POLYFUSE
®
Resettable PTCs
Radial Leaded
250R Series
Description
• he250Rseriesisdesignedtoprotectagainstshort
T
durationhighvoltagefaultcurrents(powercrossor
powerinductionsurge)typicallyfoundintelecom
applications(250Vrms).Theseriescanbeusedtohelp
telecomnetworkingequipmentmeettheprotection
requirementsspecifiedinITUK.20andK.21.
Features
• oHScompliantand
R
lead-free
•Fasttime-to-trip
• innedandsortednarrow
B
resistancerangesavailable
Applications
• ustomerPremises
C
Equipment(CPE)
• entralOffice(CO)/
C
TelecomCenters
•LAN/WANEquipment
•Accessequipment
• .08–0.18Holdcurrent
0
range,60VDCoperating
voltage
•250VACinterruptrating
Agency Approvals
AGENCY
AGENCY FILE NUMBER
E183209
R50082521
Electrical Characteristics
I
hold
(A)
0.08
0.08
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.145
0.145
0.145
0.145
0.18
0.18
C:coateddevice
Part Number
I
trip
(A)
0.16
0.16
0.24
0.24
0.24
0.24
0.24
0.24
0.24
0.24
0.29
0.29
0.29
0.29
0.65
0.65
V
max
V
int
/ V
op
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
I
max
(A)
3
3
3
3
3
3
3
3
3
3
3
3
3
3
10
10
P
d
max.
(W)
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1.8
1.8
Maximum Time
To Trip
Current
(A)
0.35
0.35
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Time
(Sec.)
3
3
1.5
1.0
0.85
0.7
0.8
0.7
1
1.2
2.5
5
2.5
2.0
21
20
R
min
(Ω)
15
14
4
7
5.4
6
6
8
8
7
3
3
4.5
5.4
0.8
1.4
Resistance
R
typ
(Ω)
22
22
8
9
7.5
10.5
9
10.5
10
12
6
5.5
6
7.5
2.2
3.9
R
1max
(Ω)
33
33
16
16
14
16
16
16
16
16
14
12
14
14
4
4.5
Agency
Approvals
250R080T
250R080
250R120
250R120-RA
250R120-RC
250R120-RF
250R120-R1
250R120-R2
250R120-R3
250R120T
250R145
250R145-RA
250R145-RB
250R145T
250R180
250R180T
*typicalvalue
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
T:pre-trippeddevice
50R Series
Specifications are subject to change without notice.
50
Electronics Designers Guide
www.littelfuse.com
©2006 Littelfuse
POLYFUSE
®
Resettable PTCs
Radial Leaded
Temperature Rerating
Ambient Operation Temperature
-40°C
Part Number
250R080
250R080T
250R120
250R120T
250R145
250R145T
250R180
250R180T
0.12
0.12
0.18
0.18
0.26
0.26
0.28
0.28
250R Series
-20°C
0°C
23°C
40°C
Hold Current (A)
50°C
60°C
70°C
85°C
0.11
0.11
0.16
0.16
0.20
0.20
0.23
0.23
0.09
0.09
0.14
0.14
0.17
0.17
0.21
0.21
0.08
0.08
0.12
0.12
0.145
0.145
0.18
0.18
0.06
0.06
0.10
0.10
0.12
0.12
0.16
0.16
0.05
0.05
0.09
0.09
0.11
0.11
0.13
0.13
0.05
0.05
0.08
0.08
0.09
0.09
0.10
0.10
0.04
0.04
0.06
0.06
0.08
0.08
0.11
0.11
0.03
0.03
0.05
0.05
0.06
0.06
0.083
0.083
Average Time Current Curves
0.120A
0.145A
0.080A
0.180A
Temperature Rerating Curve
170%
150%
Percentage of Rated Current
130%
110%
90%
70%
50%
30%
10%
100000
10000
1000
TIME IN SECONDS
100
10
-40 -30 -20
-10
0
10
20 30
40
Temperature (°C)
50
60
70
80
1
0.100
0.010
0.001
0.02
0.100
1
10
100
CURRENT IN AMPERES
Specifications are subject to change without notice.
Note: 1.00 means the number one with two decimal places.
AKL V3.9 06.05.18
Theaveragetimecurrentcurvesandtemperaturereratingcurveperformanceisaffected
byanumberorvariables,andthesecurvesprovidedasguidanceonly.Customermust
verifytheperformanceintheirapplication.
www.littelfuse.com
©2006 Littelfuse
5
Electronics Designers Guide
50R Series
Specifications are subject to change without notice.
POLYFUSE
®
Resettable PTCs
Radial Leaded
Agency Specification Selection Guide For Telecom and Networking Applications
Product
250R120
250R145
250R180
Lightning
ITUK.20/21/45–1.5kV10/700μs
ITUK.20/21/45–4kV10/700μs*
ITUK.20/21/45–1.5kV10/700μs
ITUK.20/21/45–4kV10/700μs*
TelcordiaGR–974–1.0kV10/1000μs
Power Cross
ITUK.20/21/45–230Vac,10Ω
ITUK.20/21/45–600Vac,600Ω
ITUK.20/21/45–230Vac,10Ω
ITUK.20/21/45–600Vac,600Ω
TelcordiaGR–974-283Vac,10A
*Devicesshouldbeindependentlyevaluatedandtestedforuseinanyspecificapplication
Protection Application Guide
Region/Specification
Application
*Accessnetworkequipment
Remoteterminal
Repeaters
WANequipment
Cross–connect
CustomerandITequipment
Analogmodems
ADSL,xDSL
Phonesets,PBXsystems
Internetappliances
POSterminals
CentralOffice
POTS/ISDNlinecards
T1/E1/J1linecards
ADSL/VDSLsplitters
CSU/DSU
Device Selection
250R180
250R180T
250R145
250R145T
250R120
250R120T
250R180
250R180T
250R145
250R145T
250R120
250R120T
250R180
250R180T
250R145
250R145T
250R120
250R120T
250R180
250R180T
250R145
250R145T
250R120
250R120T
250R180
250R180T
250R145
250R145T
250R120
250R120T
250R080
SouthAmerica/Asia/Europe
ITUK.45
SouthAmerica/Asia/Europe
ITUK.21
SouthAmerica/Asia/Europe
ITUK.20
NorthAmerica
TelcordiaGR-974
SouthAmerica/Asia/Europe
ITUK.20
NorthAmerica
TelcordiaGR-1089
SouthAmerica/Asia/Europe
ITUK.20andK.21
*Primaryprotectionmodules
MDFmodules
Networkinterface
*Intrabuildingcommunicationsystems
LAN,VOIPcards
Localloophandsets
LANIntrabuildingpowercross
Protection
LANequipment,IPphone
*Resistancebinnedpartsarerecommended
50R Series
Specifications are subject to change without notice.
5
Electronics Designers Guide
www.littelfuse.com
©2006 Littelfuse
POLYFUSE
®
Resettable PTCs
Radial Leaded
Soldering Parameters - Wave Soldering
Condition
Peak Temp/ Duration Time
>220°C
Preheat 140°C ~ 180°C
Storage Condition
WaveSoldering
260°C<5Sec
2Sec~20Sec
Temperature (°C)
260
220
Soldering
Cooling
180Sec~210Sec
0°C~35°C<70%RH
• ecommendedsolderingmethods:heatelementovenor
R
N
2
environmentforlead-free.
• evicesaredesignedtobewavesolderedtothebottom
D
sideoftheboard.
• evicescanbecleanedusingstandardindustrymethods
D
andsolvents.
• hisprofilecanbeusedforlead-freedevice
T
Note:
fsolderingtemperaturesexceedtherecommended
I
profile,devicesmaynotmeettheperformance
requirements.
Soldering Parameters - Solder Reflow
Condition
Peak Temp/ Duration Time
>220°C
Preheat 160°C ~ 190°C
Storage Condition
Reflow
260°C>5Sec
30Sec~60Sec
190
160
Preheating
0
180 to 210
2 to 5
Time(s)
20-30
260
220
Temperature (°C)
Soldering
Cooling
60Sec~90Sec
0°C~35°C,<70%RH
• ecommendedreflowmethods:IR,vaporphaseoven,hot
R
airoven,N
2
environmentforlead-free.
• evicesarenotdesignedtobewavesolderedtothe
D
bottomsideoftheboard.
• evicescanbecleanedusingstandardindustrymethods
D
andsolvents.
Note:
freflowtemperaturesexceedtherecommended
I
profile,devicesmaynotmeettheperformance
requirements.
Physical Specifications
Lead Material
Soldering
Characteristics
Insulating Material
Device Labeling
Tin-platedcopper
SolderabilityperMIL-STD-202,
Method208E
Cured,flameretardantepoxypolymer
meetsUL94V-0requirements.
MarkedwithLF,voltage,currentrating,
anddatecode.
190
160
Preheating
0
60 to 90
30 to 60
Time(s)
120
Environmental Specifications
Operating/Storage
Temperature
Maximum Device Surface
Temperature in Tripped State
Passive Aging
Humidity Aging
-40°Cto+85°C
125°C
65°C/85°C,1000hours
+85°C,85%R.H.1000hours
MIL-STD-202FMethod107G
+125°Cto-55°C10times
MIL-STD-202,Method215F
Thermal Shock
Solvent Resistance
www.littelfuse.com
©2006 Littelfuse
5
Electronics Designers Guide
50R Series
Specifications are subject to change without notice.
POLYFUSE
®
Resettable PTCs
Radial Leaded
Dimensions
A
Figure 1
C
A
Figure 2
C
Marking
B
Marking
B
D
D
E
F
E
F
Figure
A
B
Inches
Max.
0.39
Littelfuse
Trademark
Figure
C
D
E
mm
C
Part Number
250R080
250R080T
250R120
250R120-RA
250R120-RC
250R120-RF
250R120-R1
D
250R120-R2
Figure 1
Inches mm
A
Max.
0.23
mm
Max.
9.9
080
XXXX
Inches
Max.
0.18
Voltage Rating
Current Rating
Date Code
(Contact Littelfuse
for additional
information)
mm
Max.
A
4.6
4.6
3.8
4.6
4.6
4.6
4.6
4.6
4.6
E
4.6
4.6
4.6
4.6
4.6
4.6
Inches
Figure 2
Inches
mm
Min.
0.19
Littelfuse
Trademark
Physical Characteristics
Lead (dia)
Inches
0.026
0.026
0.026
0.026
0.026
0.026
0.026
0.026
0.026
0.026
0.026
0.026
0.026
0.026
0.026
0.026
mm
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
Typ.
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
F
Max.
C
5.8
5.8
6.5
6.5
6.5
6.5
6.5
6.5
6.5
6.5
6.5
6.5
6.5
6.5
9.5
9.5
Min.
4.7
120
XXXX
Typ.
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
Material
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Figure
1
1
2
2
2
2
2
2
2
2
2
2
2
2
1
1
0.23
Marking
0.39
0.43
0.43
0.43
0.43
0.43
0.43
0.43
0.43
0.43
0.43
0.43
0.43
0.47
0.47
B
250
9.9
11
11
11
11
11
11
11
11
11
11
11
11
12
12
0.18
0.15
0.18
0.18
0.18
0.18
0.18
0.18
0.18
0.18
0.18
0.18
0.18
0.18
0.18
D
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
250
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
B
0.26
0.26
0.26
0.26
0.26
0.26
0.26
Marking
0.19
4.6
Voltage Rating
Current Rating
Date Code
(Contact Littelfuse
for additional
information)
250R120-R3
250R120T
250R145
250R145-RA
250R145-RB
250R145T
250R180
250F180T
E
0.26
0.26
0.26
0.26
0.26
0.37
0.37
F
Part Marking System
250
Littelfuse
Trademark
Littelfuse
Trademark
080
XXXX
Voltage Rating
Current Rating
Date Code
(Contact Littelfuse
for additional
information)
120
XXXX
250
Voltage Rating
Current Rating
Date Code
(Contact Littelfuse
for additional
information)
50R Series
Specifications are subject to change without notice.
5
Electronics Designers Guide
www.littelfuse.com
©2006 Littelfuse
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