A 118.0±1.20114.10 75.00±0.8056.49±0.6044.50±0.5 5.5 —40.0 —12.0±0.2

DY5647L A 124.0±1.40116.18 72.00±0.7056.09±0.6047.00±0.5 6.0 —39.0 —12.0±0.2

+0.3

–0.5

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● For display

Type A Type B

φD1

φd1

φd2

φD2

A°

φD1

φd1

φd2

φD2

Shape code Type

Dimensions (mm)

φD1φd1φD2φd2HTAA°BC

DY3839B A 069.00±0.7 64.63051.00±0.6 37.61±0.4039.00±0.4 5.00—22.0 11.5 12.0±0.2

DY3935A A 071.00±0.7 66.85055.10±0.6 39.20±0.4035.00±0.5 5.00—17.0 10.0 12.0±0.2

DY3938GA A 071.50±0.7 67.38053.00±0.6 39.52±0.2038.00±0.4 5.00—22.0 12.0 12.0±0.2

DY3939A A 071.00±0.7 66.85055.10±0.6 39.20±0.4039.00±0.5 5.00—17.0 10.0 12.0±0.2

DY3940B A 070.00±0.8 65.88053.00±0.6 39.20±0.4040.00±0.4 5.00—22.0 10.5 12.0±0.2

DY4349TG A 088.90±0.2 81.89055.00±0.6 43.00±0.2049.00±0.2 5.00—32.0 ——

DY4447GV A 087.20±0.9 79.19060.00±0.6 43.57±0.2046.50±0.4 6.12 11.5 ——12.0±0.2

DY4449GV A 087.20±0.9 79.19060.00±0.6 43.57±0.2048.50±0.4 6.12 13.5 ——12.0±0.2

DY4450TG A 091.00±0.2 84.45057.00±0.6 44.00±0.2049.50±0.2 4.00—34.0 ——

DY4545GV A 085.20±1.0 76.36059.00±0.6 45.00±0.2045.00±0.3 5.00—27.0 —12.0±0.2

DY4546B A 090.00±0.9 80.80060.00±0.6 45.26±0.5046.00±0.5 5.00—31.0 10.5 12.0±0.2

DY4549TG A 089.00±0.8 80.60058.00±0.6 45.00±0.2049.00±0.3 5.00—31.0 ——

DY4551GH A 088.20±0.8 82.20060.50±0.6 45.02±0.2050.50±0.3 5.00—26.0 11.5 12.0±0.2

DY4645TG A 088.10±0.2 81.10063.00±0.5 46.00±0.15 44.50±0.2 5.00—25.7 ——

DY4646AB A 085.00±1.0 77.36060.00±0.7 46.27±0.46 46.00±0.5 5.0009.0 —16.5 12.0±0.2

DY4646BA A 085.00±1.0 76.26057.60±0.7 45.84±0.5045.60±0.4 (5.0) —26.0 12.5 12.0±0.2

DY4646BV A 088.00±0.9 79.78059.84±0.6 45.98±0.46 46.00±0.5 5.00—26.0 12.0 12.0±0.2

DY4648BA A 090.00±0.9 82.62060.00±0.6 46.00±0.46 48.00±0.5 5.00—31.0 10.0 12.0±0.2

DY4648GB A 084.14±0.9 78.14061.00±0.6 46.00±0.2048.00±0.3 5.00—24.0 12.0 12.0±0.2

DY4650B A 088.00±0.9 79.78059.84±0.6 45.84±0.46 50.00±0.5 5.00—26.0 12.0 12.0±0.2

DY4650GA A 088.00±0.9 79.78059.84±0.6 45.84±0.23 49.80±0.2 5.00—26.0 12.0 12.0±0.2

DY4748TG A 092.00±0.2 86.54061.20±0.6 47.20±0.2048.00±0.2 6.50—30.0 ——

DY4852TG A 094.00±0.8 88.82060.25±0.5 48.25±0.2051.80±0.2 4.30—31.0 ——

DY4949GH A 096.00±1.0 90.55062.00±0.6 49.65±0.2048.60±0.2 5.00—28.5 16.0 12.0±0.2

DY4951GB A 098.00±1.0 90.67066.40±0.7 49.20±0.60 51.00±0.5 7.00—30.0 15.0 12.0±0.2

DY5248T B 092.00±1.2 86.295 63.80±0.8 51.85±0.42 48.00±0.5 6.00——— —

+0.4

–0+0.2

–0.8

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FERRITE CORES FOR FLYBACK TRANSFORMER

5H20 ferrite materials have been best-seller for tele-

vision flyback transformer cores for many years.

5H30 ferrite materials have been used for display

flyback transformer cores and characterized as

smaller core loss than 5H20.

Besides, FDK had begun the sale of flyback trans-

former cores using the brand-new 5H40 ferrite

materials with a remarkably reduced core loss

enable the development of high-resolution displays.

Contents Page

■

Standard material characteristics of ferrite cores for flyback transformer

......9

■ Comparison of screen size and core shape......................................11

■ Dimensions of ferrite cores for flyback transformer ..........................12

http://www.fdk.co.jp

■

Standard material characteristics of ferrite cores for flyback transformer

Note: 1. The above values were obtained from FR25φ/15φ/5 toroidal cores.

2. The room temperature was 23±2°C in the table unless otherwise specified.

AC initial

permeability

Residual magnetic

flux density

Temperature

coefficient

Saturation magnetic

flux density

Property Symbol Condition Unit 5H20 5H30 5H40

µiac 0.1MHz — 1800 2300 2200

Bs 23°C

520 500 500

(800A/m) 100°C 420 400 400

Br 23°C mT 150 130 130

Corecivity Hc 23°C A/m 13 13 13

Relative loss factor

tanδ/µiac 0.1MHz ×10–6<5 <5 <5

150mT 16kHz

80°C

W/kg

3.9 3.5 2.9

100°C 3.5 3.3 2.7

32kHz

80°C

W/kg

19 18 15

Core loss

100°C171613

200mT 50kHz

80°C

W/kg

36 33 27

100°C322924

100kHz

80°C

W/kg

95 88 72

100°C908570

αµr 20~80°C×10–6866

Curie temperature Tc —°C >200 >200 >200

Resistivity ρ—Ω·m3 3 3

Apparent density d —kg/m3×1034.8 4.8 4.8

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5H40 100°C

5H20 100°C

300mT 200mT

150mT

100mT

102

7101

102

70 400

5H40 100°C

5H20 100°C

100kHz 64kHz

32kHz

16kHz

102

Frequency (kHz)

Core loss (W/kg)

Core loss vs. frequency

Magnetic flux density (mT)

core loss (W/kg)

Core loss vs. magnetic flux density

1,000

2,000

3,000

4,000

5,000

6,000

7,000

1,000

2,000

3,000

4,000

5,000

6,000

7,000

0 50 100 150 200 250

5H40

5H20

5H40

0 100 300200 400

23°C

100°C

Temperature (°C)

µiac

µiac vs. temperature µa vs. magnetic flux density

Magnetic flux density (mT)

µa

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0 20 40 60 80 100 120

5H40

5H30

16kHz

150mT

5H20

100

150

200

250

0 20 40 60 80 100 120

5H30

5H40

100kHz

200mT

5H20

Temperature (°C)

Core loss (W/kg)

Core loss vs. temperature

Temperature (°C)

Core loss (W/kg)

Core loss vs. temperature

14 10

50 60 70 80 90 100 110

φ8

φ10

φ12

φ14

φ16

φ18

Core base

diameter

High-frequency display

High-frequency

display

Color TV

Size in inches

Input voltage (W)

■Comparison of screen size and core shape

http://www.fdk.co.jp

■Dimensions of ferrite cores for flyback transformer

●RU type

Shape code Dimensions (mm)

A B C D nom. E min. F H

RU1116A 11.20±0.2 08.05±0.1004.00±0.1012.50 04.50 05.50±0.2105.00±0.20

RU1728A 16.60±0.4 13.60±0.3006.00±0.2013.00 07.30 10.65±0.15 10.00±0.30

RU2027A 20.30±0.5 13.60±0.5008.00±0.3015.00 07.00 08.60±0.3010.00±0.30

RU2953A 28.70±0.5 26.50±0.2008.60±0.2006.80 12.80 19.30±0.2008.60±0.20

RU-26 25.65±0.4 09.70±0.3009.50±0.3003.90 11.75 05.70±0.3117.80±0.30

RU2749A 27.30±0.4 24.50±0.3010.00±0.2017.10 09.80 17.30±0.3110.00±0.20

RU-30DB 30.50±0.5 31.35±0.2010.00±0.2008.15 11.70 22.85±0.25 10.00±0.20

RU3060B 30.40±0.5 30.00±0.25 10.00±0.25 18.15 11.70 21.60±0.25 10.00±0.20

RU3054A 30.40±0.5 27.00±0.3010.00±0.3018.15 11.75 18.60±0.3110.30±0.30

RU3659A 35.50±0.5 29.30±0.3011.00±0.3009.00 15.20 20.30±0.3111.00±0.30

RU3561A 34.50±0.5 30.30±0.3011.00±0.3008.70 14.30 21.30±0.3111.00±0.30

RU3261A 31.50±0.4 30.50±0.3011.00±0.3007.50 12.60 20.50±0.3111.00±0.30

RU3258B 32.00±0.4 29.00±0.3011.40±0.3008.20 12.00 19.20±0.3011.40±0.30

RU3762B 37.10±0.5 30.80±0.3011.50±0.3010.25 14.85 21.00±0.3111.50±0.30

RU3465A 34.30±0.5 32.30±0.3012.00±0.25 08.00 14.00 23.30±0.25 12.00±0.25

RU3654A 36.10±0.5 27.20±0.3012.00±0.3009.30 14.30 17.70±0.3112.00±0.30

RU4068A 39.75±0.5 34.00±0.25 12.00±0.3009.00 18.25 25.00±0.25 12.00±0.30

RU3770A 37.00±0.6 34.95±0.3012.00±0.3008.40 16.00 24.55±0.3112.00±0.30

RU3763D 36.60±0.5 31.50±0.3012.00±0.3009.90 14.20 21.70±0.3112.00±0.30

RU3662A 36.20±0.5 30.90±0.3012.00±0.3009.40 14.30 21.50±0.3112.00±0.30

RU3568A 35.00±0.5 33.80±0.3012.50±0.3008.50 13.50 23.80±0.3112.50±0.30

RU-36NL 36.15±0.5 24.60±0.3012.50±0.3008.00 15.15 16.60±0.3112.50±0.30

RU3754B 37.00±0.5 27.00±0.3012.50±0.3007.85 16.15 18.60±0.3112.50±0.30

RU-36HM 35.25±0.5 34.30±0.5012.70±0.2009.30 13.20 24.00±0.5112.70±0.20

RU3560C 35.05±0.5 30.30±0.3012.70±0.3009.30 13.05 20.00±0.3112.70±0.30

RU3661A 35.80±0.5 30.50±0.3013.00±0.25 10.50 12.00 20.00±0.25 13.00±0.25

RU3563A 35.40±0.5 31.50±0.3013.00±0.25 10.00 11.90 21.50±0.2113.00±0.30

RU3763SU 37.00±0.4 31.50±0.3013.00±0.25 08.50 15.00 21.50±0.25 13.00±0.25

RU4263C 42.05±0.5 31.50±0.3013.00±0.3010.70 17.85 20.80±0.3113.00±0.30

RU3461A 33.50±0.4 30.50±0.3013.00±0.3008.50 11.60 20.50±0.3113.00±0.30

RU-35DA 35.40±0.5 27.50±0.3013.00±0.3010.00 11.90 17.50±0.3113.00±0.30

RU4266A 41.85±0.5 32.60±0.3013.00±0.3010.70 17.65 21.90±0.3113.00±0.30

RU3762A 36.90±0.5 31.10±0.3013.00±0.3010.20 13.20 20.90±0.3113.00±0.30

RU3764B 37.30±0.5 31.80±0.3013.00±0.3009.70 14.10 22.10±0.3113.00±0.30

RU3877A 38.30±0.5 38.90±0.3013.00±0.3010.70 14.10 28.40±0.3113.00±0.30

RU3868C 38.00±0.5 34.20±0.3013.00±0.3010.70 13.80 23.50±0.3113.00±0.30

RU3671A 35.85±0.5 35.55±0.25 13.50±0.3008.90 12.95 25.40±0.25 13.50±0.30

RU4266C 42.35±0.5 33.00±0.3014.00±0.3011.10 16.65 21.50±0.3114.00±0.30

RU3663A 36.40±0.5 31.50±0.3014.00±0.3010.10 11.80 21.40±0.3114.00±0.30

RU4072A 40.00±0.5 36.10±0.3014.00±0.3011.50 14.10 24.30±0.3114.00±0.30

RU4382A 43.00±0.5 41.00±0.3014.00±0.3011.50 17.00 30.00±0.3114.00±0.30

RU4270A 42.35±0.6 35.00±0.3014.00±0.3011.10 16.65 23.50±0.3114.00±0.30

http://www.fdk.co.jp

●RU type

Core constant

Shape code Ae (mm2) le (mm) Ve (mm3)Core weight (g/set)

RU1116A 12.30 040.6 00499 002.50

RU1728A 28.20 069.0 01950 010.00

RU2027A 49.50 067.1 03320 017.30

RU2953A 58.20 128.8 07500 036.70

RU-26 70.00 062.2 04350 022.90

RU2749A 70.40 113.8 08010 040.40

RU-30DB 78.50 143.5 11300 054.60

RU3060B 77.00 138.3 10600 052.00

RU3054A 81.10 126.3 10240 050.90

RU3659A 92.90 142.3 13220 065.70

RU3561A 95.15 144.4 13740 069.70

RU3261A 89.46 136.7 12230 063.40

RU3258B 89.40 131.0 11700 061.20

RU3762B 106.00 147.0 15580 078.90

RU3465A 104.60 150.9 15780 079.50

RU3654A 108.00 131.9 14250 071.40

RU4068A 104.80 167.7 17570 087.60

RU3770A 108.90 162.7 17720 090.90

RU3763D 112.40 148.8 16730 080.00

RU3662A 111.70 147.2 16440 092.60

RU3568A 112.00 154.3 17300 087.00

RU-36NL 100.00 124.8 12500 063.70

RU3754B 104.00 135.6 14200 073.00

RU-36HM 120.00 151.6 18700 093.60

RU3560C 120.00 138.9 16670 084.00

RU3661A 130.50 138.9 18130 092.00

RU3563A 128.00 145.0 18560 092.90

RU3763SU 118.20 148.2 17520 091.70

RU4263C 133.00 156.1 20800 102.00

RU3461A 116.20 137.2 15900 084.00

RU-35DA 128.00 129.0 16500 083.40

RU4266A 132.00 159.3 21000 107.00

RU3762A 133.00 145.2 19300 097.00

RU3764B 119.00 150.0 17900 090.00

RU3877A 132.00 177.9 23500 116.00

RU3868C 132.00 158.0 20900 103.00

RU3671A 126.00 161.1 20300 102.00

RU4266C 155.10 158.3 24550 121.90

RU3663A 140.80 144.5 20350 103.00

RU4072A 156.00 162.7 25400 126.00

RU4382A 150.00 192.0 28800 141.00

RU4270A 155.00 166.3 25800 128.00

http://www.fdk.co.jp

●RU type

RU-42MS 42.75±0.5031.50±0.3 14.00±0.3 11.50 16.75 20.00±0.3 14.00±0.3

RU-40C 40.00±0.5030.20±0.3 14.00±0.3 11.50 14.10 18.40±0.3 14.00±0.3

RU3866Z 38.50±0.5032.80±0.3 14.00±0.3 10.50 13.50 21.70±0.3 14.00±0.3

RU3864B 37.50±0.5032.10±0.5 14.00±0.3 10.50 12.70 21.30±0.3 14.00±0.2

RU4168A 40.80±0.5034.00±0.3 14.50±0.3 12.20 13.80 22.00±0.3 14.50±0.3

RU-40DA 40.05±0.5031.10±0.3 14.50±0.3 11.50 13.55 20.10±0.3 14.50±0.3

RU3763E 36.75±0.4031.50±0.3 14.50±0.3 09.50 12.40 20.50±0.3 14.50±0.3

RU4280A 42.30±0.5040.40±0.3 15.00±0.3 11.80 15.00 28.40±0.3 15.00±0.3

RU4058A 39.80±0.5029.20±0.3 15.00±0.3 11.50 12.80 17.70±0.3 15.00±0.3

RU4676A 46.00±0.8038.00±0.3 15.00±0.3 12.00 18.50 26.00±0.3 15.00±0.3

RU4279A 42.00±0.5039.45±0.3 15.00±0.3 11.00 15.50 27.45±0.3 15.00±0.3

RU4375B 42.80±0.5037.55±0.3 15.00±0.3 11.80 15.50 25.55±0.3 15.00±0.3

RU4066A 40.00±0.5033.00±0.3 15.00±0.3 11.50 13.20 21.50±0.3 15.00±0.3

RU-41E 41.60±0.5037.00±0.3 15.00±0.3 11.80 14.30 25.00±0.3 15.00±0.3

RU4173A 41.50±0.5036.50±0.3 15.00±0.3 11.50 14.50 25.00±0.3 15.00±0.3

RU4174A 40.70±0.5036.80±0.3 15.00±0.3 18.70 16.50 27.50±0.3 16.50±0.3

RU4067C 40.25±0.5033.60±0.3 15.00±0.3 10.40 14.35 24.00±0.3 15.00±0.3

RU4567B 44.50±0.5033.25±0.3 15.00±0.3 11.50 17.60 21.60±0.3 15.00±0.3

RU-46MA 46.00±0.6036.65±0.3 15.00±0.3 12.00 18.40 24.55±0.3 15.00±0.3

RU4573A 45.40±0.5036.50±0.3 15.00±0.3 11.40 18.40 25.10±0.3 15.00±0.3

RU-42G 42.40±0.5036.00±0.3 15.50±0.3 12.50 13.90 23.20±0.3 15.50±0.3

RU4570A 44.50±0.5035.00±0.3 16.00±0.3 12.00 16.00 22.80±0.3 16.00±0.3

RU-49A 48.50±0.6038.30±0.3 16.00±0.3 13.00 18.90 25.00±0.3 16.00±0.3

RU4373A 43.20±0.5036.60±0.3 16.00±0.3 12.00 14.40 24.60±0.3 16.00±0.3

RU4370A 43.10±0.5035.10±0.3 16.50±0.3 12.50 13.70 24.00±0.3 16.50±0.3

RU4776A 46.55±0.5038.00±0.3 16.50±0.3 12.80 16.80 25.00±0.3 16.50±0.3

RU4582A 45.60±0.5041.00±0.3 16.50±0.3 12.80 15.90 28.00±0.3 16.50±0.3

RU-43D 43.40±0.5038.00±0.3 16.50±0.3 12.80 13.70 25.00±0.3 16.50±0.3

RU4478A 44.15±0.5038.75±0.3 16.50±0.3 11.40 15.75 27.50±0.3 16.50±0.3

RU4569A 45.10±0.5034.70±0.3 16.70±0.3 13.10 14.80 21.60±0.3 16.70±0.3

RU4677A 45.85±0.5038.55±0.3 16.70±0.3 13.80 14.80 24.55±0.3 16.70±0.3

RU-51MS 50.70±0.65 38.55±0.3 16.70±0.3 13.80 19.55 24.55±0.3 16.70±0.3

RU4676C 45.50±0.6038.20±0.3 17.00±0.3 13.00 14.90 25.20±0.3 17.00±0.3

RU-46D 46.30±0.5038.00±0.3 17.00±0.3 13.30 15.50 25.00±0.3 25.00±0.3

RU4661A 45.60±0.5030.50±0.3 17.50±0.3 13.00 14.60 17.50±0.3 17.50±0.3

RU4879A 48.40±0.6039.30±0.3 18.00±0.3 14.50 15.50 24.50±0.3 18.00±0.3

http://www.fdk.co.jp

RU-42MS 154.00 152.6 23500 119.00

RU-40C 156.00 140.3 21900 109.00

RU3866Z 146.00 151.2 22100 110.00

RU3864B 143.00 146.6 21000 105.00

RU4168A 164.00 156.2 25600 127.00

RU-40DA 159.00 146.1 23200 116.00

RU3763E 148.10 142.7 21130 109.10

RU4280A 172.00 184.4 31700 158.00

RU4058A 172.50 136.2 23490 120.00

RU4676A 170.00 181.9 30900 152.00

RU4279A 168.00 180.9 30400 152.00

RU4375B 172.90 174.0 30090 149.70

RU4066A 132.00 159.3 21000 128.00

RU-41E 173.00 169.5 29300 147.00

RU4173A 172.00 168.9 29100 137.00

RU4174A 155.00 175.9 27300 138.00

RU4067C 167.90 161.0 27030 133.50

RU4567B 165.00 161.2 26600 135.00

RU-46MA 172.00 175.6 30200 150.00

RU4573A 173.00 177.0 30600 152.00

RU-42G 190.00 163.7 31100 153.00

RU4570A 188.00 165.0 31000 156.00

RU-49A 196.00 195.2 38300 181.00

RU4373A 188.00 169.3 31800 161.00

RU4370A 199.70 164.3 32810 164.70

RU4776A 205.00 177.8 36400 181.00

RU4582A 206.00 187.9 38700 193.00

RU-43D 207.00 171.5 35500 178.00

RU4478A 194.00 181.4 35200 175.00

RU4569A 216.00 159.5 34500 175.00

RU4677A 219.00 174.5 38200 188.00

RU-51MS 219.00 184.0 40300 198.00

RU4676C 222.00 175.7 39000 198.00

RU-46D 217.00 176.0 38200 191.00

RU4661A 223.00 145.0 32340 161.00

RU4879A 260.00 178.5 46400 225.00

●RU type

http://www.fdk.co.jp

ROTARY TRANSFORMERS

In VCRs, high-frequency video signals are recorded

on, and replayed from a magnetic tape by a high-

speed revolving drum equipped with a magnetic

head. The rotary transformer is fitted onto this

revolving drum to transmit the high-frequency sig-

nals without distortion from the rotor to the stator.

The use of rotary transformers is now extending to

DAT (digital audio tape), DVC (digital video camera)

and D-VHS.

Contents Page

■

Standard characteristics and product list of FDK rotary transformers

....17

■Naming of rotary transformer models ...............................................17

■Standard materials for rotary transformer ferrite cores .....................18

■Working mechanism of rotary transformers ......................................18

■Electric circuits of rotary transformers...............................................18

■2-channel rotary transformers for console VCR................................19

■4-channel rotary transformers for console VCR................................19

■6-channel rotary transformers for console VCR (Hi-Fi).....................20

■7-channel rotary transformers for console VCR (S-VHS) .................20

■8-channel rotary transformers for console VCR (D-VHS) .................21

■

Disk-shaped 5-channel rotary transformers for camcorder VCR (VHS-C)

...21

■2-channel rotary transformers for DVC .............................................22

■4-channel rotary transformers for DAT..............................................22

http://www.fdk.co.jp

RT 36 08 R-6 A

Rev.

No. of channels

Rotor

Inner diameter

Outer diameter

Rotary transformer

■

Standard characteristics and product list of FDK rotary transformers

●Taking full advantage of its long experience as an inte-

grated ferrite maker, FDK selects only the most suitable

ferrite materials for rotary transformers.

●FDK rotary transformers incorporate cores with an out-

standing dimensional precision backed by sophisticated

processing and production technologies. FDK’s high

quality rotary transformers are mass-produced in over-

seas factories.

●Upon the request of customers, FDK promptly designs

and produces test sample products.

* FDK’s product development and design services for

customers are aided by a supercomputer simulation

system to ensure that the exact needs of each cus-

tomer are fully met.

■Naming of rotary transformer models

●Naming of core models ●Naming of assembled models

S: stator

C: common to rotor and stator

()

RT A 36 36 R-6 A

Rev.

No. of channels

Rotor (S: stator)

Outer diameter of stator

Outer diameter of rotor

Assembly

Rotary transformer

Applications Specification

No. of channels

Model type

Standard 2CH RTA2525R/S-2A type

Standard 4CH RTA2929R/S-4A type

Console VCR Hi-Fi 6CH RTA3636R/S-6A type

S-VHS 7CH RTA4040R/S-7A type

Standard D-VHS 8CH RTA5656R/S-8A type

Camcorder VCR

NORMAL 5CH RTA3838R/S-5A type

DVC 2CH RTA1818R/S-2A type

DAT DDS 4CH RTA2626R/S-4A type

http://www.fdk.co.jp

■Standard materials for rotary transformer ferrite cores

Characteristic Unit L52H L52R L52S L52M

Initial permeability µiac —500 690 1200 1900

Coercivity Hc A/m 24 32 32 16

αµr ×10–63~10 3~10 4~12 3~8

Resistivity ρΩ·cm >108>108>108>108

Bs mT 280 310 310 300

Br mT 130 110 160 120

Curie temperature Tc °C >130 >130 >130 >110

Range frequency f Hz 1K~10M 1K~10M 1K~10M 1K~10M

■Working mechanism of rotary transformers

Rotary transformers are designed to transmit electric signals

from a rotating body to a fixed body, or from a fixed body to a

rotating body. In this regards, (a) it is not possible to use lead

wires to transmit electric signals between a rotating and a fixed

body; (b) although theoretically possible, if a spring and brush

used in motors are applied to this task, noise problems will arise

due to the very weak signals and a very high MHz-level fre-

quency involved.

Consequently, a rotary transformer was created, which could

transmit magnetic fields generated between a rotor and a sta-

tor, through a ferrite material (see righthand diagram). In this

diagram, the performance of the magnetic circuit depends

almost totally on the precision of the air gap. In conventional

VCRs, the air gap is set between 30µm and 50µm.

(to head)

(to VCR)

Air gap

Magnetic circuit

Coil

Rotor

Stator

Cross section of rotary transformer

■Electric circuits of rotary transformers

The righthand diagram shows the electric circuit of a revolving

magnetic head drum for VCRs, and each VCR incorporates as

many electric circuits of this type as needed to match the num-

ber of television channels. These electric circuits have the fol-

lowing characteristics:

qIf the coupling coefficient is 1, the power on the rotor side

and the power on the stator side are considered equal.

wThe ratio of the voltages applied to the both ends of the

rotary transformer is identical to the winding ratio.

eThe values shown in the righthand diagram were measured

when the VCR was in the recording mode. The values would

be even smaller for the replay mode.

rThe voltage, current and power values shown in the right-

hand diagram vary somewhat, depending on the frequencies

and models of rotary transformers involved.

Winding ratio of rotary transformer 1:n (nomally 1:2)

Electric circuit diagram

Rotary transformer

Magnetic head Amplifier

L1 L2

3µW

1H 20mA

EH 150µV 150µV×n

AC temperature

coefficient

Saturation magnetic

flux density

Residual magnetic

flux density

http://www.fdk.co.jp

■2-channel rotary transformers for console VCR

CH-1

CH-2

φ24.8±0.2

φ8.3±0.10

φ24.8±0.2

φ8.3±0.1

1.85±0.01

Unit=mm

Rotor side transformer Stator side transformer

Shape example (RTA2525R/S-2A type)

These are standard rotary transformers for

2-channel video recording and replay.

Features

●A high quality and a low price made

possible by advanced technologies.

Characteristics

Channel

Combinational Leakage

Coupling

Note

inductance inductance

coefficient

1 60µH 2.1µH 0.98

gap=38µm

2 63µH 3.2µH 0.97

f=1.0MHz

■4-channel rotary transformers for console VCR

CH-2

CH-1

CH-4

CH-3

CH-1

CH-4

CH-3

φ28.8±0.25

φ8.3±0.10

φ28.8±0.25

φ8.3±0.10

1.85±0.01

Unit=mm

Rotor side transformer Stator side transformer

Shape example (RTA 2929R/S-4A type)

These are standard rotary transformers for

4-channel video recording and replay.

Features

●Stable characteristics ensured by the

use of high-quality ferrites.

Characteristics

Channel

Combinational Leakage

Coupling

Note

inductance inductance

coefficient

1 27µH 1.8µH 0.96

2 27µH 2.2µH 0.96

gap=38µm

3 27µH 2.5µH 0.95

f=1.0MHz

4 27µH 2.7µH 0.95

http://www.fdk.co.jp

■6-channel rotary transformers for console VCR (Hi-Fi)

Shape example (RTA 3131R/S-6A type) Features

●A stable signal transmission throughout

a low to high (several KHz to several

MHz) frequency range due to the use of

high-quality ferrites.

Characteristics

Channel

Combinational Leakage

Coupling

Note

inductance inductance

coefficient

1 21µH 1.8µH 0.96

2 21µH 2.0µH 0.95

3 21µH 2.2µH 0.95

gap=30µm

4 21µH 2.4µH 0.94

f=1.0MHz

5 31µH 3.3µH 0.95

6 31µH 3.3µH 0.95

■7-channel rotary transformers for console VCR (S-VHS)

CH-5

CH-6

CH-2

CH-4

CH-7

CH-3 CH-1

φ39.6±0.20

φ8.27±0.07

1.85±0.01

CH-6

CH-7

CH-5

CH-4

CH-1

CH-2

CH-3

φ39.6±0.20

φ8.27±0.07

Unit=mm

Rotor side transformer Stator side transformer

Shape example (RTA 4040R/S-7A type) Features

●Improved characteristics obtained by the

use of a high-performance ferrite with a

high permeability and a low loss.

●Self-resonance frequency raised to near

the 10 MHz level.

Characteristics

Channel

Combinational Leakage

Coupling

Note

inductance inductance

coefficient

1 23µH 3.1µH 0.93

2 23µH 3.1µH 0.93

3 23µH 3.1µH 0.93

gap=38µm

4 23µH 3.1µH 0.93

f=1.0MHz

5 40µH 5.0µH 0.93

645µH 0.9µH 0.90

7 40µH 5.0µH 0.93

Rotor side transformer Stator side transformer

CH-3

CH-1

CH-6

1.85±0.01

CH-4

CH-2

CH-4

φ30.6±0.15

φ8.27±0.07

φ30.6±0.15

φ8.27±0.07

CH-5

Unit=mm

http://www.fdk.co.jp

■8-channel rotary transformers for console VCR (D-VHS)

CH-5

CH-4

CH-3

CH-7

CH-8

CH-1

CH-6

CH-2

φ56 0

-0.15

φ18 +0.15

+0.05

CH-4

CH-7

CH-2

CH-3

CH-5

CH-8 CH-1

CH-6

56 0

-0.15

2.7 0

-0.04

2.7 0

-0.04

+0.15

+0.05

φ18

Rotor side transformer Stator side transformer

Unit=mm

Shape example (RTA 5656R/S-8A type) Features

●Stable transmission characteristics

achieved in the low to high range (several

kHz to several MHz) by using high-quality

ferrites.

●Dimensional accuracy enhanced by apply-

ing advanced processing techniques.

●Minimized inter-channel variation of

characteristics.

Characteristics

■

Disk-Shaped 5-channel rotary transformers for camcorder VCR (VHS-C)

Shape example (RTA3131R/S-5A type) Features

●Use of strongly magnetic ferrite materials

suitable for high-precision grinding work

to carve channel grooves.

●

Suitable for compact, lightweight camcorders.

Characteristics

Channel

Combinational Leakage

Coupling

Note

inductance inductance

coefficient

1 27µH 2.3µH 0.96

2 29µH 2.6µH 0.95

gap=30µm

3 29µH 2.6µH 0.95

f=1.0MHz

4 27µH 2.9µH 0.94

5 3.5µH 0.6µH 0.91

Channel

Combinational Leakage

Coupling

Note

inductance inductance

coefficient

1 24µH 2.5µH 0.94

2 24µH 2.5µH 0.94

3 31µH 4.0µH 0.93

gap=50µm

4 31µH 4.0µH 0.93

5 31µH 4.0µH 0.93

f=1.0MHz

6 31µH 4.0µH 0.93

7 45µH 4.5µH 0.95

8 45µH 4.5µH 0.95

1.5±0.01

φ30.6±0.21

φ9.5+0.2

CH-4

CH-1

CH-5

CH-3

CH-2

Rotor side transformer Stator side transformer

CH-4

CH-2

CH-5 CH-1

CH-3

S.R

Unit=mm

1.5±0.01

φ9.5

φ30.6±0.21

+0.2

http://www.fdk.co.jp

■2-channel rotary transformers for DVC

CH-1

CH-2

1.2±0.01

φ7±0.05

φ18.3±0.13 φ18.3±0.13

1.2±0.01

YX0

Rotor side transformer Stator side transformer

Unit=mm

Shape example (RTA1818R/S-2A type) Features

●High performance and quality achieved by

using low-loss, high-permeability and high-

resistivity ferrites.

●High-precision, lightweight and compact

transformers to match DVC.

Characteristics

■4-channel rotary transformers for DAT

CH-4

CH-2

CH-3

CH-4

CH-3

CH-2

CH-1

1.4±0.01

YX0

φ26.2±0.10

φ9.15+0.05

–0.04

φ26.2±0.10

φ9.15+0.05

–0.04

CH-4

S.R

CH-3

CH-2

CH-1

CH-2

CH-3

S.R

CH-4

Unit=mm

Rotor side transformer Stator side transformer

Shape example (RTA2626R/S-4A type) Features

●A high performance and a high quality

obtained by the use of low-loss, high-per-

meability and high-resistivity ferrite mate-

rials.

●Light, compact rotary transformers with

precision dimensions matching the deli-

cate shapes of R-DAT recorders.

Channel

Combinational Leakage

Coupling

Note

inductance inductance

coefficient

1 4.5µH 0.3µH 0.97

gap=30µm

2 4.5µH 0.3µH 0.97

f=1.0MHz

http://www.fdk.co.jp

For improvement of its products, FDK reserves the right to change specifications

without prior notice to customers.

Electronics sales Div.

5-36-11, Shinbashi, Minato-ku, Tokyo 105-8677, Japan (Hamagomu Bldg.)

TEL: (81)-3-5473-4683 FAX: (81)-3-3431-9436

U.S.A. FDK AMERICA, INC. CORPORATE OFFICE

2270 North First Street, San Jose, California 95131-2022, U.S.A.

TEL: (1)-408-432-8331 FAX: (1)-408-435-7478

FDK AMERICA, INC. BOSTON OFFICE

411 Waverly Oaks Road, Suite 324, Waltham,

Massachusetts 02452-8437, U.S.A.

TEL: (1)-781-899-7700 FAX: (1)-781-899-7701

FDK AMERICA, INC. SAN DIEGO OFFICE

6540 Lusk Blvd Suite C274 San Diego,

California 92121-2766, U.S.A.

TEL: (1)-858-558-8368 FAX: (1)-858-558-6005

Europe FDK ELECTRONICS GMBH

Heerdter Lohweg 89, 40549 Düsseldorf, Germany

TEL: (49)-211-591574 FAX: (49)-211-593549

FDK ELECTRONICS UK LIMITED

Suite 4C Celect House 12A Fairbairn Road,

Kirkton North Livingston EH54 6TS,

Scotland, United Kingdom

TEL: (44)-1506-467981 FAX: (44)-1506-467982

Asia FDK HONG KONG LTD.

Unit 18. 15/F., Chevalier Commercial Centre, 8 Wang Hoi Road,

Kowloon Bay, Hong Kong

TEL: (852)-27999773 FAX: (852)-27554635

FDK SINGAPORE PTE., LTD.

4, Leng Kee Road, #06-07/08 SiS Building, Singapore. 159088,

Republic of Singapore

TEL: (65)-472-2328 FAX: (65)-472-5761

FDK

Web Site