SMD1812 HF Series Surface Mount PTC Devices
Description
The 1812 series provides surface mount resettable overcurrent protection with
holding current from 0.1A to 3.0A. This series offers complete portfolio in terms of holding
current and working voltage, and is suitable for wide range of applications.
Features
RoHS compliant and lead-free
Halogen-free
Compact design saves board space
Low profile
Fast response to fault current
Compatible with high temperature solders
Applications
USB hubs, ports and peripherals
Set-top-box and HDMI
Game console port protection
Motherboard USB & IEEE 1394 protection
Optical disk drives
General electronics
Agency Approval and Environmental Compliance
Agency
File Number
E201431
Regulation
Standard
2002/95/EC
IEC 61249-2-21:2003
R50099121
Electrical Characteristics
Part Number
SMD1812P010TF
SMD1812P014TF
SMD1812P020TF
SMD1812P035TF/30
SMD1812P050TF
SMD1812P050TF/30
SMD1812P075TF
SMD1812P075TF/24
SMD1812P075TF/33
SMD1812P110TF
SMD1812P110TF/16
SMD1812P110TF/24
SMD1812P110TF/33
SMD1812P125TF/16
SMD1812P125TF/6,4L
SMD1812P150TF/8
SMD1812P150TF/12
SMD1812P150TF/24
SMD1812P160TF/8(4L)
SMD1812P200TFT
SMD1812P260TFT
SMD1812P260TF/12
SMD1812P300TFT
I
hold
(A)
0.10
0.14
0.20
0.35
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
1.60
2.00
2.60
2.60
3.00
I
trip
(A)
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
3.00
3.00
3.00
2.80
3.50
5.00
5.00
5.00
V
max
(Vdc)
30
60
30
30
15
30
13.2
24
33
8
16
24
33
16
6
8
12
24
8
8
8
12
6
I
max
(A)
100
10
100
40
100
100
100
100
20
100
100
20
20
100
100
100
100
20
100
100
100
100
100
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
Maximum
Time To Trip
Current Time
(A)
(Sec.)
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
8.00
8.00
8.00
8.00
1.50
0.15
0.02
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
1.50
1.00
2.00
2.50
5.00
4.00
Resistance
R
min
(Ω)
1.600
1.500
0.800
0.400
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
0.030
0.020
0.015
0.015
0.012
Agency
Approval
R
1max
(Ω)
15.000
6.000
5.000
1.700
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
0.120
0.100
0.070
0.047
0.055
0.040
新竹市科學工業園區工業東四路
24-1
號
No. 24-1 Industry E. Rd. IV, Hsinchu Science Park, Hsinchu 300, Taiwan.
TEL: +886-3-5643931 FAX: +886-3-5644624
http://www.pttc.com.tw
Page: 2 of 11
2010/05/21 Revision: J
SMD1812 HF Series Surface Mount PTC Devices
Note on Electrical Characteristics
Vocabulary
I
hold
I
trip
V
max
I
max
P
d typ
R
min
= Hold current: maximum current device will pass without tripping in 23ºC still air.
= Trip current: minimum current at which the device will trip in 23 ºC still air.
= Maximum voltage device can withstand without damage at rated current (I
max
)
= Maximum fault current device can withstand without damage at rated voltage (V
max
)
= Typical power dissipated from device when in the tripped state at 23 ºC still air.
= Minimum resistance of device in initial (un-soldered) state.
R
1max
= Maximum resistance of device at 23 ºC measured one hour after tripping or reflow soldering of 260 ºC for 20 sec.
Value specified is determined by using the PWB with 0.030”*1.5oz copper traces.
Caution: Operation beyond the specified rating may result in damage and possible arcing and flame.
Specifications are subject to change without notice.
Polymeric PTC Selecting Guide
Determine the following operating parameters for the circuits:
Normal operating current (I
hold
)
Maximum circuit voltage (V
max
)
Maximum interrupt current (I
max
)
Normal operating temperature surrounding device (minºC/maxºC)
Select the device form factor and dimension suitable for the application:
Surface Mount Device (SMD)
Radial Leaded Device (RLD)
Axial Leaded Device (ALD)
DISC Device
Other Customized Form Factors
Compare the maximum rating for V
max
and I
max
of the PPTC device with the circuit in application and make
sure the circuit’s requirement does not exceed the device rating.
Check that PPTC device’s trip time (time-to-trip) will protect the circuit.
Verify that the circuit operating temperature is within the PPTC device’s normal operating temperature range.
Verify the performance and suitability of the chosen PPTC device in the application.
新竹市科學工業園區工業東四路
24-1
號
No. 24-1 Industry E. Rd. IV, Hsinchu Science Park, Hsinchu 300, Taiwan.
TEL: +886-3-5643931 FAX: +886-3-5644624
http://www.pttc.com.tw
Page: 3 of 11
2010/05/21 Revision: J
SMD1812 HF Series Surface Mount PTC Devices
Thermal Derating Curve
200.00
Percentage of Rated Current
150.00
100.00
50.00
0.00
-40.00
0.00
40.00
80.00
120.00
Device's Ambient Temperature (
℃
)
Thermal Derating Chart
Recommended Hold Current (A) at Ambient Temperature (ºC)
Part Number
SMD1812P010TF
SMD1812P014TF
SMD1812P020TF
SMD1812P035TF/30
SMD1812P050TF
SMD1812P050TF/30
SMD1812P075TF
SMD1812P075TF/24
SMD1812P075TF/33
SMD1812P110TF
SMD1812P110TF/16
SMD1812P110TF/24
SMD1812P110TF/33
SMD1812P125TF/16
SMD1812P125TF/6,4L
SMD1812P150TF/8
SMD1812P150TF/12
SMD1812P150TF/24
SMD1812P160TF/8(4L)
SMD1812P200TFT
SMD1812P260TFT
SMD1812P260TF/12
SMD1812P300TFT
Ambient Operation Temperature
-40 ºC
0.16
0.23
0.29
0.50
0.77
0.77
1.15
1.06
1.10
1.59
1.58
1.55
1.55
2.00
2.00
2.06
2.04
2.05
2.20
2.60
3.40
3.40
4.13
-20 ºC
0.14
0.19
0.26
0.45
0.68
0.68
1.01
0.95
1.00
1.43
1.43
1.40
1.40
1.75
1.75
1.93
1.88
1.87
2.06
2.44
3.16
3.16
3.75
0 ºC
0.12
0.17
0.23
0.40
0.59
0.59
0.88
0.84
0.88
1.26
1.27
1.25
1.25
1.52
1.52
1.79
1.68
1.67
1.91
2.22
3.00
3.00
3.30
23 ºC
0.10
0.14
0.20
0.35
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
1.60
2.00
2.60
2.60
3.00
40 ºC
0.08
0.12
0.17
0.30
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
1.36
1.78
2.30
2.30
2.62
50 ºC
0.07
0.10
0.15
0.26
0.40
0.40
0.60
0.55
0.60
0.87
0.85
0.83
0.83
0.95
0.95
1.10
1.10
1.08
1.17
1.67
2.15
2.15
2.43
60 ºC
0.06
0.09
0.14
0.24
0.37
0.37
0.55
0.50
0.56
0.80
0.77
0.73
0.73
0.90
0.90
1.02
1.00
0.95
1.09
1.50
2.00
2.00
2.25
70 ºC
0.05
0.08
0.12
0.20
0.33
0.33
0.49
0.45
0.47
0.71
0.71
0.63
0.63
0.75
0.75
0.80
0.80
0.77
0.85
1.45
1.85
1.85
2.00
85 ºC
0.03
0.06
0.10
0.16
0.29
0.29
0.43
0.37
0.36
0.60
0.58
0.50
0.50
0.53
0.53
0.68
0.60
0.60
0.72
1.29
1.63
1.63
1.78
新竹市科學工業園區工業東四路
24-1
號
No. 24-1 Industry E. Rd. IV, Hsinchu Science Park, Hsinchu 300, Taiwan.
TEL: +886-3-5643931 FAX: +886-3-5644624
http://www.pttc.com.tw
Page: 4 of 11
2010/05/21 Revision: J
SMD1812 HF Series Surface Mount PTC Devices
Average Time-Current Curve
100.00
AB C D
E
FG
A
－SMD1812P110TF
B
－SMD1812P125TF/6,4L
C
－SMD1812P150TF/8
D
－SMD1812P160TF/8(4L)
E
－SMD1812P200TFT
F
－SMD1812P260TFT
SMD1812P260TF/12
10.00
Time to Trip (Sec.)
1.00
G
－SMD1812P300TFT
0.10
0.01
1.00
10.00
100.00
Fault Current (Amp.)
Average Time-Current Curve
100.00
AB
CD E
A
－SMD1812P050TF
B
－SMD1812P075TF
C
－SMD1812P110TF/16
D
－SMD1812P125TF/16
E
－SMD1812P150TF/12
10.00
Time to Trip (Sec.)
1.00
0.10
0.01
0.10
1.00
10.00
100.00
Fault Current (Amp.)
新竹市科學工業園區工業東四路
24-1
號
No. 24-1 Industry E. Rd. IV, Hsinchu Science Park, Hsinchu 300, Taiwan.
TEL: +886-3-5643931 FAX: +886-3-5644624
http://www.pttc.com.tw
Page: 5 of 11
2010/05/21 Revision: J
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