Resettable Ptc Products Page 61 Resettable PTC Products

POLY-FUSE Resettable PTCs 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 03/22/17 Surface Mount > 250S Series The 250S High Voltage Radial device is a Polymer-based PTC suitable to protect telephony equipment against lightining and power cross strikes. The 250S Series is fully compatible with telecommunications standards, and is offered in horizontal and new vertical surface mount package. Agency Approvals Electrical Characteristics Part Number Device Mounting Layout I hold (A) I trip (A) V max (V int /V op ) I max (A) P d typ. (W) Time to Trip at 1A Resistance Agency Approvals Typical (Sec.) Maximum (Sec.) R min ( ) R max ( ) R 1max ( ) 250S130 Horizontal 0.13 0.26 250/60 3 1.2 0.9 4.0 4 13 20 - 250S130-RA 0.13 0.26 250/60 3 1.2 1.4 4.0 6.5 10 15 - 250S130-RB 0.13 0.26 250/60 3 1.2 0.7 4.0 9 13 20 - 250S130-RC 0.13 0.26 250/60 3 1.2 1.1 4.0 7 11 17 - 250S130V Vertical 0.13 0.26 250/60 3 1.2 2.0 4.0 4 13 20 - 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 int = Maximum voltage the device can withstand without damage at rated current (I max) V op = The device regular operation voltage I max = Maximum fault current device can withstand without damage at rated voltage (V max ) 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 max = Maximum resistance of device in initial (un-soldered) state. R 1max = Maximum resistance of device at 20C measured one hour after tripping. Caution: Operation beyond the specified rating may result in damage and possible arcing and flame. Description Features Applications RoHS Compliant, Directive 2002/95/EC Lead-Free & Halogen-Free Low resistance Compatible with telecom standards Helps meets ITU K.20, K.21/Telcordia standards Excellent solder joint inspectability High voltage Customer Premises Equipment (CPE) Central Office (CO)/ telecom centers LAN/WAN equipment Access equipment 250S Series RoHS 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. AGENCY AGENCY FILE NUMBER E183209 R50120008 Additional Information Datasheet Samples Resources Samples

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