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
HF
Halogen Free
Specifications subject to change without notice. ©2018 Littelfuse, Inc.
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)
RGEF (<16V), RUEF (<30V)
RXEF (<72V)
RXEF (<72V)
RGEF (<16V), RUEF (<30V)
RGEF (<16V), RUEF (<30V)
RXEF (<72V), RGEF (<16V)
RXEF (<72V), RUEF (<30V)
RXEF (<72V), RUEF (<30V)
RGEF (<16V), RUEF (<30V)
RGEF (<16V), RUEF (<30V)
RGEF (<16V), RUEF (<30V)
RGEF (<16V), RUEF (<30V)
RUEF (<30V)
RUEF (<30V)
RUEF (<30V)
RUSBF (<16V)
RGEF (<16V), RUEF (<30V)
RHEF (<16V)
RXEF (<72V), RKEF (<60V)
RHEF (<16V)
RHEF (<16V)
RHEF (<16V)
RHEF (<16V)
RXEF (<72V), RKEF (<60V)
RXEF (<72V), RKEF (<60V)
RXEF (<72V), RKEF (<60V)
RXEF (<72V), RKEF (<60V)
RHEF (<16V)
RHEF (<16V)
RHEF (<16V)
RXEF (<72V), RKEF (<60V)
RXEF (<72V), RKEF (<60V)
RXEF (<72V), RKEF (<60V)
Flatter Derating
RHEF (<16V)
RHEF (<16V)
Lower Current Higher Voltage
RXEF (<72V), RKEF (<60V)
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
6V
155
Specifications subject to change without notice. ©2018 Littelfuse, Inc.
HF
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
7
.000
7
.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
0.0050Ω
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
0.030Ω
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
72V
RKEF
60V
RXEF
60V
RUEF
30V
RGEF
16V
RHEF
16V
RHEF
30V
RUSBF
16V
(Cont’d)
RUSBF
6V
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
HF
Halogen Free
Specifications subject to change without notice. ©2018 Littelfuse, Inc.
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
7
.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
7
.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
7
.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
7
.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
7
.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
7
.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
7
.3
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
7
.2
8.4
9.6
2.6
3.1
4.1
5.2
6.2
7
.3
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
Specifications subject to change without notice. ©2018 Littelfuse, Inc.
HF
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
17
.6
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
7
.9
8.7
9.7
10.4
12.1
7
.2
8.0
8.8
9.6
11.2
6.4
7
.0
7.8
8.4
9.8
5.6
6.3
6.9
7
.6
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
7
.47
8.20
8.80
9.51
10.20
10.87
12.21
13.60
14.94
17
.70
19.01
20.40
2.49
3.74
5.11
5.60
6.86
7
.50
8.10
8.73
9.40
9.98
11.19
12.50
13.72
16.30
17
.46
18.80
2.26
3.41
4.65
5.10
6.24
6.80
7
.40
7
.95
8.60
9.08
10.16
11.40
12.49
14.80
15.89
17
.10
2.06
3.09
4.22
4.60
5.66
6.20
6.70
7
.20
7
.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
7
.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
7
.06
7
.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
7
.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
7
.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
7
.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
7
.20
7
.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
50
0
-40
-20
0
20
40
60
80
Ambient Temperature (˚C)
RoHS Compliant, ELV Compliant
HF
Halogen Free
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