radial lead resettable polymer ptcs revision september 12, 2013 1 / 4 @ socay electronics co., ltd. 2013 specifications are subject to change without notice. please refer to www.socay.com for current information. sc250 series socay electronics co., ltd. www.socay.com the sc250 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 speci ? ed in itu k.20 and k.21. u 0.08-0.18a hold current range u 250vac interrupt rating u fast time-to-trip u binned and shorted narrow resistance ranges available u rohs compliant, lead-free and halogen-free u customer premises equipment (cpe) u central office (co) / telecom centers u power ports u lan / wan equipment u access equipment maximum time to trip resistance part number i hold (a) i trip (a) v maxi (vac) i max (a) p dtyp. (w) current (a) time (sec.) r min (m ) r max (m ) r 1max (m ) SC250-080 0.08 0.16 250 3.0 0.8 0.35 4.0 11.0 22.0 33.0 sc250-090 0.09 0.18 250 3.0 0.8 0.35 5.0 9.0 18.0 27.0 sc250-110 0.11 0.22 250 3.0 1.0 1.00 0.75 6.0 12.0 16.0 sc250-120 0.12 0.24 250 3.0 1.0 1.00 1.50 4.0 8.0 16.0 sc250-120t 0.12 0.24 250 3.0 1.0 1.00 0.75 6.0 12.0 16.0 sc250-145 0.145 0.29 250 3.0 1.0 1.00 2.50 3.0 6.0 14.0 sc250-145t 0.145 0.29 250 3.0 1.0 1.00 1.50 4.5 9.0 14.0 sc250-180c 0.18 0.65 250 10.0 1.5 3.00 0.50 1.6 3.2 4.0 sc250-180s 0.18 0.65 250 10.0 1.5 3.00 0.50 1.6 3.2 4.0 i hold = hold current: maximum current device will pass without tripping in 25 c still air. i trip = trip current: minimum current at which the device will trip in 25 c still air. v maxi = maximum voltage that can be safely placed across a device in its tripped state under specified fault conditions. i max = maximum fault current device can withstand without damage at rated voltage (v max ) p dtyp. = power dissipated from device when in the tripped state at 25 c 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 25 c measured one hour after tripping. caution: operation beyond the speci ? ed rating may result in damage and possible arcing and flame. description features electrical parameters applicable
radial lead resettable polymer ptcs revision september 12, 2013 2 / 4 @ socay electronics co., ltd. 2013 specifications are subject to change without notice. please refer to www.socay.com for current information. sc250 series socay electronics co., ltd. www.socay.com ambient operation temperature -40 c -20 c 0 c 25 c 40 c 50 c 60 c 70 c 85 c part number hold current (a) SC250-080 0.124 0.110 0.095 0.080 0.066 0.059 0.051 0.044 0.033 sc250-090 0.140 0.124 0.107 0.090 0.074 0.066 0.058 0.050 0.037 sc250-110 0.171 0.151 0.131 0.110 0.091 0.081 0.071 0.061 0.046 sc250-120 0.186 0.165 0.143 0.120 0.099 0.088 0.077 0.066 0.050 sc250-120t 0.186 0.165 0.143 0.120 0.099 0.088 0.077 0.066 0.050 sc250-145 0.225 0.199 0.172 0.145 0.119 0.106 0.093 0.080 0.060 sc250-145t 0.225 0.199 0.172 0.145 0.119 0.106 0.093 0.080 0.060 sc250-180c 0.279 0.247 0.213 0.180 0.147 0.131 0.115 0.099 0.074 sc250-180s 0.279 0.247 0.213 0.180 0.147 0.131 0.115 0.099 0.074 a=SC250-080/sc250-090 b=sc250-110 c=sc250-120/sc250-120t d=sc250-145/sc250-145t e=sc250-180/sc250-180c temperature rera ting chart C i hold (a) temperature rerating curve average time current curves time in seconds current in amperes percentage of rated current temperature ( c)
radial lead resettable polymer ptcs revision september 12, 2013 3 / 4 @ socay electronics co., ltd. 2013 specifications are subject to change without notice. please refer to www.socay.com for current information. sc250 series socay electronics co., ltd. www.socay.com test test conditions accept/reject criteria resistance in still air @25 2 c r min r r max hold current 60 min, at i hold , in still air @25 2 c no trip time to trip specified current, v max , @25 2 c t maximum time to trip frequency current withstand 220v / i max, 20 cycle resistance of the variation of the poor value: 30% failure mode v maxi / 5a, 60 minute no buming pre-heating zone refer to the condition recommended by the manufacturer. max. ramping rate should not exceed 4 c/sec soldering zone max. solder temperature should not exceed 260 c cooling zone cooling by natural convection in air lead material tin-plated copper soldering characteristics solder ability per mil-std-202, method 208e insulating material cured, ? ame retardant epoxy polymer meets ul 94v-0 requirements. device labeling marked with sc , voltage, current rating soldering parameters t est procedures and requirement part numbering part marking physical specifications
radial lead resettable polymer ptcs revision september 12, 2013 4 / 4 @ socay electronics co., ltd. 2013 specifications are subject to change without notice. please refer to www.socay.com for current information. sc250 series socay electronics co., ltd. www.socay.com figure1 figure2 a b c d lead (dia) inches mm inches mm inches mm inches mm part number figure max. max. max. max. typ. typ. max. max. inches mm packaging (bulk pack) SC250-080 figure1 0.236 6.0 0.394 10.0 0.200 5.1 0.181 4.6 0.024 0.6 1000 sc250-090 figure1 0.236 6.0 0.394 10.0 0.200 5.1 0.181 4.6 0.024 0.6 1000 sc250-110 figure2 0.256 6.5 0.413 10.5 0.200 5.1 0.181 4.6 0.024 0.6 1000 sc250-120 figure2 0.256 6.5 0.413 10.5 0.200 5.1 0.181 4.6 0.024 0.6 1000 sc250-120t figure2 0.256 6.5 0.413 10.5 0.200 5.1 0.181 4.6 0.024 0.6 1000 sc250-145 figure2 0.276 7.0 0.433 11.0 0.200 5.1 0.181 4.6 0.024 0.6 1000 sc250-145t figure2 0.276 7.0 0.433 11.0 0.200 5.1 0.181 4.6 0.024 0.6 1000 sc250-180c figure1 0.374 9.5 0.531 13.5 0.200 5.1 0.150 3.8 0.024 0.6 1000 sc250-180s figure2 0.346 8.8 0.504 12.8 0.200 5.1 0.150 3.8 0.024 0.6 1000 u this product should not be used in an application where the maximum interrupt voltage or maximum interrupt current in a fault condition, operation beyond the maximum rating or improper use may result in device damage and possible electrical arcing and flame. u a pptc device is not a fuse, it is a nonlinear thermistor that limits current, because under a fault condition all pptc devices go into a high resistance state but not open circuit hazardous voltage may be present at pptc. u the devices are intended for protection against occasional over-current or over-temperature fault conditions and should not be used when repeated fault conditions or prolonged trip events. u in most application, power must be removed and the fault condition cleared in order to reset a pptc device. u pptc devices are not recommended to be installed in applications where the device is constrained such that its pptc properties are inhibited, for example in rigid potting materials or add devices surface coating, bundled devices ontology, which lack adequate clearance to accommodate device expansion. u contamination on of the pptc material with certain silicone-based oils or some aggressive solvents can adversely impact the performance of the devices. for example, organic solvents to cleaning. dimensions warning
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