250R_06 Datasheet, PDF (1/6 Pages) Littelfuse – POLYFUSE Resettable PTCs Radial Leaded

POLYFUSE^® Resettable PTCs
Radial Leaded
250R Series
Agency Approvals
AGENCY AGENCY FILE NUMBER
E183209
R50082521
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
• 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
Applications
• Customer Premises
Equipment (CPE)
• Central Office (CO)/
Telecom Centers
• LAN/WAN Equipment
• Access equipment
Electrical Characteristics
Part Number
I _hold
(A)
I _trip
V_max
I _max
(A)
V_int / V_op
(A)
250R080T
250R080
250R120
250R120-RA
250R120-RC
250R120-RF
250R120-R1
250R120-R2
250R120-R3
250R120T
250R145
250R145-RA
250R145-RB
250R145T
250R180
250R180T
0.08 0.16 250/60 3
0.08 0.16 250/60 3
0.12 0.24 250/60 3
0.12 0.24 250/60 3
0.12 0.24 250/60 3
0.12 0.24 250/60 3
0.12 0.24 250/60 3
0.12 0.24 250/60 3
0.12 0.24 250/60 3
0.12 0.24 250/60 3
0.145 0.29 250/60 3
0.145 0.29 250/60 3
0.145 0.29 250/60 3
0.145 0.29 250/60 3
0.18 0.65 250/60 10
0.18 0.65 250/60 10
*typical value
C: coated device
T: pre-tripped device
P_d
max.
(W)
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1.8
1.8
Maximum Time
To Trip
Current Time
(A) (Sec.)
0.35
3
0.35
3
1
1.5
1
1.0
1
0.85
1
0.7
1
0.8
1
0.7
1
1
1
1.2
1
2.5
1
5
1
2.5
1
2.0
1
21
1
20
Resistance
R _min
(Ω)
15
14
4
7
5.4
6
6
8
8
7
3
3
4.5
5.4
0.8
1.4
R _typ
(Ω)
22
22
8
9
7.5
10.5
9
10.5
10
12
6
5.5
6
7.5
2.2
3.9
R _1max
(Ω)
33
33
16
16
14
16
16
16
16
16
14
12
14
14
4
4.5
Agency
Approvals
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
250R Series
Specifications are subject to change without notice.

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