© 2010 Littelfuse, Inc
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/1812L.html for current information.
I
I
V
I
Caution: Operation beyond the specified rating may result in damage and possible arcing and flame.
1 Effective September 15, 2009 onward, all 1812L PTC products will be manufactured Halogen Free (HF). Existing Non-Halogen Free 1812L PTC products will continue to be
sold until supplies are depleted. Effective January 1, 2010, all 1812L PTC product will be manufactured and sold as Halogen Free by default, and the “HF” part number suffix
code will be discontinued -- Refer to Part Ordering Number System and Packaging Options sections for additional information.
2 Some older references to these devices may include “–C“ in the Part Number. The “–C“ should be omitted when placing new orders for the device.
3 Part numbers ending in “TH” refer to new lower profile devices. For these items the “TH” suffix must be included in the ordering instructions.
Please refer also to the Dimensions and Part Ordering Number System sections of this document for additional information. Orders for the original thicker product (No TH in
part number) may be accepted in some instances through October 31, 2009. Please contact Littelfuse for additional information or arrangements.
hold
trip
max
max
Agency Approvals
AGENCY
Electrical Characteristics
1812L200TH
1812L260TH
= Trip current: minimum current at which the device will trip in 20°C still air.
Part Number
= Hold current: maximum current device will pass without tripping in 20°C still air.
= Maximum fault current device can withstand without damage at rated voltage (V
1812L035/30
1812L050/30
1812L075/24
1812L075/33
1812L150/12
1812L150/24
1812L160/12
1812L260/12
1812L110/16
1812L110/24
1812L110/33
1812L125
= Maximum voltage device can withstand without damage at rated current (I max)
1812L125/6
1812L050
1812L075
1812L125
1812L150
1812L160
1812L110
1812L020
1812L300
1812L010
1812L014
/16
2
2
2
2
AGENCY FILE NUMBER
E183209
R50119118
2
2
2,3
2,3
1812L Series
LF035-30
LF050-30
LF075-24
LF075-33
LF150-24
LF260-12
LF110-24
LF110-33
LF125-16
LF150-12
LF160-12
Marking
LF110-16
LF125-6
LF020
LF050
LF075
LF125
LF150
LF160
LF200
LF260
LF300
LF010
LF014
LF110
0.20
0.35
0.50
0.50
0.75
0.75
0.75
2.00
2.60
2.60
3.00
I
0.10
0.14
1.25
1.25
1.25
1.50
1.50
1.50
1.60
1.60
1.10
1.10
1.10
1.10
(A)
hold
3.00
3.00
3.00
5.00
5.00
5.00
0.30
0.34
0.40
0.75
1.00
1.00
1.50
1.50
1.50
2.20
1.95
1.95
1.95
2.50
2.50
2.50
2.80
2.80
3.50
I
(A)
trip
Surface Mount > 1812L Series
POLYFUSE
(Vdc)
V
13.2
30
60
30
30
15
30
24
33
16
24
33
15
16
12
24
12
12
6
6
8
8
8
8
6
max
I
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
(A)
20
20
20
20
10
max
Revised: July 12, 2010
max
typ.
(W)
)
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
0.8
0.8
0.8
0.8
0.8
0.8
P
®
d
39
Resettable PTCs
P
R
R
R
Current
d
min
typ
1max
Description
The 1812L Series PTC provides surface mount overcurrent
protection for applications where resettable protection is
desired.
Features
Applications
Max. Time To Trip
0.50
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
8.00
8.00
8.00
8.00
8.00
8.00
= Power dissipated from device when in the tripped state at 20°C still air.
1.50
(A)
= Typical resistance of device in initial (un-soldered) state.
for motherboards and
peripherals
= Minimum resistance of device in initial (un-soldered) state.
and halogen-free
= Maximum resistance of device at 20°C measured one hour after tripping or reflow
soldering of 260°C for 20 sec.
(Sec.)
Time
0.15
0.02
0.02
0.15
0.15
0.20
0.20
0.20
0.30
0.30
0.50
0.50
0.40
0.40
0.40
0.30
0.50
1.00
1.00
2.00
2.50
5.00
4.00
1.50
1.50
1
0.800
0.800
0.150
0.150
0.100
0.040
0.060
0.060
0.060
0.050
0.050
0.050
0.040
0.040
0.040
0.030
0.030
0.020
1.600
1.500
0.110
0.110
0.015
0.015
0.012
R
(Ω)
Resistance
min
15.000
6.000
5.000
5.000
0.400
0.200
0.200
1.000
1.000
0.450
0.290
0.210
0.180
0.250
0.140
0.140
0.120
0.100
0.100
0.070
0.047
0.055
0.040
0.110
0.110
R
(Ω)
1max
temperature solders
protection
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
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
1812L Series