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Home » Product Knowledge Center » Littelfuse Lo Rho Polyfuse PPTC Resettable PTC Fuses
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Littelfuse Lo Rho Polyfuse
PPTC Resettable PTC Fuses

The Littelfuse Lo Rho Surface Mount Polyfuse PPTC (Polymer Positive Temperature Coefficient) Resettable PTC Fuses provide ultra-low normal operating resistance at normal operating hold current. Featuring a compact design, the Littelfuse Lo Rho Polyfuse PPTC Resettable PTC Fuses offer a maximum fault current rating of 40A, and are compatible with high temperature solders.

Features
  • Lo Rho (low resistance at normal operating hold current)
  • Fast response to fault currents
  • Automatically Resettable
  • Compact design saves board space
  • Thin profile: < 0.75mm
  • RoHS compliant, Lead-free, Halogen-free, TUV & UL certified
  • Compatible with high temperature solders
Applications
  • USB peripherals
  • Disk drives
  • CD-ROMs
  • PDAs
  • Digital cameras
  • Plug and play protection for motherboards and peripherals
  • Game console port protection
Part Number
Marking
Ihold (A)
I trip (A)
V max (Vdc)
I max
(A)
P d typ.
(W)
Maximum Time-To-Trip
Resistance
Agency Approvals
Current
(A) 		Time
(Sec.) 		R min
(Ω) 		R 1max
(Ω) 		UL
TUV
0805L075SLYR
-G 0.75 1.506
 50 0.6 8 0.2 0.040 0.160 x x
1206L150SLYR
-K 1.50 3.06 50 0.8 8 0.3 0.010 0.065 x x
1206L300SLWR -N 3 6 6 50 0.8 8 4 0.003 0.02 x x
1206L350SLWR -T 3.5 7 6 50 0.8 8 5 0.003 0.018 x x
1206L380SLWR X 3.7 8 6 50 0.8 8 5 0.002 0.016 x x
1210L200SLYR
-L 2 4 6 50 0.8 8 30.005 0.024 x x
1210L350SLWR -T 3.5 7 6 50 0.8 17.5 2 0.003 0.018 x x
1210L380SLYR X 3.8 8 6 50 1 8 5 0.002 0.016 x x
1812L190SLPR LF 19
 1.90 4.90 6 50 1 9.50 4.50.003
 0.025 x x
1812L350SLPR* LF-35 3.5 8.1 6 50 1 17.5* 2* 0.003 0.025** x x

Ihold =
 Hold current: maximum current device will pass without tripping in 20°C still air.
Itrip =
Trip current: minimum current at which the device will trip in 20°C still air.
Vmax =
Maximum voltage device can withstand without damage at rated current (Imax)
Imax =
Maximum fault current device can withstand without damage at rated voltage (Vmax)
Pd =Power dissipated from device when in the tripped state at 20°C still air.
Rmin =
Minimum resistance of device in initial (un-soldered) state.
R1max =
Maximum resistance of device at 20°C measured one hour after tripping or reflow soldering of 260°C for 20 sec.
Caution:
Operation beyond the specified rating may result in damage and possible arcing and flame.
Notes:
*1812L350 Typical Time-to-Trip is 50A at 0.013-0.020 seconds and meets the 8A at 5 seconds maximum Time-to-Trip requirement.
**1812L350 R1min=0.015ohm (resistance range 0.015-0.025ohm).
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