POLY-FUSE
®
Resettable PTCs
Surface Mount > 1812L Series
1812L Series
Description
RoHS
The 1812L Series PTC provides surface mount overcurrent
protection for applications where resettable protection is
desired.
Features
• RoHS compliant, lead-free
and halogen-free
• Fast response
• Compact design
Agency Approvals
AGENCY
AGENCY FILE NUMBER
• Low resistance
• Low-profile
• Compatible with high
temperature solders
Applications
• Plug and play protection
for motherboards and
peripherals
• USB peripherals
• PCI cards
• Game console port
protection
E183209
R50119118
Electrical Characteristics
Part Number
1812L010
1812L010/60
1812L014
1812L020
1812L020/60
1812L035/30
1812L035/60
1812L050
1
1812L050/30
1812L050/60
1812L075
1
1812L075/24
2
1812L075/33
1812L110
1
1812L110/16
1812L110/24
1812L110/33
1812L125/6
1812L125
/16
1812L150
1
1812L150/12
1812L150/16
1812L150/24
2
1812L160
1
1812L160/12
1812L200TH
1
Marking
LF010
LF010-60
LF014
LF020
LF020-60
LF035-30
LF035-60
LF050
LF050-30
LF050-60
LF075
LF075-24
LF075-33
LF110
LF110-16
LF110-24
LF110-33
LF125-6
LF125
LF150
LF150-12
LF150-16
LF150-24
LF160
LF160-12
LF200
I
hold
(A)
0.10
0.10
0.14
0.20
0.20
0.35
0.35
0.50
0.50
0.50
0.75
0.75
0.75
1.10
1.10
1.10
1.10
1.25
1.25
1.50
1.50
1.50
1.50
1.60
1.60
2.00
I
trip
(A)
0.30
0.30
0.34
0.40
0.40
0.75
0.70
1.00
1.00
1.00
1.50
1.50
1.50
2.20
1.95
1.95
1.95
2.50
2.50
3.00
3.00
2.80
3.00
2.80
2.80
3.50
V
max
(Vdc)
30
60
60
30
60
30
60
15
30
60
13.2
24
33
8
16
24
33
6
16
8
12
16
24
8
12
8
I
max
(A)
100
10
10
100
40
40
10
100
100
10
100
100
20
100
100
20
20
100
100
100
100
100
20
100
100
100
P
d
typ.
(W)
0.8
0.8
0.8
0.8
0.8
0.8
1.00
0.8
0.8
1.50
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
Max. Time To Trip
Current
(A)
Time
(Sec.)
Resistance
R
min
(Ω)
R
1max
(Ω)
Agency Approvals
0.50
0.50
1.50
8.00
1.00
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
1.50
1.50
0.15
0.02
2.00
0.15
0.15
0.15
0.15
0.15
0.20
0.20
0.20
0.30
0.30
0.50
0.50
0.40
0.40
0.30
0.50
0.50
1.50
1.00
1.00
2.00
1.600
1.600
1.500
0.800
1.400
0.400
0.400
0.150
0.150
0.150
0.100
0.110
0.110
0.040
0.060
0.060
0.060
0.050
0.050
0.040
0.040
0.040
0.040
0.030
0.030
0.020
15.000
15.000
6.000
5.000
4.400
1.700
1.700
1.000
1.000
1.000
0.450
0.290
0.400
0.210
0.180
0.200
0.200
0.140
0.140
0.110
0.110
0.110
0.120
0.100
0.100
0.070
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
X
X
continues on next page.
I
hold
= Hold current: maximum current device will pass without tripping in 20°C still air.
R
min
= Minimum resistance of device in initial (un-soldered) state.
I
trip
= Trip current: minimum current at which the device will trip in 20°C still air.
R
typ
= Typical resistance of device in initial (un-soldered) state.
V
max
= Maximum voltage device can withstand without damage at rated current (I max)
R
1max
= Maximum resistance of device at 20°C measured one hour after tripping or reflow
soldering of 260°C for 20 sec.
I
max
= Maximum fault current device can withstand without damage at rated voltage (V
max
)
P
d
= Power dissipated from device when in the tripped state at 20°C still air.
Caution:
Operation beyond the specified rating may result in damage and possible arcing and flame.
1
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.
© 2017 Littelfuse, Inc.
2
Part Number with note 2 tested and complied with AEC Q200.
Specifications are subject to change without notice.
Revised: 07/21/17
POLY-FUSE
®
Resettable PTCs
Surface Mount > 1812L Series
Electrical Characteristics
Part Number
1812L200/12
1812L200/16
1812L260TH
1
1812L260/12
1812L260/16
1812L300
Marking
LF200-12
LF200-16
LF260
LF260-12
LF260-16
LF300
I
hold
(A)
2.00
2.00
2.60
2.60
2.60
3.00
I
trip
(A)
3.50
3.50
5.20
5.00
5.00
5.00
V
max
(Vdc)
12
16
8
12
16
6
I
max
(A)
100
100
100
100
100
100
P
d
typ.
(W)
1.0
1.0
0.8
0.8
1.2
0.8
Max. Time To Trip
Current
Time
(A)
(Sec.)
Resistance
R
min
R
1max
(Ω)
(Ω)
Agency Approvals
8.00
8.00
8.00
8.00
8.00
8.00
2.00
2.00
2.50
5.00
5.00
4.00
0.020
0.020
0.015
0.015
0.015
0.012
0.070
0.070
0.047
0.055
0.050
0.040
X
X
X
X
X
X
X
X
X
X
X
X
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)
I
max
= Maximum fault current device can withstand without damage at rated voltage (V
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.
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.
1
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.
2
Part Number with note 2 tested and complied with AEC Q200.
Temperature Rerating
Ambient Operation Temperature
-40°C
Part Number
1812L010
1812L010/60
1812L014
1812L020
1812L020/60
1812L035/30
1812L035/60
1812L050
1812L050/30
1812L050/60
1812L075
1812L075/24
1812L075/33
1812L110
1812L110/16
1812L110/24
1812L110/33
1812L125/6
1812L125/16
1812L150
1812L150/12
1812L150/16
1812L150/24
1812L160
1812L160/12
1812L200TH
1812L200/12
1812L200/16
1812L260TH
1812L260/12
1812L260/16
1812L300
0.16
0.14
0.23
0.29
0.29
0.50
0.52
0.77
0.77
0.72
1.15
1.06
1.10
1.59
1.58
1.55
1.55
2.00
2.00
2.06
2.04
2.04
2.05
2.20
2.20
2.60
2.80
2.80
3.40
3.40
3.66
4.13
0.14
0.13
0.19
0.26
0.26
0.45
0.46
0.68
0.68
0.66
1.01
0.95
1.00
1.43
1.43
1.40
1.40
1.75
1.75
1.93
1.88
1.88
1.87
2.06
2.06
2.44
2.60
2.60
3.16
3.16
3.30
3.75
0.12
0.11
0.17
0.23
0.23
0.40
0.40
0.59
0.59
0.57
0.88
0.84
0.88
1.26
1.27
1.25
1.25
1.52
1.52
1.79
1.68
1.68
1.67
1.91
1.91
2.22
2.36
2.36
3.00
3.00
2.96
3.30
0.10
0.10
0.14
0.20
0.20
0.35
0.35
0.50
0.50
0.50
0.75
0.75
0.75
1.10
1.10
1.10
1.10
1.25
1.25
1.50
1.50
1.50
1.50
1.60
1.60
2.00
2.00
2.00
2.60
2.60
2.60
3.00
-20°C
0°C
20°C
40°C
Hold Current (A)
0.08
0.09
0.12
0.17
0.17
0.30
0.30
0.44
0.44
0.44
0.65
0.60
0.66
0.95
0.95
0.93
0.93
1.00
1.00
1.28
1.25
1.25
1.25
1.36
1.36
1,78
1.72
1.72
2.30
2.30
2.23
2.61
0.07
0.08
0.10
0.15
0.15
0.26
0.26
0.40
0.40
0.39
0.60
0.55
0.60
0.87
0.85
0.83
0.83
0.95
0.95
1.10
1.10
1.10
1.08
1.17
1.17
1.67
1.56
1.56
2.15
2.15
2.06
2.43
0.06
0.07
0.09
0.14
0.14
0.24
0.24
0.37
0.37
0.35
0.55
0.50
0.56
0.80
0.77
0.73
0.73
0.90
0.90
1.02
1.00
1.00
0.95
1.09
1.09
1.50
1.40
1.40
2.00
2.00
1.89
2.25
0.05
0.07
0.08
0.12
0.12
0.20
0.19
0.33
0.33
0.31
0.49
0.45
0.47
0.71
0.71
0.63
0.63
0.75
0.75
0.80
0.80
0.80
0.77
0.85
0.85
1.45
1.20
1.20
1.85
1.85
1.61
2.00
0.03
0.05
0.06
0.10
0.10
0.16
0.15
0.29
0.29
0.24
0.43
0.37
0.36
0.60
0.58
0.50
0.50
0.53
0.53
0.68
0.60
0.60
0.60
0.72
0.72
1.29
1.04
1.04
1.63
1.63
1.30
1.78
50°C
60°C
70°C
85°C
Notes: The temperature rerating data is only for reference, please contact Littelfuse technical support for detail temperature rerating information.
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 07/21/17
POLY-FUSE
®
Resettable PTCs
Surface Mount > 1812L Series
Temperature Rerating Curve
170%
150%
Percentage of Rated Current
130%
110%
90%
70%
50%
30%
10%
-40
-30 -20
-10
0
10
20 30
40
Temperature (°C)
50
60
70
80 85
Physical Specifications
Terminal Material
Lead Solderability
Solder-Plated Copper (Solder Material:
Matte Tin (Sn))
Meets EIA Specification RS186-9E, ANSI/
J-STD-002 Category 3.
Environmental Specifications
Operating/Storage Temp.
-40°C to +85°C
Max. Device Surface Temp.
125°C
in Tripped State
Passive Aging
Humidity Aging
Thermal Shock
Solvent Resistance
Vibration
Moisture Level Sesitivity
+85°C, 1000 hours
-/+5% typical resistance change
+85°C, 85% R.H.,1000 hours
-/+5% typical resistance change
MIL–STD–202, Method 107
+85°C/-40°C 20 times
-30% typical resistance change
MIL–STD–202, Method 215,
No change
MIL–STD–883, Method 2007
,
Condition A, No change
Level 1, J–STD–020
Note:
Typical Temperature rerating curve, refer to table for derating data
Soldering Parameters
Profile Feature
Average Ramp-Up Rate (T
S(max)
to T
P
)
Temperature Min (T
s(min)
)
Pb-Free Assembly
3°C/second max
150°C
200°C
T
P
T
L
Ramp-up
t
P
Critical Zone
t
L
to t
P
Pre Heat:
Temperature Max (T
s(max)
)
Time (Min to Max) (t
s
)
T
S(max)
t
L
Ramp-do
Ramp-down
Preheat
Time Maintained
Temperature (T
L
)
Above:
Temperature (t
L
)
Peak / Classification Temperature (T
P
)
Time within 5°C of actual peak
Temperature (t
p
)
Ramp-down Rate
Time 25°C to peak Temperature (T
P
)
217°C
60 – 150 seconds
260
+0/-5
°C
20 – 40 seconds
6°C/second max
8 minutes Max.
Temperature
60 – 180 secs
T
S(min)
25
t
S
time to peak temperature
Time
-- All temperature refer to topside of the package, measured on the package body surface
-- If reflow temperature exceeds the recommended profile, devices may not meet the
performance requirements
-- Recommended reflow methods: IR, vapor phase oven, hot air oven, N
2
environment
for lead
-- Recommended maximum paste thickness is 0.25mm (0.010inch)
-- Devices can be cleaned using standard industry methods and solvents
-- Devices can be reworked using the standard industry practices
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 07/21/17
POLY-FUSE
®
Resettable PTCs
Surface Mount > 1812L Series
Average Time Current Curves
0.50A
0.75A
1.10A
1.10A/16V
1.25A/6V
1.25A/16V
1.50A
1.50A/12V
1.60A
2.00A
0.50A
2.60A, 2.60A/12V
0.75A
2.60A/16V
1.10A
3.00A
1.10A/16V
1.25A/6V
1.25A/16V
1.50A
1.50A/12V
1.60A
2.00A
2.60A, 2.60A/12V
2.60A/16V
3.00A
100
100
1812L
1812L
0.10/60
0.10
0.20/60
0.14
0.20
0.35/30
0.35/60
0.50/30
0.50/60
0.10/60
0.75/33
0.10
0.75/24
0.20/60
1.10/33
0.14
1.10/24
0.20
1.50/24
0.35/30
2.00/12
0.35/60
0.50/30
0.50/60
0.75/33
0.75/24
1.10/33
1.10/24
1.50/24
2.00/12
100
100
1812L
1812
10
10
10
10
Time in Seconds
Time in Seconds
Time in Seconds
1
Time in Seconds
1
1
0.1
0.1
0.1
0.1
0.01
0.1
1
0.01
0.1
10
1
100
10
100
0.01
0.1
0.01
0.1
10
1
100
10
1
Current in Amperes Current in Amperes
The average time current curves and Temperature Rerating curve performance is affected
by a number or variables, and these curves provided as guidance only. Customer must
verify the performance in their application.
Current in Amperes Current in Amperes
Additional Information
Datasheet
Resources
Samples
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 07/21/17
POLY-FUSE
®
Resettable PTCs
Surface Mount > 1812L Series
Dimensions
MARKING CODE VARIES
WITH AMPERAGE AND VOLTAGE RATING
(See Electrical Characteristics Table)
SHOWN ARE:
- 1.1A/6V RATING (LEFT)
- 1.1A/33V RATING (RIGHT)
A
C
Top
View
110
110
D
B
110
-33
Side
View
Bottom
View
Pad
Layout
E
3.45 mm
(.135”)
3.15 mm
(.124”)
1.78mm
(.070”)
Part
Number
1812L010
1812L010/60
1812L014
1812L020
1812L020/60
1812L035/30
1812L035/60
1812L050
1812L050/30
1812L050/60
1812L075
1812L075/24
1812L075/33
1812L110
1812L110/24
1812L110/16
1812L110/33
1812L125/6
1812L125/16
1812L150
1812L150/12
1812L150/16
1812L150/24
1812L160
1812L160/12
1812L200TH
1812L200/12
1812L200/16
1812L260TH
1812L260/12
1812L260/16
1812L300
A
Inches
0.17
0.17
0.17
0.17
0.17
0.17
0.17
0.17
0.17
0.17
0.17
0.17
0.17
0.17
0.17
0.17
0.17
0.17
0.17
0.17
0.17
0.17
0.17
0.17
0.17
0.17
0.17
0.17
0.17
0.17
0.18
0.17
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
B
mm
4.37
4.37
4.37
4.37
4.37
4.37
4.37
4.37
4.37
4.37
4.37
4.37
4.37
4.37
4.37
4.37
4.37
4.37
4.37
4.37
4.37
4.37
4.37
4.37
4.37
4.37
4.37
4.37
4.37
4.37
4.54
4.37
4.73
4.73
4.73
4.73
4.73
4.73
4.73
4.73
4.73
4.73
4.73
4.73
4.73
4.73
4.73
4.73
4.73
4.73
4.73
4.73
4.73
4.73
4.73
4.73
4.73
4.73
4.73
4.73
4.73
4.73
4.90
4.73
C
mm
Inches
0.03
0.03
0.03
0.02
0.03
0.02
0.05
0.02
0.02
0.05
0.02
0.03
0.03
0.02
0.02
0.03
0.05
0.02
0.03
0.02
0.03
0.03
0.03
0.02
0.03
0.03
0.03
0.02
0.03
0.05
0.02
0.05
0.05
0.08
0.04
0.05
0.04
0.07
0.03
0.04
0.07
0.03
0.05
0.06
0.03
0.04
0.05
0.08
0.03
0.05
0.03
0.05
0.05
0.07
0.03
0.05
0.05
0.05
0.04
0.05
0.08
0.06
D
mm
0.75
0.75
0.75
0.55
0.75
0.6
1.2
0.5
0.5
1.2
0.5
0.75
0.75
0.50
0.75
1.20
0.75
0.75
0.75
0.80
0.75
0.80
0.80
0.50
0.80
1.20
0.50
1.25
1.25
1.95
1.00
1.25
1.25
1.8
0.75
1.00
1.8
0.75
1.20
1.55
1.07
1.25
2.00
1.25
1.25
1.25
1.8
1.25
0.6
E
mm
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
1.2
1.2
1.2
1.2
1.20
1.20
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
Inches
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
Inches
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
Inches
Min
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
1.2
0.01
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.02
0.03
0.03
0.02
0.03
0.03
0.02
0.03
0.03
0.03
0.03
0.02
0.03
0.03
0.03
0.03
0.03
0.01
0.02
mm
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.50
0.65
0.65
0.50
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
Min Max Min Max Min Max Min Max Min
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.13 3.07 3.41
0.14
3.16 3.50
0.13 3.07 3.41
Max Min Max Min Max Min Max
Max Min Max
0.50 0.71
0.45 0.75
0.40 0.71
0.40 0.75
0.13 3.07 3.41 0.008 0.024 0.20
1.20 0.012 0.047
1.20 0.012 0.047
1.00
1.34
1.50
0.01
0.01
0.01
0.05
0.05
0.05
0.01 0.026 0.15
0.01 0.026 0.15
0.01
0.01
0.01
0.02
0.03
0.03
0.15
0.15
0.15
0.15
2.00 0.012 0.047
0.006 0.03
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 07/21/17
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