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Littelfuse LT Series User Manual

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117
Revised: June 4, 2010
POLYFUSE
®
Resettable PTCs
© 2010 Littelfuse, Inc
POLYFUSE
®
Resettable PTCs
LT Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/LT.html for current information.
LT Series
Axial Lead Battery Strap Type > LT Series
LT Series
The new LT Series device provides reliable, noncycling
protection against overcharging and short circuits events
for rechargeable battery cells where resettable protection
is desired.
Electrical Characteristics
Part Number
I
hold
(A)
I
trip
(A)
V
max
(Vdc)
I
max
(A)
P
d
max.
(W)
Maximum Time
To Trip
Resistance
Agency
Approvals
Current
(A)
Time
(Sec.)
R
min
(Ω)
R
typ
(Ω)
R
1max
(Ω)
15LT070 0.7 1.5 15 100 1.0 3.50 5.00 0.100 0.200 0.340
XX
15LT070S 0.7 1.5 15 100 1.0 3.50 5.00 0.100 0.200 0.340
XX
24LT100 1.0 2.5 24 100 1.5 5.00 7.00 0.070 0.130 0.260
XX
24LT100S 1.0 2.5 24 100 1.5 5.00 7.00 0.070 0.130 0.260
XX
24LT100SS 1.0 2.5 24 100 1.5 5.00 7.00 0.070 0.130 0.260
XX
24LT180 1.8 3.8 24 100 2.0 9.00 2.90 0.040 0.068 0.120
XX
24LT180S 1.8 3.8 24 100 2.0 9.00 2.90 0.040 0.068 0.120
XX
24LT180SS 1.8 3.8 24 100 2.0 9.00 2.90 0.040 0.068 0.120
XX
24LT190 1.9 4.2 24 100 1.9 10.00 3.00 0.030 0.057 0.100
XX
24LT190S 1.9 4.2 24 100 1.9 10.00 3.00 0.030 0.057 0.100
XX
24LT260 2.6 5.2 24 100 2.3 13.0 5.0 0.025 0.042 0.076
XX
24LT300 3.0 6.3 24 100 2.0 15.0 4.0 0.015 0.031 0.055
XX
24LT310 3.1 6.0 24 100 2.5 16.0 5.0 0.018 0.030 0.055
XX
24LT340 3.4 6.8 24 100 2.7 17.0 5.0 0.016 0.027 0.050
XX
I
hold
= Hold current: maximum current device will pass without tripping in 20°C still air.
I
trip
= Trip current: minimum current at which the device will trip in 20°C still air.
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 (V
max
)
P
d
= Power dissipated from device when in the tripped state at 20°C still air.
R
min
= Minimum resistance of device in initial (un-soldered) state.
R
typ
= Typical resistance of device in initial (un-soldered) state.
R
1max
= 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.
Description
Features
Applications
• RoHS compliant and
lead–free
• Weldable Nickel terminals
• Compact design saves
board space
• Low resistance
• Provides overcurrent
protection at 100°C
trip temperature
• Rechargeable battery cell
protection
- Mobile phones
- Laptop computers
Agency Approvals
AGENCY AGENCY FILE NUMBER
E183209
R50119583
Items with S and SS at end of part number identify items with slit lead option. See Dimension Drawing and Part Ordering Number System sections of this document for more information.
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Summary of Contents

Page 1 - LT Series

117Revised: June 4, 2010POLYFUSE® Resettable PTCs© 2010 Littelfuse, IncPOLYFUSE® Resettable PTCsLT SeriesSpecifications are subject to change without n

Page 2

118Revised: June 4, 2010POLYFUSE® Resettable PTCs© 2010 Littelfuse, Inc.LT SeriesSpecifications are subject to change without notice. Please refer to w

Page 3

119Revised: June 4, 2010POLYFUSE® Resettable PTCs© 2010 Littelfuse, IncPOLYFUSE® Resettable PTCsLT SeriesSpecifications are subject to change without n

Page 4 - 24 LT 190 S U

120Revised: June 4, 2010POLYFUSE® Resettable PTCs© 2010 Littelfuse, Inc.LT SeriesSpecifications are subject to change without notice. Please refer to w

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