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POLYSWITCH RESETTABLE

DEVICES

Radial-Leaded Devices

products available in the industry today.

• RGEF series for hold currents up to 14A

• RHEF series for flatter thermal derating and operating

temperatures up to 125°C

• RUEF series for balance of voltage rating (30V) and

hold current (up to 9A)

• RUSBF series for fast time-to-trip and low-resistance

computer applications

• RXEF series for low hold currents (down to 50mA)

and high voltage rating (up to 72V)

• RKEF series for balance of voltage rating (60V) and

hold current (up to 5A)

• Now offering halogen free versions of all products

Littelfuse’s PolySwitch radial-leaded products represent

the most comprehensive and complete set of PPTC

BENEFITS

• Many product choices help provide engineers more

design flexibility

• Compatible with high-volume electronics assembly

• Assists in meeting regulatory requirements

• Higher voltage ratings allow use in new applications

APPLICATIONS

• Satellite video receivers

• Industrial controls

• Transformers

• Modems

• CD-ROMs

• Game machines

• Phones

• Fax machines

• Analog and digital line cards

• Printers

• Intelligent appliance

• Robotic machine

• Power supply

• Security

• Lighting

• Medical application

FEATURES

• RoHS compliant

• Halogen free

(refers to: Br

≥

900ppm, Cl

≥

900ppm, Br+Cl

≥

1500ppm)

• Broadest range of radial-leaded resettable devices

available in the industry

• Current ratings from 50mA to 15A

• Voltage ratings from 6V (computer and electronic

applications) to 72V

• Agency recognition : UL, CSA, TÜV, CQC**

• Fast time-to-trip

• Low resistance

**CQC only applies to RXEF, RUEF family parts

RoHS Compliant, ELV Compliant

Halogen Free

154

PolySwitch Resettable Devices

Radial-Leaded Devices

Application Selection Guide

The guide below lists PolySwitch radial-leaded devices that are typically used in each of the applications described.

Specifications for the suggested device part numbers can be found in this section.

Once a part number has been selected, the user should evaluate and test each product for its intended application.

Protection Application

Electromagnetic Loads

Halogen Lighting

Lighting Ballast

Loudspeakers

Medical Equipment

MOSFET Devices

Motors, Fans and Blowers

POS Equipment

Process and Industrial Controls

Satellite Video Receivers

Security and Fire Alarm Systems

Test and Measurement Equipment

Transformers

DDC Computer and Consumer Electronics

Mouse and Keyboard

SCSI

USB

Traces and Printed Circuit Board Protection

PolySwitch Resettable Devices — Key Selection Criteria

Small Size

RGEF (<16V), RUEF (<30V)

RXEF (<72V)

RGEF (<16V), RUEF (<30V)

RXEF (<72V), RGEF (<16V)

RXEF (<72V), RUEF (<30V)

RGEF (<16V), RUEF (<30V)

RUEF (<30V)

RUSBF (<16V)

RGEF (<16V), RUEF (<30V)

RHEF (<16V)

RXEF (<72V), RKEF (<60V)

RHEF (<16V)

RXEF (<72V), RKEF (<60V)

RHEF (<16V)

RXEF (<72V), RKEF (<60V)

Flatter Derating

RHEF (<16V)

Lower Current Higher Voltage

RXEF (<72V), RKEF (<60V)

Note :

This list is not exhaustive. Littelfuse welcomes customer input for additional application ideas for PolySwitch resettable devices.

Table R1 — Product Series - Current Rating, Voltage Rating/Typical Resistance

Voltage Rating

Hold Current (A)

0.050

0.100

0.170

0.200

0.250

0.300

0.400

0.500

0.550

0.650

0.700

0.750

0.900

1.000

1.100

1.200

1.350

1.550

1.600

1.850

1.900

—

2.290Ω

1.600Ω

1.110Ω

0.710Ω

0.640Ω

—

0.400Ω

—

0.325Ω

0.255Ω

—

0.200Ω

—

0.155Ω

—

0.115Ω

0.100Ω

—

0.425Ω

—

0.350Ω

—

0.295Ω

0.255Ω

—

0.225Ω

—

0.165Ω

—

0.150Ω

0.106Ω

—

9.20Ω

3.50Ω

4.30Ω

—

0.095Ω

—

0.075Ω

—

0.060Ω

—

0.050Ω

0.045Ω

—

0.68Ω

—

0.42Ω

—

0.24Ω

—

0.100Ω

—

0.075Ω

—

0.060Ω

—

0.050Ω

0.045Ω

—

0.140Ω

—

0.080Ω

—

0.058Ω

—

RXEF

72V

RKEF

60V

RXEF

60V

RUEF

30V

RGEF

16V

RHEF

16V

RHEF

30V

RUSBF

16V

RUSBF

155

Halogen Free

RoHS Compliant, ELV Compliant

PolySwitch Resettable Devices

Radial-Leaded Devices

Table R1 — Product Series - Current Rating, Voltage Rating/Typical Resistance

RXEF

Voltage Rating

Hold Current (A)

2.000

2.500

3.000

3.750

4.000

4.500

5.000

5.500

6.000

6.500

.000

.500

8.000

9.000

10.00

11.00

12.00

13.00

14.00

15.00

—

0.065Ω

0.050Ω

0.040Ω

—

0.063Ω

0.040Ω

0.029Ω

0.026Ω

—

0.021Ω

—

0.030Ω

0.035Ω

—

0.020Ω

—

0.020Ω

—

0.013Ω

—

0.013Ω

—

0.013Ω

0.008Ω

—

0.0380Ω

0.0514Ω

—

0.0300Ω

—

0.0192Ω

—

0.0145Ω

—

0.0105Ω

—

0.0086Ω

0.0070Ω

0.0056Ω

0.0050Ω

0.0046Ω

—

0.0040Ω

—

0.0610Ω

—

0.0430Ω

—

0.0320Ω

0.0290Ω

—

0.0200Ω

0.0175Ω

0.0144Ω

0.0132Ω

0.0120Ω

0.0110Ω

0.0100Ω

0.0083Ω

0.0073Ω

—

0.0055Ω

0.0050Ω

—

0.030Ω

—

72V

RKEF

60V

RXEF

60V

RUEF

30V

RGEF

16V

RHEF

16V

RHEF

30V

RUSBF

16V

(Cont’d)

RUSBF

Table R2 — Thermal Derating [Hold Current (A) at Ambient Temperature (°C)]

Part

Number

RXEF

60V

RXEF005

RXEF010

RXEF017

RXEF

72V

RXEF020

RXEF025

RXEF030

RXEF040

RXEF050

RXEF065

RXEF075

RXEF090

RXEF110

RXEF135

RXEF160

RXEF185

RXEF250

RXEF300

RXEF375

0.31

0.39

0.47

0.62

0.78

1.01

1.16

1.40

1.71

2.09

2.48

2.87

3.88

4.65

5.81

0.27

0.34

0.41

0.54

0.68

0.88

1.02

1.22

1.50

1.84

2.18

2.52

3.40

4.08

5.10

0.24

0.30

0.36

0.48

0.60

0.77

0.89

1.07

1.31

1.61

1.90

2.20

2.98

3.57

4.46

0.20

0.25

0.30

0.40

0.50

0.65

0.75

0.90

1.10

1.35

1.60

1.85

2.50

3.00

3.75

0.19

0.24

0.29

0.38

0.48

0.62

0.72

0.86

1.06

1.30

1.54

1.78

2.40

2.88

3.60

0.16

0.20

0.24

0.32

0.41

0.53

0.61

0.73

0.89

1.09

1.30

1.50

2.03

2.43

3.04

0.14

0.18

0.22

0.29

0.36

0.47

0.54

0.65

0.79

0.97

1.15

1.33

1.80

2.16

2.70

0.13

0.16

0.20

0.25

0.32

0.41

0.47

0.57

0.69

0.85

1.01

1.17

1.58

1.89

2.36

0.11

0.14

0.16

0.22

0.27

0.35

0.41

0.49

0.59

0.73

0.86

1.00

1.35

1.62

2.03

0.08

0.10

0.12

0.16

0.20

0.26

0.30

0.36

0.44

0.54

0.64

0.74

1.00

1.20

1.50

—

0.078

0.160

0.260

0.068

0.140

0.230

0.06

0.11

0.21

0.05

0.10

0.17

0.048

0.096

0.160

0.04

0.08

0.14

0.035

0.072

0.120

0.032

0.067

0.110

0.027

0.050

0.090

0.02

0.04

0.07

—

-40°C

-20°C

0°C

20°C

Maximum Ambient Temperature

25°C

40°C

50°C

60°C

70°C

85°C

125°C

RoHS Compliant, ELV Compliant

Halogen Free

PolySwitch Resettable Devices

Radial-Leaded Devices

Table R2 — Thermal Derating [Hold Current (A) at Ambient Temperature (°C)]

Part

Number

RKEF; 60V

RKEF050

RKEF065

RKEF075

RKEF090

RKEF110

RKEF135

RKEF160

RKEF185

RKEF250

RKEF300

RKEF375

RKEF400

RKEF500

RUEF; 30V

RUEF090

RUEF110

RUEF135

RUEF160

RUEF185

RUEF250

RUEF300

RUEF400

RUEF500

RUEF600

RUEF700

RUEF800

RUEF900

1.31

1.60

1.96

2.32

2.68

3.63

4.35

5.80

.25

8.70

10.15

11.60

13.05

1.17

1.43

1.76

2.08

2.41

3.25

3.90

5.20

6.50

.80

9.10

10.40

11.70

1.04

1.27

1.55

1.84

2.13

2.88

3.45

4.60

5.75

6.90

8.05

9.20

10.35

0.90

1.10

1.35

1.60

1.85

2.50

3.00

4.00

5.00

6.00

.00

8.00

9.00

0.87

1.07

1.31

1.55

1.79

2.43

2.91

3.88

4.85

5.82

6.79

.76

8.73

0.75

0.91

1.12

1.33

1.54

2.08

2.49

3.32

4.15

4.98

5.81

6.64

.47

0.69

0.85

1.04

1.23

1.42

1.93

2.31

3.08

3.85

4.62

5.39

6.16

6.93

0.61

0.75

0.92

1.09

1.26

1.70

2.04

2.72

3.40

4.08

4.76

5.44

6.12

0.55

0.67

0.82

0.98

1.13

1.53

1.83

2.44

3.05

3.66

4.27

4.88

5.49

0.47

0.57

0.70

0.83

0.96

1.30

1.56

2.08

2.60

3.12

3.64

4.16

4.68

—

0.73

0.94

1.09

1.30

1.60

1.96

2.32

2.68

3.63

4.35

5.44

5.80

.25

0.65

0.85

0.98

1.17

1.43

1.76

2.08

2.41

3.25

3.90

4.88

5.20

6.50

0.58

0.75

0.86

1.04

1.27

1.55

1.84

2.13

2.88

3.45

4.31

4.60

5.75

0.50

0.65

0.75

0.90

1.10

1.35

1.60

1.85

2.50

3.00

3.75

4.00

5.00

0.48

0.63

0.73

0.87

1.06

1.31

1.55

1.79

2.43

2.91

3.64

3.88

4.85

0.42

0.54

0.62

0.75

0.92

1.12

1.33

1.54

2.08

2.50

3.11

3.32

4.15

0.38

0.50

0.58

0.69

0.85

1.04

1.23

1.43

1.93

2.30

2.90

3.08

3.85

0.34

0.44

0.51

0.61

0.75

0.92

1.08

1.26

1.70

2.04

2.54

2.73

3.41

0.31

0.40

0.46

0.55

0.67

0.83

0.98

1.13

1.52

1.84

2.29

2.45

3.06

0.26

0.34

0.39

0.47

0.57

0.71

0.83

0.96

1.31

1.55

1.94

2.08

2.59

—

-40°C

-20°C

0°C

20°C

Maximum Ambient Temperature

25°C

40°C

50°C

60°C

70°C

85°C

125°C

(Cont’d)

RHEF; 30V - High Temperature

RHEF050

RHEF070

RHEF100

RUSBF; 16V

RUSBF090

RUSBF110

RUSBF135

RUSBF160

RUSBF185

RUSBF250

RGEF; 16V

RGEF250

RGEF300

RGEF400

RGEF500

RGEF600

RGEF700

RGEF800

3.7

4.4

5.9

8.8

10.3

11.7

3.3

4.0

5.3

6.6

8.0

9.3

10.7

3.0

3.6

4.8

6.0

8.4

9.6

2.6

3.1

4.1

5.2

6.2

8.3

2.50

3.00

4.00

5.00

6.00

7.00

8.00

2.2

2.6

3.5

4.4

5.2

6.2

6.9

2.0

2.4

3.2

4.0

4.8

5.6

6.4

1.8

2.1

2.8

3.6

4.2

5.0

5.6

1.6

1.9

2.5

3.1

3.8

4.4

5.1

1.2

1.4

1.9

2.4

2.8

3.3

3.7

—

1.31

1.60

1.96

2.32

2.68

3.63

1.17

1.43

1.76

2.08

2.41

3.25

1.04

1.27

1.55

1.84

2.13

2.88

0.90

1.10

1.35

1.60

1.85

2.50

0.87

1.07

1.31

1.55

1.79

2.43

0.75

1.00

1.12

1.33

1.54

2.08

0.69

0.92

1.04

1.23

1.42

1.93

0.61

0.75

0.92

1.09

1.26

1.70

0.55

0.67

0.82

0.98

1.13

1.53

0.47

0.57

0.70

0.83

0.96

1.30

—

0.68

0.95

1.36

0.62

0.87

1.24

0.56

0.79

1.13

0.51

0.72

1.03

0.50

0.70

1.00

0.44

0.62

0.89

0.40

0.56

0.80

0.36

0.51

0.73

0.34

0.47

0.67

0.28

0.39

0.56

0.12

0.17

0.24

157

Halogen Free

RoHS Compliant, ELV Compliant

PolySwitch Resettable Devices

Radial-Leaded Devices

Table R2 — Thermal Derating [Hold Current (A) at Ambient Temperature (°C)]

Part

Number

RGEF; 16V

RGEF900

RGEF1000

RGEF1100

RGEF1200

RGEF1400

13.2

14.7

16.1

20.5

11.9

13.3

14.6

16.0

18.7

10.7

12.0

13.1

14.4

16.8

9.4

10.3

11.5

12.4

14.5

9.00

10.00

11.00

12.00

14.00

8.7

9.7

10.4

12.1

8.0

8.8

9.6

11.2

6.4

7.8

8.4

9.8

5.6

6.3

6.9

8.9

4.2

4.7

5.2

5.6

6.5

—

-40°C

-20°C

0°C

20°C

Maximum Ambient Temperature

25°C

40°C

50°C

60°C

70°C

85°C

125°C

(Cont’d)

RHEF; 16V - High Temperature

RHEF200

RHEF300

RHEF400

RHEF450

RHEF550

RHEF600

RHEF650

RHEF700

RHEF750

RHEF800

RHEF900

RHEF1000

RHEF1100

RHEF1300

RHEF1400

RHEF1500

RUSBF; 6V

RUSBF075

RUSBF120

RUSBF155

1.05

1.69

2.17

0.95

1.52

1.96

0.85

1.36

1.75

0.75

1.20

1.55

0.73

1.16

1.50

0.65

1.04

1.34

0.60

0.96

1.24

0.55

0.88

1.14

0.50

0.80

1.03

0.43

0.68

0.88

—

2.71

4.07

5.57

6.10

.47

8.20

8.80

9.51

10.20

10.87

12.21

13.60

14.94

.70

19.01

20.40

2.49

3.74

5.11

5.60

6.86

.50

8.10

8.73

9.40

9.98

11.19

12.50

13.72

16.30

.46

18.80

2.26

3.41

4.65

5.10

6.24

6.80

.40

.95

8.60

9.08

10.16

11.40

12.49

14.80

15.89

.10

2.06

3.09

4.22

4.60

5.66

6.20

6.70

.20

.70

8.23

9.26

10.30

11.31

13.40

14.40

15.50

2.00

3.00

4.00

4.50

5.50

6.00

6.50

7.00

.50

8.00

9.00

10.00

11.00

13.00

14.00

15.00

1.77

2.65

3.62

4.00

4.85

5.30

5.70

6.17

6.60

.06

.97

8.80

9.70

11.40

12.35

13.20

1.60

2.40

3.29

3.60

4.41

4.90

5.30

5.61

6.10

6.41

.20

8.10

8.82

10.50

11.22

12.10

1.46

2.21

3.01

3.30

4.04

4.40

4.80

5.15

5.60

5.88

6.56

.40

8.09

9.60

10.29

11.10

1.34

2.00

2.73

3.00

3.66

4.00

4.30

4.66

5.00

5.33

6.04

6.60

.32

8.60

9.32

9.90

1.11

1.66

2.27

2.50

3.05

3.30

3.60

3.88

4.10

4.43

5.01

5.50

6.09

.20

.76

8.30

0.49

0.74

1.01

1.10

1.36

1.50

1.60

1.73

1.90

1.97

2.19

2.50

2.71

3.30

3.45

3.80

Figures R1-R5 — Thermal Derating Curve

RXEF

Figure R1

200

% of Rated Hold and Trip Current

150

100

-40

-20

Ambient Temperature (˚C)

RoHS Compliant, ELV Compliant

Halogen Free