POLYFUSE® Resettable PTCs
Axial Leaded Strap
LT Series
Description
The new LT series device provides reliable, noncycling
protection against overcharging and short circuits events
for rechargeable battery cells where resettable protection
is desired.
Features
• RoHS compliant and
lead-free
• Low resistance
• Provides overcurrent
protection at 100°C
trip temperature
• Weldable nickel terminals
• Compact design saves
board space
Agency Approvals
AGENCY
AGENCY FILE NUMBER
E183209
Applications
• Rechargeable battery cell
protection
R50082521
- Mobile phones
- Laptop computers
Electrical Characteristics
Maximum Time
To Trip
Agency
Resistance
P
Approvals
madx.
(W)
I hold
Part Number
(A)
I trip
(A)
V max
(Vdc)
I max
(A)
R min
(Ω)
R typ
(Ω)
R 1max
(Ω)
Current
Time
(Sec.)
(A)
3.50
3.50
5.00
5.00
5.00
9.00
9.00
9.00
10.00
10.00
13.0
15.0
16.0
17.0
15LT070
15LT070S
24LT100
24LT100S
24LT100SS
24LT180
24LT180S
24LT180SS
24LT190
24LT190S
24LT260
24LT300
24LT310
24LT340
0.7
0.7
1.0
1.0
1.0
1.8
1.8
1.8
1.9
1.9
2.6
3.0
3.1
3.4
1.5
1.5
2.5
2.5
2.5
3.8
3.8
3.8
4.2
4.2
5.2
6.3
6.0
6.8
15
15
24
24
24
24
24
24
24
24
24
24
24
24
100
100
100
100
100
100
100
100
100
100
100
100
100
100
1.0
1.0
1.5
1.5
1.5
2.0
2.0
2.0
1.9
1.9
2.3
2.0
2.5
2.7
5.00
5.00
7.00
7.00
7.00
2.90
2.90
2.90
3.00
3.00
5.0
0.100
0.100
0.070
0.070
0.070
0.040
0.040
0.040
0.030
0.030
0.025
0.015
0.018
0.016
0.200
0.200
0.130
0.130
0.130
0.068
0.068
0.068
0.057
0.057
0.042
0.031
0.030
0.027
0.340
0.340
0.260
0.260
0.260
0.120
0.120
0.120
0.100
0.100
0.076
0.055
0.055
0.050
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
4.0
5.0
5.0
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 (Vmax
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.
)
LT Series
ꢀ
www.littelfuse.com
Specifications are subject to change without notice.
Electronics Designers Guide
©2006 Littelfuse