BHFUSE
BSMD1812 Series Surface Mount PTC Device
Features
Size 0.18*0.12 inch /4.5*3.2 mm
RoHS compliant, lead-free and halogen-free
Fast response to fault current
Low resistance
Low profile
Compatible with high temperature solders
Applications
Computer, Mobile phones, Multimedia
Automotive, Industrial controls, Telephony and broadband
Game machines, Portable electronics, Battery
Electrical Characteristics（25℃）
Part Number
BSMD1812-010-30V
BSMD1812-010-60V
BSMD1812-014-60V
BSMD1812-020-30V
BSMD1812-020-60V
BSMD1812-030-30V
BSMD1812-030-60V
BSMD1812-050-15V
BSMD1812-050-24V
BSMD1812-050-30V
BSMD1812-050-60V
BSMD1812-075-13.2V
BSMD1812-075-16V
BSMD1812-075-24V
BSMD1812-075-33V
BSMD1812-110-8V
BSMD1812-110-16V
BSMD1812-110-24V
BSMD1812-110-33V
BSMD1812-125-16V
BSMD1812-125-24V
BSMD1812-150-16V
I
hold
(A)
0.10
0.10
0.14
0.20
0.20
0.30
0.30
0.50
0.50
0.50
0.50
0.75
0.75
0.75
0.75
1.10
1.10
1.10
1.10
1.25
1.25
1.50
I
trip
(A)
0.30
0.30
0.34
0.40
0.40
0.60
0.60
1.00
1.00
1.00
1.00
1.50
1.50
1.50
1.50
2.20
2.20
2.20
2.20
2.50
2.50
3.00
V
max
(V
dc
)
30
60
60
30
60
30
60
15
24
30
60
13.2
16
24
33
8
16
24
33
16
24
16
I
max
(A)
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
100
100
40
40
100
40
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
Time to trip
(A)
(Sec)
0.50
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
1.50
1.50
0.15
0.04
0.04
0.10
0.10
0.15
0.15
0.15
0.15
0.20
0.20
0.20
0.20
0.30
0.30
0.30
0.30
0.40
0.40
0.50
R
min
(Ω)
0.750
0.750
0.650
0.350
0.350
0.250
0.250
0.150
0.150
0.150
0.150
0.090
0.090
0.090
0.090
0.045
0.045
0.045
0.045
0.050
0.050
0.040
R
1max
(Ω)
15.00
15.00
6.000
5.000
5.000
3.000
3.000
1.400
1.400
1.400
1.400
0.450
0.450
0.450
0.450
0.250
0.250
0.250
0.250
0.160
0.160
0.160
Specifications are subject to change without notice
Revision 2017
Polymer PTC Thermistor
1/7
BHFUSE
BSMD1812 Series Surface Mount PTC Device
Part Number
BSMD1812-150-24V
BSMD1812-150-33V
BSMD1812-160-8V
BSMD1812-160-16V
BSMD1812-160-24V
BSMD1812-200-8V
BSMD1812-200-12V
BSMD1812-200-16V
BSMD1812-200-24V
BSMD1812-200-30V
BSMD1812-250-8V
BSMD1812-260-8V
BSMD1812-260-13.2V
BSMD1812-260-16V
BSMD1812-300-8V
BSMD1812-300-12V
BSMD1812-300-16V
BSMD1812-350-6V
BSMD1812-350-16V
BSMD1812-400-6V
I
hold
(A)
1.50
1.50
1.60
1.60
1.60
2.00
2.00
2.00
2.00
2.00
2.50
2.60
2.60
2.60
3.00
3.00
3.00
3.50
3.50
4.00
I
trip
(A)
3.00
3.00
3.20
3.20
3.20
4.00
4.00
4.00
4.00
4.00
5.00
5.20
5.20
5.20
6.00
6.00
6.00
7.00
7.00
8.00
V
max
(V
dc
)
24
33
8
16
24
8
12
16
24
30
8
8
13.2
16
8
12
16
6
16
6
I
max
(A)
40
40
100
100
40
100
100
100
40
40
40
100
40
40
100
100
40
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
2.0
2.0
2.0
Time to trip
(A)
(Sec)
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
10.00
10.00
10.00
0.50
0.50
1.00
1.00
1.00
2.00
2.00
2.00
2.00
2.00
2.50
2.50
2.50
2.50
4.00
4.00
4.00
4.00
4.00
4.00
R
i
(Ω)
0.040
0.040
0.030
0.030
0.030
0.020
0.020
0.020
0.020
0.020
0.015
0.010
0.010
0.010
0.010
0.010
0.010
0.008
0.008
0.005
R
1max
(Ω)
0.160
0.160
0.130
0.130
0.130
0.100
0.100
0.100
0.100
0.100
0.080
0.050
0.050
0.050
0.040
0.040
0.040
0.035
0.035
0.025
I
hold
= Hold current: maximum current device will pass without tripping in 25℃ still air.
I
trip
= Trip current: minimum current at which the device will trip in 25℃ 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 typ.
= Typical power dissipated from device when in the tripped state at 25℃ still air.
R
min
= Minimum resistance of device in initial (un-soldered) state.
R
1max
= Maximum resistance of device at 25℃ measured one hour after tripping or reflow soldering of 260℃ for 20 sec.
Caution：Operation
beyond the specified ratings may result in damage and possible arcing and flame.
WARNING
Users shall independently assess the suitability of these devices for each of their applications.
Operation of these devices beyond the stated maximum ratings could result in damage to the devices and lead to
electrical arcing and/or fire.
These devices are intended to protect against the effects of temporary over-current or over-temperature conditions
and are not intended to perform as protective devices where such conditions are expected to be repetitive or
prolonged in duration.
Exposure to silicon-based oils, solvents, electrolytes, acids, and similar materials can adversely affect the prolonged
of these PPTC devices.
These devices undergo thermal expansion under fault conditions, and thus shall be provided with adequate space
and be protected against mechanical stresses.
Circuits with inductance may generate a voltage (L di/dt) above the rated voltage of the PPTC device.
Specifications are subject to change without notice
Revision 2017
Polymer PTC Thermistor
2/7
BHFUSE
BSMD1812 Series Surface Mount PTC Device
Thermal Derating Curve
Typical Time-to-Trip At 25℃
Thermal Derating Chart
Part Number
BSMD1812-010
BSMD1812-014
BSMD1812-020
BSMD1812-030
BSMD1812-050
BSMD1812-075
BSMD1812-110
BSMD1812-125
BSMD1812-150
BSMD1812-160
BSMD1812-200
BSMD1812-260
BSMD1812-300
BSMD1812-350
BSMD1812-400
Ambient operating temperature hold current(I
hold
)
-40℃
0.16
0.23
0.29
0.44
0.69
1.10
1.60
2.00
2.10
2.30
2.88
3.90
4.15
4.84
4.97
-20℃
0.14
0.19
0.26
0.39
0.59
0.99
1.45
1.75
1.96
2.05
2.61
3.42
3.76
4.39
4.62
0℃
0.12
0.17
0.23
0.35
0.55
0.87
1.28
1.52
1.77
1.88
2.25
2.96
3.46
4.04
4.32
25℃
0.10
0.14
0.20
0.30
0.50
0.75
1.10
1.25
1.50
1.60
2.00
2.60
3.00
3.50
4.00
40℃
0.08
0.12
0.17
0.26
0.45
0.63
0.92
1.00
1.23
1.26
1.80
2.22
2.55
2.98
3.48
50℃
0.07
0.10
0.15
0.23
0.43
0.57
0.83
0.95
1.09
1.12
1.66
2.07
2.28
2.66
3.16
60℃
0.06
0.09
0.14
0.21
0.35
0.49
0.71
0.90
0.95
0.98
1.45
1.94
2.01
2.35
2.85
70℃
0.05
0.08
0.12
0.18
0.30
0.45
0.66
0.75
0.82
0.84
1.09
1.35
1.61
1.88
2.38
85℃
0.03
0.06
0.10
0.15
0.23
0.35
0.52
0.53
0.61
0.63
0.80
1.00
1.33
1.55
2.05
Specifications are subject to change without notice
Revision 2017
Polymer PTC Thermistor
3/7
BHFUSE
BSMD1812 Series Surface Mount PTC Device
Soldering Parameters
Profile Feature
Average Ramp-Up Rate(Ts
max
to T
p
)
Preheat
-Temperature Min(Ts
min
)
-Temperature Max(Ts
max
)
-Time(Ts
min
to Ts
max
)
Time maintained above:
-Temperature(T
L
)
-Time(t
L
)
Peak Temperature(T
p
)
Ramp-Down Rate
Time 25℃ to Peak Temperature
Storage Condition
Pb-Free Assembly
3℃/second max
150℃
200℃
60~180 seconds
217℃
60~150 seconds
260℃
6℃/second max
8 minutes max
0℃~30℃,30%-60%RH
Recommended reflow methods: IR, vapor phase oven, hot air oven, N
2
environment for lead-free.
Recommended maximum paste thickness is 0.25mm.
Devices can be cleaned using standard industry methods and solvents.
Note 1: All temperature refer to topside of the package, measured on the package body surface.
Note 2: If reflow temperatures exceed the recommended profile, devices may not meet the performance requirements.
Environmental Specifications
Test
Passive aging
Humidity aging
Thermal shock
Resistance to solvent
Vibration
Conditions
+85°C, 1000 hrs.
+85°C, 85% R.H. , 168 hours
+85°C to -40°C, 20 times
MIL-STD-202,Method 215
MIL-STD-202,Method 201
Resistance change
±5% typical
±5% typical
±33% typical
No change
No change
Ambient operating conditions : - 40 °C to +85 °C
Maximum surface temperature of the device in the tripped state is 125 °C
Specifications are subject to change without notice
Revision 2017
Polymer PTC Thermistor
4/7
BHFUSE
BSMD1812 Series Surface Mount PTC Device
Physical Dimensions & Recommended Pad Layout (mm)
A
1.78
1.78
B
B
010
014
D
E
C
3.45
Part Number
BSMD1812-010-30V
BSMD1812-010-60V
BSMD1812-014-60V
BSMD1812-020-30V
BSMD1812-020-60V
BSMD1812-030-30V
BSMD1812-030-60V
BSMD1812-050-15V
BSMD1812-050-24V
BSMD1812-050-30V
BSMD1812-050-60V
BSMD1812-075-13.2V
BSMD1812-075-16V
BSMD1812-075-24V
BSMD1812-075-33V
BSMD1812-110-8V
BSMD1812-110-16V
BSMD1812-110-24V
BSMD1812-110-33V
BSMD1812-125-16V
BSMD1812-125-24V
BSMD1812-150-8V
BSMD1812-150-16V
BSMD1812-150-24V
BSMD1812-150-33V
Marking
Quantity
A
Min
Max
Min
B
Max
Min
C
Max
D
Min
3.15
E
Min
B010
B010
B014
B020
B020
B030
B030
B050
B050
B050
B050
B075
B075
B075
B075
B110
B110
B110
B110
B125
B125
B150
B150
B150
B150
1500
1500
1500
1500
1500
1500
1500
1500
1500
1500
1500
1500
1500
1500
1500
1500
1500
1500
1500
1500
1500
1500
1500
1500
1500
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
4.73
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
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
3.41
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
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.40
0.40
0.40
0.50
0.50
0.50
0.50
0.50
0.40
0.40
0.40
0.60
0.60
0.60
0.60
0.60
0.80
0.80
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.00
1.00
1.00
1.10
1.10
1.10
1.10
1.10
1.00
1.00
1.00
1.30
1.30
1.30
1.30
1.30
1.50
1.50
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
0.30
0.30
0.30
0.30
0.30
0.30
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
0.25
0.25
0.25
0.25
0.25
0.25
Specifications are subject to change without notice
Revision 2017
Polymer PTC Thermistor
5/7
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