POLYFUSE
®
Resettable PTCs
Surface Mount > 250S Series
250S Series
Description
The 250S High Voltage Radial device is a Polymer-based
PTC suitable to protect telephony equipment against
lightining and power cross strikes. The 250S Series is
fully compatible with telecommunications standards, and
is offered in horizontal and new vertical surface mount
package.
Agency Approvals
AGENCY
AGENCY FILE NUMBER
E183209
• RoHS Compliant,
Directive 2002/95/EC
• Lead-Free & Halogen-Free
• Low resistance
• Compatible with telecom
standards
Applications
• Customer Premises
Equipment (CPE)
• Central Office (CO)/
telecom centers
• Helps meets ITU K.20,
K.21/Telcordia standards
• Excellent solder joint
inspectability
• High voltage
• LAN/WAN equipment
• Access equipment
Electrical Characteristics
Device
Mounting
Layout
Time to Trip at 1A
Typical
(Sec.)
0.9
1.4
0.7
1.1
2.0
Maximum
(Sec.)
4.0
4.0
4.0
4.0
4.0
R
min
(Ω)
4
6.5
9
7
4
Resistance
R
max
(Ω)
13
10
13
11
13
R
1max
(Ω)
20
15
20
17
20
Agency
Approvals
Part Number
I
hold
(A)
0.13
I
trip
(A)
0.26
0.26
0.26
0.26
0.26
V
max
(V
int
/V
op
)
250/60
250/60
250/60
250/60
250/60
I
max
(A)
3
3
3
3
3
P
d
typ.
(W)
1.2
1.2
1.2
1.2
1.2
250S130
250S130–RA
250S130–RB
250S130–RC
250S130V
Vertical
Horizontal
–
–
–
–
–
0.13
0.13
0.13
0.13
I
hold
= Hold current: maximum current device will pass without tripping in 23°C still air.
I
trip
= Trip current: minimum current at which the device will trip in 23°C still air.
V
int
= Maximum voltage the device can withstand without damage at rated current (I max)
V
op
= The device regular operation voltage
I
max
= Maximum fault current device can withstand without damage at rated voltage (V
max
)
P
d
= Power dissipated from device when in the tripped state at 23°C still air.
R
min
= Minimum resistance of device in initial (un-soldered) state.
R
max
= Maximum resistance of device in initial (un-soldered) state.
R
1max
= Maximum resistance of device at 20°C measured one hour after tripping.
Caution:
Operation beyond the specified rating may result in damage and possible arcing
and flame.
©2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/250S.html for current information.
57
250S Series
Revised: November 30, 2009
250S Series
Features
POLYFUSE
®
Resettable PTCs
Surface Mount > 250S Series
Temperature Rerating
Ambient Operation Temperature
-40°C
Part Number
250S130
0.21
0.19
0.17
0.13
-20°C
0°C
23°C
40°C
Hold Current (A)
0.11
0.10
0.09
0.07
0.05
50°C
60°C
70°C
85°C
Average Time Current Curves
Temperature Rerating Curve
0.13A
200.00
1000
250S
160.00
Percentage of rated current %
120.00
100
Time in Seconds
80.00
40.00
10
0.00
-40.00
0.00
40.00
80.00
120.00
Device Ambient Temperature ºC
1
Agency Specification Selection Guide For Telecom
and Networking Applications
0.10
0.1
Product
1
10
100
Lightning
ITU K.20/21/45 –
1.5kV 10/700μs
Power Cross
ITU K.20/21/45 –
230Vac, 10Ω
Current in Amperes
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.
250S130
250S130V
250S130-RA
250S130-RB
250S130-RC
Protection Application Guide
Region/
Specification
South America/
Asia/Europe
ITU K.45
Application
Access network equipment
Remote terminal
Repeaters
WAN equipment
Cross –connect
Customer and IT equipment
Analog modems
ADSL, xDSL
Phone sets, PBX systems
Internet appliances
POS terminals
Central Office
POTS/ISDN linecards
T1/E1/J1 linecards
ADSL/VDSL splitters
CSU/DSU
Device
Selection
250S130
250S130V
250S130-RA
250S130-RB
250S130-RC
250S130
250S130V
250S130-RA
250S130-RB
250S130-RC
250S130
250S130V
250S130-RA
250S130-RB
250S130-RC
South America/
Asia/Europe
ITU K.21
South America/
Asia/Europe
ITU K.20
58
250S Series
Revised: November 30, 2009
©2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/250S.html for current information.
POLYFUSE
®
Resettable PTCs
Surface Mount > 250S Series
Soldering Parameters
Profile Feature
Average Ramp-Up Rate (T
S(max)
to T
P
)
Temperature Min (T
s(min)
)
Pb-Free Assembly
3°C/second max
150°C
200°C
60 – 180 secs
217°C
60 – 150 seconds
260
+0/-5
°C
20 – 40 seconds
6°C/second max
8 minutes Max.
-- All temperature refer to topside of the package, measured on the package body surface
-- If reflow temperature exceeds the recommended profile, devices may not meet the
performance requirements
-- Recommended reflow methods: IR, vapor phase oven, hot air oven, N
2
environment
for lead
-- Recommended maximum paste thickness is 0.25mm (0.010inch)
-- Devices can be cleaned using standard industry methods and solvents
-- Devices can be reworked using the standard industry practices
Pre Heat:
Temperature Max (T
s(max)
)
Time (Min to Max) (t
s
)
Time Maintained
Temperature (T
L
)
Above:
Temperature (t
L
)
Peak / Classification Temperature (T
P
)
Time within 5°C of actual peak
Temperature (t
p
)
Ramp-down Rate
Time 25°C to peak Temperature (T
P
)
Physical Specifications
Solder-Plated Copper (Solder Material:
Matte Tin(Sn))
Meets EIA Specification RS186-9E, ANSI/
J-STD-002 Category 3.
Environmental Specifications
Operating/Storage
Temperature
Maximum Device Surface
Temperature in Tripped State
Passive Aging
Humidity Aging
Thermal Shock
Solvent Resistance
Moisture Sensitivity Level
Terminal Material
-40°C to +85°C
Lead Solderability
125°C -/+10ºC
+85°C, 1000 hours
+85°C, 85%,R.H.,1000 hours
MIL–STD–202F Method 107G
,
+125°C to -55°C 10 times
MIL–STD–202, Method 215F
Level 1, J–STD–020C
©2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/250S.html for current information.
59
250S Series
Revised: November 30, 2009
250S Series
POLYFUSE
®
Resettable PTCs
Surface Mount > 250S Series
Dimensions
C
B
A
A
Inch
Max.
mm
Max.
Inch
Max.
H
F
D
E
G
D
E
mm
Max.
Inch
Max.
mm
Max.
G
F
G
mm
Inch
Max.
mm
Max.
Inch
Max.
Soldering Pad Layout
Part
Number
250S130
250S130–RA
250S130–RB
250S130–RC
B
mm
Max.
Inch
Max.
C
mm
Max.
Inch
Max.
H
mm
Max.
Material
Sn/Ni/Cu
Sn/Ni/Cu
Sn/Ni/Cu
Sn/Ni/Cu
Inch
Max. Max.
0.37
0.37
0.37
0.37
9.4
9.4
9.4
9.4
0.15
0.15
0.15
0.15
3.7
3.7
3.7
3.7
0.29
0.29
0.29
0.29
7
.4
7
.4
7
.4
7
.4
0.016
0.016
0.016
0.016
0.4
0.4
0.4
0.4
0.15
0.15
0.15
0.15
3.8
3.8
3.8
3.8
0.18
0.18
0.18
0.18
4.6
4.6
4.6
4.6
0.07
0.07
0.07
0.07
1.8
1.8
1.8
1.8
0.24
0.24
0.24
0.24
6.1
6.1
6.1
6.1
A
C
I
G
B
H
E
C
D
mm
Inch
mm
Inch
G
H
J
D
F
Part
Number
250S130V
A
Inch
mm
Inch
Soldering Pad Layout
B
mm
Inch
E
mm
Inch
F
mm
G
H
I
J
Material
Inch mm Inch mm Inch mm Inch mm
Max. Max. Max. Max. Max. Max. Max. Max.
Max. Max. Max. Max. Max. Max. Max. Max. Max. Max. Max. Max.
.24
6.1
.27
6.9
.13
3.2
.04
1.0
.07
1.9
.09
2.3
Sn/Ni/Cu .09
2.3
.09
2.4
.25
6.4
.14 3.43
Part Ordering Number System
250 S 130 -RA D R
PACKAGING STYLE
R:
Tape
& Reel
QUANTITY CODE: D=1500
OPTION CODE
(BLANK)
= Horizontal / 4-13Ω resistance range
V
= Vertical / 4-13Ω resistance range
-RA
= Horizontal / 6.5-10Ω resistance range
-RB
= Horizontal / 9-13Ω resistance range
-RC
= Horizontal / 7-11Ω resistance range
I
HOLD
CURRENT CODE
(Refer to Electrical Characteristics
Table)
SURFACE MOUNT
PEAK VOLTAGE RATING
Packaging
Part Number
250S130
250S130V
250S130–RA
250S130–RB
250S130–RC
Ordering Number
250S130DR
250S130VDR
250S130–RADR
250S130–RBDR
250S130–RCDR
I
hold
(A)
0.13
0.13
0.13
0.13
0.13
I
hold
Code
130
130
130
130
130
60
250S Series
Revised: November 30, 2009
Packaging
Option
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Quantity
1500
1500
1500
1500
1500
Quantity & Packaging
Code
DR
DR
DR
DR
DR
©2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/250S.html for current information.
POLYFUSE
®
Resettable PTCs
Surface Mount > 250S Series
Tape and Reel Specifications
TAPE SPECIFICATIONS:
EIA-481-1 (mm)
W
F
E
1
D
0
D
1
P
0
P
1
P
2
A
0
B
0
T
max
K
0
Leader Min.
Trailer Min.
16 +/- 0.30
7 +/- 0.05
.5
1.75 +/- 0.10
1.5 +/- 0.05
1.00(MIN)
4.00 +/- 0.10
12.00 +/- 0.10
2.00 +/- 0.05
6.9 +/- 0.10
9.6 +/- 0.10
0.4 +/- 0.10
3.4 +/- 0.15
300
300
REEL DIMENSIONS:
EIA-481-1 (mm)
H
W
D
F
C
H
1
W
1
W
2
W
3
W
4
22.4 +/- 0.05
16.4 .0 +0/+2
Ø60+0.5
Ø13.0+/- 0.2
Ø340+/- 1.0
11+/- 0.5
3.0+0.5
4.0+0.5
5.5+0.5
Tape and Reel Diagram
H
P
1
P
0
D
0
P
2
E
1
W
4
W
3
D
F
W
W
2
C
T
D
2
F
W
1
W
A
0
K
0
B
0
H
1
©2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/250S.html for current information.
61
250S Series
Revised: November 30, 2009
250S Series
2.2+/- 0.5
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