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POLYFUSE(R) Resettable PTCs
Axial Leaded Strap
LR Series
Description The new LR 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 * Slim, low profile design Applications * Rechargeable battery cell protection * Compact design saves board space * Low resistance
Agency Approvals
AGENCY AGENCY FILE NUMBER E183209 R50082521
Electrical Characteristics
I hold (A) 1.9 1.9 2.6 2.6 3.8 4.5 5.5 6.0 7.3 I trip (A) 3.9 3.9 5.8 5.8 8.3 8.9 10.5 11.7 14.1 V max (Vdc) 15 15 15 15 15 20 20 20 20 I max (A) 100 100 100 100 100 100 100 100 100 Pd max. (W) 1.2 1.2 2.5 2.5 2.5 2.5 2.8 2.8 3.3 Maximum Time To Trip Current (A) 9.50 9.50 13.00 13.00 19.00 22.50 27.50 30.00 30.00 Time (Sec.) 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 R min () 0.039 0.039 0.020 0.020 0.013 0.011 0.009 0.007 0.006 Resistance R typ () 0.072 0.072 0.042 0.042 0.026 0.020 0.016 0.014 0.012 R 1max () 0.102 0.102 0.063 0.063 0.037 0.028 0.022 0.019 0.015 X X X X X X X X X X X X X X X X X X Agency Approvals
Part Number
15LR190 15LR190S 15LR260 15LR260S 15LR380 20LR450 20LR550 20LR600 20LR730
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.
LR 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 15LR190 15LR190S 15LR260 15LR260S 15LR380 20LR450 20LR550 20LR600 20LR730 2.80 2.80 3.80 3.80 5.50 6.50 8.00 8.70 10.60 2.50 2.50 3.40 3.40 4.90 5.80 7.10 7.80 9.50 2.30 2.30 3.10 3.10 4.40 5.30 6.20 7.10 8.60 1.90 1.90 2.60 2.60 3.80 4.50 5.50 6.00 7.30 -20C 0C 23C 40C Hold Current (A) 1.60 1.60 2.20 2.20 3.30 3.90 4.70 5.20 6.30 1.50 1.50 2.00 2.00 3.00 3.60 4.30 4.70 5.70 1.40 1.40 1.90 1.90 2.80 3.30 4.00 4.40 5.40 1.20 1.20 1.70 1.70 2.50 2.90 3.60 3.90 4.70 1.00 1.00 1.40 1.40 2.10 2.50 3.00 3.30 4.00 50C 60C 70C 85C
Average Time Current Curves
Temperature Rerating Curve
170% 150% B 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 B A
A: 15LR380 B: 20LR450
C: 20LR730
A: 15LR190,15LR190S, 15LR260, 15LR260S, 20LR450
B: 15LR380, 20LR550, 20LR600, 20LR730
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.
LR 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. 70days 5% typical resistance change MIL-STD-883C, Method 2007.1, 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
B
Marking
D1 D2
E
B
Marking
D1 D2
E
C
C
Part Number 15LR190 15LR190S 15LR260 15LR260S 15LR380S 20LR450S 20LR550S 20LR600S 20LR730S
A Inches mm Inches
B mm Inches
C mm
D1 Min. 0.22 Min. 5.50
D2 Inches Min. 0.22 0.22 0.16 0.16 0.16 0.21 0.21 0.16 0.16 Min. 5.50 5.50 4.10 4.10 4.10 5.30 5.30 4.10 4.10
E mm Figure Min Max. Min. Max. 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.22 0.22 0.16 0.16 0.16 0.21 0.21 0.16 0.16 3.90 3.90 3.90 3.90 4.90 5.90 4.90 5.90 5.90 4.10 4.10 4.10 4.10 5.10 6.10 5.10 6.10 6.10 1 2 1 2 1 1 1 1 1
Inches mm Inches mm
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. 0.78 0.78 0.82 0.82 0.94 0.94 1.38 0.94 1.07 0.87 19.90 22.10 0.19 0.87 19.90 22.10 0.19 0.91 20.90 23.10 0.19 0.91 20.90 23.10 0.19 1.02 24.00 26.00 0.27 1.02 24.00 26.00 0.39 1.46 35.00 37.00 0.27 1.02 24.00 26.00 0.55 1.15 27.10 29.10 0.55 0.22 0.22 0.22 0.22 0.30 4.90 4.90 4.90 4.90 6.90 5.50 5.50 5.50 5.50 7.50 0.02 0.02 0.02 0.04 0.04
Top Side
0.60 0.60
1.00 1.00 1.00 1.00 1.00
0.22 5.50 Product Series 0.16 0.16 0.16 4.10 4.10 4.10
0.04 0.60 LR 190S 0.02 XX9R 0.60 0.04 0.02 0.04 0.04 0.04 0.04 0.04 0.60 0.60 0.60 0.60 0.60
Current Rating
Trademark 0.41 9.90 10.50 0.02
Littelfuse
1.00(Contact Littelfuse 0.21 5.30 1.00 1.00 1.00
for additional information)
Lot Number
0.30
6.90
7.50
0.02
0.21 0.16 0.16
5.30 4.10 4.10
0.57 13.90 14.50 0.02 0.57 13.90 14.50 0.02
LR Series Specifications are subject to change without notice.
Electronics Designers Guide
www.littelfuse.com (c)2006 Littelfuse
D1
D2 C
D1
D2
POLYFUSE(R) Resettable PTCs
Axial Leaded Strap
C
Part Marking System
Top Side Product Series
Part Numbering System
15 LR 190 S U
Current Rating
190S XX9R
Littelfuse Trademark
LR
QUANTITY CODE U: 500 (bulk) LEAD OPTIONS: Blank = standard S = slit lead
Lot Number (Contact Littelfuse for additional information)
HOLD CURRENT (VALUE DIVIDED BY 100 = HOLD CURRENT IN AMPS) SERIES Voltage Rating (VDC)
Packaging
I hold (A) All Ratings Packaging Option Bulk Quantity 500 Quantity & Packaging Codes U
LR Series Specifications are subject to change without notice.
Electronics Designers Guide
www.littelfuse.com (c)2006 Littelfuse

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