PolySwitch
®
Resettable PTCs
Surface Mount > LoRho Series
Low Rho SMD Series
Description
PolySwitch
®
low resistivity SMD (surface-mount device) is
a versatile device well suited for general applications which
have space-constrained, low power dissipation and high
environmental reliability requirements.
The devices can help provide both overcurrent and
overtemperature protection for battery pack PCMs
(protection circuit modules), circuit PCBA and signal/power
I/O interface. The resettable feature ensures the device will
“Trip” and protect the application during the faults and yet
regain the functions once the error is removed.
Features
Agency Approvals
AGENCY
AGENCY FILE NUMBER
078165 *
E74889 *
R 72161796 *
* - See
Electrical Characteristic Table
for approved part numbers.
• Current ratings from 1.75
to 6.0A
• Maximum electrical
rating: 6VDC and short
circuit current 50A
• Halogen free
(Br≤900ppm,
Cl≤900ppm, and
Br+Cl≤1500ppm)
Applications
• Mobile and smart
phones
• Wearable devices
• Portable game console
• VR/AR head mount
display (HMD)
• Tablets and eBook
• Ultra low internal
resistance
• Automatic Reset
• RoHS Complaint,
lead-free and halogen
free
• Portable printer and
projector
• Li-Ion battery Powered
Mobile Devices
• USB Connection Ports
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/21/17
PolySwitch
®
Resettable PTCs
Surface Mount > LoRho Series
Electrical Characteristics
Part Number
I
H
(A)
1.75
2.00
2.70
3.50
3.80
4.00
4.50
5.00
5.50
6.00
1.90
2.00
2.50
3.50
3.80
4.00
4.50
5.00
5.50
6.00
I
T
(A)
5.00
9.50
6.30
6.30
8.00
8.00
10.00
10.00
11.00
12.00
4.90
5.00
5.20
9.00
9.00
9.00
9.00
10.00
11.00
12.00
V
MAX
(VDC)
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
5
6
5
6
I
MAX
(A)
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
P
D MAX
(W)
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
Max Time-to-Trip
(A)
9.50
9.50
8.00
8.00
9.50
20.00
25.00
25.00
25.00
25.00
9.50
9.50
9.50
9.50
9.50
9.50
25.00
25.00
25.00
25.00
R
MIN
(^)
0.008
0.006
0.005
0.004
0.004
0.004
0.002
0.002
0.002
0.002
0.006
0.006
0.005
0.0025
0.0025
0.0025
0.002
0.002
0.002
0.002
R
1MAX
(v)
0.034
0.024
0.018
0.018
0.014
0.010
0.008
0.008
0.007
0.007
0.021
0.021
0.018
0.011
0.009
0.0099
0.008
0.007
0.0065
0.0063
(S)
1.00
3.00
5.00
5.00
10.00
2.00
2.00
2.00
2.00
2.00
4.00
4.00
5.00
10.00
10.00
10.00
2.00
2.00
2.00
2.00
Agency
Recognition
UL, CSA, TÜV
UL, CSA
UL, CSA, TÜV
UL, CSA, TÜV
UL
TÜV
UL, TÜV
UL, CSA, TÜV
LR2
UL,TÜV
UL, CSA
UL, CSA
UL, CSA
UL, CSA, TÜV
UL, CSA
UL,TÜV
UL, TÜV
UL
UL, TÜV
nanoSMDLR Series Size 3216mm/1206mils
nanoSMD175LR
nanoSMD200LR
nanoSMD270LR
nanoSMD350LR
nanoSMD380LR
nanoSMD400LR
nanoSMD450LR
nanoSMD500LR-D
nanoSMD550LR
nanoSMD600LR
microSMD190LR
microSMD200LR
microSMD250LR-A
microSMD350LR-D
microSMD380LR
microSMD400LR
microSMD450LR
microSMD500LR
microSMD550LR
microSMD600LR
microSMDLR Series Size 3225mm/1210mils
Temperature Rerating
Ambient Operating Temperature
Part Number
nanoSMD175LR
nanoSMD200LR
nanoSMD270LR
nanoSMD350LR
nanoSMD380LR
nanoSMD400LR
nanoSMD450LR
nanoSMD500LR-D
nanoSMD550LR
nanoSMD600LR
microSMD190LR
microSMD200LR
microSMD250LR-A
microSMD350LR-D
microSMD380LR
microSMD400LR
microSMD450LR
microSMD500LR
microSMD550LR
microSMD600LR
-40°C
3.00
3.60
4.00
5.50
5.75
5.80
6.69
7
.40
7
.96
8.50
3.40
3.50
4.40
5.40
5.71
5.91
7
.00
7
.40
7
.96
8.50
-20°C
2.60
3.20
3.50
4.80
5.15
5.20
6.00
6.60
7
.19
7
.80
2.90
3.00
3.80
4.75
5.04
5.24
6.20
6.60
7
.19
7
.80
0°C
2.20
2.80
3.00
4.00
5.00
4.60
5.40
6.00
6.50
7
.00
2.40
2.50
3.20
4.00
4.00
4.70
5.50
6.00
7
.00
7
.00
20°C
1.75
2.00
2.70
3.50
3.80
4.00
4.50
5.00
5.50
6.00
1.90
2.00
2.50
3.50
3.80
4.00
4.50
5.00
5.50
6.00
25°C
1.70
1.90
2.60
3.30
3.74
3.90
4.40
4.90
5.30
5.72
1.80
1.90
2.40
3.20
3.52
3.72
4.40
4.90
5.46
5.70
40°C
1.40
1.80
2.20
2.70
3.06
3.40
3.80
4.60
4.80
4.94
1.40
1.50
1.90
2.70
3.01
3.21
3.80
4.60
4.88
5.00
50°C
1.20
1.60
2.00
2.30
2.60
3.10
3.50
4.20
4.30
4.42
1.15
1.25
1.50
2.40
2.67
2.87
3.50
4.20
4.49
4.50
60°C
1.00
1.40
1.60
1.90
2.20
2.82
3.30
3.70
3.80
3.90
0.90
1.00
1.25
2.00
2.50
2.50
3.20
3.70
4.10
3.90
70°C
0.80
1.20
1.40
1.60
1.90
2.52
2.75
3.30
3.40
3.50
0.65
0.75
1.00
1.70
2.00
2.20
2.75
3.30
3.50
3.50
80°C
0.60
1.00
1.20
1.40
1.60
2.23
2.35
3.00
3.10
3.20
0.40
0.50
0.65
1.35
1.66
1.86
2.35
3.00
3.20
3.10
85°C
0.50
0.80
1.10
1.30
1.50
2.10
2.16
2.80
2.90
3.00
0.28
0.38
0.50
1.20
1.49
1.69
2.16
2.80
3.00
2.90
nanoSMDLR Series Size 3216mm/1206mils
microSMDLR Series Size 3225mm/1210mils
Note:
The temperature rerating data is for reference only. Please contact Littelfuse technical support for detail temperature rerating information
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/21/17
PolySwitch
®
Resettable PTCs
Surface Mount > LoRho Series
Temperature Derating Curve
Environmental Specifications
Operating Temperature
Maximum Device Surface
Temperature in Tripped State
Passive Aging
Humidity Aging
Thermal Shock
Vibration
Moisture Sensitivity Level
-40°C to +80°C
125°C
+85°C, 1000 hours
-/+10% typical resistance change
+85°C, 85% R.H.,100 hours
-/+15% typical resistance change
MIL–STD–202, Method 215
No change
MIL–STD–883, Method 2007
,
Condition A No change
Level 2a, J–STD–020
Physical Specifications
Terminal Pad Materials
Soldering Characteristics
Solder Heat Withstand
Flammability Resistance
Gold with Nickel Underplate
ANSI/J-STD-002 Category 3
per IEC-STD 68-2-20, Test Tb,
Section 5, Method 1A
per IEC 695-2-2 Needle Flame
Test for 20 sec.
40°C max, 70% R.H. max;
Devices May Not Meet Specified
Ratings if Storage Conditions
Are Exceeded.
Recommended Storage
Conditions
Soldering Parameters
Profile Feature
- Temperature Min (T
s(min)
)
Pre Heat
- Temperature Max (T
s(max)
)
- Time (min to max) (t
s
)
Average ramp up rate (Liquidus Temp
(T
L
) to peak
T
S(max)
to T
L
- Ramp-up Rate
Reflow
- Temperature (T
L
) (Liquidus)
- Temperature (t
L
)
Pb-Free assembly
150°C
200°C
T
P
T
L
T
S(max)
Temperature
Ramp-up
t
P
t
L
Ramp-do
Ramp-down
Preheat
60 – 120 seconds
3°C/second max
3°C/second max
217°C
60 – 150 seconds
260°C
T
S(min)
t
S
time to peak temperature
25
Time
Peak Temperature (T
P
)
Time within 5°C of actual peak
Temperature (t
p
)
Ramp-down Rate
Time 25°C to peak Temperature (T
P
)
Notes:
30 seconds max
2°C/second max
8 minutes max
• All temperature refer to topside of the package, measured on the package body surface.
• If reflow temperature exceeds the recommended profile, devices may not meet the
performance requirements.
• Recommended reflow methods: IR, vapor phase oven, hot air oven, N
2
environment
for lead.
• Recommended maximum paste thickness is 0.25 mm (0.010 inch).
• Devices can be cleaned using standard industry methods and solvents.
• Devices can be reworked using the standard industry practices.
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/21/17
PolySwitch
®
Resettable PTCs
Surface Mount > LoRho Series
Dimensions
Figure LR2
A
B
Figure LR3
A
E
B
Solder Pad Layout
C
C
D
Part Number
A
Min
3.00
(0.118)
3.00
(0.118)
3.00
(0.118)
3.00
(0.118)
3.00
(0.118)
3.00
(0.118)
3.00
(0.118)
3.00
(0.118)
3.00
(0.118)
3.00
(0.118)
3.00
(0.118)
3.00
(0.118)
3.00
(0.118)
3.00
(0.118)
3.00
(0.118)
3.00
(0.118)
3.00
(0.118)
3.00
(0.118)
3.00
(0.118)
3.00
(0.118)
C
B
B
C
Max
1.00
(0.039)
1.00
(0.039)
1.00
(0.039)
1.00
(0.039)
1.00
(0.039)
1.00
(0.039)
0.80
(0.031)
0.80
(0.031)
0.80
(0.031)
1.00
(0.039)
1.00
(0.039)
1.00
(0.039)
1.00
(0.039)
1.00
(0.039)
1.00
(0.039)
1.00
(0.039)
1.00
(0.039)
1.00
(0.039)
1.00
(0.039)
1.00
(0.039)
A
B
D
Max
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)
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)
3.43
(0.135)
3.43
(0.135)
3.43
(0.135)
3.43
(0.135)
3.43
(0.135)
3.43
(0.135)
D
Max
1.85
(0.073)
1.85
(0.073)
1.85
(0.073)
1.85
(0.073)
1.85
(0.073)
1.85
(0.073)
1.85
(0.073)
1.85
(0.073)
1.85
(0.073)
1.85
(0.073)
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)
2.80
(0.110)
2.80
(0.110)
2.80
(0.110)
E
Max
0.75
(0.030)
0.75
(0.030)
0.75
(0.030)
0.75
(0.030)
0.75
(0.030)
0.75
(0.030)
0.75
(0.030)
0.75
(0.030)
0.75
(0.030)
0.75
(0.030)
0.75
(0.030)
0.75
(0.030)
0.75
(0.030)
0.75
(0.030)
0.75
(0.030)
0.75
(0.030)
0.75
(0.030)
0.75
(0.030)
0.75
(0.030)
0.75
(0.030)
Min
0.50
(0.019)
0.50
(0.019)
0.50
(0.019)
0.50
(0.019)
0.50
(0.019)
0.50
(0.019)
0.50
(0.019)
0.50
(0.019)
0.50
(0.019)
0.50
(0.019)
0.50
(0.019)
0.50
(0.019)
0.50
(0.019)
0.50
(0.019)
0.50
(0.019)
0.50
(0.019)
0.50
(0.019)
0.50
(0.019)
0.50
(0.019)
0.50
(0.019)
Min
1.37
(0.054)
1.37
(0.054)
1.37
(0.054)
1.37
(0.054)
1.37
(0.054)
1.37
(0.054)
1.37
(0.054)
1.37
(0.054)
1.37
(0.054)
1.37
(0.054)
2.35
(0.092)
2.35
(0.092)
2.35
(0.092)
2.35
(0.092)
2.35
(0.092)
2.35
(0.092)
2.35
(0.092)
2.35
(0.092)
2.35
(0.092)
2.35
(0.092)
Min
0.25
(0.010)
0.25
(0.010)
0.25
(0.010)
0.25
(0.010)
0.25
(0.010)
0.25
(0.010)
0.25
(0.010)
0.25
(0.010)
0.25
(0.010)
0.25
(0.010)
0.25
(0.010)
0.25
(0.010)
0.25
(0.010)
0.25
(0.010)
0.25
(0.010)
0.25
(0.010)
0.25
(0.010)
0.25
(0.010)
0.25
(0.010)
0.25
(0.010)
Min
Figure
nanoSMDLR Series Size 3216mm/1206mils - Dimension in mm(in)
nanoSMD175LR
nanoSMD200LR
nanoSMD270LR
nanoSMD350LR
nanoSMD380LR
nanoSMD400LR
nanoSMD450LR
nanoSMD500LR-D
nanoSMD550LR
nanoSMD600LR
—
—
—
—
—
—
—
—
—
—
LR2
LR2
LR2
LR2
LR2
LR2
LR2
LR2
LR2
LR2
microSMDLR Series Size 3225mm/1210mils - Dimension in mm(in)
microSMD190LR
microSMD200LR
microSMD250LR-A
microSMD350LR-D
microSMD380LR
microSMD400LR
microSMD450LR
microSMD500LR
microSMD550LR
microSMD600LR
0.076
(0.003)
0.076
(0.003)
0.076
(0.003)
—
—
—
0.076
(0.003)
0.076
(0.003)
0.076
(0.003)
0.076
(0.003)
LR3
LR3
LR3
LR2
LR2
LR2
LR3
LR3
LR3
LR3
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/21/17
PolySwitch
®
Resettable PTCs
Surface Mount > LoRho Series
Packaging and Marking Information
Part
Number
Tape & Reel
Quantity
Standard
Package
Part
Marking
Recommended Pad Layout Figures [mm (in)]
Dimension
A (Nom)
1.75 (0.069)
1.75 (0.069)
1.75 (0.069)
1.75 (0.069)
1.75 (0.069)
1.75 (0.069)
1.75 (0.069)
1.75 (0.069)
1.75 (0.069)
1.75 (0.069)
2.65 (0.104)
2.65 (0.104)
2.65 (0.104)
2.65 (0.104)
2.65 (0.104)
2.65 (0.104)
2.65 (0.104)
2.65 (0.104)
2.65 (0.104)
2.65 (0.104)
Dimension
B (Nom)
1.10 (0.043)
1.10 (0.043)
1.10 (0.043)
1.10 (0.043)
1.10 (0.043)
1.10 (0.043)
1.10 (0.043)
1.10 (0.043)
1.10 (0.043)
1.10 (0.043)
1.00 (0.039)
1.00 (0.039)
1.00 (0.039)
1.10 (0.043)
1.10 (0.043)
1.10 (0.043)
1.00 (0.039)
1.00 (0.039)
1.00 (0.039)
1.10 (0.043)
Dimension
C (Nom)
2.00 (0.079)
2.00 (0.079)
2.00 (0.079)
2.00 (0.079)
2.00 (0.079)
2.00 (0.079)
2.00 (0.079)
2.00 (0.079)
2.00 (0.079)
2.00 (0.079)
2.00 (0.079)
2.00 (0.079)
2.00 (0.079)
2.00 (0.079)
2.00 (0.079)
2.00 (0.079)
2.00 (0.079)
2.00 (0.079)
2.00 (0.079)
2.00 (0.079)
nanoSMDLR Series Size 3216mm/1206mils
nanoSMD175LR
nanoSMD200LR
nanoSMD270LR
nanoSMD350LR
nanoSMD380LR
nanoSMD400LR
nanoSMD450LR
nanoSMD500LR-D
nanoSMD550LR
nanoSMD600LR
microSMD190LR
microSMD200LR
microSMD250LR-A
microSMD350LR-D
microSMD380LR
microSMD400LR
microSMD450LR
microSMD500LR
microSMD550LR
microSMD600LR
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
15,000
15,000
15,000
15,000
15,000
15,000
15,000
15,000
15,000
15,000
15,000
15,000
15,000
15,000
15,000
15,000
15,000
15,000
15,000
15,000
J
T
L
P
P
S
H
H
H
H
NONE
T
L
P
P
P
H H H
V
microSMDLR Series Size 3225mm/1210mils
Part Numbering System
nano SMD 350 LR -2
SIZE
SURFACE MOUNT DEVICE
I
HOLD
CURRENT CODE
LoRho
TAPE/REEL
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/21/17
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