250R080U Datasheet, PDF (1/7 Pages) Littelfuse – POLYFUSE® Resettable PTCs

POLYFUSE^® Resettable PTCs
Radial Leaded > 250R Series
250R Series
Agency Approvals
AGENCY AGENCY FILE NUMBER
E183209
R50120008
Description
The 250R Series is designed to protect against short
duration high 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
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range, 60VDC operating
voltage
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resistance ranges available
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Free and Halogen-Free*
Applications
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Equipment (CPE)
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telecom centers
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Electrical Characteristics
Part Number
250R080
I _hold
(A)
0.08
I _trip
V
max
I _max
(A) V / V (A)
int op
0.16 250/60 3
Maximum Time
P_d
To Trip
typ.
(W) ^{Current Time}
(A) (Sec.)
1
0.35
3
Resistance
R
min
(Ω)
14
R
typ
(Ω)
22
R
1max
(Ω)
33
Agency
Approvals
X
X
250R080T
0.08 0.16 250/60 3
1
0.35
3
15
22
33
X
X
250R120
0.12 0.24 250/60 3
1
1
1.5
4
8
16
X
X
250R120-RA
0.12 0.24 250/60 3
1
1
1.0
7
9
16
X
X
250R120-RC
0.12 0.24 250/60 3
1
1
0.85
5.4
7.5
14
X
X
250R120-RF
0.12 0.24 250/60 3
1
1
0.7
6
10.5
16
X
X
250R120-R1
0.12 0.24 250/60 3
1
1
0.8
6
9
16
X
X
250R120-R2
0.12 0.24 250/60 3
1
1
0.7
8
10.5
16
X
X
250R120-R3
0.12 0.24 250/60 3
1
1
1
8
10
16
X
X
250R120T
0.12 0.24 250/60 3
1
1
1.2
7
12
16
X
X
250R145
0.145 0.29 250/60 3
1
1
2.5
3
6
14
X
X
250R145-RA
0.145 0.29 250/60 3
1
1
5
3
5.5
12
X
X
250R145-RB
0.145 0.29 250/60 3
1
1
2.5
4.5
6
14
X
X
250R145T
0.145 0.29 250/60 3
1
1
2.0
5.4
7.5
14
X
X
250R180
0.18 0.65 250/60 10
1.8
1
21
0.8
2.2
4
X
X
250R180T
0.18 0.65 250/60 10
1.8
1
20
1.4
3.9
4.5
X
X
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 23°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 23°C still air.
R _typ = Typical resistance of device in initial (un-soldered) state.
V_int = 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.
V = The device regular operation voltage
op
I = Maximum fault current device can withstand without damage at rated voltage (V )
max
max
Caution: Operation beyond the specified rating may result in damage and possible arcing
and flame.
P = Power dissipated from device when in the tripped state at 23°C still air.
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* Effective January 1, 2010, all 250R PTC products will be manufactured Halogen Free (HF). Existing Non-Halogen Free 250R PTC products may continue to be sold, until supplies are depleted.
© 2010 Littelfuse, Inc
99
250R Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/250R.html for current information.
Revised: July 12, 2010