Positive Thermal Coefficent (PTC)
Description
The 1812 series provides miniature surface mount
resettable over-current protection with holding current
from 0.1A to 4.0A. This series is suitable for ultra portable
applications where space is at a premium and the device
current is low.
SMD1812 Series
Features
l
I(hold): 0.1~4.0A
l
Very high voltage surge capabilities
l
Available in lead-free version
l
Fast response to fault current
l
RoHS compliant, Lead- Free and Halogen-Free
l
Low resistance
l
Compact design saves board space
l
Compatible with high temperature solders
Applications
l
USB peripherals
l
Disk drives
l
CD-ROMs
l
General electronics
l
Disk drives
l
Set-top-box and HDMI
l
Mobile Internet Device
(MID)
l
PDAs / digital cameras
l
Game console port
protection
l
Plug and play protection
for motherboards and
peripherals
l
Mobile phones - battery
and port protection
Part Number Code
S
M
D
1
8
1
2
P
X
X
X
T
F
/
-
-
Surface Mount
Device
Device size
code
Polytronics
Symbol
Current Rating
T: Thin Version
(Optional)
F: Lead-free
Special Voltage
Rating (Optional)
Environmental Specifications
Test
Passive aging
Humidity aging
Thermal shock
Resistance to solvent
Vibration
Ambient operating conditions : - 40
°C
to +85
°C
Maximum surface temperature of the device in the tripped state is 125
°C
Conditions
+85℃,1000 hrs
+85℃，85%R.H.,168 hours
+85℃ to -40℃，20times
MIL-STD-202，Method 215
MIL-STD-202，Method 201
Resistance change
±5%
typical
±5%
typical
±33%
typical
No change
No change
Specifications are subject to change without notice.
Please refer to http://
www.ruilon.com.cn
for current information.
Revised: 2018-08-13
Page:1
Positive Thermal Coefficent (PTC)
Performance Specification
I
hold
Type Number
A
SMD1812P010TF
SMD1812P010TF/60
SMD1812P014TF
SMD1812P020TF
SMD1812P020TF/60
SMD1812P030TF
SMD1812P030TF/60
SMD1812P050TF
SMD1812P050TF/30
SMD1812P050TF/60
SMD1812P075TF
SMD1812P075TF/16
SMD1812P075TF/24
SMD1812P075TF/33
SMD1812P110TF
SMD1812P110TF/16
SMD1812P110TF/24
SMD1812P110TF/33
SMD1812P125TF
SMD1812P150TF
SMD1812P150TF/16
SMD1812P150TF/24
SMD1812P150TF/33
SMD1812P160TF
SMD1812P200TF
SMD1812P200TF/16
SMD1812P200TF/24
SMD1812P260TF
SMD1812P260TF/16
SMD1812P260TF/24
SMD1812P300TF
SMD1812P300TF/16
SMD1812P350TF
SMD1812P350TF/16
SMD1812P400TF
0.1
0.1
0.14
0.2
0.2
0.3
0.3
0.5
0.5
0.5
0.75
0.75
0.75
0.75
1.1
1.1
1.1
1.1
1.25
1.5
1.5
1.5
1.5
1.6
2
2
2
2.6
2.6
2.6
3
3
3.5
3.5
4
A
0.3
0.3
0.34
0.4
0.4
0.6
0.6
1.0
1.0
1.0
1.5
1.5
1.5
1.5
2.2
2.2
2.2
2.2
2.5
3
3
3
3
2.8
4
4
4
5
5
5
5
5
6
6
7
V
DC
30
60
60
30
60
30
60
15
30
60
13.2
16
24
33
8
16
24
33
16
8
16
24
33
8
8
16
24
8
16
24
8
16
6
16
6
I
trip
V
max
Max.
Time to Trip
Current
T
max
A
S
0.5
1.5
0.5
1.5
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
10
10
10
1.5
0.15
0.02
0.02
0.1
0.1
0.15
0.15
0.15
0.2
0.2
0.2
0.2
0.3
0.3
0.3
0.3
0.4
0.5
0.5
0.5
0.5
1
2
2
2
2.5
2.5
2.5
4
4
4
4
4
I
max
A
30
30
30
30
30
30
30
30
30
30
30
30
30
30
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
P
d 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
0.8
0.8
0.8
0.8
0.8
0.8
0.8
2
2
2
SMD1812 Series
Ri
min
Ω
0.75
0.75
0.65
0.35
0.35
0.25
0.25
0.15
0.15
0.15
0.09
0.09
0.09
0.09
0.045
0.05
0.05
0.05
0.05
0.04
0.04
0.04
0.04
0.03
0.02
0.02
0.02
0.01
0.01
0.01
0.01
0.01
0.008
0.008
0.005
R1
max
Package
Ω
15
15
6
5
5
3
3
1.0
1.0
1.4
0.45
0.45
0.45
0.45
0.25
0.25
0.25
0.25
0.14
0.16
0.16
0.16
0.16
0.13
0.1
0.1
0.1
0.05
0.05
0.05
0.04
0.04
0.03
0.03
0.025
1812
1812
1812
1812
1812
1812
1812
1812
1812
1812
1812
1812
1812
1812
1812
1812
1812
1812
1812
1812
1812
1812
1812
1812
1812
1812
1812
1812
1812
1812
1812
1812
1812
1812
1812
V
max
= Maximum operating 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
).
I
hold
= Hold Current. Maximum current device will not trip in 25°C still air.
I
trip
= Trip Current. Minimum current at which the device will always trip in 25°C still air.
P
d
= Power dissipation when device is in the tripped state in 25°C still air environment at rated voltage.
Ri
min/max
= Minimum/Maximum device resistance prior to tripping at 25°C.
R1
max
= Maximum device resistance is measured one hour post reflow.
Specifications are subject to change without notice.
Please refer to http://
www.ruilon.com.cn
for current information.
Revised: 2018-08-13
Page:2
Positive Thermal Coefficent (PTC)
Thermal Derating Chart-Ih(A)
Ambient Operation Temperature
Part Number
SMD1812P010TF
SMD1812P010TF/60
SMD1812P014TF
SMD1812P020TF
SMD1812P020TF/60
SMD1812P030TF
SMD1812P030TF/60
SMD1812P050TF
SMD1812P050TF/30
SMD1812P050TF/60
SMD1812P075TF
SMD1812P075TF/16
SMD1812P075TF/24
SMD1812P075TF/33
SMD1812P110TF
SMD1812P110TF/16
SMD1812P110TF/24
SMD1812P110TF/33
SMD1812P125TF
SMD1812P150TF
SMD1812P150TF/16
SMD1812P150TF/24
SMD1812P150TF/33
SMD1812P160TF
SMD1812P200TF
SMD1812P200TF/16
SMD1812P200TF/24
SMD1812P260TF
SMD1812P260TF/16
SMD1812P260TF/24
SMD1812P300TF
SMD1812P300TF/16
SMD1812P350TF
SMD1812P350TF/16
SMD1812P400TF
-40
ºC
0.16
0.16
0.23
0.29
0.29
0.44
0.44
0.59
0.59
0.59
1.10
1.10
1.10
1.10
1.60
1.60
1.60
1.60
2.00
2.10
2.10
2.10
2.10
2.30
2.88
2.88
2.88
3.90
3.90
3.90
4.15
4.15
4.84
4.84
5.80
-20
ºC
0.14
0.14
0.19
0.26
0.26
0.39
0.39
0.57
0.57
0.57
0.99
0.99
0.99
0.99
1.45
1.45
1.45
1.45
1.75
1.96
1.96
1.96
1.96
2.05
2.61
2.61
2.61
3.42
3.42
3.42
3.76
3.76
4.39
4.39
5.20
0
ºC
0.12
0.12
0.17
0.23
0.23
0.35
0.35
0.55
0.55
0.55
0.87
0.87
0.87
0.87
1.28
1.28
1.28
1.28
1.52
1.77
1.77
1.77
1.77
1.88
2.25
2.25
2.25
2.96
2.96
2.96
3.46
3.46
4.04
4.04
4.60
25
ºC
0.10
0.10
0.14
0.20
0.20
0.30
0.30
0.50
0.50
0.50
0.75
0.75
0.75
0.75
1.10
1.10
1.10
1.10
1.25
1.50
1.50
1.50
1.50
1.60
2.00
2.00
2.00
2.60
2.60
2.60
3.00
3.00
3.50
3.50
4.00
40
ºC
0.08
0.08
0.12
0.17
0.17
0.26
0.26
0.45
0.45
0.45
0.63
0.63
0.63
0.63
0.92
0.92
0.92
0.92
1.00
1.23
1.23
1.23
1.23
1.26
1.80
1.80
1.80
2.33
2.33
2.33
2.55
2.55
2.98
2.98
3.35
50
ºC
0.07
0.07
0.10
0.15
0.15
0.23
0.23
0.43
0.43
0.43
0.57
0.57
0.57
0.57
0.83
0.83
0.83
0.83
0.95
1.09
1.09
1.09
1.09
1.12
1.66
1.66
1.66
2.07
2.07
2.07
2.28
2.28
2.66
2.66
3.12
60
ºC
0.06
0.06
0.09
0.14
0.14
0.21
0.21
0.35
0.35
0.35
0.49
0.49
0.49
0.49
0.71
0.71
0.71
0.71
0.90
0.95
0.95
0.95
0.95
0.98
1.45
1.45
1.45
1.94
1.94
1.94
2.01
2.01
2.35
2.35
2.75
SMD1812 Series
70
ºC
0.05
0.05
0.08
0.12
0.12
0.18
0.18
0.30
0.30
0.30
0.45
0.45
0.45
0.45
0.66
0.66
0.66
0.66
0.75
0.82
0.82
0.82
0.82
0.84
1.09
1.09
1.09
1.35
1.35
1.35
1.61
1.61
1.88
1.88
2.45
85
ºC
0.03
0.03
0.06
0.10
0.10
0.15
0.15
0.23
0.23
0.23
0.35
0.35
0.35
0.35
0.52
0.52
0.52
0.52
0.53
0.61
0.61
0.61
0.61
0.63
0.80
0.80
0.80
1.00
1.00
1.00
1.33
1.33
1.55
1.55
2.10
Specifications are subject to change without notice.
Please refer to http://
www.ruilon.com.cn
for current information.
Revised: 2018-08-13
Page:3
Positive Thermal Coefficent (PTC)
Thermal Derating Curve
Derating Curves for SMD1812 Series
Percentage of Derated Current
160
140
120
100
80
60
40
20
0
-40
-20
0
20
40
60
80
Temperature (°C)
0.01
0.1
1
Time In Seconds
10
100
SMD1812 Series
Average Time-Current Curve
Average Time Current Curves
0.10A
0.14A
0.20A
0.30A
0.50A
0.75A
1.10A
1.25A
1.50A
1.60A
2.00A
2.60A
3.00A
3.50A
4.00A
1
0.1
10
Current in Amperes
Soldering Parameters
Reflow Condition
T
P
Ramp-up
Critical Zone
T
L
to T
P
Pb - Free assembly
150°C
200°C
60 -180 Seconds
3°C/second max
3°C/second max
217°C
60 -150 Seconds
260 +0/-5°C
20 - 40 Seconds
6°C/second max
8 minutes Max
260°C
-Temperature Min (T
s(min)
)
Pre
Heat
-Temperature Max (T
s(max)
)
- Time (min to max) (t
s
)
Ramp-down
T
L
T
S(max)
Temperature
Average ramp up rate ( Liquids Temp
T
L
) to peak
T
S(max)
to TL - Ramp-up Rate
T
S(min)
Preheat
25
Time to peak temperature
(t 25℃ to peak)
Reflo
w
Time
- Temperature (T
L
) (Liquids)
- Time (min to max) (t
s
)
Peak Temperature (T
P
)
Time within 5°C of actual peak
Temperature (t
p
)
Ramp-down Rate
Time 25°C to peak Temperature (T
P
)
Do not exceed
Lead style code
Recommended Pad Layout (mm.)
Specifications are subject to change without notice.
Please refer to http://
www.ruilon.com.cn
for current information.
Revised: 2018-08-13
Page:4
Positive Thermal Coefficent (PTC)
Dimensions
Package Dimensions (mm)
Type Number
min
SMD1812P010TF
SMD1812P010TF/60
SMD1812P014TF
SMD1812P020TF
SMD1812P020TF/60
SMD1812P030TF
SMD1812P030TF/60
SMD1812P050TF
SMD1812P050TF/30
SMD1812P050TF/60
SMD1812P075TF
SMD1812P075TF/16
SMD1812P075TF/24
SMD1812P075TF/33
SMD1812P110TF
SMD1812P110TF/16
SMD1812P110TF/24
SMD1812P110TF/33
SMD1812P125TF
SMD1812P150TF
SMD1812P150TF/16
SMD1812P150TF/24
SMD1812P150TF/33
SMD1812P160TF
SMD1812P200TF
SMD1812P200TF/16
SMD1812P200TF/24
SMD1812P260TF
SMD1812P260TF/16
SMD1812P260TF/24
SMD1812P300TF
SMD1812P300TF/16
SMD1812P350TF
SMD1812P350TF/16
SMD1812P400TF
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
4.37
4.37
4.37
4.37
4.37
A
max
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
4.73
4.73
4.73
4.73
4.73
min
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
3.07
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
B
max
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
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
min
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.40
0.40
0.50
0.50
0.50
0.60
0.60
0.40
0.40
0.60
0.60
0.40
0.50
0.50
0.50
0.80
0.50
0.50
0.50
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
C
max
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.00
1.00
1.10
1.10
1.10
1.30
1.30
1.00
1.00
1.30
1.30
1.00
1.10
1.10
1.10
1.50
1.10
1.10
1.10
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
1.50
D
min
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
0.3
0.3
0.3
min
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
0.172
A
max
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
0.186
min
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
0.121
SMD1812 Series
Package Dimensions (in)
B
max
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
0.134
min
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.016
0.016
0.02
0.02
0.02
0.024
0.024
0.016
0.016
0.024
0.024
0.016
0.02
0.02
0.02
0.031
0.02
0.02
0.02
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
0.031
C
max
0.043
0.043
0.043
0.043
0.043
0.043
0.043
0.039
0.039
0.043
0.043
0.043
0.051
0.051
0.039
0.039
0.051
0.051
0.039
0.043
0.043
0.043
0.059
0.043
0.043
0.043
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
0.059
D
min
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
Specifications are subject to change without notice.
Please refer to http://
www.ruilon.com.cn
for current information.
Revised: 2018-08-13
Page:5
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