POLYFUSE® Resettable PTCs
Surface Mount > Lo Rho Series
Lo Rho Surface Mount Series
Description
The Littelfuse Lo Rho Surface Mount PPTC (polymer
positive temperature coefficient) series offers ultra low
normal operating resistance while maintains the same
performance of existing Littelfuse PPTC products.
Available in 5 hold current ratings, all devices are TUV
and UL certified and possess a maximum fault current
rating of 40A.
Features
tꢀ-ꢀ Pꢀ3IPꢀꢁMPXꢀSFTJTUBODFꢀ
at normal operating hold
current)
tꢀ$ꢀ PNQBDUꢀEFTJHOꢀTBWFTꢀ
board space
tꢀ5ꢀ IJOꢃQSPmMFꢀꢄꢅꢆꢇꢈNN
Agency Approvals
tꢀ3ꢀ P)4ꢀDPNQMJBOUꢂꢀ-FBEꢀ
'SFFꢀBOEꢀ)BMPHFOꢀ'SFF
tꢀ'ꢀ BTUꢀSFTQPOTFꢀUPꢀGBVMUꢀ
AGENCY
AGENCY FILE NUMBER
tꢀ$ꢀ PNQBUJCMFꢀXJUIꢀIJHIꢀ
temperature solders
E183209
currents
R50119118
Applications
tꢀ6ꢀ 4#ꢀQFSJQIFSBMT
tꢀ%ꢀ JTLꢀESJWFT
tꢀ1ꢀ %"TꢀꢉꢀEJHJUBMꢀDBNFSBT
tꢀ(ꢀ BNFꢀDPOTPMFꢀQPSUꢀ
protection
tꢀ$ꢀ %ꢃ30.T
tꢀ1ꢀ MVHꢀBOEꢀQMBZꢀQSPUFDUJPOꢀ
for motherboards and
peripherals
Electrical Characteristics
MaximumTime
ToTrip
Agency
Approvals
Resistance
P d
max.
(W)
I hold
(A)
I trip
(A)
V max
(Vdc)
I max
(A)
Part Number
Marking
R min
R 1max
Current
(A)
Time
(Sec.)
(Ω)
(Ω)
X
X
X
X
X
X
X
X
X
X
X
X
0805L110SLYR
1206L110SLYR
1206L150SLYR
1210L200SLYR
ꢊꢋꢊꢅ-ꢌꢈꢅ4-ꢃ4:3
1812L190SLPR
ꢃ)
ꢃ)
1.10
1.10
1.50
2.00
3.50
1.90
1.80
2.20
3.00
4.00
ꢇꢆ ꢅ ꢅ
4.90
6
6
6
6
6
6
50
50
50
50
50
50
0.6
0.8
0.8
0.8
0.8
1.0
8.00
8.00
8.00
8.00
ꢊꢇꢆꢈꢅ
9.50
0.30
0.30
0.30
3.00
2.00
4.50
0.030
0.015
0.010
0.005
0.003
0.003
0.130
0.100
0.065
0.024
0.018
0.025
ꢃ,
ꢃ-
ꢃ5
LF 19
I holdꢀꢍꢀ)PMEꢀDVSSFOUꢎꢀNBYJNVNꢀDVSSFOUꢀEFWJDFꢀXJMMꢀQBTTꢀXJUIPVUꢀUSJQQJOHꢀJOꢀꢋꢅ¡$ꢀTUJMMꢀBJSꢆꢀ
I tripꢀꢍꢀ5SJQꢀDVSSFOUꢎꢀNJOJNVNꢀDVSSFOUꢀBUꢀXIJDIꢀUIFꢀEFWJDFꢀXJMMꢀUSJQꢀJOꢀꢋꢅ¡$ꢀTUJMMꢀBJSꢆ
V max = Maximum voltage device can withstand without damage at rated current (I max)
I max = Maximum fault current device can withstand without damage at rated voltage (Vmax
P dꢀꢍꢀ1PXFSꢀEJTTJQBUFEꢀGSPNꢀEFWJDFꢀXIFOꢀJOꢀUIFꢀUSJQQFEꢀTUBUFꢀBUꢀꢋꢅ¡$ꢀTUJMMꢀBJSꢆ
R minꢀꢍꢀ.JOJNVNꢀSFTJTUBODFꢀPGꢀEFWJDFꢀJOꢀJOJUJBMꢀꢁVOꢃTPMEFSFEꢏꢀTUBUFꢆ
)
R 1maxꢀꢍꢀꢀ.BYJNVNꢀSFTJTUBODFꢀPGꢀEFWJDFꢀBUꢀꢋꢅ¡$ꢀNFBTVSFEꢀPOFꢀIPVSꢀBGUFSꢀUSJQQJOHꢀPSꢀSFnPXꢀTPMEFSJOHꢀPGꢀꢋꢐꢅ¡$ꢀGPSꢀꢋꢅꢀTFDꢆ
Caution:ꢀ0QFSBUJPOꢀCFZPOEꢀUIFꢀTQFDJmFEꢀSBUJOHꢀNBZꢀSFTVMUꢀJOꢀEBNBHFꢀBOEꢀQPTTJCMFꢀBSDJOHꢀBOEꢀnBNFꢆ
©2009 Littelfuse, Inc.
Lo Rho Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/LoRho.html for current information.
Revised: October 7, 2009