Multifuse
®
Products
Bourns
®
Multifuse
®
family of Polymer Positive
Temperature Coefficient (PPTC) “resettable
fuses” are used in a wide variety of circuit
protection applications.
Under fault conditions the device resistance
will rise exponentially and remain in a
“tripped” state, providing continuous circuit
protection until the fault is removed. Once the
fault is removed and the power cycled the device
will return to its normal low resistance state.
Applications
• Computer
• Battery
• Automotive
• Telecommunications
• Industrial
• Consumer
What’s New in this Edition
• Telecom Rated Products
• MF-R/90
• MF-R/250
• MF-R/600
Features/Benefits
• Resettable circuit protection
• Agency approval - UL, CSA, TÜV
• Popular footprints and packaging options
• Low resistance
• Lead free options
• Custom designs available
What’s Next
• Full line of SMD lead-free products
• MF-MSMF - Available 3rd Quarter 2003
Multifuse
®
Products - How They Work
Crystalline
Polymer
Amorphous
Polymer
Conducting
Carbon Chains
Non-conducting
Carbon Chains
COLD
HOT
Multifuse
®
Products - How They’re Used
I=V/RMF
Log Resistance
I
+t°
I=V/RL
Temperature
PTC Response Characteristic
Typical Circuit Application
RMF
VS
RL
Definitions
Agency Approvals
Bourns
®
PTCs are certified under UL, CSA, IEC and
TÜV registration programs.
Current, Hold (Ihold)
The maximum current a PTC device can pass without
interruption.
Current, Maximum (Imax)
The maximum fault current a PTC device can withstand
without damage at the rated voltage.
Current, Trip (Itrip)
The minimum current that will switch a PTC from the
low resistance to the high resistance state.
Fault Current
The peak current that flows through a PTC or wire
during a short circuit or arc back.
Positive Temperature Coefficient (PTC)
A characteristic of the PTC device that describes the large
increase in resistance as the device reaches its switching
(trip) temperature.
Resistance, Post Trip (R1max)
The maximum resistance one hour after a PTC device
has been tripped and power has been removed.
Resistance, Post Reflow (R1max)
The maximum resistance one hour after a PTC surface
mount device has been reflow soldered.
Voltage, Maximum (Vmax)
The maximum voltage a PTC device can withstand
without damage at the rated current.
Product Selection Worksheet
1. What is the normal circuit operating current (Ihold)_________
2. What is the maximum circuit voltage (Vmax)______________
3. What is the maximum fault current (Imax)________________
4. What is the preferred form factor________________________
Note: Other factors including thermal derating and time to
trip characteristics may be important application considera-
tions. Please refer to the full Bourns
®
data sheet of each
product at www.bourns.com.
How To Order
MF - R 012/250 U - A 05 - 2
Multifuse
®
Product Designator
Series
R
RX
SM
MSMD
ESMD
USMD
S
LR
LS
SVS
VSN
VS
= Radial Leaded
= Radial Leaded
= Surface Mount
= Surface Mount
= Surface Mount
= Surface Mount
= Axial Leaded Strap
= Axial Leaded Strap
= Axial Leaded Strap
= Axial Leaded Strap
= Axial Leaded Strap
= Axial Leaded Strap
Hold Current, Ihold
Voltage Options:
Max. Interrupt Voltage, V
Construction Options:
N = Narrow Device Option (3.6 mm)*
S = Slotted Lead Option (one side)*
SS = Slotted Lead Option (two sides)*
L = Longer Lead Option*
U = Uncoated
T = Pretripped **
Resistance Sorted**
(see individual data sheets)
Agency File Numbers
®
Resistance Bins of 0.5
Ω**
05 = 0.5
Ω
Packaging Options
- 0 = Bulk Packaging
- 2 = Tape and Reel
- AP = Ammo-Pak
*Axial Leaded Strap products only.
**Telecom Radial Leaded products only.
UL File Number ............................................E 174545S
CSA File Number ..........................................CA 110338
TÜV File Number ..........................................R2057213
®
TÜV Rheinland
Product Safety
Radial Leaded Low Voltage Products
Style 1
A
Features
• Bulk and Tape and Reel Packaging
• Industry Standard Sizes
Style 2
A
Style 3
A
Style 4
A
Style 5
A
Applications
B
B
B
B
B
C
C
C
C
C
• Computers and Peripherals
• General Electronics
• Automotive
• Consumer Appliances
• Electronic Toys
MF-RX Series
Radial Leaded
Ihold
Amperes
at 23 °C
MF-R Series
Radial Leaded
Ihold
Amperes
at 23 °C
Initial
Resistance
V max.
Volts
I max.
Amps
16-60 Volts
0.05-11 Amps Hold Current
1 Hour (R1)
Post-Trip
Resistance
Ohms at 23 °C
Min.
Max.
Dimensions
mm/(in)
Style
A Max.
B Max.
C Nom.
60 Volts
1.10-3.75 Amps Hold Current
Initial
Resistance
1 Hour (R1)
Post-Trip
Resistance
Ohms at 23 °C
Min.
Max.
Dimensions
mm/(in)
Style
A Max.
B Max.
C Nom.
Model
Model
V max.
Volts
I max.
Amps
MF-R005
MF-R010
MF-R017
MF-R020
MF-R025
MF-R030
MF-R040
MF-R050
MF-R065
MF-R075
MF-R090
MF-R090-0-9
MF-R110
MF-R135
MF-R160
MF-R185
MF-R250
MF-R250-0-10
MF-R300
MF-R400
MF-R500
MF-R600
MF-R700
MF-R800
MF-R900
MF-R1100
0.05
0.10
0.17
0.20
0.25
0.30
0.40
0.50
0.65
0.75
0.90
0.90
1.10
1.35
1.60
1.85
2.50
2.50
3.00
4.00
5.00
6.00
7.00
8.00
9.00
11.00
60
60
60
60
60
60
60
60
60
60
60
30
30
30
30
30
30
30
30
30
30
30
30
30
30
16
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
100
7.3
2.50
2.00
1.50
1.00
0.76
0.52
0.41
0.27
0.18
0.14
0.07
0.10
0.065
0.055
0.040
0.025
0.025
0.020
0.010
0.010
0.005
0.005
0.005
0.005
0.003
22.0
7.50
8.00
4.40
3.00
2.10
1.29
1.17
0.72
0.60
0.47
0.22
0.27
0.17
0.15
0.11
0.07
0.07
0.08
0.05
0.05
0.04
0.03
0.03
0.02
0.014
8.0
(0.315)
7.4
(0.291)
7.4
(0.291)
7.4
(0.291)
7.4
(0.291)
7.4
(0.291)
7.4
(0.291)
7.9
(0.311)
9.7
(0.382)
10.4
(0.409)
11.7
(0.461)
7.4
(0.291)
8.9
(0.350)
8.9
(0.350)
10.2
(0.402)
12.0
(0.472)
12.0
(0.472)
11.4
(0.449)
12.0
(0.472)
14.4
(0.567)
17.4
(0.685)
19.3
(0.760)
22.1
(0.870)
24.2
(0.953)
24.2
(0.953)
24.2
(0.953)
8.3
(0.327)
12.7
(0.500)
12.7
(0.500)
12.7
(0.500)
12.7
(0.500)
13.4
(0.528)
13.7
(0.539)
13.7
(0.539)
15.2
(0.598)
16.0
(0.630)
16.7
(0.657)
12.2
(0.480)
14.0
(0.551)
18.9
(0.744)
16.8
(0.661)
18.4
(0.724)
18.3
(0.720)
18.3
(0.720)
18.3
(0.720)
24.8
(0.976)
24.9
(0.980)
31.9
(1.256)
29.8
(1.173)
32.9
(1.295)
32.9
(1.295)
32.9
(1.295)
5.1
(0.201)
5.1
(0.201)
5.1
(0.201)
5.1
(0.201)
5.1
(0.201)
5.1
(0.201)
5.1
(0.201)
5.1
(0.201)
5.1
(0.201)
5.1
(0.201)
5.1
(0.201)
5.1
(0.201)
5.1
(0.201)
5.1
(0.201)
5.1
(0.201)
5.1
(0.201)
5.1
(0.201)
5.1
(0.201)
5.1
(0.201)
5.1
(0.201)
10.2
(0.402)
10.2
(0.402)
10.2
(0.402)
10.2
(0.402)
10.2
(0.402)
10.2
(0.402)
4
1
1
1
1
1
1
1
1
1
1
3
1
1
1
1
2
3
2
2
2
2
2
2
2
2
MF-RX110
MF-RX135
MF-RX160
MF-RX185
MF-RX250
MF-RX300
MF-RX375
1.10
1.35
1.60
1.85
2.50
3.00
3.75
60
60
60
60
60
60
60
40
40
40
40
40
40
40
0.15
0.12
0.09
0.08
0.05
0.04
0.03
0.38
0.30
0.22
0.19
0.13
0.10
0.08
13.0
(0.512)
14.5
(0.571)
16.3
(0.642)
17.8
(0.701)
21.3
(0.839)
24.9
(0.980)
28.4
(1.118)
18.0
(0.709)
19.6
(0.772)
21.3
(0.839)
22.9
(0.902)
26.4
(1.039)
30.0
(1.181)
33.5
(1.319)
5.1
(0.201)
5.1
(0.201)
5.1
(0.201)
5.1
(0.201)
10.2
(0.402)
10.2
(0.402)
10.2
(0.402)
5
5
5
5
5
5
5
MF-R and MF-RX Series are available lead-free on request. Contact your
nearest Bourns representative.
Surface Mount Low Voltage Products
Style 1
C
A
B
B
A
Side View
End View
Top and Bottom View
Side View
Top and Bottom View
Side View
B
C
Features
• Tape and Reel Packaging
• Industry Standard Sizes
Style 2
Style 3
A
C
Applications
• Computers and Peripherals
• General Electronics
• Automotive
MF-SM Series
(2920 package)
6-60 Volts
Surface Mount
0.30-2.60 Amps Hold Current
Ihold
Amperes
at 23 °C
Initial
Resistance
V max.
Volts
I max.
Amps
1 Hour (R1)
Post-Trip
Resistance
Ohms at 23 °C
Min.
Max.
Dimensions
mm/(in)
Style
A Max.
B Max.
C Max.
MF-USMD Series
(1210 package)
6-30 Volts
Surface Mount
0.05-1.10 Amps Hold Current
Ihold
Amperes
V max.
at 23 °C
Volts
Initial 1 Hour (R1)
Resistance Post-Trip
Resistance
I max.
Ohms at 23 °C
Amps
Min.
Max.
Dimensions
mm/(in)
Style
A Max.
B Max.
C Max.
Model
Model
MF-SM030
MF-SM050
MF-SM075
MF-SM100
MF-SM100/33
MF-SM125
MF-SM260
0.30
0.50
0.75
1.10
1.10
1.25
2.60
60
60
30
30
33
15
6
40
40
80
80
40
100
100
0.90
0.35
0.23
0.12
0.12
0.07
0.025
4.80
1.40
1.00
0.48
0.41
0.25
0.075
7.98
(0.314)
7.98
(0.314)
7.98
(0.314)
7.98
(0.314)
7.98
(0.314)
7.98
(0.314)
7.98
(0.314)
3.18
(0.125)
3.18
(0.125)
3.18
(0.125)
3.00
(0.118)
3.00
(0.118)
3.00
(0.118)
3.00
(0.118)
5.44
(0.214)
5.44
(0.214)
5.44
(0.214)
5.44
(0.214)
5.44
(0.214)
5.44
(0.214)
5.44
(0.214)
1
1
1
1
1
1
1
MF-USMD005
MF-USMD010
MF-USMD020
MF-USMD035
MF-USMD050
MF-USMD075
MF-USMD110
0.05
0.10
0.20
0.35
0.50
0.75
1.10
30.0
30.0
30.0
6.0
13.2
6.0
6.0
10
10
10
40
40
40
40
2.80
0.80
0.40
0.20
0.18
0.07
0.05
50.0
15.0
5.00
1.30
0.90
0.450
0.210
3.43
(0.135)
3.43
(0.135)
3.43
(0.135)
3.43
(0.135)
3.43
(0.135)
3.43
(0.135)
3.43
(0.135)
2.80
(0.110)
2.80
(0.110)
2.80
(0.110)
2.80
(0.110)
2.80
(0.110)
2.80
(0.110)
2.80
(0.110)
0.85
(0.033)
0.85
(0.033)
0.85
(0.033)
0.62
(0.024)
0.62
(0.024)
0.62
(0.024)
0.48
(0.019)
2
2
2
2
2
2
2
MF-SM Series
(3425 package)
15-33 Volts
Surface Mount
1.50-2.50 Amps Hold Current
Ihold
Amperes
at 23 °C
Initial
Resistance
V max.
Volts
I max.
Amps
1 Hour (R1)
Post-Trip
Resistance
Ohms at 23 °C
Min.
Max.
Dimensions
mm/(in)
Style
A Max.
B Max.
C Max.
MF-ESMD Series
(Low Resistance, Low Trip Temp.)
16 Volts
Surface Mount
1.9 Amps Hold Current
Ihold
Amperes
V max.
at 23 °C
Volts
Initial 1 Hour (R1)
Resistance Post-Trip
Resistance
I max.
Ohms at 23 °C
Amps
Min.
Max.
Dimensions
mm/(in)
Style
A Max.
B Max.
C Max.
Model
Model
MF-SM150
MF-SM150/33
MF-SM185/33
MF-SM200
MF-SM250
1.50
1.50
1.80
2.00
2.50
15
33
33
15
15
100
40
40
100
100
0.06
0.06
0.04
0.045
0.024
0.25
0.23
0.15
0.125
0.085
9.50
(0.374)
9.50
(0.374)
9.50
(0.374)
9.50
(0.374)
9.50
(0.374)
3.00
(0.118)
3.00
(0.118)
3.00
(0.118)
3.00
(0.118)
3.00
(0.118)
6.71
(0.264)
6.71
(0.264)
6.71
(0.264)
6.71
(0.264)
6.71
(0.264)
1
1
1
1
1
MF-ESMD190
1.9
16
100
0.010
0.08
11.61
5.33
0.63
(0.457) (0.210) (0.025)
2
Available 3rd Quarter 2003! Consult factory for details.
MF-MSMF Series
(1812 package)
6-13.2 Volts
Surface Mount
0.50-1.50 Amps Hold Current
Ihold
Amperes
V max.
at 23 °C
Volts
Initial 1 Hour (R1)
Resistance Post-Trip
Resistance
I max.
Ohms at 23 °C
Amps
Min.
Max.
Dimensions
mm/(in)
Style
A Max.
B Max.
C Max.
MF-MSMD Series
(1812 package)
6-60 Volts
Surface Mount
0.10-2.60 Amps Hold Current
Ihold
Amperes
V max.
at 23 °C
Volts
Initial 1 Hour (R1)
Resistance Post-Trip
Resistance
I max.
Ohms at 23 °C
Amps
Min.
Max.
Dimensions
mm/(in)
Style
A Max.
B Max.
C Max.
Model
Model
MF-MSMF050
MF-MSMF075
MF-MSMF110
MF-MSMF150
0.50
0.75
1.10
1.50
15.0
13.2
6.0
6.0
100
100
100
100
0.15
0.11
0.04
0.03
1.00
0.45
0.21
0.120
MF-MSMD010
MF-MSMD014
MF-MSMD020
MF-MSMD030
MF-MSMD050
MF-MSMD075
MF-MSMD075/24*
MF-MSMD110
MF-MSMD110/16
MF-MSMD125
MF-MSMD150
MF-MSMD160
MF-MSMD200
MF-MSMD260
*UL pending
0.10
0.14
0.20
0.30
0.50
0.75
0.75
1.10
1.10
1.25
1.50
1.60
2.00
2.60
60.0
60.0
30.0
30.0
15.0
13.2
24.0
6.0
16.0
6.0
6.0
8.0
6.0
6.0
40
40
80
10
100
100
40
100
100
100
100
100
100
100
0.70
0.40
0.40
0.30
0.15
0.11
0.11
0.04
0.04
0.035
0.03
0.035
0.020
0.015
15.00
6.50
6.00
3.00
1.00
0.45
0.45
0.21
0.21
0.14
0.120
0.099
0.100
0.080
4.73
(0.186)
4.73
(0.186)
4.73
(0.186)
4.73
(0.186)
4.73
(0.186)
4.73
(0.186)
4.73
(0.186)
4.73
(0.186)
4.73
(0.186)
4.73
(0.186)
4.73
(0.186)
4.73
(0.186)
4.73
(0.186)
4.73
(0.186)
3.41
(0.134)
3.41
(0.134)
3.41
(0.134)
3.41
(0.134)
3.41
(0.134)
3.41
(0.134)
3.41
(0.134)
3.41
(0.134)
3.41
(0.134)
3.41
(0.134)
3.41
(0.134)
3.41
(0.134)
3.41
(0.134)
3.41
(0.134)
0.81
(0.032)
0.81
(0.032)
0.81
(0.032)
0.81
(0.032)
0.62
(0.024)
0.62
(0.024)
0.62
(0.024)
0.62
(0.024)
0.62
(0.024)
0.48
(0.019)
0.48
(0.019)
0.48
(0.019)
0.48
(0.019)
0.48
(0.019)
2
2
2
2
2
2
2
2
2
2
2
2
2
2
4.73
(0.186)
4.73
(0.186)
4.73
(0.186)
4.73
(0.186)
3.41
(0.134)
3.41
(0.134)
3.41
(0.134)
3.41
(0.134)
0.75
(0.030)
0.75
(0.030)
0.75
(0.030)
0.75
(0.030)
3
3
3
3
PCB Design
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