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www.littelfuse.com
2006 Littelfuse
LT Series
Specifications are subject to change without notice.
Electronics Designers Guide
POLYFUSE
Resettable PTCs
Axial Leaded Strap
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
(A)
I
trip
(A)
V
(Vdc)
I
(A)
P
max.
(W)
Maximum Time
To Trip
Resistance
Agency
Approvals
Current
(A)
Time
(Sec.)
R
min
(
Ω
)
0.100
R
typ
(
Ω
)
0.200
R
1max
(
Ω
)
0.340
15LT070
0.7
1.5
15
100
1.0
3.50
5.00
X
X
15LT070S
0.7
1.5
15
100
1.0
3.50
5.00
0.100
0.200
0.340
X
X
24LT100
1.0
2.5
24
100
1.5
5.00
7.00
0.070
0.130
0.260
X
X
24LT100S
1.0
2.5
24
100
1.5
5.00
7.00
0.070
0.130
0.260
X
X
24LT100SS
1.0
2.5
24
100
1.5
5.00
7.00
0.070
0.130
0.260
X
X
24LT180
1.8
3.8
24
100
2.0
9.00
2.90
0.040
0.068
0.120
X
X
24LT180S
1.8
3.8
24
100
2.0
9.00
2.90
0.040
0.068
0.120
X
X
24LT180SS
1.8
3.8
24
100
2.0
9.00
2.90
0.040
0.068
0.120
X
X
24LT190
1.9
4.2
24
100
1.9
10.00
3.00
0.030
0.057
0.100
X
X
24LT190S
1.9
4.2
24
100
1.9
10.00
3.00
0.030
0.057
0.100
X
X
24LT260
2.6
5.2
24
100
2.3
13.0
5.0
0.025
0.042
0.076
X
X
24LT300
3.0
6.3
24
100
2.0
15.0
4.0
0.015
0.031
0.055
X
X
24LT310
3.1
6.0
24
100
2.5
16.0
5.0
0.018
0.030
0.055
X
X
24LT340
3.4
6.8
24
100
2.7
17.0
5.0
0.016
0.027
0.050
X
X
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
R50082521