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250R Datasheet(PDF) 1 Page - Littelfuse

Part No. 250R
Description  POLYFUSE Resettable PTCs Radial Leaded
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Maker  LITTELFUSE [Littelfuse]
Homepage  http://www.littelfuse.com
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250R Datasheet(HTML) 1 Page - Littelfuse

   
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©2006 Littelfuse
250R Series
Specifications are subject to change without notice.

Electronics Designers Guide
POLYFUSE® Resettable PTCs
Radial Leaded
• 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.
Electrical Characteristics
Part Number
I
hold
(A)
I
trip
(A)
V
max
V
int / Vop
I
max
(A)
P
d
max.
(W)
Maximum Time
To Trip
Resistance
Agency
Approvals
Current
(A)
Time
(Sec.)
R
min
(
Ω)
R
typ
(
Ω)
R
1max
(
Ω)
250R080T
0.08
0.16
250/60
3
1
0.35
3
15
22
33
X
X
250R080
0.08
0.16
250/60
3
1
0.35
3
14
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
*typical value
C: coated device
T: pre-tripped device
Description
Features
Applications
• RoHS compliant and
lead-free
• Fast time-to-trip
• Binned and sorted narrow
resistance ranges available
• 0.08 – 0.18 Hold current
range, 60VDC operating
voltage
• 250VAC interrupt rating
• Customer Premises
Equipment (CPE)
• Central Office (CO)/
Telecom Centers
• LAN/WAN Equipment
• Access equipment
250R Series
Agency Approvals
AGENCY
AGENCY FILE NUMBER
E183209
R50082521


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