POLYFUSE
®
Resettable PTCs
Surface Mount
1812L Series
Description
The 1812L series device provides surface mount
overcurrent protection for applications where resettable
protection is desired.
Features
• RoHS compliant and
lead-free
• Fast response to fault
currents
• Compact design saves
board space
Applications
• Plug and play protection
for motherboards and
peripherals
• USB peripherals
• PCI cards
• Game console port
protection
• Low resistance
• Low-profile
• Compatible with high
temperature solders
Agency Approvals
AGENCY
AGENCY FILE NUMBER
E183209
R50082521
Electrical Characteristics
I
hold
(A)
0.10
0.14
0.20
0.50
0.75
0.75
0.75
1.10
1.10
1.10
1.25
1.25
1.50
1.50
1.50
1.60
I
trip
(A)
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
V
max
(Vdc)
30
60
30
15
13.2
24
33
6
16
33
15
6
8
12
24
8
I
max
(A)
100
10
100
100
100
100
20
100
100
20
100
100
100
100
20
100
P
d
max.
(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
Maximum Time
To Trip
Current
(A)
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
Time
(Sec.)
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
R
min
(Ω)
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
Resistance
R
typ
(Ω)
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
R
1max
(Ω)
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
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
Agency
Approvals
Part Number
Marking
1812L010
1812L014
1812L020
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
LF010
LF014
LF020
LF050
LF075
LF075-24
LF075-33
LF110
LF110-16
LF110-33
LF125
LF125-6
LF150
LF150-12
LF150-24
LF160
1812L Series
Specifications are subject to change without notice.
1
Electronics Designers Guide
www.littelfuse.com
©2006 Littelfuse
POLYFUSE
®
Resettable PTCs
Surface Mount
Electrical Characteristics (continued)
I
hold
(A)
1.60
2.00
2.60
I
trip
(A)
2.80
3.50
5.00
V
max
(Vdc)
12
8
6
I
max
(A)
100
100
100
P
d
max.
(W)
0.8
0.8
0.8
Maximum Time
To Trip
Current
(A)
8.00
8.00
8.00
Time
(Sec.)
1.00
2.00
2.50
R
min
(Ω)
0.030
0.020
0.015
Resistance
R
typ
(Ω)
0.066
0.040
0.030
R
1max
(Ω)
0.100
0.060
0.047
X
X
X
X
X
X
Agency
Approvals
Part Number
Marking
1812L160/12
1812L200-C
1812L260-C
LF160-12
LF200
LF260
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.
Temperature Rerating
Ambient Operation Temperature
-40°C
Part Number
1812L010
1812L014
1812L020
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
0.16
0.23
0.29
0.77
1.15
1.06
1.10
1.59
1.58
1.55
2.00
2.00
2.06
2.04
2.05
2.20
2.18
3.08
4.00
0.14
0.19
0.26
0.68
1.01
0.95
1.00
1.43
1.43
1.40
1.75
1.75
1.93
1.88
1.87
2.06
2.01
2.71
3.52
0.12
0.17
0.23
0.59
0.88
0.84
0.88
1.26
1.27
1.25
1.52
1.52
1.79
1.68
1.67
1.91
1.79
2.35
3.06
0.10
0.14
0.20
0.50
0.75
0.75
0.75
1.10
1.10
1.10
1.25
1.25
1.50
1.50
1.50
1.60
1.60
2.00
2.60
-20°C
0°C
23°C
40°C
Hold Current (A)
0.08
0.12
0.17
0.44
0.65
0.60
0.66
0.95
0.95
0.93
1.00
1.00
1.28
1.25
1.25
1.36
1.34
1.80
2.34
0.07
0.10
0.15
0.40
0.60
0.55
0.60
0.87
0.85
0.83
0.95
0.95
1.10
1.10
1.08
1.17
1.16
1.60
2.08
0.06
0.09
0.14
0.37
0.55
0.50
0.56
0.80
0.77
.073
0.90
0.90
1.02
1.00
0.95
1.09
1.07
1.50
1.95
0.05
0.08
0.12
0.33
0.49
0.45
0.47
0.71
0.71
.063
0.75
0.75
0.80
0.80
0.77
0.85
0.83
1.07
1.39
0.03
0.06
0.10
0.29
0.43
0.37
0.36
0.60
0.58
.050
0.53
0.53
0.68
0.60
0.60
0.72
0.60
0.80
1.04
50°C
60°C
70°C
85°C
1812L Series
Specifications are subject to change without notice.
2
Electronics Designers Guide
www.littelfuse.com
©2006 Littelfuse
POLYFUSE
®
Resettable PTCs
Surface Mount
Average Time Current Curves
1812L Series
Temperature Rerating Curve
100000
10000
1000
TIME IN SECONDS
100
10
1
0.100
0.010
0.001
0.02
0.100
1
10
100
CURRENT IN AMPERES
Specifications are subject to change without notice.
Note: 1.00 means the number one with two decimal places.
AKL V3.9 06.05.10
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.
0.750A/24V
0.750A
0.750A/33V
1.10A/16V
1.10A/33V
1.10A
1.25A
1.25A/6V
1.50A/12V
1.50A-/8V
1.50A/24V
1.60A/12V
1.60A
1.60A/8
2.00A
2.60A
0.100A
0.140A
0.200A
0.500A
1812L Series
Specifications are subject to change without notice.
Electronics Designers Guide
www.littelfuse.com
©2006 Littelfuse
POLYFUSE
®
Resettable PTCs
Surface Mount
Soldering Parameters
Condition
Peak Temp/ Duration Time
Time above liquids (TAL) 220°C
Preheat 120°C~ 180°C
Storage Condition
Reflow
260°C / 10 Sec
60 Sec ~ 100 Sec
Temperature (°C)
260
220
Soldering
Cooling
50 Sec ~ 150 Sec
0°C~35°C, < 70%RH
=
• Recommended reflow methods: IR, vapor phase oven, hot air
oven, N
2
environment for lead-free
• Devices are not designed to be wave soldered to the bottom side
of the board.
• Recommended maximum paste thickness is 0.25mm (0.010 inch)
• Devices can be cleaned using standard industry methods and
solvents.
Note:
If reflow temperatures exceed the recommended profile,
devices may not meet the performance requirements.
180
120
Preheating
0
50 to 150
60 to 100
Time(s)
120
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
Temperature
Maximum Device Surface
Temperature in Tripped State
Passive Aging
Humidity Aging
-40°C to +85°C
125°C
+85°C, 1000 hours
±5% typical resistance change
+85°C, 85%R.H. 1000 hours
±5% typical resistance change
MIL-STD-202 Method 107G
+85°C/-40°C 20 times
-30% typical resistance change
MIL-STD-202, Method 215
No change
MIL-STD-883C, Method 2007.1,
Condition A
No change
Thermal Shock
Solvent Resistance
Vibration
1812L Series
Specifications are subject to change without notice.
Electronics Designers Guide
www.littelfuse.com
©2006 Littelfuse
POLYFUSE
®
Resettable PTCs
Surface Mount
Dimensions
MARKING CODE VARIES
WITH AMPERAGE AND VOLTAGE RATING
(SEE CHART)
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”)
A
Part Number
1812L010
1812L014
1812L020
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
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
0.19
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
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
4.73
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
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
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
0.13
B
mm
3.07
3.07
3.07
3.07
3.07
3.07
3.07
3.07
3.07
3.07
3.07
3.07
3.07
3.07
3.07
3.07
3.07
3.07
3.07
3.41
3.41
3.41
3.41
3.41
3.41
3.41
3.41
3.41
3.41
3.41
3.41
3.41
3.41
3.41
3.41
3.41
3.41
3.41
Inches
0.03
0.03
0.02
0.02
0.02
0.03
0.03
0.02
0.03
0.05
0.03
0.02
0.02
0.03
0.03
0.02
0.03
0.03
0.03
0.05
0.08
0.04
0.03
0.03
0.06
0.06
0.03
0.05
0.08
0.05
0.03
0.03
0.05
0.07
0.03
0.05
0.05
0.05
C
mm
0.75
0.75
0.55
0.5
0.5
0.75
0.75
0.5
0.75
1.2
0.75
0.45
0.4
0.75
0.8
0.4
0.75
0.81
0.8
1.25
1.95
1
0.75
0.75
1.55
1.55
0.71
1.25
2
1.25
0.75
0.71
1.25
1.8
0.75
1.25
1.2
1.34
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
D
Inches
mm
Min.
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
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
0.03
0.03
0.03
0.02
0.02
0.03
0.03
0.02
0.03
0.03
0.02
0.03
0.03
0.03
0.03
0.03
0.03
0.02
0.02
E
mm
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.65
0.65
0.65
0.5
0.5
0.65
0.65
0.5
0.65
0.65
0.5
0.65
0.65
0.65
0.65
0.65
0.65
0.5
0.5
Min Max. Min. Max.
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max.
1812L Series
Specifications are subject to change without notice.
Electronics Designers Guide
www.littelfuse.com
©2006 Littelfuse
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