POLYSWITCH RESETTABLE
DEVICES
Strap Battery Devices
Littelfuse PolySwitch, a pioneer of polymeric positive
temperature coefficient (PPTC) resettable devices, offers
several material platforms to help protect battery
applications. Each of these material platforms offers
different performance characteristics that allow the
engineer greater design flexibility. PolySwitch devices
for battery protection include SRP, LR4, VTP, VLP,
VLR, MXP and MGP series, disc and special application
strap devices.
BENEFITS
• Many material platforms and device form factors
help provide engineers more design flexibility
• Compatible with high-volume electronics assembly
• Assists in meeting regulatory requirements
• Low-resistance devices increase battery
operating time
FEATURES
• RoHS compliant
• Lead-free versions of all devices are available
• Broad range of resettable devices available
• Current ratings from 1.1A to 13A
• Voltage ratings from 6V to 30V
• Agency recognition: UL, CSA, TÜV
• Fast time-to-trip
• Low resistance
APPLICATIONS
• Mobile phone and smart phone battery packs
• Tablet PC battery packs
• Mobile radio battery packs
• Computer battery packs
• Digital camera battery packs
• Portable media player battery packs
• Power tools (charge line)
RoHS Compliant, ELV Compliant Specifications subject to change without notice. ©2016 Littelfuse, Inc.
Table B1 — Product Series - Current Rating, Voltage Rating / Typical Resistance
Hold
Current (A)
VLR VLP VTP MXP SRP LR4
Typical Activation Temperature
85°C 90°C 90°C 120°C 125°C 125°C
1. 10 — — 16V/0.054Ω———
1.20 —16V/0.053Ω— — 15V/0.123Ω—
1.70 12V/0.025Ω—16V/0.041Ω———
1.75 12V/0.024Ω16V/0.032Ω16V/0.040Ω—15V/0.070Ω—
1.80 ———6V/0.0105Ω— —
1.90 ———6V/0.011Ω—15V/0.056Ω
2.00 ————30V/0.045Ω—
2.10 —16V/0.024Ω16V/0.024Ω———
2.20 —16V/0.023Ω————
2.30 12V/0.015Ω—————
2.50 ———6V/0.011Ω— —
2.60 —————15V/0.031Ω
2.70 —16V/0.015Ω—6V/0.0105Ω— —
3.10 ———6V/0.0075Ω— —
3.50 ————30V/0.024Ω—
3.70 ———6V/0.007Ω— —
3.80 —————15V/0.020Ω
4.20 ————30V/0.018Ω—
4.50 —————20V/0.016Ω
5.50 —————20V/0.013Ω
6.00 —————20V/0.011Ω
7.30 —————20V/0.009Ω
9.00 —————20V/0.008Ω
13.00 —————20V/0.006Ω
Application Selection Guide
The guide below lists PolySwitch strap battery devices which are typically used in applications.
The following pages contain the specifications for the part numbers recommended below.
Once a device is selected, the user should evaluate and test each product for its intended application.
Protection Application Additional Comments
PolySwitch Resettable Devices — Key Device Selection Criteria
Installation Method Lowest Resistance Lowest Thermal Cut-off
Mobile Phone Battery Packs Li-ion Surface-mount Refer to Surface-mount Section of this Catalog
Prismatic MXP370BD VLR175F
Cordless Phone Battery Packs NiMH Cylindrical VLP210F —
SRP175F
Mobile Radio Battery Packs NiMH Cylindrical LR4-380F —
SRP350F
Computer Battery Packs NiMH Cylindrical LR4-900F —
Li-ion Cylindrical LR4-1300SSF —
Prismatic Consult Local Rep Consult Local Rep
Camcorder Battery Packs NiMH or Li-ion Prismatic VLP270F VTP210GF
LR4-380F —
PDA Battery Packs Li-ion Prismatic VLP220F VLR175F
Power Tools (Charge Line) NiCd, NiMH or Li-ion Cylindrical Custom LR4 Custom VTP
RoHS Compliant, ELV Compliant
Specifications subject to change without notice. ©2016 Littelfuse, Inc.
PolySwitch Resettable Devices
Strap Battery Devices
Part
Number
Maximum Ambient Temperature
-40°C
A
-20°C 0°C 20°C 25°C 40°C 50°C 60°C 70°C 80°C 85°C
125°C Typical Activation
SRP
SRP120F 1. 9 1. 7 1. 5 1.20 1. 17 1. 0 0.9 0.8 0.6 0.5 0.4
SRP175F 2.5 2.2 2.0 1.75 1.68 1. 4 1. 3 1. 2 1. 0 0.9 0.8
SRP200F 3.1 2.8 2.5 2.00 1.97 1. 7 1. 5 1. 4 1. 2 1. 0 0.9
SRP350F 5.3 4.8 4.3 3.50 3.44 3.0 2.7 2.5 2.1 1. 8 1. 7
SRP420F 6.3 5.7 5.1 4.20 4.11 3.6 3.3 3.0 2.6 2.2 2.1
LR4
LR4-190F 2.8 2.5 2.3 1. 9 1.86 1. 6 1. 5 1. 4 1. 2 1. 1 1. 0
LR4-260F 3.8 3.4 3.1 2.6 2.54 2.2 2.0 1. 9 1. 7 1. 4 1. 3
LR4-380F 5.4 4.9 4.4 3.8 3.64 3.3 3.0 2.8 2.5 2.3 2.1
LR4-380XF 5.4 4.9 4.4 3.8 3.64 3.3 3.0 2.8 2.5 2.3 2.1
LR4-450F 6.5 5.8 5.3 4.5 4.38 3.9 3.6 3.3 2.9 2.6 2.4
LR4-550F 7. 6 6.9 6.2 5.5 5.32 4.7 4.3 4.0 3.6 3.2 3.0
LR4-600F 8.7 7. 8 7. 1 6.0 5.86 5.2 4.7 4.4 3.9 3.4 3.2
LR4-600XF 8.7 7. 8 7. 1 6.0 5.86 5.2 4.7 4.4 3.9 3.4 3.2
LR4-730F 10.5 9.5 8.6 7. 3 7. 13 6.3 5.7 5.4 4.7 4.2 4.0
LR4-900F 12.7 11. 4 10.0 9.0 8.50 7. 5 6.8 6.2 5.5 4.9 4.5
LR4-1300SSF 1 7. 9 16.2 14.5 13.0 12.40 11. 1 10.3 9.5 8.6 7. 7 7. 2
* Product electrical characteristics determined at 25°C.
Part
Number
Maximum Ambient Temperature
-40°C
A
-20°C 0°C 20°C 25°C 40°C 50°C 60°C 70°C 75°C 80°C 85°C 90°C
120°C Typical Activation
MXP*
MXP180 — — 2.45 —1. 8 — — 0.80 —————
MXP190BB — — 2.6 —1. 9 — — 0.85 —————
MXP250K — — 3.6 —2.5 — — 1. 3 —————
MXP270 — — 3.8 —2.7 — — 1. 4 ————0.3
MXP310 — — 5.0 —3.1 — — 1. 9 —1. 0 ———
MXP370BD — — 5.0 —3.7 — — 1. 9 —————
120˚C Typical Activation
MGP
MGP450 ————4.5 — — 2.6 —————
MGP500 ————5.0 — — 3.0 2.0 ————
Table B2 — Thermal Derating [Hold Current (A) at Ambient Temperature (°C)]
Part
Number
Maximum Ambient Temperature
-40°C
A
-20°C 0°C 20°C 25°C 40°C 50°C 60°C 70°C 80°C 85°C
85°C Typical Activation
VLR*
VLR170F 3.5 2.9 2.4 1.84 1.70 1. 2 1. 0 0.7 0.3 — —
VLR175F 3.5 2.9 2.4 1.87 1.75 1. 3 1. 0 0.8 0.3 — —
VLR175LF 3.5 2.9 2.4 1.87 1.75 1. 3 1. 0 0.8 0.3 — —
VLR230F 5.0 4.2 3.4 2.52 2.30 1. 7 1. 3 0.9 0.4 — —
90°C Typical Activation
VLP*
VLP120UF 2.4 2.1 1. 8 1.30 1.20 1. 0 0.7 0.6 0.3 0.2 0.1
VLP175UAF 3.2 2.7 2.3 1.70 1.75 1.2 1. 0 0.9 0.5 0.2 0.1
VLP210F 4.3 3.6 2.9 2.31 2.10 1. 6 1. 3 1. 0 0.6 0.3 0.1
VLP220F 4.5 3.8 3.0 2.45 2.20 1. 7 1. 4 1. 1 0.7 0.3 0.1
VLP270F 5.6 4.7 4.0 3.05 2.70 2.2 1. 7 1. 4 0.9 0.4 0.1
VTP*
VTP110F 2.0 1. 7 1. 4 1.12 1. 10 0.85 0.75 0.7 0.4 0.2 0.1
VTP170F 3.2 2.7 2.2 1.80 1.70 1. 3 1. 0 0.8 0.5 0.3 0.1
VTP170XSF 3.2 2.7 2.2 1.80 1.70 1. 3 1. 0 0.8 0.5 0.3 0.1
VTP175F 3.2 2.7 2.2 1.84 1.75 1. 3 1. 0 0.8 0.5 0.3 0.1
VTP175LF 3.2 2.7 2.2 1.84 1.75 1. 3 1. 0 0.8 0.5 0.3 0.1
VTP210GF 4.1 3.5 2.9 2.26 2.10 1. 6 1. 3 1. 0 0.7 0.4 0.1
VTP210SF 4.1 3.5 2.9 2.26 2.10 1. 6 1. 3 1. 0 0.7 0.4 0.1
RoHS Compliant, ELV Compliant Specifications subject to change without notice. ©2016 Littelfuse, Inc.
PolySwitch Resettable Devices
Strap Battery Devices
Figure B1 — Thermal Derating Curve
A = LR4
B = SRP
C = VTP, VLP, MXP
D = MGP
E = VLR
F = RSD
Table B3 — Electrical Characteristics
Part
Number
IHITVMAX IMAX PD MAX Max Time-to-trip RMIN RMAX R1MAX
Figure for
Dimension
(A) (A) (VDC)(A) (W) (A) (s) (Ω) (Ω) (Ω)
85°C Typical Activation
VLR*
VLR170F 1.70 4.1 12 100 1. 4 8.50 5.0 0.018 0.032 0.064 B3
VLR175F 1.75 4.2 12 100 1. 4 8.75 5.0 0.017 0.031 0.062 B3
VLR175LF 1.75 4.2 12 100 1. 4 8.75 5.0 0.017 0.031 0.062 B3
VLR230F 2.30 5.0 12 100 2.5 10.00 5.0 0.012 0.018 0.036 B3
90°C Typical Activation
VLP*
VLP120UF 1.20 3.6 16 60 1. 6 7. 0 0 5.0 0.039 0.067 0.134 B5
VLP175UAF 1.75 3.9 16 60 1. 8 8.75 5.0 0.023 0.041 0.082 B5
VLP210F 2.10 5.0 16 60 1. 8 10.50 5.0 0.018 0.030 0.060 B2
VLP220F 2.20 5.3 16 60 1. 8 11. 0 0 5.0 0.017 0.029 0.058 B3
VLP270F 2.70 6.5 16 60 2.5 13.50 5.0 0.012 0.018 0.036 B3
VTP*
VTP110F 1. 10 2.7 16 100 1. 3 5.50 5.0 0.038 0.070 0.140 B5
VTP170F 1.70 3.4 16 100 1. 4 8.50 5.0 0.030 0.052 0.105 B2
VTP170XSF 1.70 3.4 16 100 1. 4 8.50 5.0 0.030 0.052 0.105 B4
VTP175F 1.75 3.6 16 100 1. 4 8.75 5.0 0.029 0.051 0.102 B3
VTP175LF 1.75 3.6 16 100 1. 4 8.75 5.0 0.029 0.051 0.102 B3
VTP210GF 2.10 4.7 16 100 1. 5 10.00 5.0 0.018 0.030 0.060 B3
VTP210SF 2.10 4.7 16 100 1. 5 10.00 5.0 0.018 0.030 0.060 B4
120°C Typical Activation
MXP*
MXP180 1.80 5.2 650 1. 0 9.00 5.0 0.007 0.014 0.024 B10
MXP190BB 1.90 4.9 650 1. 0 9.50 2.0 0.007 0.015 0.024 B9
MXP250K 2.50 6.2 650 1.0 13.50 2.0 0.006 0.016 0.028 B10
MXP270 2.70 6.2 650 1. 0 13.50 2.0 0.006 0.015 0.026 B10
MXP310 3.10 9.0 650 1. 3 17.50 5.0 0.003 0.012 0.018 B10
MXP370BD 3.70 9.0 650 1. 3 18.50 5.0 0.004 0.010 0.016 B10
* Product electrical characteristics determined at 25°C.
Figure B1
% of Rated Hold and Trip Current
200
180
160
140
120
100
80
60
40
20
0
A
B
C
Temperature (˚C)
-50-30-40-10-20201004030 6050 8070 90
D
E
A
B
C
DE
F
F
RoHS Compliant, ELV Compliant
Specifications subject to change without notice. ©2016 Littelfuse, Inc.
PolySwitch Resettable Devices
Strap Battery Devices
Figures B2-B12 — Dimension Figures
Table B3 — Electrical Characteristics (Cont’d)
Part
Number
IHITVMAX IMAX PD MAX Max Time-to-trip RMIN RMAX R1MAX
Figure for
Dimension
(A) (A) (VDC)(A) (W) (A) (s) (Ω) (Ω) (Ω)
120˚C Typical Activation
MGP
MGP450 4.50 9.2 650 1. 5 25.00 5.0 0.0025 0.007 0.013 B11
MGP500 5.00 9.2 650 1. 5 25.00 5.0 0.0025 0.0065 0.013 B12
125°C Typical Activation
SRP
SRP120F 1.20 2.7 15 100 1. 2 6.00 5.0 0.085 0.160 0.220 B6
SRP175F 1.75 3.8 15 100 1. 5 8.75 5.0 0.050 0.090 0.120 B6
SRP200F 2.00 4.4 30 100 1. 9 10.00 4.0 0.030 0.060 0.100 B6
SRP350F 3.50 6.3 30 100 2.5 20.00 3.0 0.017 0.031 0.050 B6
SRP420F 4.20 7. 6 30 100 2.9 20.00 6.0 0.012 0.024 0.040 B6
LR4
LR4-190F 1.90 3.9 15 100 1. 2 9.5 5.0 0.0390 0.0720 0.102 B7
LR4-260F 2.60 5.8 15 100 2.5 13.0 5.0 0.0200 0.0420 0.063 B7
LR4-380F 3.80 8.3 15 100 2.5 19.0 5.0 0.0130 0.0260 0.037 B7
LR4-380XF 3.80 8.3 15 100 2.5 19.0 5.0 0.0130 0.0260 0.037 B7
LR4-450F 4.50 8.9 20 100 2.3 22.5 5.0 0.0110 0.0200 0.028 B7
LR4-550F 5.50 10.5 20 100 2.8 27.5 5.0 0.0090 0.0160 0.022 B7
LR4-600F 6.00 11. 7 20 100 2.8 30.0 5.0 0.0070 0.0140 0.019 B7
LR4-600XF 6.00 11. 7 20 100 2.8 30.0 5.0 0.0075 0.0140 0.019 B7
LR4-730F 7.30 14.1 20 100 3.3 30.0 5.0 0.0060 0.0120 0.015 B7
LR4-900F 9.00 16.7 20 100 3.8 45.0 5.0 0.0060 0.0100 0.014 B7
LR4-1300SSF 13.00 21.2 20 100 4.5 50.0 10.0 0.0035 0.0065 0.009 B8
* Product electrical characteristics determined at 25°C.
Figure B2 Figure B3 Figure B4
A
A
A
B
B
BB
B
B
B B
B B
F
FF
F
F
FF
F F
D
E
D E
D E D E
D E
D E D E
D E
D ED E
D E D E
Cto
LC
L
C
C
AC C
A
BF
D E
C
AA
A
CC
C
BF
AC
AC
B
D E
AC
BF
D E
ACAC
AC
B
B F
A
A
C
D
C
A
A A
B
B
BB
B
B
B B
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F
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E
D E
D E D E
D E
D E D E
D E
D ED E
D E
D E
Cto
LC
L
C
C
AC
C
A
BF
D E
C
AA
A
CC
C
BF
AC
AC
B
D E
AC
BF
D E
ACAC
AC
B
B F
A
A
C
D
C
A
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B
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B
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B B
B
B
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D E D E
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D E D E
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D ED E
D E
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Cto
LC
L
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CAC
C
A
BF
D E
C
AA
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CC
C
BF
AC
AC
B
D E
AC
BF
D E
ACAC
AC
B
B F
A
A
C
D
C
Notes
IH : Hold current: maximum current device will pass without interruption in 20°C still air unless otherwise specified.
IT : Trip current: minimum current that will switch the device from low-resistance to high-resistance in 20°C still air unless otherwise specified.
VMAX : Maximum voltage device can withstand without damage at rated current.
IMAX : Maximum fault current device can withstand without damage at rated voltage.
PD : Power dissipated from device when in the tripped state in 20°C still air unless otherwise specified.
RMIN : Minimum resistance of device as supplied at 20°C unless otherwise specified.
RMAX : Maximum resistance of device as supplied at 20°C unless otherwise specified.
R1MAX : Maximum resistance, measured at 20°C unless otherwise specified, of device one hour after being tripped the first time.
RoHS Compliant, ELV Compliant Specifications subject to change without notice. ©2016 Littelfuse, Inc.
PolySwitch Resettable Devices
Strap Battery Devices
Figures B2-B12 — Dimension Figures (Cont’d)
A
A A
B
B
BB
B
B
B
B
B BF
FF
F
F
F
F
F F
D
E
D E
D E D E
D E
D E D E
D E
D E
D E
D E D E
Cto
LC
L
C
CAC C
A
BF
D E
C
AA
A
CC
C
BF
AC
AC
B
D E
AC
BF
D E
ACAC
AC
B
B F
A
A
C
D
C
A
A A
B
B
BB
B
B
B
B
B BF
FF
F
F
F
F
F F
D
E
D E
D E D E
D E
D E D E
D E
D E
D E
D E D E
Cto
LC
L
C
CAC C
A
BF
D E
C
AA
A
CC
C
BF
AC
AC
B
D E
AC
BF
D E
ACAC
AC
B
B F
A
A
C
D
C
A
A A
B
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BB
B
B
B B
B BF
FF
F
F
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F F
D
E
D E
D E D E
D E
D E D E
D E
D ED E
D E D E
Cto
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L
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CAC C
A
BF
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C
AA
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C
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D E
ACAC
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B F
A
A
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C
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B
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B
B B
B BF
FF
F
F
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F F
D
E
D E
D E D E
D E
D E
D E
D E
D ED E
D E D E
Cto
LC
L
C
CAC C
A
BF
D E
C
AA
A
CC
C
BF
AC
AC
B
D E
AC
BF
D E
ACAC
AC
B
B F
A
A
C
D
C
A
A A
B
B
BB
B
B
B B
B BF
FF
F
F
FF
F F
D
E
D E
D E D E
D E
D E D E
D E
D ED E
D E D E
Cto
LC
L
C
CAC C
A
BF
D E
C
AA
A
CC
C
BF
AC
AC
B
D E
AC
BF
D E
ACAC
AC
B
B F
A
A
C
D
C
B D
C
A
Table B4 — Dimensions in Millimeters (Inches)
Part
Number
A B C D E F G
Figure
Min Max Min Max Min Max Min Max Min Max Min Max Min Max
85°C Typical Activation
VLR
VLR170F 20.8 23.2 3.5 3.9 —0.8 4.5 6.5 4.5 6.5 2.4 2.6 — — B3
(0.832) (0.928) (0.140) (0.156) —(0.032) (0.180) (0.260) (0.180) (0.260) (0.096) (0.104) — —
VLR175F 23.0 24.5 2.9 3.3 0.5 0.8 4.7 7. 2 3.8 5.4 2.4 2.6 — — B3
(0.920) (0.980) (0.116) (0.132) (0.020) (0.032) (0.188) (0.288) (0.152) (0.216) (0.096) (0.104) — —
VLR175LF 29.3 31.7 2.9 3.3 —0.8 5.2 6.8 10 12.5 2.4 2.6 — — B3
(1.172) (1.268) (0.116) (0.132) —(0.032) (0.208) (0.272) (0.400) (0.500) (0.096) (0.104) — —
VLR230F 20.9 23.1 4.9 5.3 —0.8 4.1 5.8 4.1 5.8 3.9 4.1 — — B3
(0.836) (0.924) (0.196) (0.212) —(0.032) (0.164) (0.232) (0.164) (0.232) (0.156) (0.164) — —
90°C Typical Activation
VLP
VLP120UF 10.9 11. 8 4.4 4.6 —0.7 5.5 6.5 1.65 1. 9 2.3 2.5 — — B5
(0.430) (0.460) (0.170) (0.180) —(0.028) (0.220) (0.260) (0.065) (0.075) (0.091) (0.098) — —
VLP175UAF 23.6 25.6 2.7 2.9 —0.7 7. 0 8.0 7. 0 8.0 2.3 2.5 — — B5
(0.944) (1.024) (0.108) (0.116) —(0.028) (0.280) (0.320) (0.280) (0.320) (0.092) (0.100) — —
VLP210F 15.4 1 7. 5 6.9 7. 3 0.6 0.8 4.0 6.2 4.0 6.2 3.9 4.1 — — B2
(0.616) (0.700) (0.276) (0.292) (0.024) (0.032) (0.160) (0.248) (0.160) (0.248) (0.156) (0.164) — —
VLP220F 21.1 23.3 3.5 3.9 0.6 0.8 5.1 6.8 5.1 6.8 2.9 3.1 — — B3
(0.844) (0.932) (0.140) (0.156) (0.024) (0.032) (0.204) (0.272) (0.204) (0.272) (0.116) (0.124) — —
VLP270F 20.9 23.1 4.9 5.3 0.6 0.8 4.1 5.8 4.1 5.8 3.9 4.1 — — B3
(0.836) (0.924) (0.196) (0.212) (0.024) (0.032) (0.164) (0.232) (0.164) (0.232) (0.156) (0.164) — —
Figure B5
Figure B8
Figure B11
Figure B6
Figure B9
Figure B12
Figure B7
Figure B10
BF
A
D E
C
B
F
A
R1.2
R0.3
D
G
G
C
RoHS Compliant, ELV Compliant
Specifications subject to change without notice. ©2016 Littelfuse, Inc.
PolySwitch Resettable Devices
Strap Battery Devices
Table B4 — Dimensions in Millimeters (Inches) (Cont’d)
Part
Number
A B C D E F G
Figure
Min Max Min Max Min Max Min Max Min Max Min Max Min Max
VTP
VTP110F 23.6 25.6 2.7 2.9 —0.7 7. 0 8.0 7. 0 8.0 2.3 2.5 — — B5
(0.944) (1.024) (0.108) (0.116) —(0.028) (0.280) (0.320) (0.280) (0.320) (0.092) (0.100) — —
VTP170F 15.4 1 7. 5 7. 0 7. 4 0.5 0.8 4.0 6.2 4.0 6.2 3.9 4.1 — — B2
(0.616) (0.700) (0.280) (0.296) (0.020) (0.032) (0.160) (0.248) (0.160) (0.248) (0.156) (0.164) — —
VTP170XSF 20.9 22.9 4.9 5.3 0.5 0.8 6.0 8.6 6.0 8.6 3.9 4.1 — — B4
(0.836) (0.916) (0.196) (0.212) (0.020) (0.032) (0.240) (0.344) (0.240) (0.344) (0.156) (0.164) — —
VTP175F 21.2 23.2 3.5 3.9 —0.8 4.6 6.6 4.6 6.6 2.9 3.1 — — B3
(0.848) (0.928) (0.140) (0.156) —(0.032) (0.184) (0.264) (0.184) (0.264) (0.116) (0.124) — —
VTP175LF 25.8 28.2 3.5 3.9 —0.8 5.7 7. 3 8.7 10.3 2.4 2.6 — — B3
(1.032) (1.128) (0.140) (0.156) —(0.032) (0.228) (0.292) (0.348) (0.412) (0.096) (0.104) — —
VTP210GF 20.9 23.1 4.9 5.3 —0.8 4.1 5.8 4.1 5.8 3.9 4.1 — — B3
(0.836) (0.924) (0.196) (0.212) —(0.032) (0.164) (0.232) (0.164) (0.232) (0.156) (0.164) — —
VTP210SF 20.9 23.1 4.9 5.3 0.6 0.8 4.1 5.8 4.1 5.8 3.9 4.1 — — B4
(0.836) (0.924) (0.196) (0.212) (0.024) (0.032) (0.164) (0.232) (0.164) (0.232) (0.156) (0.164) — —
120°C Typical Activation
MXP
MXP180 9.4 10.0 2.3 2.6 0.7 1. 1 1. 9 2.1 — — — — — — B10
(0.37) (0.39) (0.09) (0.10) (0.02) (0.04) (0.07) (0.08) — — — — — —
MXP190BB 9.2 10.8 2.96 3.26 0.7 1. 1 1. 6 3.1 1. 6 3.1 2.2 2.4 — — B9
(0.36) (0.43) (0.12) (0.13) (0.03) (0.04) (0.06) (0.12) (0.06) (0.12) (0.09) (0.10) — —
MXP250K 11.75 12.35 2.3 2.7 0.7 1. 1 2.4 2.6 — — — — — — B10
(0.46) (0.49) (0.09) (0.11) (0.03) (0.04) (0.09) (0.10) — — — — — —
MXP270 10.3 11. 5 2.3 2.7 0.7 1. 1 2.1 — 2.1 — 1. 9 2.1 — — B9
(0.40) (0.45) (0.09) (0.10) (0.02) (0.04) (0.08) — (0.08) — (0.07) (0.08) — —
MXP310 14.5 16.5 2.96 3.26 0.65 0.95 4.6 — 4.6 — 2.2 2.4 — — B9
(0.57) (0.65) (0.11) (0.13) (0.03) (0.04) (0.18) — (0.18) — (0.09) (0.10) — —
MXP370BD 10.5 11. 3 2.96 3.26 0.7 1. 1 2.0 — 2.0 — 2.2 2.4 — — B9
(0.41) (0.44) (0.11) (0.12) (0.02) (0.04) (0.07) — (0.07) — (0.08) 0.09) — —
120˚C Typical Activatio
MGP
MGP450 13.0 14.0 2.96 3.26 — 0.95 3.0 — 3.0 — 2.2 2.4 — — B11
(0.51) (0.55) (0.12) (0.13) —(0.04) (0.12) —(0.12) — (0.09) (0.09) — —
MGP500 14.5 15.5 2.96 3.26 — 0.95 5.5 7. 0 2.0 — 2.3 2.5 3.95 4.05 B12
(0.57) (0.61) (0.12) (0.13) —(0.04) (0.22) (0.28) (0.08) — (0.09) (0.10) (0.16) (0.16)
125°C Typical Activation
SRP
SRP120F 19.9 22.1 4.9 5.2 0.6 1.0 5.5 7. 5 5.5 7. 5 3.9 4.1 — — B6
(0.796) (0.884) (0.196) (0.208) (0.024) (0.040) (0.220) (0.300) (0.220) (0.300) (0.156) (0.164) — —
SRP175F 20.9 23.1 4.9 5.2 0.6 1.0 4.1 5.5 4.1 5.5 3.9 4.1 — — B6
(0.836) (0.924) (0.196) (0.208) (0.024) (0.040) (0.164) (0.220) (0.164) (0.220) (0.156) (0.164) — —
SRP200F 21.3 23.4 10.2 11. 0 0.5 1. 1 5.0 7. 6 5.0 7. 6 4.8 5.4 — — B6
(0.852) (0.936) (0.408) (0.440) (0.020) (0.044) (0.200) (0.304) (0.200) (0.304) (0.192) (0.216) — —
SRP350F 28.4 31.8 13.0 13.5 0.5 1. 1 6.3 8.9 6.3 8.9 6.0 6.6 — — B6
(1.136) (1.272) (0.520) (0.540) (0.020) (0.044) (0.252) (0.356) (0.252) (0.356) (0.240) (0.264) — —
SRP420F 30.6 32.4 12.9 13.6 0.5 1. 1 5.0 7. 5 5.0 7. 5 6.0 6.7 — — B6
(1.224) (1.296) (0.516) (0.544) (0.020) (0.044) (0.200) (0.300) (0.200) (0.300) (0.240) (0.268) — —
RoHS Compliant, ELV Compliant Specifications subject to change without notice. ©2016 Littelfuse, Inc.
PolySwitch Resettable Devices
Strap Battery Devices
Figures B13-B19 — Typical Time-to-Trip Curve at 20°C
VLR (data at 25°C)
A = VLR170F
B = VLR175F
C = VLR230F
Figure B13
Time-to-Trip (s)
Fault Current (A)
10 0
10
1
0.10
0.01
0.001
11
01
00
A
A
B
C
B
C
Table B4 — Dimensions in Millimeters (Inches) (Cont’d)
Part
Number
A B C D E F G
Figure
Min Max Min Max Min Max Min Max Min Max Min Max Min Max
LR4
LR4-190F 19.9 22.1 4.9 5.5 0.6 1. 0 5.5 7. 5 5.5 7. 5 3.9 4.1 — — B7
(0.796) (0.884) (0.196) (0.220) (0.024) (0.040) (0.220) (0.300) (0.220) (0.300) (0.156) (0.164) — —
LR4-260F 20.9 23.1 4.9 5.5 0.6 1. 0 4.1 5.5 4.1 5.5 3.9 4.1 — — B7
(0.836) (0.924) (0.196) (0.220) (0.024) (0.040) (0.164) (0.220) (0.164) (0.220) (0.156) (0.164) — —
LR4-380F 24.0 26.0 6.9 7. 5 0.6 1. 0 4.1 5.5 4.1 5.5 4.9 5.1 — — B7
(0.960) (1.040) (0.276) (0.300) (0.024) (0.040) (0.164) (0.220) (0.164) (0.220) (0.196) (0.204) — —
LR4-380XF 32.2 35.8 4.9 5.5 0.6 1. 0 5.5 7. 5 5.5 7. 5 3.9 4.1 — — B7
(1.288) (1.432) (0.196) (0.220) (0.024) (0.040) (0.220) (0.300) (0.220) (0.300) (0.156) (0.164) — —
LR4-450F 24.0 26 9.9 10.5 0.6 1. 0 5.3 6.7 5.3 6.7 5.9 6.1 — — B7
(0.960) (1.040) (0.396) (0.420) (0.024) (0.040) (0.212) (0.268) (0.212) (0.268) (0.236) (0.244) — —
LR4-550F 35.0 37.0 6.9 7. 5 0.6 1. 0 5.3 6.7 5.3 6.7 4.9 5.1 — — B7
(1.400) (1.480) (0.276) (0.300) (0.024) (0.040) (0.212) (0.268) (0.212) (0.268) (0.196) (0.204) — —
LR4-600F 24.0 26.0 13.9 14.5 0.6 1. 0 4.1 5.5 4.1 5.5 5.9 6.1 — — B7
(0.960) (1.040) (0.556) (0.580) (0.024) (0.040) (0.164) (0.220) (0.164) (0.220) (0.236) (0.244) — —
LR4-600XF 40.5 42.7 6.9 7. 5 0.6 1. 0 5.2 6.8 5.2 6.8 4.9 5.1 — — B7
(1.620) (1.708) (0.276) (0.300) (0.024) (0.040) (0.208) (0.272) (0.208) (0.272) (0.196) (0.204) — —
LR4-730F 27.1 29.1 13.9 14.5 0.6 1. 0 4.1 5.5 4.1 5.5 5.9 6.1 — — B7
(1.084) (1.164) (0.556) (0.580) (0.024) (0.040) (0.164) (0.220) (0.164) (0.220) (0.236) (0.244) — —
LR4-900F 45.4 47.6 7. 9 8.5 0.9 1. 3 4.6 6.2 4.6 6.2 5.9 6.1 — — B7
(1.816) (1.904) (0.316) (0.340) (0.036) (0.052) (0.184) (0.248) (0.184) (0.248) (0.236) (0.244) — —
LR4-1300SSF 61.5 66.5 9.4 10.0 0.9 1. 3 5.0 7. 5 5.0 7. 5 5.9 6.1 — — B8
(2.460) (2.660) (0.376) (0.400) (0.036) (0.052) (0.200) (0.300) (0.200) (0.300) (0.236) (0.244) — —
RoHS Compliant, ELV Compliant
Specifications subject to change without notice. ©2016 Littelfuse, Inc.
PolySwitch Resettable Devices
Strap Battery Devices
Figures B13-B19 — Typical Time-to-Trip Curve at 20°C (Cont’d)
VLP (data at 25°C)
A = VLP120UF
B = VLP175UAF
C = VLP210F
D = VLP220F
E = VLP270F
VTP (data at 25°C)
A = VTP110F
B = VTP170F
C = VTP175F
D = VTP210GF
MXP (data at 25°C)
A = MXP180
B = MXP190BB
C = MXP250K
D = MXP270
E = MXP310
F = MXP370BD
Figure B14
Figure B15
Figure B16
Time-to-Trip (s)
Fault Current (A)
10 0
10
1
0.10
0.01
0.001
0.0001
11
01
00
A
A
BCD
D
E
E
B
C
Time-to-Trip (s)
Fault Current (A)
10 0
10
1
0.10
0.01
0.001
11
01
00
B
A
B
C
D
C
D
A
Typical Time-to-Trip (s)
Fault Current (A)
10
1
0.10
0.01
0.001
110 10 0
A
BC
DE
F
B
C
D
E
F
A
RoHS Compliant, ELV Compliant Specifications subject to change without notice. ©2016 Littelfuse, Inc.
PolySwitch Resettable Devices
Strap Battery Devices
MGP
A = MGP450
B = MGP500
LR4
A = LR4-190F
B = LR4-260F
C = LR4-380F
D = LR4-450F
E = LR4-550F
F = LR4-600F
G = LR4-730F
H = LR4-900F
I = LR4-1300SSF
Figure B17
Figure B19
SRP
A = SRP120F
B = SRP175F
C = SRP200F
D = SRP350F
E = SRP420F
Figure B18
Typical Time-to-Trip (s)
Fault Current (A)
10 0
10
1
0.10
0.01
11
01
00
A
A
B
B
C
C
D
D
E
E
Typical Time-to-Trip (s)
Fault Current (A)
10 0
10
1
0.10
0.01
11
01
00
A
A
B
B
C
C
D
D
E
E
F
F
G
G
H
H
I
I
Figures B13-B19 — Typical Time-to-Trip Curve at 20°C (Cont’d)
Time-to-Trip (s)
10 0
10
1
0.1
0.01
Fault Current (A)
11
01
00
AB
A
B
RoHS Compliant, ELV Compliant
Specifications subject to change without notice. ©2016 Littelfuse, Inc.
PolySwitch Resettable Devices
Strap Battery Devices
Table B5 — Physical Characteristics and Environmental Specifications
VLR
Physical Characteristics
Lead Material 0.125mm Nominal Thickness, Quarter-hard Nickel
Tape Material Polyester
Environmental Specifications
Test Conditions Resistance Change
Passive Aging -40°C, 1000 hrs ±5% typ
60°C, 1000 hrs ±20% typ
Humidity Aging 60°C/95% RH, 1000 hrs ±30% typ
Thermal Shock 85°C, -40°C (10 Times) ±5% typ
Vibration MIL-STD-883D, Method 2026 No Change
VLP and VTP
Physical Characteristics
Lead Material 0.125mm Nominal Thickness, Quarter-hard Nickel
Tape Material Polyester
Environmental Specifications
Test Conditions Resistance Change
Passive Aging -40°C, 1000 hrs ±5% typ
60°C, 1000 hrs ±10% typ
Humidity Aging 60°C/95% RH, 1000 hrs ±10% typ
Thermal Shock 85°C, -40°C (10 Times) ±5% typ
Vibration MIL-STD-883D, Method 2026 No Change
MXP and MGP
Physical Characteristics
Lead Material 0.1mm Nominal Thickness,Half-hard Nickel
Coating Material Epoxy
Environmental Specifications
Test Conditions Resistance Change
Passive Aging -40°C, 1000 hrs ±5% typ
60°C, 1000 hrs ±20% typ
Humidity Aging 60°C/95% RH, 1000 hrs ±30% typ
Thermal Shock 85°C, -40°C (10 Times) ±5% typ
Vibration MIL-STD-883D, Method 2026 No Change
SRP
Physical Characteristics
Lead Material 0.125mm Nominal Thickness, Quarter-hard Nickel
Tape Material Polyester
Environmental Specifications
Test Conditions Resistance Change
Passive Aging 70°C, 1000 hrs ±10% typ
Humidity Aging 85°C/85% RH, 7 Days ±5% typ
Vibration MIL-STD-883C, Test Condition A No Change
Note: Storage conditions: 40°C max., 70% RH max.; devices should remain in original sealed bags prior to use.
Devices may not meet specified values if these storage conditions are exceeded.
RoHS Compliant, ELV Compliant Specifications subject to change without notice. ©2016 Littelfuse, Inc.
PolySwitch Resettable Devices
Strap Battery Devices
Table B6 — Packaging and Marking Information/Agency Recognition
Part
Number
Bag
Quantity
Tape and Reel
Quantity
Standard Package
Quantity Part Marking Agency Recognition
85°C Typical Activation
VLR
VLR170F 1,000 —10,000 R17 UL, CSA,TÜV
VLR175F 1,000 —10,000 R1X UL, CSA,TÜV
VLR175LF 1,000 —10,000 R1X UL, CSA,TÜV
VLR230F 1,000 —10,000 R23 UL, CSA,TÜV
90°C Typical Activation
VLP
VLP120UF 1,000 —10,000 —UL, CSA, TÜV
VLP175UAF 1,000 —10,000 —UL, CSA, TÜV
VLP210F 1,000 —10,000 W21 UL, CSA, TÜV
VLP220F 1,000 —10,000 W22 UL, CSA, TÜV
VLP270F 1,000 —10,000 W27 UL, CSA, TÜV
VTP
VTP110F 1,000 —10,000 —UL, CSA, TÜV
VTP170F 1,000 —10,000 V17 UL, CSA, TÜV
VTP170XSF 1,000 —10,000 V17 UL, CSA, TÜV
VTP175F 1,000 —10,000 V1X UL, CSA, TÜV
VTP175LF 1,000 —10,000 V1X UL, CSA, TÜV
VTP210GF 1,000 —10,000 V21 UL, CSA, TÜV
VTP210SF 1,000 —10,000 V21 UL, CSA, TÜV
120°C Typical Activation
MXP
MXP180 2,000 —48,000 —UL, CSA, TÜV
MXP190BB 2,000 —48,000 —UL, CSA, TÜV
MXP250K 2,000 —48,000 —UL, CSA, TÜV
MXP270 2,000 —48,000 —UL
MXP310 2,000 —48,000 —UL
MXP370BD 2,000 —48,000 —UL, CSA, TÜV
120˚C Typical Activation
MGP
MGP450 2,000 —48,000 — —
MGP500 2,000 —48,000 —UL, TÜV
Table B5 — Physical Characteristics and Environmental Specifications (Cont’d)
LR4
Physical Characteristics
Lead Material 0.125mm Nominal Thickness, Quarter-hard Nickel
Tape Material Polyester
Environmental Specifications
Test Conditions Resistance Change
Passive Aging 70°C, 1000 hrs ±10% typ
Humidity Aging 85°C/85% RH, 7 Days ±5% typ
Vibration MIL-STD-883D, Method 2026 No Change
Note: Storage conditions: 40°C max., 70% RH max.; devices should remain in original sealed bags prior to use.
Devices may not meet specified values if these storage conditions are exceeded.
RoHS Compliant, ELV Compliant
Specifications subject to change without notice. ©2016 Littelfuse, Inc.
PolySwitch Resettable Devices
Strap Battery Devices
Table B6 — Packaging and Marking Information/Agency Recognition (Cont’d)
Part
Number
Bag
Quantity
Tape and Reel
Quantity
Standard Package
Quantity Part Marking Agency Recognition
125°C Typical Activation
SRP
SRP120F 1,000 —10,000 120 UL, CSA, TÜV
SRP175F 2,000 —10,000 175 UL, CSA, TÜV
SRP200F 1,000 —10,000 200 UL, CSA, TÜV
SRP350F 500 —10,000 350 UL, CSA, TÜV
SRP420F 500 —10,000 420 UL, CSA, TÜV
LR4
LR4-190F 2,000 —10,000 E19 UL, CSA, TÜV
LR4-260F 1,000 —10,000 E26 UL, CSA, TÜV
LR4-380F 1,000 —10,000 E38 UL, CSA, TÜV
LR4-380XF 1,000 —10,000 E38 UL, CSA, TÜV
LR4-450F 1,000 —10,000 E45 UL, CSA, TÜV
LR4-550F 1,000 —10,000 E55 UL, CSA, TÜV
LR4-600F 1,000 —10,000 E60 UL, CSA, TÜV
LR4-600XF 1,000 —10,000 E60 UL, CSA, TÜV
LR4-730F 1,000 —10,000 E73 UL, CSA, TÜV
LR4-900F 500 —10,000 E90 UL, CSA, TÜV
LR4-1300SSF 250 —10,000 EX3 UL, CSA, TÜV
Agency Recognition
UL File # E74889
CSA File # 78165C
TÜV Certificate Number Available on Request
Installation Guidelines for the Strap Family
• PPTC devices operate by thermal expansion of the conductive polymer. If devices are placed under pressure or installed in spaces that would
prevent thermal expansion, they may not properly protect against damage caused by fault conditions. Designs must be selected in such a
manner that adequate space is maintained over the life of the product.
• Twisting, bending, or placing the PPTC device in tension will decrease the ability of the device to protect against damage caused by electrical
faults. No residual force should remain on device after installation. Mechanical damage to the PPTC device may affect device performance and
should be avoided.
• Chemical contamination of PPTC devices should be avoided. Certain greases, solvents, hydraulic fluids, fuels, industrial cleaning agents, volatile
components of adhesives, silicones, and electrolytes can have an adverse effect on device performance.
• PPTC strap devices are intended to be resistance welded to battery cells or to pack interconnect straps, yet some precautions must be taken
when doing so. In order for the PPTC device to exhibit its specified performance, weld placement should be a minimum of 2mm from the edge
of the PPTC device, weld splatter must not touch the PPTC device, and welding conditions must not heat the PPTC device above its maximum
operating temperature.
• PPTC strap devices are not intended for applications where reflow onto flex circuits or rigid circuit boards is required.
• The polyester tape on PPTC strap devices is intended for marking and identification purposes only, not for electrical insulation.
• The coating on MXP and MGP devices is intended to prevent oxidization/aging of the devices. Damaging the coating or causing the coating to
delaminate can have negative effects on device performance and should be avoided.
• MXP and MGP devices have a small PPTC chip size and therefore have weaker peel strength between the polymer and Ni-foil of the chip.
Excessive mechanical force to the device may cause delamination of Ni-foil from the polymer.
RoHS Compliant, ELV Compliant Specifications subject to change without notice. ©2016 Littelfuse, Inc.
PolySwitch Resettable Devices
Strap Battery Devices
Modifier
B, BB = Modified Resistance Window
D = Short Leaded Strap
F = Lead-free Version
G = Global Design (Standard Product)
L = Long Lead or Leads
S = Slit Lead
SS = Both Leads Slit
U = Untaped
X = Rotated Chip
Hold Current Indicator
Product Series
Warning :
• Users should independently evaluate the suitability of and test each product selected for their own application.
• Operation beyond the maximum ratings or improper use may result in device damage and possible electrical arcing and flame.
• These devices are intended for protection against damage caused by occasional overcurrent or overtemperature fault conditions and should
not be used when repeated fault conditions or prolonged trip events are anticipated.
• Contamination of the PPTC material with certain silicone-based oils or some aggressive solvents can adversely impact the performance of the devices.
• Device performance can be impacted negatively if devices are handled in a manner inconsistent with recommended electronic, thermal, and
mechanical procedures for electronic components.
• PPTC devices are not recommended for installation in applications where the device is constrained such that its PTC properties are inhibited,
for example in rigid potting materials or in rigid housings, which lack adequate clearance to accommodate device expansion.
• Operation in circuits with a large inductance can generate a circuit voltage (Ldi/dt) above the rated voltage of the device.
Part Numbering System
Notice:
Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own
applications. Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, military, aerospace, medical, life-saving, life-
sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the
product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by
Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims
or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse
products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse.
RoHS Compliant, ELV Compliant
Specifications subject to change without notice. ©2016 Littelfuse, Inc.
PolySwitch Resettable Devices
Strap Battery Devices