Resettable Ptc Products Page 104 Resettable PTC Products

POLY-FUSE Resettable PTCs 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 03/22/17 Radial Leaded > 250R Series The 250R Series is designed to protect against short duration high voltage fault currents (power cross or power induction surge) typically found in telecom applications (250Vrms). The series can be used to help telecom networking equipment meet the protection requirements specified in ITU K.20 and K.21. Electrical Characteristics Part Number I hold (A) I trip (A) V max V int / V op I max (A) P d typ. (W) Maximum Time To Trip Resistance Agency Approvals Current (A) Time (Sec.) R min ( ) R typ ( ) R 1max ( ) 250R080 0.08 0.16 250/60 3 1 0.35 4.0 14 22 33 X 250R080T 0.08 0.16 250/60 3 1 0.35 4.0 15 22 33 X 250R120 0.12 0.24 250/60 3 1 2.5 4 8 16 X 250R120-RA 0.12 0.24 250/60 3 1 2.5 7 9 16 X 250R120-RC 0.12 0.24 250/60 3 1 3.0 5.4 7.5 14 X 250R120-RF 0.12 0.24 250/60 3 1 2.5 6 10.5 16 X 250R120-R1 0.12 0.24 250/60 3 1 2.5 6 9 16 X 250R120-R2 0.12 0.24 250/60 3 1 2.5 8 10.5 16 X 250R120-R3 0.12 0.24 250/60 3 1 2.5 8 10 16 X 250R120T 0.12 0.24 250/60 3 1 2.5 7 12 16 X 250R145 0.145 0.29 250/60 3 1 2.5 3 6 14 X 250R145-RA 0.145 0.29 250/60 3 1 2.5 3 5.5 12 X 250R145-RB 0.145 0.29 250/60 3 1 2.5 4.5 6 14 X 250R145T 0.145 0.29 250/60 3 1 2.5 5.4 7.5 14 X 250R180 0.18 0.65 250/60 10 1.8 1 20 0.8 2.2 4 X 250R180T 0.18 0.65 250/60 10 1.8 1 21 1.4 3.9 4.5 X Items with T at end of part number = pre-tripped device. See Part Ordering Number System section of this data sheet for additional information. Description Features Applications 0.08 - 0.18 hold current range, 60VDC operating voltage 250VAC interrupt rating Fast time-to-trip Binned and sorted narrow resistance ranges available RoHS compliant, Lead- Free and Halogen-Free* Customer Premises Equipment (CPE) Central Office (CO)/ telecom centers LAN/WAN equipment Access equipment Agency Approvals 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 typ = Typical 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. * Effective January 1, 2010, all 250R PTC products will be manufactured Halogen Free (HF). Existing Non-Halogen Free 250R PTC products may continue to be sold, until supplies are depleted. RoHS * 250R Series AGENCY AGENCY FILE NUMBER E183209 R50120008

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