tꢀ
tꢀ
tꢀ
1MVHꢀBOEꢀQMBZꢀQSPUFDUJPOꢀ
for motherboards and
peripherals
1$*ꢀDBSET
(BNFꢀDPOTPMFꢀQPSUꢀ
tꢀ
64#ꢀQFSJQIFSBMT
POLYFUSE® Resettable PTCs
Surface Mount > 1812L Series
1812L Series
Description
The 1812L Series device provides surface mount
overcurrent protection for applications where resettable
protection is desired.
Features
tꢀ
tꢀ
tꢀ
3P)4ꢀDPNQMJBOUꢀBOEꢀꢀꢀ
lead-free
'BTUꢀSFTQPOTFꢀUPꢀGBVMUꢀ
currents
tꢀ
tꢀ
tꢀ
-PXꢀSFTJTUBODF
-PXꢁQSPmMF
$PNQBUJCMFꢀXJUIꢀIJHIꢀ
temperature solders
$PNQBDUꢀEFTJHOꢀTBWFTꢀ
board space
Agency Approvals
Applications
AGENCY
AGENCY FILE NUMBER
E183209
R50119118
protection
Electrical Characteristics
MaximumTime
ToTrip
Agency
Approvals
Resistance
P d
max.
(W)
I hold
(A)
I trip
(A)
V max
(Vdc)
I max
(A)
Part Number*
Marking
R min
(Ω)
R typ
(Ω)
R 1max
(Ω)
Current
(A)
Time
(Sec.)
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
X
X
X
X
X
X
1812L010
1812L014
LF010
LF014
LF020
LF050
LF075
0.10
0.14
0.20
0.50
0.75
0.30
0.34
0.40
1.00
1.50
1.50
1.50
2.20
1.95
1.95
2.50
2.50
3.00
3.00
3.00
2.80
2.80
3.50
5.00
30
60
30
15
13.2
24
33
6
100
10
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.50
1.50
8.00
8.00
8.00
8.00
8.00
8.00
8.00
8.00
8.00
8.00
8.00
8.00
8.00
8.00
8.00
8.00
8.00
1.50
0.15
0.02
0.15
0.20
0.20
0.20
0.30
0.50
0.50
0.40
0.40
0.30
0.50
1.50
1.00
1.00
2.00
2.50
1.600
1.500
0.800
0.150
0.100
0.110
0.110
0.040
0.060
0.060
0.050
0.050
0.040
0.040
0.040
0.030
0.030
0.020
0.015
7.000
4.000
2.900
0.600
0.260
0.200
0.260
0.120
0.120
0.120
0.160
0.090
0.070
0.070
0.070
0.066
0.066
0.040
0.030
15.000
6.000
5.000
1.000
0.450
0.290
0.400
0.210
0.180
0.200
0.250
0.140
0.110
0.110
0.120
0.100
0.100
0.060
0.047
1812L020
100
100
100
100
20
1812L050–C
1812L075–C
1812L075/24
1812L075/33
1812L110–C
1812L110/16
1812L110/33
1812L125–C
1812L125/6
1812L150–C
1812L150/12
1812L150/24
1812L160–C
1812L160/12
1812L200–C
1812L260–C
LF075-24 0.75
LF075-33 0.75
LF110
LF110-16
LF110-33
LF125
1.10
1.10
1.10
1.25
1.25
1.50
1.50
1.50
1.60
1.60
2.00
2.60
100
100
20
16
33
15
6
100
100
100
100
20
LF125-6
LF150
8
LF150-12
LF150-24
LF160
12
24
8
100
100
100
100
LF160-12
LF200
12
8
LF260
6
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.
V max = Maximum voltage device can withstand without damage at rated current (I max)
P d = Power dissipated from device when in the tripped state at 20°C still air.
R min = Minimum resistance of device in initial (un-soldered) state.
R typ =Typical resistance of device in initial (un-soldered) state.
I max = Maximum fault current device can withstand without damage at rated voltage (Vmax
)
R 1max = Maximum resistance of device at 20°C measured one hour after tripping or reflow
soldering of 260°C for 20 sec.
Caution: Operation beyond the specified rating may result in damage and possible arcing and flame.
*Note: Some devices in this product series may have “–C“ in the Part Number. The “–C“ should be omitted when placing orders for the device.
©2008 Littelfuse, Inc.
Revised: October 24, 2008
1812L Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/1812L.html for current information.