POLY-FUSE® Resettable PTCs Axial Lead Battery Strap Type > ST Series ST Series RoHS Description The new ST 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 • Low resistance • Provides overcurrent protection at 125°C trip temperature • Weldable Nickel terminals Agency Approvals Applications AGENCY • Rechargeable battery cell protection AGENCY FILE NUMBER E183209 R50119583 Electrical Characteristics Part Number I hold (A) I trip (A) V max (Vdc) I max (A) Pd max. (W) 15ST175 1.75 3.8 15 100 2.5 Maximum Time To Trip Agency Approvals Resistance Current (A) Time (Sec.) R min (Ω) R typ (Ω) R 1max (Ω) 8.75 5.00 0.050 0.090 0.120 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 15ST175 40°C 50°C 60°C 70°C 85°C 1.30 1.20 1.10 0.90 Hold Current (A) 2.50 2.30 2.00 1.75 1.50 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: 04/01/15 POLY-FUSE® Resettable PTCs Axial Lead Battery Strap Type > ST Series Temperature Rerating Curve 1.75 A Average Time Current Curves 170% Percentage of Rated Current Time in Seconds 150% ST 10 1 130% 110% 90% 70% 50% 30% 10% -40 -30 -20 0.1 0.01 0.01 -10 0 10 20 30 40 Temperature (°C) 50 60 70 80 Note: Typical Temperature rerating curve, refer to table for derating data 0.1 1 10 Physical Specifications 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. Lead Material 0.13mm nominal thickness, quarter-hard Nickel Insulating Material Polyester tape Environmental Specifications Operating/Storage Temperature Maximum Device Surface Temperature in Tripped State -40°C to +85°C 125°C Passive Aging +70°C, 1000 hours -/+5% typical resistance change Humidity Aging +85°C, 85% R.H., 7 days, -/+5% typical resistance change Vibration MIL–STD–883, Condition A, No change © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 04/01/15 POLY-FUSE® Resettable PTCs Axial Lead Battery Strap Type > ST Series Figure 1 Dimensions Figure 2 (Items with S at end of part number) SLIT 0.5 x 4.0 NOMINAL (.02”x .15”) A A Figure 1 Figure 2 (Items with S at end of partBnumber) E B SLIT D1 A D2 E D1 Part Number 15ST175 D1 A C B E 0.5 x 4.0 NOMINAL (.02”x .15”) C E B A B D2 Inches D2 C D1 mm C Inches mm Inches D2 D1 mmC D2 E Inches mm Inches mm Inches mm Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Min. Min. Min. Min Max. Min. 0.82 0.16 4.1 0.16 4.1 0.01 0.16 0.91 20.9 23.1 0.19 0.20 4.9 5.2 0.02 Top Side 0.04 0.6 1.0 3.9 Max. 4.1 Product Series ST Part Marking System Part Ordering Number System Current Rating 175 XX9U Top Side ST 175 XX9U 15 ST 175 U Littelfuse Trademark Product Series Lot Number (Contact Littelfuse for additional information) QUANTITY CODE: U = 500 (bulk) Current Rating LEAD OPTIONS: Blank = standard Littelfuse Trademark Lot Number (Contact Littelfuse for additional information) 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 15ST175 15ST175U 1.75 175 Bulk 500 U © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 04/01/15