TM
Revision: G
SMD1812 Surface Mount PTC Devices
R.O.C. Patent#415624
The SMD1812 Series, a polymer-based Positive Temperature Coefficient (PTC) device to
protect electrical circuits against overcurrent conditions with resettable feature, is fully
compatible with current industrial standards.
The new designed SMD1812 Series provides surface mount overcurrent protection with
superior performance.
Application: The small sized SMD1812 Series is ideal for computers and peripherals and can
be applied to almost anywhere there is a low voltage power supply and a load to be protected.
The gold or solder plated termination is designed to meet or exceed solderability specifications
and provide excellent solder joint inspectability.
Agency Approval: UL/CSA File No. E201431.
TÜV Certificate # R9956421
ELECTRICAL CHARACTERISTICS
Part Number
SMD1812P010TS
SMD1812P014TS
SMD1812P020TS
SMD1812P050TS
SMD1812P075TS
SMD1812P075TS/24
SMD1812P075TS/33
SMD1812P110TS
SMD1812P110TS/16
SMD1812P110TS/33
SMD1812P125TS
SMD1812P150TS
SMD1812P150TS/24
SMD1812P160TS
SMD1812P160TS/12
SMD1812P200TS
SMD1812P260TS
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
1.50
1.50
1.60
1.60
2.00
2.60
I
trip
V
max
(A) (Vdc)
0.30 30
0.34 60
0.40 30
1.00 15
1.50 13.2
1.50 24
1.50 33
2.20 6
1.95 16
1.95 33
2.50 15
3.00 6
3.00 24
2.80 6
2.80 12
3.50 8
5.20 6
I
max
P
d
Current Time
(A) (W)
(A)
(Sec.)
1.50
0.50
10 0.8
0.15
1.50
10 0.8
0.02
8.00
10 0.8
0.15
8.00
40 0.8
0.20
8.00
40 0.8
0.20
8.00
40 0.8
0.20
8.00
20 0.8
0.30
8.00
40 0.8
0.50
8.00
40 0.8
0.50
8.00
20 0.8
0.40
8.00
40 0.8
0.50
8.00
40 0.8
1.50
8.00
20 0.8
1.00
8.00
40 0.8
1.00
8.00
20 0.8
2.00
8.00
40 0.8
2.50
8.00
40 0.8
max.
Maximum
Time To Trip
Resistance
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
0.040
0.040
0.030
0.030
0.020
0.015
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
0.070
0.070
0.066
0.066
0.040
0.030
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
0.110
0.120
0.100
0.100
0.060
0.047
Agency
Approval
UL/CSA/TÜV
UL/CSA/TÜV
UL/CSA/TÜV
UL/CSA/TÜV
UL/CSA/TÜV
UL/CSA/TÜV
UL/CSA
UL/CSA/TÜV
UL/CSA/TÜV
UL/CSA
UL/CSA/TÜV
UL/CSA/TÜV
UL/CSA
UL/CSA/TÜV
UL/CSA/TÜV
UL/CSA/TÜV
UL/CSA/TÜV
07/12/2004
聚鼎科技股½有限公司
Polytronics Technology Corp.
新竹市科學工業園區展業㆒路 9 號 6 樓之 3
6F-3, No.9 Prosperity Rd. I, SBIP, Hsin-Chu, Taiwan TEL:886-3-5643931 FAX:886-3-5644624
E-mail:pttc6368@ms22.hinet.net Http://www.pttc.com.tw
Page: 1 of 10
TM
Revision: G
SMD1812 Surface Mount PTC Devices
R.O.C. Patent#415624
Note:
I
hold
= Hold current: maximum current device will pass without tripping in 20℃
All products may be followed by suffix TG or TF
Caution: Operation beyond the specified rating may result in damage and possible arcing and flame.
Recognitions: UL, CSA,
TÜV
recognized.
◎
still air.
I
trip
= Trip current: minimum current at which the device will trip in 20℃ 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℃ 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℃ measured one hour after tripping or reflow soldering of 260℃ for 20 sec.
Specifications are subject to change without notice.
07/12/2004
聚鼎科技股½有限公司
Polytronics Technology Corp.
新竹市科學工業園區展業㆒路 9 號 6 樓之 3
6F-3, No.9 Prosperity Rd. I, SBIP, Hsin-Chu, Taiwan TEL:886-3-5643931 FAX:886-3-5644624
E-mail:pttc6368@ms22.hinet.net Http://www.pttc.com.tw
Page: 2 of 10
TM
Revision: G
SMD1812 Surface Mount PTC Devices
R.O.C. Patent#415624
How to Select a Polymer PTC fuse:
(1) Determine the following operating parameters for the circuits:
(A) Normal Operating Current (I hold)
(B) Maximum Circuit Voltage (V max)
(C) Maximum Interrupt Current (I max)
(D) Normal Operating Temperature (min℃/max℃)
(2) Select the device form factor and dimension suitable for the application:
Surface Mount Device (SMD Series)
Radial Leaded Device (RLD Series)
Axial Leaded Strap Device (STD Series)
Other Custom-designed Device (Disc/Chip)
(3) Compare the maximum ratings for V max and I max of the PTC device with
the circuit in application and make sure that the circuit’s requirement does
not exceed the device ratings.
(4) Check that the PTC device’s trip time (time-to-trip) will protect the circuit.
(5) Verify that the circuit operating temperatures are within the PTC device’s
normal operating temperature range.
(6) Verify the performance and suitability of the chosen PTC device in the
application.
07/12/2004
聚鼎科技股½有限公司
Polytronics Technology Corp.
新竹市科學工業園區展業㆒路 9 號 6 樓之 3
6F-3, No.9 Prosperity Rd. I, SBIP, Hsin-Chu, Taiwan TEL:886-3-5643931 FAX:886-3-5644624
E-mail:pttc6368@ms22.hinet.net Http://www.pttc.com.tw
Page: 3 of 10
TM
Revision: G
SMD1812 Surface Mount PTC Devices
THERMAL DERATING CURVE FOR SMD1812 SERIES
200.00
R.O.C. Patent#415624
P
ercentage of R
ated C
urrent
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 FOR SMD1812 SERIES – Ihold(Amps)
Model
SMD1812P010TS
SMD1812P014TS
SMD1812P020TS
SMD1812P050TS
SMD1812P075TS
SMD1812P075TS/24
SMD1812P075TS/33
SMD1812P110TS
SMD1812P110TS/16
SMD1812P110TS/33
SMD1812P125TS
SMD1812P150TS
SMD1812P150TS/24
SMD1812P160TS
SMD1812P160TS/12
SMD1812P200TS
SMD1812P260TS
-40℃ -20℃
0.16
0.23
0.29
0.77
1.15
1.06
TBD
1.59
1.58
TBD
2.00
2.30
TBD
2.27
TBD
3.08
4.00
0.14
0.19
0.26
0.68
1.01
0.95
TBD
1.43
1.43
TBD
1.75
2.03
TBD
2.05
TBD
2.71
3.52
Ambient Operation Temperature
0℃ 23℃ 40℃ 50℃ 60℃
0.12
0.17
0.23
0.59
0.88
0.84
TBD
1.26
1.27
TBD
1.52
1.76
TBD
1.83
TBD
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
1.50
1.50
1.60
1.60
2.00
2.60
0.08
0.12
0.17
0.44
0.65
0.60
TBD
0.95
0.95
TBD
1.00
1.25
TBD
1.35
TBD
1.80
2.34
0.07
0.10
0.15
0.40
0.60
0.55
TBD
0.87
0.85
TBD
0.95
1.10
TBD
1.25
TBD
1.60
2.08
0.06
0.09
0.14
0.37
0.55
0.50
TBD
0.80
0.77
TBD
0.90
1.00
TBD
1.15
TBD
1.50
1.95
70℃
0.05
0.08
0.12
0.33
0.49
0.45
TBD
0.71
0.71
TBD
0.75
0.80
TBD
1.00
TBD
1.07
1.39
85℃
0.03
0.06
0.10
0.29
0.43
0.37
TBD
0.60
0.58
TBD
0.53
0.06
TBD
0.85
TBD
0.80
1.04
07/12/2004
All products may be followed by suffix TG or TF
聚鼎科技股½有限公司
Polytronics Technology Corp.
新竹市科學工業園區展業㆒路 9 號 6 樓之 3
6F-3, No.9 Prosperity Rd. I, SBIP, Hsin-Chu, Taiwan TEL:886-3-5643931 FAX:886-3-5644624
E-mail:pttc6368@ms22.hinet.net Http://www.pttc.com.tw
Page: 4 of 10
TM
Revision: G
SMD1812 Surface Mount PTC Devices
100.000
B
C
D EG F
R.O.C. Patent#415624
AVERAGE TIME-CURRENT CURVE FOR SMD1812 SERIES
A
10.000
T etoT (S c
im
rip e .)
1.000
0.100
0.010
0.001
0.10
1.00
10.00
100.00
A:SMD1812P010TS
B:SMD1812P014TS
C:SMD1812P020TS
D:SMD1812P050TS
E:SMD1812P075TS
F:SMD1812P075TS/24
G:SMD1812P075TS/33
Fault Current (Amp.)
All products may be followed by suffix TG or TF
AVERAGE TIME-CURRENT CURVE FOR SMD1812 SERIES
100.000
B
A D CF E G H
I
J
10.000
T etoT (S c
im
rip e .)
1.000
0.100
0.010
1.00
10.00
A:SMD1812P125TS
B:SMD1812P110TS
C:SMD1812P110TS/16
D:SMD1812P110TS/33
E:SMD1812P150TS
F:SMD1812P150TS/24
G:SMD1812P160TS
H:SMD1812P160TS/12
I:SMD1812P200TS
J:SMD1812P260TS
100.00
Fault Current (Amp.)
All products may be followed by suffix TG or TF
07/12/2004
聚鼎科技股½有限公司
Polytronics Technology Corp.
新竹市科學工業園區展業㆒路 9 號 6 樓之 3
6F-3, No.9 Prosperity Rd. I, SBIP, Hsin-Chu, Taiwan TEL:886-3-5643931 FAX:886-3-5644624
E-mail:pttc6368@ms22.hinet.net Http://www.pttc.com.tw
Page: 5 of 10
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