1.Introduction
An NTC thermistor has to be connected in series to the power source circuit to avoid the surge current at the instant when the electronic circuits are turned on. The device can effectively suppress the surge current, and its resistance and power consumption can be greatly reduced after that through the continuous effect of the current so as not to affect the normal work current. Therefore the Power NTC thermistor is the most convenient and efficient instrument to curb the surge current and protect the electronic devices from being damaged.

2. Applications
Applicable to the protection of the power circuits of conversion power supply, switching power supply, UPS power supply, electric heaters, electronic energy-saving lamps, electronic ballasts and other electronic devices, and the filament protection of color picture tubes, incandescent lamps and other lights.



3.Characteristics:
¡¤Small size,Strong power and strong capability of surge current protection.
¡¤Characteristics Fast response to the rapidly surge.
¡¤Big material constant(B value),Small remain resistance.
¡¤Longevity of service,High reliability.
¡¤Integral series,Extensive operating range.

4.Specification:

5.Dimensions:(mm)
D
+1
-2
Tmax
d¡À0.05
F 1 ¡À1
F 2 ¡À1.5
Straight Lead Wire
Curved Lead Wire
Lmin
b
L 1 min
L 2 ¡À2
MF72-¡õD5
6.5
5
0.6/0.45
5/2.5
3
25
17/5
8
MF72-¡õD7
8.5
5
0.6
5
3
25
17/5
8
MF72-¡õD9
10.5
5.5
0.8/0.6
7.5/5
5/3
25
17/5
8
MF72-¡õD11
12.5
5.5
0.8
7.5/5
5/3
25
17/5
8
MF72-¡õD13
14.5
6
0.8
7.5
5
25
17/5
8
MF72-¡õD15
16.5
6
0.8
10/7.5
5
25
17/5
8
MF72-¡õD20
21.5
7
1.0
10/7.5
/
25
/
/
MF72-¡õD25
26.5
8
1.0
10
/
25
/
/
Remark
¡¡
a¡¢¡õrated zero-power resistance
¡¡ b ¡¢17/5 17 show the long bend tead wire 5 shows the short bend lead wire.
Illustration:In general,the long bend lead wire is used,name shape is II.
6.Main Techno-Parameter

Part NO.

R 25
£¨¦¸£©

Max.Steady State Current
£¨A£©

Approx.R of Max.Cur
£¨¦¸£©

Dissi,Coef.
£¨mW/¡æ£©

Thermal time Constant
£¨S£©

Operating Temp.
£¨¡æ£©
UL

MF72-5D5

5

1

0.353

6

20

-55¡«+200

 

MF72-10D5

10

0.7

0.771

6

20

 

MF72-60D5

60

0.5

1.878

6

18

 

MF72-200D5

200

0.1

6.259

6

18

 

MF72-5D7

5

2

0.283

10

30

 

MF72-8D7

8

1

0.539

9

28

   

MF72-10D7

10

1

0.616

9

27

 

MF72-12D7

12

1

0.816

9

27

 

MF72-16D7

16

0.7

1.003

9

27

 

MF72-22D7

22

0.6

1.108

9

27

 

MF72-33D7

33

0.5

1.485

10

28

 

MF72-200D7

200

0.2

6.233

11

28

 

MF72-3D9

3

4

0.120

11

35

¡Ì

MF72-4D9

4

3

0.190

11

35

¡Ì

MF72-5D9

5

3

0.210

11

34

¡Ì

MF72-6D9

6

2

0.315

11

34

¡Ì

MF72-8D9

8

2

0.400

11

32

¡Ì

MF72-10D9

10

2

0.458

11

32

¡Ì

MF72-12D9

12

1

0.652

11

32

¡Ì

MF72-16D9

16

1

0.802

11

31

¡Ì

MF72-20D9

20

1

0.864

11

30

¡Ì

MF72-22D9

22

1

0.950

11

30

¡Ì

MF72-30D9

30

1

1.022

11

30

¡Ì

MF72-33D9

33

1

1.124

11

30

¡Ì

MF72-50D9

50

1

1.252

11

30

¡Ì

MF72-60D9

60

0.8

1.502

11

30

¡Ì

MF72-80D9

80

0.8

2.010

11

30

¡Ì

MF72-120D9

120

0.8

3.015

11

30

¡Ì

MF72-200D9

200

0.5

5.007

11

32

¡Ì

MF72-400D9

400

0.2

9.852

11

32

¡Ì

MF72-2.5D11

2.5

5

0.095

13

43

 

MF72-3D11

3

5

0.100

13

43

 

MF72-4D11

4

4

0.150

13

44

 

MF72-5D11

5

4

0.156

13

45

 

MF72-6D11

6

3

0.240

13

45

 

MF72-8D11

8

3

0.255

14

47

 

MF72-10D11

10

3

0.275

14

47

 

MF72-12D11

12

2

0.462

14

48

 

MF72-16D11

16

2

0.470

14

50

 

MF72-20D11

20

2

0.512

15

52

 

MF72-22D11

22

2

0.563

15

52

 

MF72-30D11

30

1.5

0.667

15

52

 

MF72-33D11

33

1.5

0.734

15

52

 

MF72-50D11

50

1.5

1.021

15

52

 

MF72-60D11

60

1.5

1.215

15

52

 

MF72-80D11

80

1.2

1.656

15

52

¡Ì

MF72-1.3D13

1.3

7

0.062

13

60

¡Ì

MF72-1.5D13

1.5

7

0.073

13

60

¡Ì

MF72-2.5D13

2.5

6

0.088

13

60

¡Ì

MF72-3D13

3

6

0.092

14

60

¡Ì

MF72-4D13

4

5

0.120

15

67

¡Ì

MF72-5D13

5

5

0.125

15

68

¡Ì

MF72-6D13

6

4

0.170

15

65

¡Ì

MF72-7D13

7

4

0.188

15

65

¡Ì

MF72-8D13

8

4

0.194

15

60

¡Ì

MF72-10D13

10

4

0.206

15

65

¡Ì

MF72-12D13

12

3

0.316

16

65

¡Ì

MF72-15D13

15

3

0.335

16

60

¡Ì

MF72-16D13

16

3

0.338

16

60

¡Ì

MF72-20D13

20

3

0.372

16

65

¡Ì

MF72-30D13

30

2.5

0.517

16

65

¡Ì

MF72-47D13

47

2

0.810

17

65

¡Ì

MF72-120D13

120

1.5

2.124

16

65

¡Ì

MF72-1.3D15

1.3

8

0.048

18

68

¡Ì

MF72-1.5D15

1.5

8

0.052

19

69

¡Ì

MF72-3D15

3

7

0.075

18

76

¡Ì

MF72-5D15

5

6

0.112

20

76

¡Ì

MF72-6D15

6

5

0.155

20

80

¡Ì

MF72-7D15

7

5

0.173

20

80

¡Ì

MF72-8D15

9

5

0.178

20

80

¡Ì

MF72-10D15

10

5

0.180

20

75

¡Ì 

MF72-12D15

12

4

0.250

20

75

¡Ì

MF72-15D15

15

4

0.268

21

85

¡Ì

MF72-16D15

16

4

0.276

21

70

¡Ì

MF72-20D15

20

4

0.288

17

86

¡Ì

MF72-30D15

30

3.5

0.438

18

75

¡Ì

MF72-47D15

47

3

0.680

21

86

¡Ì

MF72-120D15

120

2.5

1.652

22

87

¡Ì

MF72-0.7D20

0.7

12

0.018

25

112

¡Ì

MF72-1.3D20

1.3

9

0.037

24

113

¡Ì

MF72-3D20

3

8

0.055

24

113

¡Ì

MF72-5D20

5

7

0.087

23

112

¡Ì

MF72-6D20

6

6

0.113

25

114

¡Ì

MF72-8D20

8

6

0.142

25

115

¡Ì

MF72-10D20

10

6

0.162

24

113

¡Ì

MF72-12D20

12

5

0.195

24

114

¡Ì

MF72-16D20

16

5

0.212

25

113

¡Ì

MF72-0.7D25

0.7

13

0.014

30

151

 

MF72-1.5D25

1.5

10

0.027

30

152

 

MF72-3D25

3

9

0.044

32

150

 

MF72-5D25

5

8

0.070

32

151

 

MF72-8D25

8

7

0.114

33

151

 

MF72-10D25

10

7

0.130

32

150

 

MF72-12D25

12

6

0.156

32

150

 

MF72-16D25

16

6

0.160

35

152
 

Add: 179-1 Shuanglong Road,
         Chalu Town, Jiangning
         District, Nanjing
Postal Code: 211101
Marketing Department:
         025-52105493
Switchboard: 025-52121898
                         025-52121868
Fax: 025-52122373
E-mail:sales@shiheng.com.cn
            shi-heng@vip.163.com

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