Document
PolySwitch® Resettable PTCs
Surface Mount > LoRho Series
Low Rho SMD Series
Agency Approvals AGENCY
AGENCY FILE NUMBER 078165 * E74889 *
R 72161796 *
* - See Electrical Characteristic Table for approved part numbers.
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
• 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)
• Ultra low internal resistance
• Automatic Reset
• RoHS Complaint, lead-free and halogen free
Applications
• Mobile and smart phones
• Wearable devices • Portable game console • VR/AR head mount
display (HMD) • Tablets and eBook
• 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
IH IT (A) (A)
nanoSMDLR Series Size 3216mm/1206mils
nanoSMD175LR
1.75 5.00
nanoSMD200LR
2.00
9.50
nanoSMD270LR
2.70 6.30
nanoSMD350LR
3.50 6.30
nanoSMD380LR
3.80 8.00
nanoSMD400LR
4.00
8.00
nanoSMD450LR
4.50 10.00
nanoSMD500LR-D
5.00
10.00
nanoSMD550LR
5.50 11.00
nanoSMD600LR
6.00
12.00
microSMDLR Series Size 3225mm/1210mils
microSMD190LR
1.90 4.90
microSMD200LR
2.00
5.00
microSMD250LR-A
2.50 5.20
microSMD350LR-D
3.50 9.00
microSMD380LR
3.80 9.00
microSMD400LR
4.00
9.00
microSMD450LR
4.50 9.00
microSMD500LR
5.00
10.00
microSMD550LR
5.50 11.00
microSMD600LR
6.00
12.00
VMAX (VDC)
IMAX (A)
6 50 6 50 6 50 6 50 6 50 6 50 6 50 6 50 6 50 6 50
6 50 6 50 6 50 6 50 6 50 6 50 5 50 6 50 5 50 6 50
PD MAX (W)
Max Time-to-Trip (A) (S)
1.00 9.50
1.00
1.00 9.50
3.00
1.00 8.00
5.00
1.00 8.00
5.00
1.00 9.50 10.00
1.00 20.00
2.00
1.00 25.00
2.00
1.00 25.00
2.00
1.00 25.00
2.00
1.00 25.00
2.00
1.00 9.50
4.00
1.00 9.50
4.00
1.00 9.50
5.00
1.00 9.50 10.00
1.00 9.50 10.00
1.00 9.50 10.00
1.00 25.00
2.00
1.00 25.00
2.00
1.00 25.00
2.00
1.00 25.00
2.00
RMIN (^)
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
R1MAX (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
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
Temperature Rerating
Ambient OperatingTemperature
Part Number
-40°C -20°C
0°C
20°C
25°C 40°C 50°C 60°C
nanoSMDLR Series Size 3216mm/1206mils
nanoSMD175LR
3.00
2.60
nanoSMD200LR
3.60 3.20
nanoSMD270LR
4.00
3.50
nanoSMD350LR
5.50 4.80
nanoSMD380LR
5.75 5.15
nanoSMD400LR
5.80 5.20
nanoSMD450LR
6.69 6.00
nanoSMD500LR-D
7.40 6.60
nanoSMD550LR
7.96 7.19
nanoSMD600LR
8.50 7.80
microSMDLR Series Size 3225mm/1210mils
microSMD190LR
3.40 2.90
microSMD200LR
3.50 3.00
microSMD250LR-A
4.40 3.80
microSMD350LR-D
5.40 4.75
microSMD380LR
5.71 5.04
microSMD400LR
5.91 5.24
microSMD450LR
7.00 6.20
microSMD500LR
7.40 6.60
microSMD550LR
7.96 7.19
microSMD600LR
8.50 7.80
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
1.75 1.70 1.40 1.20 1.00 2.00 1.90 1.80 1.60 1.40 2.70 2.60 2.20 2.00 1.60 3.50 3.30 2.70 2.30 1.90 3.80 3.74 3.06 2.60 2.20 4.00 3.90 3.40 3.10 2.82 4.50 4.40 3.80 3.50 3.30 5.00 4.90 4.60 4.20 3.70 5.50 5.30 4.80 4.30 3.80 6.00 5.72 4.94 4.42 3.90
1.90 1.80 1.40 1.15 0.90 2.00 1.90 1.50 1.25 1.00 2.50 2.40 1.90 1.50 1.25 3.50 3.20 2.70 2.40 2.00 3.80 3.52 3.01 2.67 2.50 4.00 3.72 3.21 2.87 2.50 4.50 4.40 3.80 3.50 3.20 5.00 4.90 4.60 4.20 3.70 5.50 5.46 4.88 4.49 4.10 6.00 5.70 5.00 4.50 3.90
Note: The temperature rerating data is for reference only. Please contact Littelfuse technical support for detail temperature rerating information
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
© 2017 Littelfuse, Inc. Specifications are subject to change without notice.
Revised: 09/21/.