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POLYFUSE(R) 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 * Weldable nickel terminals * Compact design saves board space Applications * Rechargeable battery cell protection - Mobile phones - Laptop computers * Low resistance * Provides overcurrent protection at 100C trip temperature
Agency Approvals
AGENCY AGENCY FILE NUMBER E183209 R50082521
Electrical Characteristics
I hold (A) 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 I trip (A) 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 V max (Vdc) 15 15 24 24 24 24 24 24 24 24 24 24 24 24 I max (A) 100 100 100 100 100 100 100 100 100 100 100 100 100 100 Pd max. (W) 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 Maximum Time To Trip Current (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 Time (Sec.) 5.00 5.00 7.00 7.00 7.00 2.90 2.90 2.90 3.00 3.00 5.0 4.0 5.0 5.0 R min () 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 Resistance R typ () 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 R 1max () 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 Agency Approvals
Part Number
15LT070 15LT070S 24LT100 24LT100S 24LT100SS 24LT180 24LT180S 24LT180SS 24LT190 24LT190S 24LT260 24LT300 24LT310 24LT340
I hold = Hold current: maximum current device will pass without tripping in 20C still air. I trip = Trip current: minimum current at which the device will trip in 20C 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 20C 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 20C measured one hour after tripping or reflow soldering of 260C for 20 sec. Caution: Operation beyond the specified rating may result in damage and possible arcing and flame.
LT Series Specifications are subject to change without notice.
Electronics Designers Guide
www.littelfuse.com (c)2006 Littelfuse
POLYFUSE(R) Resettable PTCs
Axial Leaded Strap
Temperature Rerating
Ambient Operation Temperature -40C Part Number 15LT070 15LT070S 24LT100 24LT100S 24LT100SS 24LT180 24LT180S 24LT180SS 24LT190 24LT260 24LT300 24LT310 24LT340 1.20 1.20 1.86 1.86 1.86 3.13 3.13 3.13 3.32 4.30 5.10 5.36 5.52 1.09 1.09 1.60 1.60 1.60 2.68 2.68 2.68 2.86 3.72 4.40 4.58 4.79 0.85 0.85 1.40 1.40 1.40 2.20 2.20 2.20 2.40 3.10 3.70 3.70 4.00 0.70 0.70 1.00 1.00 1.00 1.80 1.80 1.80 1.90 2.60 3.00 3.10 3.40 -20C 0C 20C 40C Hold Current (A) 0.50 0.50 0.80 0.83 0.83 1.33 1.33 1.33 1.48 1.98 2.30 2.36 2.60 0.45 0.45 0.70 0.70 0.70 1.10 1.10 1.10 1.25 1.69 1.95 2.01 2.24 0.35 0.35 0.60 0.60 0.60 0.90 0.90 0.90 1.10 1.40 1.60 1.70 1.90 0.28 0.28 0.44 0.44 0.44 0.65 0.65 0.65 0.79 1.11 1.25 1.30 1.51 0.16 0.16 0.23 0.23 0.23 0.36 0.36 0.36 0.43 0.60 0.69 0.71 0.78 50C 60C 70C 85C
Average Time Current Curves
Temperature Rerating Curve
190% 170% 150% Percentage of Rated Current 130% 110% 90% 70% 50% 30% 10% -40 -30 -20 -10 0 10 20 30 40 Temperature (C) 50 60 70 80
A: 24LT100S B: 24LT180
C: 24LT190
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.
LT Series Specifications are subject to change without notice.
Electronics Designers Guide
www.littelfuse.com (c)2006 Littelfuse
POLYFUSE(R) Resettable PTCs
Axial Leaded Strap
Physical Specifications
Terminal Material 0.13mm nominal thickness, quarter-hard nickel
Environmental Specifications
Operating/Storage Temperature Maximum Device Surface Temperature in Tripped State Passive Aging Humidity Aging -40C to +85C 125C +70C, 1000 hours 10% typical resistance change +85C, 85%R.H. 7days 5% typical resistance change MIL-LTD-883C, Condition A No change
Insulating Material Polyester tape
Vibration
Dimensions
Figure 1
SLIT A
Figure 2
0.5 x 4.0 NOMINAL (.02"x .15") A SLIT
Figure 3
0.5 x 4.0 NOMINAL (.02"x .15") A
B
Marking
D1 D2
E
B
Marking
D1 D2
E
B
Marking
D1 D2
E
C
C
C
Part Number 15LT070 15LT070S 24LT100 24LT100S 24LT100SS 24LT180 24LT180S 24LT180SS 24LT190 24LT190S 24LT260 24LT300 24LT310 24LT340
A Inches mm Inches
B mm 4.9 4.9 4.9 4.9 4.9 4.9 4.9 5.2 5.2 5.2 5.2 5.2 5.2 5.2 11 11 Inches
C mm in.
D1 mm in.
D2 mm 5.5 5.5 4.1 4.1 4.1 4.1 4.1 4.1 5 5 5 6.3 5 5 Inches 0.01 0.22 0.01 0.22 0.01 0.16 0.01 0.16 0.01 0.16 0.01 0.16 0.01 0.16 0.01 0.16 0.01 0.20 0.01 0.20 0.01 0.20 0.00 0.25 0.01 0.20 0.01 0.20
E mm 3.9 3.9 3.9 3.9 3.9 3.9 3.9 3.9 4.8 4.8 5.9 6 5.9 5.9 4.1 4.1 4.1 4.1 4.1 4.1 4.1 4.1 5.4 5.4 6.1 6.6 6.1 6.1
Fig.
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Min. Min. Min. Min Max. Min. Max. 0.78 0.87 19.9 22.1 0.19 0.20 0.78 0.87 19.9 22.1 0.19 0.20 0.82 0.91 20.9 23.1 0.19 0.20 0.82 0.91 20.9 23.1 0.19 0.20 0.82 0.91 20.9 23.1 0.19 0.20 0.94 1.02 0.94 1.02 0.94 1.02 24 24 24 26 26 26 0.19 0.20 0.19 0.20 0.19 0.20
Top Side 0.03 0.05 0.7
1.2 0.22 5.5 Product Series 1.2 1 1 1 1 1 1 1 1 1.1 1 1 0.22 0.16 0.16 0.16 0.16 0.16 0.20 0.20 0.20 0.25 0.20 0.20
Current Rating
0.22 0.22 0.16 0.16 0.16 0.16 0.16 0.16 0.20 0.20 0.20 0.25 0.20 0.20
1 2 1 2 3 1 2 3 1 2 1 1 1 1
0.03 0.05 LT 0.02 0.04 0.02 0.04 0.02 0.04 0.02 0.04 0.02 0.04 0.02 0.04 0.02 0.04
XXJJ 0.02 0.04 0.6
190S
0.7 0.6 0.6 0.6 0.6 0.6 0.5 0.5 0.6 0.5 0.6 0.6
5.5 4.1 4.1 4.1 4.1 4.1 5 5 5 6.3 5 5
Littelfuse 4.9 5.2 Trademark
Lot 1 Number 0.16 4.1 (Contact Littelfuse for additional information)
0.84 0.92 21.3 23.4 0.40 0.43 10.2 0.84 0.92 21.3 23.4 0.40 0.43 10.2 0.94 1.02 0.94 1.02 0.94 1.02 24 24 24 26 26 26 1.12 1.25 28.4 31.8 0.51 0.53 13
0.43 0.47 10.8 11.9 0.02 0.04 13.5 0.02 0.04 0.58 0.63 14.8 15.9 0.02 0.04 0.58 0.63 14.8 15.9 0.02 0.04
LT Series Specifications are subject to change without notice.
Electronics Designers Guide
www.littelfuse.com (c)2006 Littelfuse
D2 C
D1
D2
POLYFUSE Resettable PTCs
(R)
C
C
Axial Leaded Strap
Part Marking System
Top Side Product Series
Part Numbering System
24 LT 100 SS U
Current Rating
190S XXJJ
Littelfuse Trademark
LT
QUANTITY CODE: U = 500 (bulk) LEAD OPTIONS: Blank = standard S = slit lead SS = both leads slit HOLD CURRENT (VALUE DIVIDED BY 100 = HOLD CURRENT IN AMPS) SERIES VOLTAGE RATING (VDC)
Lot Number (Contact Littelfuse for additional information)
Packaging
I hold (A) All Ratings Packaging Option Bulk Quantity 500 Quantity & Packaging Codes U
LT Series Specifications are subject to change without notice.
Electronics Designers Guide
www.littelfuse.com (c)2006 Littelfuse

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