®
POLY-FUSE Resettable PTCs
Surface Mount > 250S Series
RoHS
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.
Features
• RoHS Compliant,
Directive 2002/95/EC
• Helps meets ITU K.20,
K.21/Telcordia standards
• Lead-Free & Halogen-Free
• Low resistance
• Excellent solder joint
inspectability
Agency Approvals
• High voltage
• Compatible with telecom
standards
AGENCY
AGENCY FILE NUMBER
E183209
Applications
R50120008
• Customer Premises
Equipment (CPE)
• LAN/WAN equipment
• Access equipment
• Central Office (CO)/
telecom centers
Additional Information
Saꢀꢁles
ꢀatasꢁeet
Resꢀꢁꢂꢃes
Electrical Characteristics
Agency
Resistance
Time toTrip at 1A
Device
Mounting
Layout
Approvals
I hold
(A)
I trip
(A)
V max
(Vint /Vop)
I max
(A)
Pd typ.
Part Number
(W)
R min
(Ω)
4
R max
(Ω)
R 1max
(Ω)
Typical Maximum
(Sec.)
(Sec.)
250S130
0.13
0.13
0.13
0.13
0.13
0.26
0.26
0.26
0.26
0.26
250/60
250/60
250/60
250/60
250/60
3
3
3
3
3
1.2
1.2
1.2
1.2
1.2
0.9
4.0
13
20
–
–
–
–
–
250S130–RA
250S130–RB
250S130–RC
250S130V
1.4
0.7
1.1
2.0
4.0
4.0
4.0
4.0
6.5
9
10
13
11
13
15
20
17
20
Horizontal
Vertical
7
4
I hold = Hold current: maximum current device will pass without tripping in 20°C still air.
I trip =Trip current: minimum current at which the device will trip in 20°C still air.
Vint = Maximum voltage the device can withstand without damage at rated current (I max)
Vop= The device regular operation voltage
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.
I max = Maximum fault current device can withstand without damage at rated voltage (Vmax
)
P d = Power dissipated from device when in the tripped state at 20°C still air.
WARNING
• Users shall independently assess the suitability of these devices for each of their
applications
• Exposure to silicon-based oils, solvents, electrolytes, acids, and similar materials can
adversely affect the performance of these PPTC devices
• 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 undergo thermal expansion under fault conditions, and thus shall be
provided with adequate space and be protected against mechanical stresses
•
These devices are intended to protect against the effects of temporary over-current or over-
• Circuits with inductance may generate a voltage (L di/dt) above the rated voltage of the
PPTC device.
temperature conditions and are not intended to perform as protective devices where such
conditions are expected to be repetitive or prolonged in duration
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/22/17