20LR450

POLYFUSE® 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 (Ω) 0.039 0.039 0.020 0.020 0.013 0.011 0.009 0.007 0.006 Resistance R typ (Ω) 0.072 0.072 0.042 0.042 0.026 0.020 0.016 0.014 0.012 R 1max (Ω) 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 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. LR Series Specifications are subject to change without notice.  Electronics Designers Guide www.littelfuse.com ©2006 Littelfuse POLYFUSE® Resettable PTCs Axial Leaded Strap Temperature Rerating Ambient Operation Temperature -40°C 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 -20°C 0°C 23°C 40°C 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 50°C 60°C 70°C 85°C 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 ©2006 Littelfuse POLYFUSE® 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 -40°C to +85°C 125°C +70°C, 1000 hours ±10% typical resistance change +85°C, 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 ©2006 Littelfuse D1 D2 C D1 D2 POLYFUSE® 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 ©2006 Littelfuse