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.
PRELIMINARY DATA SHEET: This product is scheduled for
release by end of 2008 and specifications may change.
Please refer to www.littelfuse.com/series/250S.html for
the current information.
Features
Agency Approvals
AGENCY
AGENCY FILE NUMBER
Pending
Directive 2002/95/EC
inspectability
standards
Applications
Electrical Characteristics
Time to Trip at 1A
P
d
typ.
(W)
Typical Maximum
(Sec.)
(Sec.)
1.2
1.2
1.2
1.2
0.9
1.4
0.7
1.1
4.0
4.0
4.0
4.0
Resistance
R
min
(Ω)
4.0
6.5
9
7
R
max
(Ω)
13
10
13
11
R
1max
(Ω)
20
15
20
17
Agency
Approvals
Part Number
I
hold
(A)
0.13
0.13
0.13
0.13
I
trip
(A)
0.26
0.26
0.26
0.26
V
max
(V
int
/V
op
)
250/60
250/60
250/60
250/60
I
max
(A)
3
3
3
3
250S130
250S130–RA
250S130–RB
250S130–RC
–
–
–
–
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.
105
Revised: April 3, 2009
250S Series
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
0.13A
Temperature Rerating Curve
200.00
1000
250S
160.00
Percentage of rated current %
120.00
100
80.00
Time in Seconds
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
Product
Lightning
Power Cross
0.10
0.1
1
10
100
Current in Amperes
250S130
250S130-RA
250S130-RB
250S130-RC
1.5kV 10/700μs
The average time current curves and Temperature Rerating curve performance is affected
verify the performance in their application.
Protection Application Guide
Region/
Specification
South America/
Asia/Europe
Device
Selection
250S130
250S130-RA
250S130-RB
250S130-RC
250S130
250S130-RA
250S130-RB
250S130-RC
250S130
250S130-RA
250S130-RB
250S130-RC
Application
Access network equipment
Remote terminal
Repeaters
WAN equipment
Cross –connect
Customer and IT equipment
Analog modems
South America/
Asia/Europe
South America/
Asia/Europe
Internet appliances
POS terminals
Central Office
POTS/ISDN linecards
T1/E1/J1 linecards
ADSL/VDSL splitters
250S Series
106
Revised: April 3, 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
S(max)
Pb-Free Assembly
to T
P
)
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.
performance requirements
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
2
Temperature Min (T
s(min)
)
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
)
environment
Physical Specifications
Solder-Plated Copper (Solder Material:
Matte Tin(Sn))
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
+125°C to -55°C 10 times
Terminal Material
Lead Solderability
-40°C to +85°C
125°C -/+10ºC
©2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/250S.html for current information.
107
Revised: April 3, 2009
250S Series
POLYFUSE
®
Resettable PTCs
Surface Mount > 250S Series
Dimensions
H
C
B
D
A
E
F
G
G
Recommended PCB Pad Layout
F
G
H
Physical
Inch mm Inch mm Inch mm Inch mm Inch mm Characteristics Inch mm Inch mm Inch mm
Material
Max. Max. Max. Max. Max. Max. Max. Max. Max. Max.
Max. Max. Max. Max. 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
Sn/Ni/Cu
Sn/Ni/Cu
Sn/Ni/Cu
Sn/Ni/Cu
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
B
C
D
E
Part
Number
250S130
250S130–RA
250S130–RB
250S130–RC
Part Ordering Number System
250 S 130 - RA D R
PACKAGING STYLE
R:
Tape
& Ammo
QUANTITY CODE:
D=1500
RESISTANCE RANGE
BLANK
-RA
-RB
-RC
I
HOLD
CURRENT CODE
(Refer to Electrical Characteristics
Table)
SURFACE MOUNT
PEAK VOLTAGE RATING
Packaging
Part Number
250S130
250S130–RA
250S130–RB
250S130–RC
Ordering Number
250S130DR
250S130–RADR
250S130–RBDR
250S130–RCDR
I
hold
(A)
0.13
0.13
0.13
0.13
I
hold
Code
130
130
130
130
Packaging
Option
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Quantity
1500
1500
1500
1500
Quantity & Packaging
Code
DR
DR
DR
DR
250S Series
108
Revised: April 3, 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
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
2.2+/- 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.
109
Revised: April 3, 2009
250S Series
Power technology
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