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POLYSWITCH® Resettable PTCs
Surface Mount > LoRho Series
LoRho SMD PTC for Charging Cable Protection
Description
The Littelfuse LoRho SMD PTC for Charging Cables
provides protection from heat generated due to faults
within the connector such as USB-C, microUSB, and
many others.
As connectors get smaller, their pin-to-pin spacings are
shrinking which increases the opportunity for debris such
as dust, dirt, or water to collect causing a fault. These
faults can generate heat which may damage charging
cables, the devices they charge, or the people using them.
Agency Approvals
AGENCY
AGENCY FILE NUMBER
AMPERE RANGE
E74889*
4.5A
J 50313999*
4.5A
* See Electrical Characteristic Table for approved part numbers.
Applications
• Over temperature (OT)
protection for USB
connectors and cables
including:
– USB Type-C
– USB Micro-B
– USB-A
• Fast charging standards
and protocols including:
– USB Power Delivery (PD)
– Qualcomm Quick
Charge (QC)
– Mediatek Pump
Express (PE)
– Samsung Adaptive
Fast Charging (AFC)
– Huawei/HiSilicon Fast
Charging Protocol (FCP)
These charging protocols are the property of their respective owners.
Features
• SMD compatible with
reflow soldering process
• Available in small 1206
and 1210 sizes
• Up to 21Vdc and
4.5A Ihold
Benefits
• Surface mount design
reduces assembly time
and cost compared to
leaded/strapped models
• Saves PCB space in the
USB-C connector and
ensures that the USB-C
plug meets USB-IF
dimension specifications
• Ultra low internal
resistance
• Reset automatically
• Halogen-free, lead-free
and RoHS compliant
• Well-suited for fast-
charging applications up
to 21Vdc and 4.5A Ihold
Electrical Characteristics
Part Number
Marking
I1
hold
(A)
nanoSMD350LR-C
P 3.50
nanoSMD400LR-C
S 4.00
microSMD450LR-C S 4.50
400CC1206LR-C
Y 4.00
450CC1210LR-C
K 4.50
V2
max
(Vdc)
12
12
12
21
21
Thermal Cut Off
(TCO) - ºC @ 2A
Min Max
Thermal Cut Off
(TCO) - ºC @ 3A
Min Max
Pd3 typ.
(W)
75 100 60 85 1.0
85 110 70 95 1.0
90 115 75 100 1.0
85 110 70 95 1.0
90 115 75 100 1.3
Resistance
R4
min
(Ω)
0.004
0.004
0.002
0.004
0.002
R5
1max
(Ω)
0.018
0.010
0.0085
0.010
0.008
Agency
Approvals
-- --
-- --
XX
-- --
-- --
Notes:
1. Ihold = Hold current: maximum current device will pass without tripping in 20°C still air
2. Vmax = Maximum voltage device can withstand without damage at rated current (Imax)
3. Pd = Power dissipated from device when in the tripped state at 20°C still air
4. Rmin = Minimum resistance of device in initial (un-soldered) state
5. R1max = Maximum resistance of device at 20°C measured one hour after tripping or
reflow Soldering of 260°C for 20 seconds
(Values specified were determined using PCBs with 0.115in x 1.0in ounce copper traces)
Caution: Operation beyond the specified rating may result in damage and possible arcing
and flame
TCO and Pd Testing Method:
Thermal Cut-Off Test–
1. Put the device into the thermostatic chamber controlled at room temperature or 25°C.
2. Apply the specified current to the device, and increase the chamber temperature at the
rate of 2°C per minute.
3. Measure the device ambient temperature when the applied current has reduced to less
than 20% of initial value.
Power Dissipation–
1. Conduct thermal cut-off test at rated current/voltage.
2. After device trip, decrease the chamber temperature with keeping trip state.
3. Measure the tripped-state power dissipation when the device ambient temperature has
reduced to 30°C or less.
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/15/19

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POLYSWITCH® Resettable PTCs
Surface Mount > LoRho Series
Temperature Rerating
Ambient OperatingTemperature
-20°C
0°C
20°C
60°C
Part Number
Hold Current (A)
nanoSMD350LR-C
4.80 4.00 3.50 1.90
nanoSMD400LR-C
5.20 4.60 4.00 2.82
microSMD450LR-C
6.20 5.50 4.50 3.30
400CC1206LR-C
5.20 4.60 4.00 2.82
450CC1210LR-C
6.20 5.50 4.50 3.30
Note: The temperature rerating data is for reference only. Please contact Littelfuse technical support for detail temperature rerating information.
85°C
1.30
2.10
2.30
2.10
2.30
Temperature Derating Curve
Environmental Specifications
Operating Temperature
-20°C to +85°C
Maximum Device Surface
Temperature in Tripped State
125°C
Passive Aging
Humidity Aging
Thermal Shock
+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
Vibration
Moisture Sensitivity Level
MIL–STD–883, Method 2007,
Condition A No change
Level 2a, J–STD–020
Physical Specifications
Terminal
Materials
Lead
Solderability
Solder-Plated Copper
(Solder Material: Matte Tin (Sn))
Meets EIA Specification RS186-9E, ANSI/J-
STD-002, Category 3
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/15/19

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POLYSWITCH® Resettable PTCs
Surface Mount > LoRho Series
Soldering Parameters
Profile Feature
Pb – Free assembly
- Temperature Min (Ts(min))
Pre Heat - Temperature Max (Ts(max))
- Time (min to max) (ts)
Average ramp up rate (LiquidusTemp
(TL) to peak
TS(max) to TL - Ramp-up Rate
Reflow
-Temperature (TL) (Liquidus)
- Temperature (tL)
Peak Temperature (TP)
Time within 5°C of actual peak
Temperature (tp)
Ramp-down Rate
Time 25°C to peakTemperature (TP)
150°C
200°C
60 – 120 seconds
3°C/second max
3°C/second max
217°C
60 – 150 seconds
260°C
30 seconds max
2°C/second max
8 minutes max
TP
TL
TS(max)
Ramp-up
TS(min)
Preheat
tS
25
time to peak temperature
tP
tL
Ramp-down
Time
Notes:
• 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, N2 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.
Dimensions
nanoSMD350LR-C
nanoSMD400LR-C
400CC1206LR-C
AB
microSMD450LR-C
450CC1210LR-C
A
E
B
Solder Pad Layout
PC
C
GH
DD
Marking code varies by device.
See Electrical Characteristics table.
FF
Device Dimension
Solder Pad
Part Number
A B C D E FGH
inch mm inch mm inch mm inch mm inch mm
inch mm inch mm inch mm
Min Max Min Max Min Max Min Max Min Max Min Max Min Max Min Max Min Max Min Max
nanoSMD350LR-C 0.12 0.13 3.00 3.43 0.02 0.03 0.60 0.80 0.05 0.07 1.37 1.85 0.01 0.03 0.25 0.75 -- -- -- -- 0.04 1.10 0.08 2.00 0.07 1.75
nanoSMD400LR-C 0.12 0.13 3.00 3.43 0.02 0.03 0.60 0.80 0.05 0.07 1.37 1.85 0.01 0.03 0.25 0.75 -- -- -- -- 0.04 1.10 0.08 2.00 0.07 1.75
microSMD450LR-C 0.12 0.13 3.00 3.43 0.02 0.03 0.60 0.80 0.09 0.11 2.35 2.80 0.01 0.03 0.25 0.75 0.003 -- 0.076 -- 0.04 1.00 0.08 2.00 0.10 2.65
400CC1206LR-C
0.12 0.13 3.00 3.43 0.02 0.03 0.50 0.80 0.05 0.07 1.37 1.85 0.01 0.03 0.25 0.75 -- -- -- -- 0.04 1.00 0.08 2.00 0.10 2.65
450CC1210LR-C
0.12 0.13 3.00 3.43 0.02 0.03 0.50 0.80 0.09 0.11 2.35 2.80 0.01 0.03 0.25 0.75 0.003 -- 0.076 -- 0.04 1.00 0.08 2.00 0.10 2.65
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/15/19

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POLYSWITCH® Resettable PTCs
Surface Mount > LoRho Series
Packaging
Part Number
nanoSMD350LR-C
nanoSMD400LR-C
microSMD450LR-C
400CC1206LR-C
450CC1210LR-C
Ordering
RF4610-000
RF4611-000
RF2515-000
RF4798-000
RF4800-000
IHOLD (A)
3.50
4.00
4.50
4.00
4.50
IHOLD Code
350
400
450
400
450
Packaging Option
Tape and Reel
Quantity
15,000
15,000
15,000
15,000
15,000
Part Numbering System
nano SMD 350 LR-C -2
400 CC 1206 LR-C -2
SIZE
SURFACE MOUNT DEVICE
IHOLD CURRENT CODE
LoRho
FOR CHARGING
CABLE APPLICATION
TAPE/REEL
Ihold CURRENT CODE
TYPE C TO TYPE C
SIZE
LoRho
FOR CHARGING
CABLE APPLICATION
TAPE/REEL
Installation and Handling Guidelines
• Operation of these devices beyond the stated maximum
ratings could result in damage to the devices and lead to
electrical arcing and/or fire.
• These devices are intended to protect against the effects
of temporary over-current or over-temperature conditions
and are not intended to perform as protective devices
where such conditions are expected to be repetitive or
prolonged in duration.
• Exposure to silicon-based oils, solvents, electrolytes,
acids, and similar materials can adversely affect the
performance of these PPTC devices.
• These devices undergo thermal expansion under fault
conditions, and thus shall be provided with adequate
space and be protected against mechanical stresses.
• Circuits with inductance may generate a voltage (L di/dt)
above the rated voltage of the PPTC device.
• Hand-soldering of PTC devices on boards is generally not
recommended. Users shall define and verify this process
if needed.
• Consult Littelfuse when the device is to be applied
with thermal processes other than reflow process on
the circuit board, such as molding, encapsulation. User
should evaluate molding materials used in the charging
cable applications to ensure there are no adverse effect
on the PTC devices.
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/15/19

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POLYSWITCH® Resettable PTCs
Surface Mount > LoRho Series
Tape and Reel Specifications
T
Cover Tape
B1 K0
P0
D0 P2
A0
B0
Embossment
E1
FW
E2
T1 P1
Center lines
of Cavity
Cover Tape
A
W2 (Measured at Hub)
N (hub dia.)
Carrier Tape
W
P0
P1
P2
A0
B0
B1 max.
D0
F
E1
E2 min.
T max.
T1 max.
K0
A max.
N min.
W1
W2 max.
nanoSMD350LR-C
nanoSMD400LR-C
8.0 ± 0.30
4.0 ± 0.10
4.0 ± 0.10
2.0 ± 0.05
1.95 ± 0.10
3.50 + 0.1/-0.08
4.35
1.55 ± 0.05
3.50 ± 0.05
1.75 ± 0.10
6.25
0.3
0.1
0.89 ± 0.10
179
53.5
9.5 ± 0.5
15
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/15/19
Embossed Cavity
microSMD450LR-C
8.0 ± 0.30
4.0 ± 0.10
4.0 ± 0.10
2.0 ± 0.05
2.9 ± 0.10
3.55 ± 0.10
4.35
1.55 ± 0.05
3.50 ± 0.05
1.75 ± 0.10
6.25
0.3
0.1
1.27 ± 0.10
179
53.5
9.5 ± 0.5
15
W1 (Measured at Hub)
Standard Pack Quantity: 3,000 pcs
Minimum Order Quantity: 15,000 pcs
Disclaimer 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 may not be used in, all applications. Read complete
Disclaimer Notice at www.littelfuse.com/disclaimer-electronics.