250R120-R2U Datasheet, PDF (1/7 Pages) Littelfuse – POLY-FUSE® Resettable PTCs Radial Leaded > 250R Series

POLY-FUSE^® 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
t


o

IPME
DVSSFOU

range, 60VDC operating
voltage
t
7"$
JOUFSSVQU
SBUJOH
t
'BTU
UJNFoUPUSJQ
t

#JOOFE
BOE
TPSUFE
OBSSPX

resistance ranges available
t

3P)4
DPNQMJBOU
-FBE
'SFF
BOE
)BMPHFO'SFF

Applications
t

$VTUPNFS
1SFNJTFT

Equipment (CPE)
t

$FOUSBM
0GmDF
$0 

telecom centers
t
-"/8"/
FRVJQNFOU
t
"DDFTT
FRVJQNFOU
Electrical Characteristics
Part Number
250R080
250R080T
250R120
250R120-RA
250R120-RC
250R120-RF
250R120-R1
250R120-R2
250R120-R3
250R120T
250R145
250R145-RA
250R145-RB
250R145T
250R180
250R180T
I _hold
(A)
I _trip
V_max
I _max
(A)
V_int / V_op
(A)
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
Maximum Time
P_d
To Trip
typ.
(W) ^{Current Time}
(A) (Sec.)
1
0.35
3
1
0.35
3
1
1
1.5
1
1
1.0
1
1
0.85
1
1
0.7
1
1
0.8
1
1
0.7
1
1
1
1
1
1.2
1
1
2.5
1
1
5
1
1
2.5
1
1
2.0
1.8
1
21
1.8
1
20
Resistance
R _min
(Ω)
14
15
4
7
5.4
6
6
8
8
7
3
3
4.5
5.4
0.8
1.4
R _typ
(Ω)
R _1max
(Ω)
22
33
22
33
8
16
9
16
7.5
14
10.5
16
9
16
10.5
16
10
16
12
16
6
14
5.5
12
6
14
7.5
14
2.2
4
3.9
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
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

)PME
DVSSFOU
NBYJNVN
DVSSFOU
EFWJDF
XJMM
QBTT
XJUIPVU
USJQQJOH
JO
¡$
TUJMM
BJS

I _trip

5SJQ
DVSSFOU
NJOJNVN
DVSSFOU
BU
XIJDI
UIF
EFWJDF
XJMM
USJQ
JO
¡$
TUJMM
BJS
V_int

.BYJNVN
WPMUBHF
UIF
EFWJDF
DBO
XJUITUBOE
XJUIPVU
EBNBHF
BU
SBUFE
DVSSFOU
*
NBY
V_op= The device regular operation voltage
I _NBY

.BYJNVN
GBVMU
DVSSFOU
EFWJDF
DBO
XJUITUBOE
XJUIPVU
EBNBHF
BU
SBUFE
WPMUBHF
7_NBY)
P _d

1PXFS
EJTTJQBUFE
GSPN
EFWJDF
XIFO
JO
UIF
USJQQFE
TUBUF
BU
¡$
TUJMM
BJS
R _min = Minimum resistance of device in initial (un-soldered) state.
R _typ = Typical resistance of device in initial (un-soldered) state.
R _NBY

.
BYJNVN
SFTJTUBODF
PG
EFWJDF
BU
¡$
NFBTVSFE
POF
IPVS
BGUFS
USJQQJOH
Caution: Operation beyond the specified rating may result in damage and possible arcing
and flame.

&GGFDUJWF
+BOVBSZ


BMM
3
15$
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CF
NBOVGBDUVSFE
)BMPHFO
'SFF
)' 
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/PO)BMPHFO
'SFF
3
15$
QSPEVDUT
NBZ
DPOUJOVF
UP
CF
TPME
VOUJM
TVQQMJFT
BSF
EFQMFUFE

© 2011 Littelfuse, Inc
97
250R Series
Specifications are subject to change without notice.
Revised: August 31, 2011
Please refer to www.littelfuse.com/series/250R.html for current information.