POLYSWITCH RESETTABLE
DEVICES
Surface-Mount Devices
PolySwitch surface-mount devices are an effective circuit
protection method for computer, consumer, multimedia,
portable and automotive electronics applications.
In an affort to reduce the size and cost of surface-
mount devices, Littelfuse PolySwitch team introduced
the miniSMD product series in 1995. Subsequently,
we developed the microSMD, nanoSMD, picoSMD and
femtoSMD family of products. The femtoSMD series
reduced the device size to a 1608mm (0603 mils)
footprint, which is one-twelfth the size of the popular
miniSMD series.
Recent additions to the PolySwitch surface-mount series
include 1.1A picoSMD 1210mm (0805 mils) and 0.35A
femtoSMD 1608mm (0603 mils) devices.
BENEFITS
• Smaller size helps save board space and cost
• Many product choices optimizes design flexibility
• Compatible with high-volume electronics assembly
• Assists in meeting regulatory requirements
• Higher voltage ratings allow use in new applications
APPLICATIONS
• Computer
• Portable electronics
• Multimedia
• Game machines
• Telephony and broadband
• Mobile phones
• Automotive
• Industrial controls
• Battery
FEATURES
• RoHS compliant
• Halogen free
(refers to: Br
≥
900ppm, Cl
≥
900ppm, Br+Cl
≥
1500ppm)
• Broadest range of resettable devices available in the
industry
• Current ratings from 0.05 to 3.1A
• Voltage ratings from 6V computer and electronic
applications to 60V telecom applications
• Agency recognition: UL, CSA, TÜV
• Small footprint
• Fast time-to-trip
• Low resistance
RoHS Compliant, ELV Compliant
Specifications subject to change without notice. ©2017 Littelfuse, Inc.
120
PolySwitch Resettable Devices
Surface-Mount Devices
Application Selection Table
• The table below lists PolySwitch surface-mount devices recommended for use in typical applications
• Specifications for the suggested PolySwitch surface-mount device part numbers can be found in this table
• Once a part has been selected, the user should evaluate and test each product for the intended application
PolySwitch Resettable Devices - Key Selection Criteria
Protection Application
AC Adapter Input Power
Battery Pack Protection
Charger Protection
CPU/IC Protection
Data Acquisition/Sensor
DC Input/Output Power
≤6V
≤12V
DDC
Device Bay System
DB12, DB20
DB32
Ethernet/LAN
Fan
HDMI
IEEE 802.3af
IEEE-1394
VoIP
Power Provider
Alt. Power Provider
Self-Powered
LCD Inverter
LCD Screen Power
LNB (Low Noise Block)
Motor
≤6V
≤13.2V
PS/2 Mouse/Keyboard
Signal - Data Communication
≤6V
≤13.2V
≤30V
SCSI
SIM/Smart Card Reader
Telecom - Modem
Telecom - PBX
Temperature Sensor
USB
Digital Line
Subscriber
CPU
Individual Port
2 Port Ganged
3 Port Ganged
OC
OC
Additional Comments
Use w/ Zener & Triac
Overcurrent
Overvoltage
Small Size
SMD250F
nanoSMDC150F
nanoSMDC050F
nanoSMDC110F
microSMD005F
nanoSMDC075F
miniSMDC075F
nanoSMDC075F
miniSMDC200F
miniSMDC260F
nanoSMDC050F/13.2
microSMD035F
picoSMDC035S
decaSMDC050F/60
SMD100F/33
SMD185F
SMD185F
nanoSMDC050F/13.2
nanoSMDC050F/13.2
SMD075F
nanoSMDC110F
miniSMDC075F
nanoSMDC075F
nanoSMDC075F
miniSMDC050F
SMD030F-2018
nanoSMDC110F
femtoSMDC010F
miniSMDC014F
miniSMDC014F
nanoSMDC050F/13.2
nanoSMDC075F
nanoSMDC150F
miniSMDC200F
Low Resistance
SMD250F
miniSMDC260F
miniSMDC110F/16
nanoSMDC150F
—
nanoSMDC150F
miniSMDC110F/16
nanoSMDC110F
miniSMDC260F
SMD300F
miniSMDC110F/16
microSMD050F
picoSMDC035S
decaSMDC050F/60
SMD185F
SMD185F
SMD185F
miniSMDC110F/16
nanoSMDC050F/13.2
SMD075F
nanoSMDC150F
miniSMDC110F/16
nanoSMDC110F
nanoSMDC075F
miniSMDC075F
SMD075F
nanoSMDC150F
femtoSMDC010F
miniSMDC014F
miniSMDC014F
nanoSMDC075F
nanoSMDC110F
miniSMDC150F
miniSMDC200F
Fast Time-to-trip
(Temperature Protection)
SMD200F
miniSMDE200F/16
nanoSMDC075F
nanoSMDC075F
microSMD005F
nanoSMDC050F/13.2
miniSMDC075F
nanoSMDC050F/13.2
miniSMDC200F
miniSMDC200F
nanoSMDC075F
microSMD035F
picoSMDC035S
decaSMDC050F/60
SMD100F/33
SMD150F/33
SMD150F/33
nanoSMDC075F
microSMD035F
SMD050F
microSMD075F
miniSMDC075F
nanoSMDC050F/13.2
nanoSMDC075F
miniSMDC020F
SMD050F
nanoSMDC075F
femtoSMDC005F
miniSMDC014F
miniSMDC014F
nanoSMDC050F/13.2
nanoSMDC050F/13.2
miniSMDC125F
miniSMDC200F
Note:
This list is not exhaustive. Littelfuse welcomes our customers’ input for additional application ideas for PolySwitch resettable devices.
121
Specifications subject to change without notice. ©2017 Littelfuse, Inc.
RoHS Compliant, ELV Compliant
PolySwitch Resettable Devices
Surface-Mount Devices
Table S1 — Product Series: Size, Current Rating, Voltage Rating/Maximum Resistance
femtoSMD
Size mm
(mils)
Hold Current (A)
0.050
0.080
0.100
15V
DC
/30.00Ω
12V
DC
/14.00Ω
12V
DC
/8.00Ω
—
0.120
0.140
0.160
0.200
0.250
0.300
0.350
0.500
0.750
9V
DC
/5.80Ω
—
9V
DC
/4.20Ω
9V
DC
/3.00Ω
—
—
6V
DC
/1.00Ω
—
—
—
—
1.000
—
—
1.100
—
—
—
1.200
1.250
—
—
—
1.500
—
—
—
—
1.600
1.750
1.850
2.000
—
—
—
—
—
2.500
2.600
—
—
—
—
—
3.000
—
—
3.100
—
—
—
15V
DC
/11.00Ω
—
15V
DC
/9.00Ω
—
—
9V
DC
/3.20Ω
—
—
6V
DC
/1.40Ω
6V
DC
/0.80Ω
6V
DC
/0.35Ω*
—
—
—
—
6V
DC
/0.17Ω*
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
60V
DC
/15.00Ω
—
48V
DC
/6.50Ω
—
48V
DC
/5.00Ω
24V
DC
/3.10Ω
16V
DC
/2.10Ω
—
16V
DC
/1.35Ω
13.2V
DC
/0.75Ω
6V
DC
/0.30Ω
—
—
—
—
6V
DC
/0.20Ω
—
—
—
—
—
6V
DC
/0.11Ω
—
—
—
—
—
—
6V
DC
/0.072Ω
—
—
—
—
—
—
—
—
—
30V
DC
/50Ω
—
30V
DC
/15Ω
—
—
—
—
—
—
—
6V
DC
/1.30Ω
13.2V
DC
/0.90Ω
6V
DC
/0.40Ω
—
—
—
—
6V
DC
/0.21Ω
—
—
—
—
—
6V
DC
/0.11Ω
—
—
—
—
6V
DC
/0.08Ω
—
6V
DC
/0.06Ω
—
—
—
—
—
—
—
—
—
—
—
60V
DC
/12.70Ω
—
—
60V
DC
/6.00Ω
—
30V
DC
/3.30Ω
—
30V
DC
/1.75Ω
—
24V
DC
/1.00Ω
13.2V
DC
/0.45Ω
24V
DC
/0.29Ω
33V
DC
/0.39Ω
—
—
8V
DC
/0.21Ω
16V
DC
/0.18Ω
24V
DC
/0.18Ω
—
6V
DC
/0.14Ω
16V
DC
/0.14Ω
6V
DC
/0.11Ω
12V
DC
/0.11Ω
16V
DC
/0.11Ω
24V
DC
/0.12Ω
9V
DC
/0.10Ω
—
—
8V
DC
/0.07Ω
16V
DC
/0.085Ω
—
6V
DC
/0.043Ω
12V
DC
/0.047Ω
13.2V
DC
/0.050Ω
16V
DC
/0.050Ω
6V
DC
/0.036Ω
—
—
—
—
—
—
—
—
—
—
—
60V
DC
/2.30Ω
—
—
—
—
—
15V
DC
/0.40Ω
—
—
—
—
—
—
—
15V
DC
/0.18Ω
—
—
—
—
—
—
6V
DC
/0.10Ω
—
—
—
—
—
—
—
—
—
1608
(0603)
picoSMD
2012
(0805)
nanoSMD
3216
(1206)
microSMD
3225
(1210)
miniSMD
4532
(1812)
midSMD
5050
(2018)
RoHS Compliant, ELV Compliant
Specifications subject to change without notice. ©2017 Littelfuse, Inc.
122
PolySwitch Resettable Devices
Surface-Mount Devices
Table S1 — Product Series: Size, Current Rating, Voltage Rating/Maximum Resistance
SMDC
Size mm
(mils)
Hold Current (A)
0.050
0.080
0.100
—
—
—
—
0.120
0.140
0.160
0.200
0.250
0.300
0.350
0.500
0.750
—
—
—
—
—
—
—
—
—
—
—
1.000
—
—
1.100
—
—
—
1.200
1.250
—
33V
DC
/0.25Ω
—
1.500
—
—
—
—
1.600
1.750
1.850
2.000
—
—
33V
DC
/0.15Ω
—
—
2.500
2.600
—
—
—
—
—
3.000
24V
DC
/0.072Ω
—
3.100
18V
DC
/0.036Ω
—
—
—
—
—
—
—
—
—
60V
DC
/4.80Ω
—
60V
DC
/1.40Ω
30V
DC
/1.00Ω
60V
DC
/1.00Ω
—
30V
DC
/0.48Ω
33V
DC
/0.41Ω
—
—
—
16V
DC
/0.34Ω
15V
DC
/0.25Ω
—
33V
DC
/0.23Ω
—
—
—
—
—
—
24V
DC
/0.125Ω
—
15V
DC
/0.085Ω
6V
DC
/0.075Ω
—
—
—
6V
DC
/0.048Ω
15V
DC
/0.05Ω
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
15V
DC
/0.25Ω
33V
DC
/0.23Ω
—
—
16V
DC
/0.15Ω
—
33V
DC
/0.165Ω
15V
DC
/0.125Ω
—
15V
DC
/0.85Ω
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
60V
DC
/1.10Ω
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
30V
DC
/10.0Ω
30V
DC
/11.0Ω
—
—
—
—
—
24V
DC
/1.95Ω
—
6V
DC
/0.90Ω
6V
DC
/0.36Ω
—
—
—
—
—
—
—
—
24V
DC
/0.24Ω
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
7555
(2920)
SMD
7555
(2920)
SMD2
8763
(3425)
decaSMD
5050
(2018)
(Cont’d)
High Temperature SMD
3216, 3225 & 7555
(1206), (1210) & (2920)
123
Specifications subject to change without notice. ©2017 Littelfuse, Inc.
RoHS Compliant, ELV Compliant
PolySwitch Resettable Devices
Surface-Mount Devices
Table S2 — Thermal Derating [Hold Current (A) at Ambient Temperature (°C)]
Part
Number
Maximum Ambient Temperature
-40°C
-20°C
0°C
20°C
25°C
40°C
50°C
60°C
70°C
80°C
85°C
125°C
femtoSMDC Series; Size 1608mm/0603mils
femtoSMDC005F
femtoSMDC008F
femtoSMDC010F
femtoSMDC012F
femtoSMDC016F
femtoSMDC020F
femtoSMDC035F
0.08
0.13
0.16
0.18
0.25
0.30
0.53
0.07
0.11
0.14
0.16
0.22
0.27
0.47
0.06
0.10
0.12
0.14
0.18
0.24
0.41
0.05
0.08
0.11
0.12
0.17
0.20
0.36
0.05
0.08
0.10
0.12
0.16
0.20
0.35
0.04
0.07
0.09
0.11
0.14
0.17
0.30
0.04
0.06
0.08
0.10
0.12
0.16
0.27
0.03
0.06
0.07
0.08
0.11
0.14
0.25
0.03
0.05
0.06
0.08
0.10
0.12
0.22
0.02
0.04
0.05
0.07
0.08
0.11
0.19
0.02
0.04
0.04
0.06
0.07
0.10
0.17
—
—
—
—
—
—
—
picoSMDC Series; Size 2012mm/0805mils
picoSMDC010S
picoSMDC012S
picoSMDC020S
picoSMDC035S
picoSMDC050S
picoSMDC075S
picoSMDC110S
0.17
0.20
0.30
0.55
0.70
1.13
1.64
0.15
0.17
0.27
0.49
0.62
1.01
1.47
0.13
0.15
0.24
0.44
0.55
0.90
1.30
0.11
0.13
0.21
0.37
0.55
0.78
1.14
0.10
0.12
0.20
0.35
0.50
0.75
1.10
0.09
0.10
0.18
0.31
0.43
0.67
0.97
0.08
0.09
0.16
0.28
0.38
0.61
0.89
0.07
0.08
0.15
0.26
0.33
0.55
0.80
0.06
0.07
0.13
0.23
0.30
0.49
0.72
0.05
0.06
0.12
0.20
0.28
0.43
0.64
0.05
0.05
0.11
0.18
0.26
0.40
0.59
—
—
—
—
—
—
—
nanoSMDC Series; Size 3216mm/1206mils
nanoSMDC010F
nanoSMDC012F
nanoSMDC016F
nanoSMDC020F
nanoSMDC025F
nanoSMDC035F
nanoSMDC050F/13.2
0.15
0.20
0.21
0.34
0.38
0.58
0.78
1.15
1.64
2.20
2.92
0.14
0.17
0.20
0.30
0.33
0.51
0.69
1.04
1.46
1.99
2.64
0.12
0.15
0.18
0.26
0.30
0.44
0.61
0.92
1.30
1.77
2.35
0.10
0.13
0.16
0.22
0.26
0.38
0.52
0.78
1.10
1.55
2.07
0.10
0.12
0.16
0.20
0.25
0.35
0.50
0.75
1.06
1.50
2.00
0.09
0.11
0.14
0.17
0.22
0.31
0.44
0.69
0.92
1.34
1.79
0.08
0.10
0.13
0.15
0.20
0.28
0.39
0.63
0.83
1.23
1.64
0.07
0.09
0.12
0.13
0.19
0.24
0.35
0.58
0.80
1.10
1.50
0.06
0.08
0.11
0.11
0.16
0.21
0.30
0.51
0.65
1.01
1.36
0.05
0.07
0.10
0.09
0.13
0.18
0.25
0.46
0.56
0.90
1.22
0.05
0.07
0.09
0.08
0.11
0.16
0.24
0.43
0.52
0.84
1.15
—
—
—
—
—
—
—
—
—
—
—
nanoSMDC075F
nanoSMDC110F
nanoSMDC150F
nanoSMDC200F
microSMD Series; Size 3225mm/1210mils
microSMD005F
microSMD010F
microSMD035F
microSMD050F
microSMD075F
microSMD110F
microSMD150F
microSMD175F
microSMD200F
0.08
0.15
0.51
0.76
1.10
1.60
2.30
2.80
2.60
0.07
0.13
0.46
0.66
0.97
1.42
2.02
2.45
2.44
0.06
0.12
0.40
0.58
0.86
1.26
1.76
2.10
2.35
0.05
0.10
0.35
0.50
0.75
1.10
1.50
1.75
2.00
0.05
0.10
0.34
0.48
0.72
1.06
1.43
1.70
1.96
0.04
0.09
0.30
0.42
0.64
0.94
1.24
1.55
1.78
0.04
0.08
0.27
0.38
0.58
0.86
1.11
1.45
1.67
0.03
0.06
0.24
0.35
0.55
0.80
1.00
1.35
1.50
0.03
0.06
0.22
0.29
0.47
0.70
0.85
1.25
1.45
0.02
0.05
0.19
0.25
0.42
0.62
0.72
1.15
1.15
0.02
0.05
0.18
0.23
0.39
0.58
0.65
1.10
1.10
—
—
—
—
—
—
—
—
—
miniSMDC Series; Size 4532mm/1812mils
miniSMDC010F
miniSMDC014F
miniSMDC020F
miniSMDC030F
miniSMDC050F
miniSMDC075F
miniSMDC075F/24
0.17
0.23
0.30
0.49
0.59
1.10
1.50
0.15
0.20
0.27
0.44
0.57
0.99
1.25
0.13
0.17
0.23
0.39
0.55
0.87
1.00
0.11
0.14
0.20
0.32
0.50
0.75
0.75
0.10
0.13
0.19
0.30
0.48
0.72
0.73
0.09
0.11
0.17
0.27
0.45
0.63
0.65
0.08
0.10
0.15
0.24
0.43
0.57
0.60
0.07
0.09
0.13
0.22
0.35
0.49
0.55
0.06
0.07
0.12
0.18
0.30
0.45
0.50
0.05
0.06
0.10
0.16
0.25
0.39
0.45
0.04
0.05
0.09
0.14
0.23
0.35
0.43
—
—
—
—
—
—
—
RoHS Compliant, ELV Compliant
Specifications subject to change without notice. ©2017 Littelfuse, Inc.
124
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