POLY-FUSE
®
Resettable PTCs
Axial Lead Battery Strap Type > LT Series
LT Series
Description
RoHS
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
• Weldable Nickel terminals
• Compact design saves
board space
AGENCY FILE NUMBER
E183209
R50119583
• Low resistance
• Provides overcurrent
protection at 100°C
trip temperature
Agency Approvals
AGENCY
Applications
• Rechargeable battery cell
protection
- Mobile phones
- Laptop computers
Electrical Characteristics
P
d
max.
(W)
1.5
Maximum Time
To Trip
Current
(A)
5.00
Time
(Sec.)
7
.00
R
min
(Ω)
0.070
Resistance
R
typ
(Ω)
0.130
R
1max
(Ω)
0.260
X
X
Part Number
I
hold
(A)
1.0
I
trip
(A)
2.5
V
max
(Vdc)
24
I
max
(A)
100
Agency
Approvals
24LT100
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.
Temperature Rerating
Ambient Operation Temperature
-40°C
Part Number
24LT100
WARNING
• Users shall independently assess the suitability of these devices for each of their applications
• Operation of these devices beyond the stated maximum ratings could result in damage to the devices and lead to electrical arcing and/or fire
• These devices are intended to protect against the effects of temporary over-current or over-temperature conditions and are not intended to perform as protective devices where such
conditions are expected to be repetitive or prolonged in duration
• Exposure to silicon-based oils, solvents, electrolytes, acids, and similar materials can adversely affect the performance of these PPTC devices
• These devices undergo thermal expansion under fault conditions, and thus shall be provided with adequate space and be protected against mechanical stresses
• Circuits with inductance may generate a voltage (L di/dt) above the rated voltage of the PPTC device.
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/22/17
-20°C
1.60
0°C
1.40
20°C
1.00
40°C
Hold Current (A)
0.80
50°C
0.70
60°C
0.60
70°C
0.44
85°C
0.23
1.86
POLY-FUSE
®
Resettable PTCs
Axial Lead Battery Strap Type > LT Series
Average Time Current Curves
1.00 A
Temperature Rerating Curve
190%
10
LT
Percentage of Rated Current
170%
150%
130%
110%
90%
70%
50%
30%
10%
-40
-30 -20
-10
0
10
20 30
40
Temperature (°C)
50
60
70
80
Time in Seconds
1
0.1
Note:
Typical Temperature rerating curve, refer to table for derating data
Physical Specifications
0.01
0.01
0.1
1
10
Terminal Material
Insulating Material
0.13mm nominal thickness, quarter-hard
Nickel
Polyester tape
Current in Amperes
The average time current curves and Temperature Rerating curve performance is affected
by a number or variables, and these curves provided as guidance only. Customer must
verify the performance in their application.
Environmental Specifications
Additional Information
Operating/Storage
Temperature
Maximum Device Surface
Temperature in Tripped State
-40°C to +85°C
125°C
+70°C, 1000 hours
-/+10% typical resistance change
+85°C, 85%R.H.,7days,
-/+5% typical resistance
change
MIL
-STD-883, Condition A,
No change
Datasheet
Resources
Samples
Passive Aging
Humidity Aging
Vibration
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/22/17
POLY-FUSE
®
Resettable PTCs
Axial Lead Battery Strap Type > LT Series
Dimensions
Figure 1
SLIT
A
Figure 2
(Items with S at end of part number)
0.5 x 4.0 NOMINAL
(.02”x .15”)
A
SLIT
Figure 3
(Items with SS at end of part number)
0.5 x 4.0 NOMINAL
(.02”x .15”)
A
1
B
D1
Figure 2
(Items with S at end of part number)
E
SLIT
0.5 x 4.0 NOMINAL
(.02”x .15”)
D2
A
B
D1
C
Figure 3
(Items with SS at end of part number)
SLIT
0.5 x 4.0 NOMINAL
(.02”x .15”)
D2
A
E
B
E
D1
C
D2
C
E
B
D2
C
Part
Number
24LT100
A
D1
E
B
C
B
E
C
mm
D1
D1
mm
1
D2
D2
C
E
Inches
mm
4.1
Inches
mm
D2
Inches
Inches
in.
mm
in.
mm
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Min. Min. Min. Min Max. Min. Max.
0.82 0.91 20.9 23.1 0.19 0.20 4.9
5.2 0.02 0.04 0.6
Top Side
100
XX9R
Littelfuse
Trademark
0.16 4.1 0.16 4.1 0.01 0.16 3.9
Product Series
Part Marking System
Top Side
Product Series
LT
Part Ordering
Current Rating
System
Number
24 LT 100 U
QUANTITY CODE
U:
500 (bulk)
LEAD OPTIONS:
Blank = standard
HOLD CURRENT
SERIES
Voltage Rating (VDC)
(VALUE DIVIDED BY 100 = HOLD CURRENT IN AMPS)
Lot Number
(Contact Littelfuse
for additional
information)
100
XX9R
Littelfuse
Trademark
LT
Current Rating
Lot Number
(Contact Littelfuse
for additional
information)
Packaging
Part Number
24LT100
Ordering
Number
24LT100U
I
hold
(A)
1.0
I
hold
Code
100
Packaging
Option
Bulk
Quantity
500
Quantity &
Packaging Codes
U
Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and
test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications.
Read complete Disclaimer Notice at
www.littelfuse.com/disclaimer-electronics.
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/22/17
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