PolySwitch® Resettable PPTCs
© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 10/22/18
Radial Leaded > RUEF Series
RUEF Series RoHS
Description
Littelfuse PolySwitch radial-leaded devices represent the
most comprehensive and complete set of PPTC products
available in the industry today. RUEF series is for balance
of voltage rating (30V) and hold current (up to 9A).
Features
• Resettable and single-use overcurrent devices
• Wide range of form factor and termination methods
• Devices compatible with high-volume electronics
assembly
• RoHS compliant, Lead-Free and Halogen-Free
Applications
• Satellite video receivers
• Industrial controls
• Transformers
• Computer motherboards
• Modems
• USB hubs, ports and
peripherals
• IEEE 1394 ports
• CD-ROMs
• Game machines
• Battery packs
• Phones
• Fax machines
• Analog and digital line cards
• Printers
Agency Approvals
AGENCY AGENCY FILE NUMBER
E74889
78165
72161784
Electrical Characteristics
Part
Number
IHITVMAX IMAX PD Typ Max Time-to-trip RMIN RMAX R1MAX Lead Size
(mm2/AWG)
(A) (A) (VDC) (VAC RMS) (DCADC)(ACARMS) (W) (A) (s) (Ω) (Ω) (Ω)
RUEF – 30V
RUEF090 0.90 1.80 30 30 100 70 0.60 4.50 5.9 0.070 0.120 0.22 0.205/24
RUEF110 1. 10 2.20 30 30 100 70 0.70 5.50 6.6 0.070 0.100 0.17 0.205/24
RUEF135 1.35 2.70 30 30 100 70 0.80 6.75 7. 3 0.040 0.080 0.13 0.205/24
RUEF160 1.60 3.20 30 30 100 70 0.90 8.00 8.0 0.030 0.070 0.11 0.205/24
RUEF185 1.85 3.70 30 30 100 70 1. 0 0 9.25 8.7 0.030 0.060 0.09 0.205/24
RUEF250 2.50 5.00 30 30 100 70 1.20 12.50 10.3 0.020 0.040 0.07 0.205/24
RUEF300 3.00 6.00 30 30 100 70 2.00 15.00 10.8 0.020 0.050 0.08 0.205/24
RUEF400 4.00 8.00 30 30 100 70 2.50 20.00 12.7 0.010 0.030 0.05 0.205/24
RUEF500 5.00 10.00 30 30 100 70 3.00 25.00 14.5 0.010 0.030 0.05 0.520/20
RUEF600 6.00 12.00 30 30 100 70 3.50 30.00 16.0 0.005 0.020 0.04 0.520/20
RUEF700 7. 0 0 14.00 30 30 100 70 3.80 35.00 1 7. 5 0.005 0.020 0.03 0.520/20
RUEF800 8.00 16.00 30 30 100 70 4.00 40.00 18.8 0.005 0.013 0.02 0.520/20
RUEF900 9.00 18.00 30 30 100 70 4.20 45.00 20.0 0.005 0.010 0.02 0.520/20
Notes:
IH : Hold current: maximum current device will pass without interruption in 20°C still air.
IT : Trip current: minimum current that will switch the device from low resistance to
high resistance in 20°C still air.
VMAX : Maximum continuous voltage device can withstand without damage at rated current.
IMAX : Maximum fault current device can withstand without damage at rated voltage.
PD : Power dissipated from device when in the tripped state in 20°C still air.
RMIN : Minimum resistance of device as supplied at 20°C unless otherwise specified.
RMAX : Maximum resistance of device as supplied at 20°C unless otherwise specified.
R1MAX :
Maximum resistance of device when measured one hour post reflow
(surface-mount device) or one hour post trip (radial-leaded device) at 20°C unless
otherwise specified.
* Electrical characteristics determined at 25°C.
Additional Information
Datasheet Resources Samples
PolySwitch® Resettable PTCs
© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 10/22/18
Radial Leaded > RUEF Series
Temperature Rerating
Maximum Ambient Temperature
-40°C -20°C 0°C 20°C 25°C 40°C 50°C 60°C 70°C 85°C
Hold Current (A)
RUEF – 30V
RUEF090 1.31 1. 17 1.04 0.90 0.87 0.75 0.69 0.61 0.55 0.47
RUEF110 1.60 1.43 1.27 1. 10 1.07 0.91 0.85 0.75 0.67 0.57
RUEF135 1.96 1. 76 1.55 1.35 1.31 1. 12 1.04 0.92 0.82 0.70
RUEF160 2.32 2.08 1.84 1.60 1.55 1.33 1.23 1.09 0.98 0.83
RUEF185 2.68 2.41 2.13 1.85 1.79 1.54 1.42 1.26 1. 13 0.96
RUEF250 3.63 3.25 2.88 2.50 2.43 2.08 1.93 1.70 1.53 1.30
RUEF300 4.35 3.90 3.45 3.00 2.91 2.49 2.31 2.04 1.83 1.56
RUEF400 5.80 5.20 4.60 4.00 3.88 3.32 3.08 2.72 2.44 2.08
RUEF500 7.25 6.50 5.75 5.00 4.85 4.15 3.85 3.40 3.05 2.60
RUEF600 8.70 7.80 6.90 6.00 5.82 4.98 4.62 4.08 3.66 3.12
RUEF700 10.15 9.10 8.05 7. 0 0 6.79 5.81 5.39 4.76 4.27 3.64
RUEF800 11.60 10.40 9.20 8.00 7. 7 6 6.64 6.16 5.44 4.88 4.16
RUEF900 13.05 11.70 10.35 9.00 8.73 7.47 6.93 6.12 5.49 4.68
% of Rated Hold and T
rip Current
Ambient Temperature (˚C)
200
150
100
50
0
-40 -20 020406080
Temperature Rerating Curve
PolySwitch® Resettable PPTCs
© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 10/22/18
Radial Leaded > RUEF Series
Lead Material
RUEF090 to RUEF250: Tin-plated Copper-clad Steel, 0.205mm2 (24AWG)
RUEF300 to RUEF900: Tin-plated Copper, 0.52mm2 (20AWG), ø0.81mm (0.032in)
Soldering Characteristics Solderability per ANSI/J-STD-002 Category 3
Solder Heat Withstand per IEC-STD 68-2-20, Test Tb, Method 1a, Condition b, Can Withstand 10s at 260°C ±5°C
Insulating Material Cured, Flame-retardant Epoxy Polymer; Meets UL 94V-0
Operation Temperature -40°C~85°C
Note: Devices are not designed to be placed through a reflow process.
Environmental Specifications
Test Conditions Resistance Change
Passive Aging
70°C, 1000 hrs
85°C, 1000 hrs
±5%
±5%
Humidity Aging 85°C, 85% R.H., 1000 hrs ±5%
Thermal Shock 85°C to -40°C (10 times) ±5%
Solvent Resistance MIL-STD-202, Method 215F No change
Moisture Resistance Level Level 1, J-STD-020
Storage Conditions 40°C max, 70% RH max; devices should remain in original sealed bags prior to use.
Devices may not meet specified values if these storage conditions are exceeded.
Physical Specifications
Typical Time-to-Trip Curves at 20°C
RUEF
A = RUEF090
B = RUEF110
C = RUEF135
D = RUEF160
E = RUEF185
F = RUEF250
G = RUEF300
H = RUEF400
I = RUEF500
J = RUEF600
K = RUEF700
L = RUEF800
M = RUEF900
Time-to-Trip (s)
Fault Current (A)
100
10
1
0.1
0.01 110100
A
ABC
D
E
F
G
H
I
J
K
L
M
BCDE FGHIJKLM
PolySwitch® Resettable PTCs
© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 10/22/18
Radial Leaded > RUEF Series
Dimensions and Weights
Part
Number
Dimensions in Millimeters (Inches)
Figure Device Mass (g)
(Only for Reference)
A B C D E H J
Min Max Min Max Min Max Min Max Min Max Typ Typ
RUEF – 30V
RUEF090 — 7.4 — 12.2 4.3 5.8 7.6 — — 3.0 0.89 0.8 1,3,4 0.183
(0.29) (0.48) (0.17) (0.23) (0.30) (0.12) (0.035) (0.03)
RUEF110 — 7.4 — 14.2 4.3 5.8 7.6 — — 3.0 0.89 0.8 1,3,4 0.204
(0.29) (0.56) (0.17) (0.23) (0.30) (0.12) (0.035) (0.03)
RUEF135 — 8.9 — 13.5 4.3 5.8 7.6 — — 3.0 0.89 1.0 1,3,4 0.255
(0.35) (0.53) (0.17) (0.23) (0.30) (0.12) (0.035) (0.04)
RUEF160 — 8.9 — 15.2 4.3 5.8 7.6 — — 3.0 0.89 1.0 1,3,4 0.289
(0.35) (0.60) (0.17) (0.23) (0.30) (0.12) (0.035) (0.04)
RUEF185 — 10.2 — 15.7 4.3 5.8 7.6 — — 3.0 0.89 1.0 1,3,4 0.379
(0.40) (0.62) (0.17) (0.23) (0.30) (0.12) (0.035) (0.04)
RUEF250 — 11.4 — 18.3 4.3 5.8 7.6 — — 3.0 0.89 1.2 1,3,4 0.493
(0.45) (0.72) (0.17) (0.23) (0.30) (0.12) (0.035) (0.05)
RUEF300 — 11.4 — 16.5 4.3 5.8 7.6 — — 3.0 1.19 1.5 2,3,4 0.516
(0.45) (0.65) (0.17) (0.23) (0.30) (0.12) (0.047) (0.06)
RUEF400 — 14.0 — 19.3 4.3 5.8 7.6 — — 3.0 1.19 1.7 2,3,4 0.670
(0.55) (0.76) (0.17) (0.23) (0.30) (0.12) (0.047) (0.07)
RUEF500 — 14.0 — 24.1 9.4 10.9 7.6 — — 3.0 1.19 1.0 2,3,4 0.926
(0.55) (0.95) (0.37) (0.43) (0.30) (0.12) (0.047) (0.04)
RUEF600 — 16.5 — 24.1 9.4 10.9 7.6 — — 3.0 1.19 1.0 2,3,4 1.352
(0.65) (0.95) (0.37) (0.43) (0.30) (0.12) (0.047) (0.04)
RUEF700 — 19.1 — 25.9 9.4 10.9 7.6 — — 3.0 1.19 1.2 2,3,4 1.543
(0.75) (1.02) (0.37) (0.43) (0.30) (0.12) (0.047) (0.05)
RUEF800 — 21.6 — 28.4 9.4 10.9 7.6 — — 3.0 1.19 1.5 2,3,4 1.852
(0.85) (1.12) (0.37) (0.43) (0.30) (0.12) (0.047) (0.06)
RUEF900 —24.1 —29.0 9.4 10.9 7.6 — —3.0 1.19 1.5 2,3,4 2.104
(0.95) (1.14) (0.37) (0.43) (0.30) (0.12) (0.047) (0.06)
Figure 2Figure 1
J
J
A
E
C
H
A
B
D
B
D
B
D
C
Cto
LC
LC
LC
L
A
B
D
C
Cto
LC
LC
LC
L
A
B
D
C
Cto
LC
LC
LC
L
A
B
D
CF
Cto
LC
LC
LC
L
A
B
D
C
Cto
LC
LC
LC
L
A
C
Cto
LC
L
C
Cto
LC
L
E E AE
E
E
E
B
D
CF
Cto
LC
LC
LC
L
AE
FF
B
D
C
Cto
LC
LC
LC
L
A
B
D
C
Cto
LC
L
A
E
E
E
F
F
F
E
A
B
D
C
Cto
LC
L
J
J
A
E
C
H
A
B
D
B
D
B
D
C
Cto
LC
LC
LC
L
A
B
D
C
Cto
LC
LC
LC
L
A
B
D
C
Cto
LC
LC
LC
L
A
B
D
CF
Cto
LC
LC
LC
L
A
B
D
C
Cto
LC
LC
LC
L
A
C
Cto
LC
L
C
Cto
LC
L
E E AE
E
E
E
B
D
CF
Cto
LC
LC
LC
L
AE
FF
B
D
C
Cto
LC
LC
LC
L
A
B
D
C
Cto
LC
L
A
E
E
E
F
F
F
E
A
B
D
C
Cto
LC
L
Dimension Figures
J
J
A
E
C
H
A
B
D
B
D
B
D
C
Cto
LC
LC
LC
L
A
B
D
C
Cto
LC
LC
LC
L
A
B
D
C
Cto
LC
LC
LC
L
A
B
D
CF
Cto
LC
LC
LC
L
A
B
D
C
Cto
LC
LC
LC
L
A
C
Cto
LC
L
C
Cto
LC
L
E E AE
E
E
E
B
D
CF
Cto
LC
LC
LC
L
AE
F
F
B
D
C
Cto
LC
LC
LC
L
A
B
D
C
Cto
LC
L
A
E
E
E
F
F
F
E
A
B
D
C
Cto
LC
L
J
J
A
E
C
H
A
B
D
B
D
B
D
C
Cto
LC
LC
LC
L
A
B
D
C
Cto
LC
LC
LC
L
A
B
D
C
Cto
LC
LC
LC
L
A
B
D
CF
Cto
LC
LC
LC
L
A
B
D
C
Cto
LC
LC
LC
L
A
C
Cto
LC
L
C
Cto
LC
L
E E AE
E
E
E
B
D
CF
Cto
LC
LC
LC
L
AE
FF
B
D
C
Cto
LC
LC
LC
L
A
B
D
C
Cto
LC
L
A
E
E
E
F
F
F
E
A
B
D
C
Cto
LC
L
Figure 4Figure 3
PolySwitch® Resettable PPTCs
© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 10/22/18
Radial Leaded > RUEF Series
Packaging and Marking Information
Part
Number
Bag
Quantity
Tape and Reel
Quantity
Ammo Pack
Quantity
Standard Package
Quantity
Part
Marking
Agency
Recognition
RUEF – 30V
RUEF090 500 — — 10,000 U90 UL, CSA, TÜV, CQC
RUEF090-2 — 3,000 — 15,000 U90 UL, CSA, TÜV, CQC
RUEF090-AP — — 2,000 10,000 U90 UL, CSA, TÜV, CQC
RUEF110 500 — — 10,000 U110 UL, CSA, TÜV, CQC
RUEF110-2 — 3,000 — 15,000 U110 UL, CSA, TÜV, CQC
RUEF110-AP — — 2,000 10,000 U110 UL, CSA, TÜV, CQC
RUEF135 500 — — 10,000 U135 UL, CSA, TÜV, CQC
RUEF135-2 — 3,000 — 15,000 U135 UL, CSA, TÜV, CQC
RUEF135-AP — — 2,000 10,000 U135 UL, CSA, TÜV, CQC
RUEF160 500 — — 10,000 U160 UL, CSA, TÜV, CQC
RUEF160-2 — 3,000 — 15,000 U160 UL, CSA, TÜV, CQC
RUEF160-AP — — 2,000 10,000 U160 UL, CSA, TÜV, CQC
RUEF185 500 — — 10,000 U185 UL, CSA, TÜV, CQC
RUEF185-2 — 3,000 — 15,000 U185 UL, CSA, TÜV, CQC
RUEF185-AP — — 2,000 10,000 U185 UL, CSA, TÜV, CQC
RUEF250 500 — — 10,000 U250 UL, CSA, TÜV, CQC
RUEF250-2 — 3,000 — 15,000 U250 UL, CSA, TÜV, CQC
RUEF250-AP — — 2,000 10,000 U250 UL, CSA, TÜV, CQC
RUEF300 500 — — 10,000 U300 UL, CSA, TÜV, CQC
RUEF300-2 — 2,500 — 12,500 U300 UL, CSA, TÜV, CQC
RUEF300-AP — — 1,000 5,000 U300 UL, CSA, TÜV, CQC
RUEF400 500 — — 10,000 U400 UL, CSA, TÜV, CQC
RUEF400-2 — 1,500 — 7,500 U400 UL, CSA, TÜV, CQC
RUEF400-AP — — 1,000 5,000 U400 UL, CSA, TÜV, CQC
RUEF500 250 — — 5,000 U500 UL, CSA, TÜV, CQC
RUEF500-2 — 1,500 — 7,500 U500 UL, CSA, TÜV, CQC
RUEF500-AP — — 1,000 5,000 U500 UL, CSA, TÜV, CQC
RUEF600 250 — — 5,000 U600 UL, CSA, TÜV, CQC
RUEF600-2 — 1,000 — 5,000 U600 UL, CSA, TÜV, CQC
RUEF600-AP — — 1,000 5,000 U600 UL, CSA, TÜV, CQC
RUEF700 250 — — 5,000 U700 UL, CSA, TÜV, CQC
RUEF700-2 — 1,000 — 5,000 U700 UL, CSA, TÜV, CQC
RUEF700-AP — — 1,000 5,000 U700 UL, CSA, TÜV, CQC
RUEF800 250 — — 5,000 U800 UL, CSA, TÜV, CQC
RUEF800-2 — 1,000 — 5,000 U800 UL, CSA, TÜV, CQC
RUEF800-AP — — 1,000 5,000 U800 UL, CSA, TÜV, CQC
RUEF900 250 — — 5,000 U900 UL, CSA, TÜV, CQC
RUEF900-2 — 1,000 — 4,000 U900 UL, CSA, TÜV, CQC
RUEF900-AP — — 1,000 4,000 U900 UL, CSA, TÜV, CQC
PolySwitch® Resettable PTCs
© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 10/22/18
Radial Leaded > RUEF Series
Part Ordering Number System
RUEF 250 U 2
Packaging
Blank = Packaged in Bags
-1 = 25.4mm (1.0 in) Minimum Lead Length
-2 = Tape and Reel
-AP = Ammo Pack
-X.X = Special Lead Cut Length (in)
Modifier
K = Standard Kinked Lead
B = Special Kinked Lead
S = Straight Lead
U = Uncoated Device
Hold Current Indicator
Product Series
An “F” at the end of product series indicates Pb-free version of product.
Note: Kinked parts are recommended to control the height of the part on the PCB in non-auto PCB applications.
PolySwitch® Resettable PPTCs
© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 10/22/18
Radial Leaded > RUEF Series
Tape and Reel Specifications
RUEF devices are available in tape and reel packaging per EIA468–B/IEC60286–2 standards.
See Figures 1 and 2 for details.
Description EIA Mark Dimension (mm) Tolerance
Carrier Tape Width W18 -0.5/+1.0
Hold-down Tape Width W411 Minimum
Top Distance between Tape Edges W63 Maximum
Sprocket Hole Position W59 -0.5/+0.75
Sprocket Hole Diameter W04 ± 0.2
Abscissa to Plane (Straight Lead)* (RUEF300 to RUEF900) H 18.5 ± 2.5
Abscissa to Plane (Kinked Lead) (RUEF090 to RUEF250) H016.0 ± 0.5
Abscissa to Top (RUEF090 to RUEF300) H132.2 Maximum
Abscissa to Top* (RUEF400 to RUEF900) H145.0 Maximum
Overall Width with Lead Protrusion (RUEF090 to RUEF300) C143.2 Maximum
Overall Width with Lead Protrusion (RUEF400 To RUEF900) C156 Maximum
Overall Width without Lead Protrusion (RUEF090 to RUEF300) C242.5 Maximum
Overall Width without Lead Protrusion (RUEF400 to RUEF900) C256 Maximum
Lead Protrusion L11. 0 Maximum
Protrusion of Cut-out L 11 Maximum
Protrusion beyond Hold-down Tape I2Not Specified —
Sprocket Hole Pitch P012.7 ± 0.3
Device Pitch (RUEF090 to RUEF300) — 12.7 ± 0.3
Device Pitch (RUEF400 to RUEF900) — 25.4 ± 0.6
Pitch Tolerance — 20 Consecutive ± 1
Tape Thickness T 0.9 Maximum
Overall Tape and Lead Thickness (RUEF090 to RUEF50) T11. 5 Maximum
Overall Tape and Lead Thickness* (RUEF300 to RUEF900) T12.3 Maximum
Splice Sprocket Hole Alignment — 0 ± 0.3
Body Lateral Deviation Dh 0 ± 1.0
Body Tape Plane Deviation Dp 0 ± 1.3
Ordinate to Adjacent Component Lead (RUEF090 to RUEF300) P13.81 ± 0.7
Ordinate to Adjacent Component Lead (RUEF400 to RUEF900) P17.62 ± 0.7
Lead Spacing* (RUEF090 to RUEF400) F 5.05 ± 0.75
Lead Spacing* (RUEF500 to RUEF900) F 10.15 ± 0.75
Reel Width (RUEF090 to RUEF400) W256.0 Maximum
Reel Width (RUEF500* to RUEF900) W263.5 Maximum
Reel Diameter A 370.0 Maximum
Space between Flanges* (RUEF090 to RUEF400) W148.0 Maximum
Space between Flanges* (RUEF500 to RUEF900) W155.0 Maximum
Arbor Hold Diameter C 26.0 ± 12.0
Core Diameter* N 91.0 Maximum
Box — 64/372/362 Maximum
Consecutive Missing Places — None —
Empty Places per Reel — 0.1% Maximum
*Differs from EIA specification.
PolySwitch® Resettable PTCs
© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 10/22/18
Radial Leaded > RUEF Series
w1
n
a
c
w2
Cross Section
Direction of
Unreeling
Reel
Type
Upper Side
Lower Side
Optional Shape: Circular or Polygonal
h
H1P1
D4
H0
H1
C1
C2
F
AB
Reference Plane
Direction of Unreeling
Cross Section A-B
W5
H
W
t
P0D0
I2
L
L1
hpp
Tape and Reel Diagrams
Figure 1
Figure 2
Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each
product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications.
Read complete Disclaimer Notice at www.littelfuse.com/disclaimer-electronics.
WARNING
• Users should independently evaluate the suitability of and test each product selected for their own application.
• Operation beyond the maximum ratings or improper use may result in device damage and possible electrical arcing and flame.
• These devices are intended for protection against damage caused by occasional overcurrent or overtemperature fault conditions and should not be used when
repeated fault conditions or prolonged trip events are anticipated.
• Contamination of the PPTC material with certain silicone-based oils or some aggressive solvents can adversely impact the performance of the devices.
• Device performance can be impacted negatively if devices are handled in a manner inconsistent with recommended electronic, thermal, and mechanical
procedures for electronic components.
• PPTC devices are not recommended for installation in applications where the device is constrained such that its PTC properties are inhibited, for example in rigid
potting materials or in rigid housings, which lack adequate clearance to accommodate device expansion.
• Operation in circuits with a large inductance can generate a circuit voltage (Ldi/dt) above the rated voltage of the device.
