PolySwitch® Resettable PPTC Datasheet
250R Series
Radial Leaded
RoHS
Description
he 250R Series is designed to protect against short duration high
T
voltage fault currents (power cross or power induction surge)
typically found in telecom applications (250Vrms). The series can
be used to help telecom networking equipment meet the
protection requirements specified in ITU K.20 and K.21.
Features
■ 0.08 – 0.18 hold current
range, 60VDC operating
voltage
■ 250VAC interrupt rating
■ Binned and sorted narrow
resistance ranges available
■ RoHS-compliant, Lead-Free
and Halogen-Free*
■ Fast time–to-trip
Applications
Additional Information
■ Customer Premises
Equipment (CPE)
■ LAN/WAN equipment
■ Central Office (CO)/ telecom
centers
Resources
Accessories
■ Access equipment
Samples
Agency Approvals
Agency
Agency File Number
E183209
R50120008
Electrical Characteristics
Part Number
I hold
(A)
I trip
(A)
Vmax
Vint / Vop
I max
(A)
250R080
250R120
250R120-RA
250R120-RC
250R120-R2
250R145
250R180
0.08
0.12
0.12
0.12
0.12
0.145
0.18
0.16
0.24
0.24
0.24
0.24
0.29
0.65
250/60
250/60
250/60
250/60
250/60
250/60
250/60
3
3
3
3
3
3
10
Maximum Time To Trip
Resistance
Pd
typ. (W) Current (A) Time (Sec.) R (Ω) R (Ω) R
(Ω)
min
typ
1max
1
1
1
1
1
1
1.8
0.35
1
1
1
1
1
1
4.0
2.5
2.5
3.0
2.5
2.5
20
14
4
7
5.4
8
3
0.8
22
8
9
7.5
10.5
6
2.2
33
16
16
14
16
14
4
Agency Approvals
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Note: Items with T at end of part number = pre-tripped device. See Part Ordering Number System section of this data sheet for additional information.
I hold = Hold current: maximum current device will pass without tripping in 20°C still air.
R min = Minimum resistance of device in initial (un-soldered) state.
I trip = Trip current: minimum current at which the device will trip in 20°C still air.
R typ = Typical resistance of device in initial (un-soldered) state.
Vint = Maximum voltage the device can withstand without damage at rated current (I max)
R 1max = Maximum resistance of device at 20°C measured one hour after tripping.
Vop = The device regular operation voltage
* Effective February 11, 2010 onward, all 600R PTC products will be manufactured Halogen Free (HF). Existing
I max = Maximum fault current device can withstand without damage at rated voltage (Vmax)
Non-Halogen Free 600R PTC products may continue to be sold, until supplies are depleted. This change will
P d = Power dissipated from device when in the tripped state at 20°C still air.
have no effect on 600R product specifications or performance.
Warning
• Users shall independently assess the suitability of these devices for each of their applications
• Operation of these devices beyond the stated maximum ratings could result in damage to the devices and lead to electrical arcing and/or fire
• These devices are intended to protect against the effects of temporary over-current or over-temperature conditions and are not intended to perform as protective devices where such conditions are expected to be
repetitive or prolonged in duration
• Exposure to silicon-based oils, solvents, electrolytes, acids, and similar materials can adversely affect the performance of these PPTC devices
• These devices undergo thermal expansion under fault conditions, and thus shall be provided with adequate space and be protected against mechanical stresses
• Circuits with inductance may generate a voltage (L di/dt) above the rated voltage of the PPTC device.
1
© 2021 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 10/29/21
PolySwitch® Resettable PPTC Datasheet
250R Series
Radial Leaded
Temperature Rerating
Ambient Operation Temperature
-40°C
-20°C
0°C
20°C
40°C
Part Number
250R080
250R120
250R145
250R180
0.12
0.18
0.26
0.28
0.11
0.16
0.20
0.23
0.09
0.14
0.17
0.21
0.08
0.12
0.145
0.18
0.06
0.10
0.12
0.16
70°C
85°C
0.05
0.09
0.11
0.13
0.05
0.08
0.09
0.10
0.04
0.06
0.08
0.11
0.03
0.05
0.06
0.083
170%
1000
150%
Percentage of Rated Current
100
Time to trip (sec)
60°C
Temperature Rerating Curve
Average Time Current Curves
10
1
B
C
D
0,1
A
0,01
0,001
50°C
Hold Current (A)
130%
110%
90%
70%
50%
30%
10%
0,1
1
10
-40 -30 -20
Fault Current (A)
Ihold (A)
A
B
C
D
0.18
0.145
0.12
0.80
0
10
20 30 40
Temperature (°C)
50
60
70
80
Note: Typical Temperature rerating curve, refer to table for derating data
The average time current curves and Temperature Rerating curve performance is affected by a number
or variables, and these curves provided as guidance only. Customer must verify the performance in their
application.
Curve Designation
-10
2
© 2021 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 10/29/21
PolySwitch® Resettable PPTC Datasheet
250R Series
Radial Leaded
Agency Specification Selection Guide For Telecom and Networking Applications
Product
Lightning
Power Cross
250R120
250R145
ITU K.20/21/45 – 1.5kV 10/700μs
ITU K.20/21/45 – 4kV 10/700μs*
ITU K.20/21/45 – 1.5kV 10/700μs
ITU K.20/21/45 – 4kV 10/700μs*
Telcordia GR – 974 – 1.0kV 10/1000μs
ITU K.20/21/45 – 230Vac, 10Ω
ITU K.20/21/45 – 600Vac, 600Ω
ITU K.20/21/45 – 230Vac, 10Ω
ITU K.20/21/45 – 600Vac, 600Ω
Telcordia GR – 974- 283Vac, 10A
250R180
*Devices should be independently evaluated and tested for use in any specific application
Protection Application Guide
Region/Specification
Application
South America/Asia/Europe ITU K.45
*Access network equipment, Remote terminal
Repeaters, WAN equipment, Cross –connect
South America/Asia/Europe ITU K.21
Customer and IT equipment, Analog modems
ADSL, xDSL, Phone sets, PBX systems, Internet appliances, POS terminals
South America/Asia/Europe ITU K.20
Central Office, POTS/ISDN linecards, T1/E1/J1 linecards,
ADSL/VDSL splitters, CSU/DSU,
North America Telcordia GR-974
250R180
250R145
250R120
250R180
250R145
250R120
250R180
250R145
250R120
250R180
250R145
250R120
250R180
250R145
250R120
250R080
*Primary protection modules,
MDF modules, Network interface
South America/Asia/Europe ITU K.20
North America Telcordia GR-1089
South America/Asia/Europe
ITU K.20 and K.21
-
Device Selection
*Intrabuilding communication systems, LAN, VOIP cards, Local loop handsets,
LAN Intrabuilding power cross, Protection, LAN equipment, IP phone
*Resistance binned parts are recommended
Soldering Parameters - Wave Soldering
Condition
Peak Temp/ Duration Time
> 220°C
Preheat 140°C~ 180°C
Storage Condition
Wave Soldering
260°C < 5 Sec
2 Sec ~ 20 Sec
180 Sec ~ 210 Sec
0°C~35°C, < 70%RH
Soldering
260
Cooling
220
Temperature (°C)
Note:
• R ecommended soldering methods: heat element oven or N2 environment for lead–free
•D
evices are designed to be wave soldered to the bottom side of the board.
•D
evices can be cleaned using standard industry methods and solvents.
• T his profile can be used for lead-free device
• If soldering temperatures exceed the recommended profile, devices may not meet the
performance requirements.
190
160
0
Preheating
180 to 210
2 to 5
20-30
Time(s)
3
© 2021 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 10/29/21
PolySwitch® Resettable PPTC Datasheet
Figure 1
250R Series
C
A
Figure 2
A
Radial Leaded
B
Physical Specifications
Soldering
Characteristics
Insulating Material
Device Labeling
Figure 1
A
Environmental Specifications
D
Operating Temperature
Tin-plated Copper
Solderability per MIL–STD–202,
Method 208
Cured, flame retardant epoxy polymer
meets UL94V-0 requirements.
Marked with 'LF', voltage, current rating,
and date code.
Lead Material
D
125°C
F
E
Passive Aging
65°C/85°C, 1000 hours
Humidity Aging
+85°C, 85% R.H,.1000 hours
Thermal Shock
MIL–STD–202, Method 107
+125°C to -55°C 10 times
Solvent Resistance
MIL–STD–202, Method 215
Moisture Sesitivity Level
Level 1, J–STD–020
Part Marking System
A
C
250
Littelfuse
Trademark
B
Littelfuse
Voltage Rating
Trademark
Current Rating
Date Code
(Contact Littelfuse
for additional
information)
080
XXXX
B
250
Voltage Rating
Current Rating
Date Code
(Contact Littelfuse
for additional
information)
120
XXXX
D
D
F
E
F
E
Figure 1
Figure 2
A
Part Number
250R080
250R120
250R120-RA
250R120-RC
250
080
XXXX
250R120-R2
250R145
250R180
Littelfuse
Trademark
-40°C to +85°C
Maximum Device Surface
TemperatureEin Tripped State
Figure 2
Dimensions
C
B
Figure
1
2
2
2
2
2
1
Littelfuse
Voltage Rating
Trademark
Current Rating
Date Code
(Contact Littelfuse
for additional
information)
B
C
D
E
Physical Characteristics
Inches
mm
Inches
mm
Inches
mm
Inches
mm
Inches
mm
Max.
Max.
Max.
Max.
Max.
Max.
Min.
Min.
Typ.
Typ.
Inches
mm
5.8
6.8
6.8
6.8
6.8
6.8
9.5
0.39
0.43
0.43
0.43
0.43
0.43
0.47
9.9
11
11
11
11
11
12
0.18
0.18
0.18
0.18
0.18
0.18
0.18
4.6
4.6
4.6
4.6
4.6
4.6
4.6
0.19
0.19
0.19
0.19
0.19
0.19
0.19
4.7
4.7
4.7
4.7
4.7
4.7
4.7
0.20
0.20
0.20
0.20
0.20
0.20
0.20
5.1
5.1
5.1
5.1
5.1
5.1
5.1
0.026
0.026
0.026
0.026
0.026
0.026
0.026
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.23
0.27
0.27
0.27 250
120
XXXX
0.27
0.27
0.37
Voltage Rating
Current Rating
Date Code
(Contact Littelfuse
for additional
information)
Lead (dia)
Material
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
WARNING:
• Users shall independently assess the suitability of these devices for each of their applications
• Operation of these devices beyond the stated maximum ratings could result in damage to the devices and lead to electrical arcing and/or fire
• These devices are intended to protect against the effects of temporary over-current or over-temperature conditions and are not intended to perform as protective devices where such conditions are expected to be
repetitive or prolonged in duration
• Exposure to silicon-based oils, solvents, electrolytes, acids, and similar materials can adversely affect the performance of these PPTC devices
• These devices undergo thermal expansion under fault conditions, and thus shall be provided with adequate space and be protected against mechanical stresses
• Circuits with inductance may generate a voltage (L di/dt) above the rated voltage of the PPTC device.
Part Ordering Number System
250 R 120 - RA Z R
Packaging Style
Blank: Bulk
R: Tape & Ammo
Quantity Code: F=200 M=1000 U=500 Z=1200
Series
Rx: Resistance Range (x = A-Z or 1-9) [not applicable for all parts]
T: Pre-tripped Device (Optional)
IHOLD Current Code (Refer to Packaging or Electrical Characteristics tables)
R: Radial
Peak Voltage Rating
4
© 2021 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 10/29/21
PolySwitch® Resettable PPTC Datasheet
250R Series
Radial Leaded
Packaging
Part Number
Ordering Number
250R080
250R120
250R120-RA
250R120-RC
250R120-R2
250R145
250R180
250R080U
250R080ZR
250R120U
250R120ZR
250R120-RAZR
250R120-RCZR
250R120-R2ZR
250R145ZR
250R180F
250R180MR
Ihold (A)
Ihold Code
0.080
080
0.120
120
0.120
0.120
0.120
0.145
120
120
120
145
0.180
180
Packaging Option
Quantity
Quantity & Packaging Codes
Bulk
Tape and Ammo
Bulk
Tape and Ammo
Tape and Ammo
Tape and Ammo
Tape and Ammo
Tape and Ammo
Bulk
Tape and Ammo
500
1200
500
1200
1200
1200
1200
1200
200
1000
U
ZR
U
ZR
ZR
ZR
ZR
ZR
F
MR
Tape and Ammo Specifications
Devices taped using EIA468-B/IE286-2 standards. See table below and Figure 1 for details.
Dimension
EIA Mark
IEC Mark
W
W4
W6
W5
D0
H
H0
H1
C1
C2
L1
L
l2
W
W0
W2
W1
D0
H
H0
H1
l1
L
l2
P0
P0
t
t1
Δh
Δp
P1
F
Carrier tape width
Hold down tape width
Top distance between tape edges
Sprocket hole position
Sprocket hole diameter*
Abscissa to plane (straight lead)
Abscissa to plane (kinked lead)
Abscissa to top
Overall width without lead protrusion
Overall width with lead protrusion
Lead protrusion
Protrusion of cut out
Protrusion beyond hold–down tape
Sprocket hole pitch: 250R080–
250R145
Sprocket hole pitch: 250R180
Pitch tolerance
Device pitch: 250R080–250R145
Device pitch: 250R180
Tape thickness
Tape thickness with splice
Splice sprocket hole alignment
Body lateral deviation
Body tape plane deviation
Ordinate to adjacent component lead*
Lead spacing
*Differs from EIA Specification
Dimensions
Dim. (mm)
Tol. (mm)
18
11
3
9
4
18.5
16
32.2
42.5
43.2
1.0
11
Not specified
–0.5 / +1.0
min.
max.
–0.5 / +0.75
–0.32 / +0.2
–/+ 3.0
–/+ 0.5
max.
max.
max.
max.
max.
-
P0
12.7
–/+ 0.3
P0
t
Δh
Δp
P1
F
25.4
20 consecutive.
12.7
25.4
0.9
2.0
0
0
0
3.81
5.1
–/+ 0.5
–/+ 1
max.
max.
–/+ 0.3
–/+ 1.0
–/+ 1.3
–/+ 0.7
–/+ 0.7
Tape and Ammo Diagram
∆h
Figure 1
∆h
∆h
∆p
Reference plane
A1
H1
H1 C1
H C2
F
A
L
H0
B
W4
W5
W
I2
L1
P0
D0
Direction of unreeling
Cross section A - B
t
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.
5
© 2021 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 10/29/21
Reel
Upper side
