SRF1812P300LR
Surface-Mount Devices | 1812 Size
PTC Resettable Fuses
Features
- Resettable over current and over temperature protection Standard 0402mils footprint
- Fast time-to-trip
- RoHS complaint
- Low resistance
Applications
- USB peripherals including new USB 3.0 / 2.0 ports
- Li-ion / Li-Polymer battery packs
- Smart phones
- Tablet and Notebook PCs
- E-readers
- LCD / LED HDTV Tablet
- Computer peripherals
- Digital cameras and video cameras
- Hard disk drives
- Game consoles
Electrical Characteristics
| Part Number | IH (A) |
IT (A) |
Vmax (V) |
Imax (A) |
Time to Trip | Pdtyp (W) |
Rmin (Ω) |
R1max (Ω) |
|
|---|---|---|---|---|---|---|---|---|---|
| (A) | (Sec.) | ||||||||
| SRF1812P200LR | 2.00 | 5.00 | 6 | 50 | 8.00 | 5.00 | 1.50 | 0.004 | 0.024 |
| SRF1812P200/12LR | 2.00 | 5.00 | 12 | 50 | 8.00 | 5.00 | 1.50 | 0.004 | 0.024 |
| SRF1812P250R | 2.50 | 6.00 | 6 | 50 | 8.00 | 5.00 | 1.50 | 0.003 | 0.020 |
| SRF1812P300LR | 3.00 | 6.00 | 6 | 50 | 15.00 | 5.00 | 1.50 | 0.004 | 0.025 |
| SRF1812P300/12LR | 3.00 | 6.00 | 12 | 50 | 15.00 | 5.00 | 1.50 | 0.004 | 0.025 |
| SRF1812P350LR | 3.50 | 7.00 | 6 | 50 | 17.50 | 5.00 | 1.50 | 0.003 | 0.020 |
| SRF1812P350/12LR | 3.50 | 7.00 | 12 | 50 | 17.50 | 5.00 | 1.50 | 0.003 | 0.020 |
| SRF1812P400LR | 4.00 | 8.00 | 6 | 50 | 20.00 | 5.00 | 1.50 | 0.002 | 0.013 |
| SRF1812P400/12LR | 4.00 | 8.00 | 12 | 50 | 20.00 | 5.00 | 1.50 | 0.004 | 0.014 |
| SRF1812P400/16LR | 4.00 | 8.00 | 16 | 50 | 20.00 | 5.00 | 1.50 | 0.002 | 0.014 |
| SRF1812P450LR | 4.50 | 9.00 | 6 | 50 | 22.50 | 5.00 | 1.50 | 0.002 | 0.013 |
| SRF1812P450/12LR | 4.50 | 9.00 | 12 | 50 | 22.50 | 5.00 | 1.50 | 0.002 | 0.013 |
| SRF1812P450/24LR | 4.50 | 9.00 | 24 | 50 | 22.50 | 5.00 | 1.50 | 0.002 | 0.013 |
| SRF1812P500LR | 5.00 | 10.00 | 6 | 50 | 30.00 | 5.00 | 1.50 | 0.002 | 0.012 |
| SRF1812P500/12LR | 5.00 | 10.00 | 12 | 50 | 30.00 | 5.00 | 1.50 | 0.001 | 0.013 |
| SRF1812P500/16LR | 5.00 | 10.00 | 16 | 50 | 30.00 | 5.00 | 1.50 | 0.001 | 0.013 |
| SRF1812P500/24LR | 5.00 | 10.00 | 24 | 50 | 30.00 | 5.00 | 1.50 | 0.001 | 0.013 |
| SRF1812P700LR | 7.00 | 14.00 | 6 | 50 | 35.00 | 5.00 | 1.50 | 0.0007 | 0.010 |
| SRF1812P700/24LR | 7.00 | 14.00 | 24 | 50 | 35.00 | 5.00 | 1.50 | 0.0007 | 0.010 |
| SRF1812P750LR | 7.50 | 15.00 | 6/8 | 50 | 37.50 | 5.00 | 1.50 | 0.0005 | 0.008 |
| SRF1812P750/12LR | 7.50 | 15.00 | 12 | 50 | 37.50 | 5.00 | 1.50 | 0.0005 | 0.008 |
| SRF1812P800LR | 8.00 | 16.00 | 6 | 50 | 40.00 | 5.00 | 1.50 | 0.0005 | 0.008 |
| SRF1812P900/12LR | 9.00 | 18.00 | 12 | 50 | 40.00 | 5.00 | 1.50 | 0.0005 | 0.007 |
IH=Hold current: maximum current at which the device will not trip at 25℃ still air.
IT=Trip current: minimum current at which the device will always trip at 25℃ still air.
Vmax=Maximum continuous voltage device can withstand without damage at rated current
Imax=Maximum fault current device can withstand without damage at rated voltage.
Ttrip=Maximum time to trip(s) at assigned current.
Pdtyp=Typical power dissipation: typical amount of power dissipated by the device when in state air environment.
Rmin=Minimum resistance of device in initial (un-soldered) state.
R1max=Maximum resistance of device at 25℃ measured one hour after reflow.
Noted: All electrical function test is conducted after PCB mounted.
Thermal Derating Chart
Hold Current (A)
| Part Number | IH (A) |
IT (A) |
Vmax (V) |
Imax (A) |
Time to Trip | Pdtyp (W) |
Rmin (Ω) |
R1max (Ω) |
|
|---|---|---|---|---|---|---|---|---|---|
| (A) | (Sec.) | ||||||||
| SRF1812P200LR | 2.00 | 5.00 | 6 | 50 | 8.00 | 5.00 | 1.50 | 0.004 | 0.024 |
| SRF1812P200/12LR | 2.00 | 5.00 | 12 | 50 | 8.00 | 5.00 | 1.50 | 0.004 | 0.024 |
| SRF1812P250R | 2.50 | 6.00 | 6 | 50 | 8.00 | 5.00 | 1.50 | 0.003 | 0.020 |
| SRF1812P300LR | 3.00 | 6.00 | 6 | 50 | 15.00 | 5.00 | 1.50 | 0.004 | 0.025 |
| SRF1812P300/12LR | 3.00 | 6.00 | 12 | 50 | 15.00 | 5.00 | 1.50 | 0.004 | 0.025 |
| SRF1812P350LR | 3.50 | 7.00 | 6 | 50 | 17.50 | 5.00 | 1.50 | 0.003 | 0.020 |
| SRF1812P350/12LR | 3.50 | 7.00 | 12 | 50 | 17.50 | 5.00 | 1.50 | 0.003 | 0.020 |
| SRF1812P400LR | 4.00 | 8.00 | 6 | 50 | 20.00 | 5.00 | 1.50 | 0.002 | 0.013 |
| SRF1812P400/12LR | 4.00 | 8.00 | 12 | 50 | 20.00 | 5.00 | 1.50 | 0.004 | 0.014 |
| SRF1812P400/16LR | 4.00 | 8.00 | 16 | 50 | 20.00 | 5.00 | 1.50 | 0.002 | 0.014 |
| SRF1812P450LR | 4.50 | 9.00 | 6 | 50 | 22.50 | 5.00 | 1.50 | 0.002 | 0.013 |
| SRF1812P450/12LR | 4.50 | 9.00 | 12 | 50 | 22.50 | 5.00 | 1.50 | 0.002 | 0.013 |
| SRF1812P450/24LR | 4.50 | 9.00 | 24 | 50 | 22.50 | 5.00 | 1.50 | 0.002 | 0.013 |
| SRF1812P500LR | 5.00 | 10.00 | 6 | 50 | 30.00 | 5.00 | 1.50 | 0.002 | 0.012 |
| SRF1812P500/12LR | 5.00 | 10.00 | 12 | 50 | 30.00 | 5.00 | 1.50 | 0.001 | 0.013 |
| SRF1812P500/16LR | 5.00 | 10.00 | 16 | 50 | 30.00 | 5.00 | 1.50 | 0.001 | 0.013 |
| SRF1812P500/24LR | 5.00 | 10.00 | 24 | 50 | 30.00 | 5.00 | 1.50 | 0.001 | 0.013 |
| SRF1812P700LR | 7.00 | 14.00 | 6 | 50 | 35.00 | 5.00 | 1.50 | 0.0007 | 0.010 |
| SRF1812P700/24LR | 7.00 | 14.00 | 24 | 50 | 35.00 | 5.00 | 1.50 | 0.0007 | 0.010 |
| SRF1812P750LR | 7.50 | 15.00 | 6/8 | 50 | 37.50 | 5.00 | 1.50 | 0.0005 | 0.008 |
| SRF1812P750/12LR | 7.50 | 15.00 | 12 | 50 | 37.50 | 5.00 | 1.50 | 0.0005 | 0.008 |
| SRF1812P750/12LR | 8.00 | 16.00 | 6 | 50 | 40.00 | 5.00 | 1.50 | 0.0005 | 0.008 |
| SRF1812P900/12LR | 9.00 | 18.00 | 12 | 50 | 45.00 | 5.00 | 1.50 | 0.0005 | 0.008 |
IH=Hold current: maximum current at which the device will not trip at 25℃ still air.
IT=Trip current: minimum current at which the device will always trip at 25℃ still air.
Vmax=Maximum continuous voltage device can withstand without damage at rated current
Imax=Maximum fault current device can withstand without damage at rated voltage.
Ttrip=Maximum time to trip(s) at assigned current.
Pdtyp=Typical power dissipation: typical amount of power dissipated by the device when in state air environment.
Rmin=Minimum resistance of device in initial (un-soldered) state.
R1max=Maximum resistance of device at 25℃ measured one hour after reflow.
Noted: All electrical function test is conducted after PCB mounted.
Thermal Derating Chart
Hold Current (A)
| Part Number | Ambient Operating Temperature | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| -40°C | -20°C | 0°C | 25°C | 40°C | 50°C | 60°C | 70°C | 85°C | |
| SRF1812P200LR | 3.00 | 2.65 | 2.30 | 2.00 | 1.70 | 1.45 | 1.27 | 1.10 | 0.88 |
| SRF1812P200/12LR | 3.00 | 2.65 | 2.30 | 2.00 | 1.70 | 1.45 | 1.27 | 1.10 | 0.88 |
| SRF1812P250LR | 3.63 | 3.31 | 2.88 | 2.50 | 2.13 | 1.80 | 1.59 | 1.38 | 1.11 |
| SRF1812P300LR | 4.38 | 3.85 | 3.51 | 3.00 | 2.62 | 2.31 | 2.08 | 1.82 | 1.54 |
| SRF1812P300/12LR | 4.38 | 3.85 | 3.51 | 3.00 | 2.62 | 2.31 | 2.08 | 1.82 | 1.54 |
| SRF1812P350LR | 4.85 | 4.38 | 3.85 | 3.50 | 3.00 | 2.62 | 2.31 | 2.08 | 1.75 |
| SRF1812P350/12LR | 4.85 | 4.38 | 3.85 | 3.50 | 3.00 | 2.62 | 2.31 | 2.08 | 1.75 |
| SRF1812P400LR | 5.90 | 5.30 | 4.63 | 4.00 | 3.50 | 3.13 | 2.85 | 2.45 | 1.93 |
| SRF1812P400/12LR | 5.90 | 5.30 | 4.63 | 4.00 | 3.50 | 3.13 | 2.85 | 2.45 | 1.93 |
| SRF1812P400/16LR | 5.90 | 5.30 | 4.63 | 4.00 | 3.50 | 3.13 | 2.85 | 2.45 | 1.93 |
| SRF1812P450LR | 6.62 | 5.99 | 5.22 | 4.50 | 3.96 | 3.51 | 3.15 | 2.75 | 2.16 |
| SRF1812P450/12LR | 6.62 | 5.99 | 5.22 | 4.50 | 3.96 | 3.51 | 3.15 | 2.75 | 2.16 |
| SRF1812P450/24LR | 6.62 | 5.99 | 5.22 | 4.50 | 3.96 | 3.51 | 3.15 | 2.75 | 2.16 |
| SRF1812P500LR | 7.39 | 6.65 | 5.81 | 5.00 | 4.30 | 3.84 | 3.43 | 2.93 | 2.24 |
| SRF1812P500/12LR | 7.39 | 6.65 | 5.81 | 5.00 | 4.30 | 3.84 | 3.43 | 2.93 | 2.24 |
| SRF1812P500/16LR | 7.39 | 6.65 | 5.81 | 5.00 | 4.30 | 3.84 | 3.43 | 2.93 | 2.24 |
| SRF1812P500/24LR | 7.39 | 6.65 | 5.81 | 5.00 | 4.30 | 3.84 | 3.43 | 2.93 | 2.24 |
| SRF1812P700LR | 10.20 | 9.26 | 8.05 | 7.00 | 5.95 | 5.06 | 4.45 | 3.87 | 3.10 |
| SRF1812P700/24LR | 10.20 | 9.26 | 8.05 | 7.00 | 5.95 | 5.06 | 4.45 | 3.87 | 3.10 |
| SRF1812P750LR | 11.02 | 9.55 | 8.36 | 7.50 | 6.60 | 5.92 | 5.40 | 5.00 | 3.90 |
| SRF1812P750/12LR | 11.02 | 9.55 | 8.36 | 7.50 | 6.60 | 5.92 | 5.40 | 5.00 | 3.90 |
| SRF1812P800LR | 11.02 | 9.55 | 8.36 | 8.00 | 6.60 | 5.92 | 5.40 | 5.00 | 3.90 |
| SRF1812P900/12LR | 11.30 | 10.50 | 9.50 | 9.00 | 7.60 | 6.30 | 5.10 | 4.00 | 3.00 |
Notes: The temperature rerating data is for reference only. Please contact PROSEMI technical support for detail temperature rerating information.
Dimensions (mm)
Recommended Pad Layout (mm)
| Part Number | Marking | A | B | C | D | |||
|---|---|---|---|---|---|---|---|---|
| Min. | Max. | Min. | Max. | Min. | Max. | Min. | ||
| SRF1812P200LR | T200 | 4.37 | 4.73 | 3.07 | 3.41 | 0.40 | 0.80 | 0.30 |
| SRF1812P200/12LR | T200 | 4.37 | 4.73 | 3.07 | 3.41 | 0.40 | 0.80 | 0.30 |
| SRF1812P250LR | T250 | 4.37 | 4.73 | 3.07 | 3.41 | 0.40 | 0.80 | 0.30 |
| SRF1812P300LR | T300 | 4.37 | 4.73 | 3.07 | 3.41 | 0.40 | 0.80 | 0.30 |
| SRF1812P300/12LR | T300 | 4.37 | 4.73 | 3.07 | 3.41 | 0.40 | 0.80 | 0.30 |
| SRF1812P350LR | T350 | 4.37 | 4.73 | 3.07 | 3.41 | 0.40 | 0.80 | 0.30 |
| SRF1812P350/12R | T350 | 4.37 | 4.73 | 3.07 | 3.41 | 0.40 | 0.80 | 0.30 |
| SRF1812P400LR | T400 | 4.37 | 4.73 | 3.07 | 3.41 | 0.40 | 0.80 | 0.30 |
| SRF1812P400/12R | T400 | 4.37 | 4.73 | 3.07 | 3.41 | 0.40 | 0.80 | 0.30 |
| SRF1812P400/16LR | T400 | 4.37 | 4.73 | 3.07 | 3.41 | 0.40 | 0.80 | 0.30 |
| SRF1812P450LR | T450 | 4.37 | 4.73 | 3.07 | 3.41 | 0.40 | 0.80 | 0.30 |
| SRF1812P450/12LR | T450 | 4.37 | 4.73 | 3.07 | 3.41 | 0.40 | 0.80 | 0.30 |
| SRF1812P450/24LR | T450 | 4.37 | 4.73 | 3.07 | 3.41 | 0.40 | 0.80 | 0.30 |
| SRF1812P500LR | T500 | 4.37 | 4.73 | 3.07 | 3.41 | 0.40 | 0.80 | 0.30 |
| SRF1812P500/12LR | T500 | 4.37 | 4.73 | 3.07 | 3.41 | 0.35 | 0.85 | 0.30 |
| SRF1812P500/16LR | T500 | 4.37 | 4.73 | 3.07 | 3.41 | 0.60 | 1.00 | 0.30 |
| SRF1812P500/24LR | T500 | 4.37 | 4.73 | 3.07 | 3.41 | 0.40 | 0.80 | 0.30 |
| SRF1812P700LR | T700 | 4.37 | 4.73 | 3.07 | 3.41 | 0.40 | 0.80 | 0.30 |
| SRF1812P700/24LR | T700 | 4.37 | 4.73 | 3.07 | 3.41 | 0.40 | 0.80 | 0.30 |
| SRF1812P750LR | T750 | 4.37 | 4.73 | 3.07 | 3.41 | 0.40 | 0.80 | 0.30 |
| SRF1812P750/12LR | T750 | 4.37 | 4.73 | 3.07 | 3.41 | 1.00 | 1.45 | 0.30 |
| SRF1812P800LR | T800 | 4.37 | 4.73 | 3.07 | 3.41 | 0.40 | 0.80 | 0.30 |
| SRF1812P900/12LR | T900 | 4.37 | 4.73 | 3.07 | 3.41 | 0.40 | 0.80 | 0.30 |
Solder Reflow Conditions
| Reflow Profile | Lead free |
|---|---|
| Heating rate from Tsmax to Tp | Max. 3℃/second |
| Pre-heat: Tsmin Tsmax Tsmin to Tsmax |
150℃ 200℃ 60~180 seconds |
| Soldering time: Temperature (TL) Time (tL) |
>217℃ 60~150 seconds |
| Peak temperature (Tp) | 260℃ |
| Time at Peak temperature ±5℃ (tp) | 20~40 seconds |
| Cooling rate | Max. 6℃/second |
| Time from 25℃ to Peak Temperature | 8 minutes max |
Cautions for Reflow：
1. Recommended reflow methods: IR, hot air oven, nitrogen oven;
2. The printed solder thickness is not over 0.25mm，Excess solder may cause a short circuit, especially during hand soldering;
3. If reflow temperatures exceed the recommended profile, devices may not meet the performance requirements;
4. Device can not be wave soldered. Please contact Prosemi for hand soldering and dip soldering recommendations;
5. Device can’t contact solvent;
Note：All temperature in top chart is measured on the surface of devices.
Packaging Options
| I hold(A) | Quantity |
|---|---|
| 2.00A~5.00A | 2,000pcs |
| 7.00A~9.00A | 1,500pcs |
Reel packaging per EIA-481-1 standard