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 Current ratings from 1.75 Ultra low internal to 6.0A resistance AGENCY AGENCY FILE NUMBER Maximum electrical Automatic Reset 078165 * rating: 6VDC and short RoHS Complaint, circuit current 50A lead-free and halogen E74889 * Halogen free free (Br900ppm, R 72161796 * Cl900ppm, and * - See Electrical Characteristic Table for approved part numbers. Br+Cl1500ppm) Applications Mobile and smart P ortable printer and phones projector Wearable devices Li-Ion battery Powered Mobile Devices Portable game console USB Connection Ports VR/AR head mount display (HMD) Tablets and eBook 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/21/17 PolySwitch Resettable PTCs Surface Mount > LoRho Series Electrical Characteristics I I V I P Max Time-to-Trip R R Agency H T MAX MAX D MAX MIN 1MAX Part Number Recognition (A) (A) (VDC) (A) (W) (A) (S) ( ) (v) nanoSMDLR Series Size 3216mm/1206mils nanoSMD175LR 1.75 5.00 6 50 1.00 9.50 1.00 0.008 0.034 UL, CSA, TV nanoSMD200LR 2.00 9.50 6 50 1.00 9.50 3.00 0.006 0.024 UL, CSA nanoSMD270LR 2.70 6.30 6 50 1.00 8.00 5.00 0.005 0.018 UL, CSA, TV nanoSMD350LR 3.50 6.30 6 50 1.00 8.00 5.00 0.004 0.018 UL, CSA, TV nanoSMD380LR 3.80 8.00 6 50 1.00 9.50 10.00 0.004 0.014 UL nanoSMD400LR 4.00 8.00 6 50 1.00 20.00 2.00 0.004 0.010 TV nanoSMD450LR 4.50 10.00 6 50 1.00 25.00 2.00 0.002 0.008 UL, TV nanoSMD500LR-D 5.00 10.00 6 50 1.00 25.00 2.00 0.002 0.008 UL, CSA, TV nanoSMD550LR 5.50 11.00 6 50 1.00 25.00 2.00 0.002 0.007 LR2 nanoSMD600LR 6.00 12.00 6 50 1.00 25.00 2.00 0.002 0.007 UL,TV microSMDLR Series Size 3225mm/1210mils microSMD190LR 1.90 4.90 6 50 1.00 9.50 4.00 0.006 0.021 UL, CSA microSMD200LR 2.00 5.00 6 50 1.00 9.50 4.00 0.006 0.021 UL, CSA microSMD250LR-A 2.50 5.20 6 50 1.00 9.50 5.00 0.005 0.018 UL, CSA microSMD350LR-D 3.50 9.00 6 50 1.00 9.50 10.00 0.0025 0.011 UL, CSA, TV microSMD380LR 3.80 9.00 6 50 1.00 9.50 10.00 0.0025 0.009 UL, CSA microSMD400LR 4.00 9.00 6 50 1.00 9.50 10.00 0.0025 0.0099 UL,TV microSMD450LR 4.50 9.00 5 50 1.00 25.00 2.00 0.002 0.008 UL, TV microSMD500LR 5.00 10.00 6 50 1.00 25.00 2.00 0.002 0.007 UL microSMD550LR 5.50 11.00 5 50 1.00 25.00 2.00 0.002 0.0065 microSMD600LR 6.00 12.00 6 50 1.00 25.00 2.00 0.002 0.0063 UL, TV Temperature Rerating Ambient Operating Temperature Part Number -40C -20C 0C 20C 25C 40C 50C 60C 70C 80C 85C nanoSMDLR Series Size 3216mm/1206mils nanoSMD175LR 3.00 2.60 2.20 1.75 1.70 1.40 1.20 1.00 0.80 0.60 0.50 nanoSMD200LR 3.60 3.20 2.80 2.00 1.90 1.80 1.60 1.40 1.20 1.00 0.80 nanoSMD270LR 4.00 3.50 3.00 2.70 2.60 2.20 2.00 1.60 1.40 1.20 1.10 nanoSMD350LR 5.50 4.80 4.00 3.50 3.30 2.70 2.30 1.90 1.60 1.40 1.30 nanoSMD380LR 5.75 5.15 5.00 3.80 3.74 3.06 2.60 2.20 1.90 1.60 1.50 nanoSMD400LR 5.80 5.20 4.60 4.00 3.90 3.40 3.10 2.82 2.52 2.23 2.10 nanoSMD450LR 6.69 6.00 5.40 4.50 4.40 3.80 3.50 3.30 2.75 2.35 2.16 nanoSMD500LR-D 7.40 6.60 6.00 5.00 4.90 4.60 4.20 3.70 3.30 3.00 2.80 nanoSMD550LR 7.96 7.19 6.50 5.50 5.30 4.80 4.30 3.80 3.40 3.10 2.90 nanoSMD600LR 8.50 7.80 7.00 6.00 5.72 4.94 4.42 3.90 3.50 3.20 3.00 microSMDLR Series Size 3225mm/1210mils microSMD190LR 3.40 2.90 2.40 1.90 1.80 1.40 1.15 0.90 0.65 0.40 0.28 microSMD200LR 3.50 3.00 2.50 2.00 1.90 1.50 1.25 1.00 0.75 0.50 0.38 microSMD250LR-A 4.40 3.80 3.20 2.50 2.40 1.90 1.50 1.25 1.00 0.65 0.50 microSMD350LR-D 5.40 4.75 4.00 3.50 3.20 2.70 2.40 2.00 1.70 1.35 1.20 microSMD380LR 5.71 5.04 4.00 3.80 3.52 3.01 2.67 2.50 2.00 1.66 1.49 microSMD400LR 5.91 5.24 4.70 4.00 3.72 3.21 2.87 2.50 2.20 1.86 1.69 microSMD450LR 7.00 6.20 5.50 4.50 4.40 3.80 3.50 3.20 2.75 2.35 2.16 microSMD500LR 7.40 6.60 6.00 5.00 4.90 4.60 4.20 3.70 3.30 3.00 2.80 microSMD550LR 7.96 7.19 7.00 5.50 5.46 4.88 4.49 4.10 3.50 3.20 3.00 microSMD600LR 8.50 7.80 7.00 6.00 5.70 5.00 4.50 3.90 3.50 3.10 2.90 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