POLY-FUSE® Resettable PTCs Axial Lead Battery Strap Type > LT Series LT Series RoHS 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 • Low resistance • Provides overcurrent protection at 100°C trip temperature • RoHS compliant and lead–free • Weldable Nickel terminals • Compact design saves board space Agency Approvals AGENCY AGENCY FILE NUMBER Applications E183209 • Rechargeable battery cell protection - Mobile phones - Laptop computers R50119583 Electrical Characteristics Part Number I hold (A) I trip (A) V max (Vdc) I max (A) Pd max. (W) 24LT100 1.0 2.5 24 100 1.5 Maximum Time To Trip Agency Approvals Resistance Current (A) Time (Sec.) R min (Ω) R typ (Ω) R 1max (Ω) 5.00 7.00 0.070 0.130 0.260 X X I hold = Hold current: maximum current device will pass without tripping in 20°C still air. R typ = Typical resistance of device in initial (un-soldered) state. I trip = Trip current: minimum current at which the device will trip in 20°C still air. R 1max = Maximum resistance of device at 20°C measured one hour after tripping or reflow soldering of 260°C for 20 sec. V max = Maximum voltage device can withstand without damage at rated current (I max) Caution: Operation beyond the specified rating may result in damage and possible arcing and flame. 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. Temperature Rerating Ambient Operation Temperature -40°C -20°C 0°C 20°C Part Number 24LT100 40°C 50°C 60°C 70°C 85°C 0.70 0.60 0.44 0.23 Hold Current (A) 1.86 1.60 1.40 1.00 0.80 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. © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 11/05/15 POLY-FUSE® Resettable PTCs Axial Lead Battery Strap Type > LT Series Temperature Rerating Curve 1.00 A Average Time Current Curves 190% LT 170% 150% Percentage of Rated Current Time in Seconds 10 1 130% 110% 90% 70% 50% 30% 10% -40 -30 -20 -10 0 10 20 30 40 Temperature (°C) 50 60 70 80 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 0.13mm nominal thickness, quarter-hard Nickel Insulating Material 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 Datasheet Resources Operating/Storage Temperature -40°C to +85°C Maximum Device Surface Temperature in Tripped State 125°C Passive Aging +70°C, 1000 hours -/+10% typical resistance change Humidity Aging +85°C, 85%R.H.,7days, -/+5% typical resistance change Vibration MIL-STD-883, Condition A, No change Samples © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 11/05/15 POLY-FUSE® Resettable PTCs Axial Lead Battery Strap Type > LT Series Dimensions Figure 1 SLIT E 0.5 x 4.0 NOMINAL (.02”x .15”) D2 A B D2 C Part Number 24LT100 A Inches SLIT D1 E mm (Items with SS at end of part number) B C A D1 0.5 x 4.0 NOMINAL (.02”x .15”) Figure 3 (Items with S at end of part number) E D1 SLIT A Figure 2 SLIT (Items with SS at end of part number) 0.5 x 4.0 NOMINAL (.02”x .15”) A 1 B Figure 3 Figure 2 (Items with S at end of part number) D2 B D1 D2 C C E B Inches E B E 0.5 x 4.0 NOMINAL (.02”x .15”) D2 A C mm D1 Inches D1 mm in. D2 D2 mm C C in. mm E Inches 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 1 0.16 4.1 0.16 4.1 0.01 0.16 3.9 4.1 Product Series LT Part Marking System 100 XX9R Littelfuse Trademark Top Side Product Series LT 100 XX9R Rating Part OrderingCurrent Number System Lot Number (Contact Littelfuse for additional information) 24 LT 100 U QUANTITY CODE U: 500 (bulk) Current Rating Littelfuse Trademark Lot Number (Contact Littelfuse for additional information) LEAD OPTIONS: Blank = standard HOLD CURRENT (VALUE DIVIDED BY 100 = HOLD CURRENT IN AMPS) SERIES Voltage Rating (VDC) Packaging Part Number Ordering Number I hold (A) I hold Code Packaging Option Quantity Quantity & Packaging Codes 24LT100 24LT100U 1.0 100 Bulk 500 U © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 11/05/15