www.vishay.com for technical questions, contact: nlr@vishay.com document number: 29017 56 revision: 27-oct-10 ptcsc..t....be/2381 671 910.. vishay bccomponents ptc thermistors, mini chips for over-temperature protection features ? well-defined protection temperature levels ? fast reaction time (< 6 s in still air) ? accurate resistance for ease of circuit design ? excellent long term behavior (< 1 c or 5 % after 1000 h at t n + 15 c) ? wide range of protection temperatures (70 c to 170 c) ? no need to reset supply after overtemperature switch ? small size and rugged ? coated leaded and naked devices available ? compliant to rohs directive 2002/95/ec and in accordance to weee 2002/96/ec applications over-temperature protection and control in: ? industrial electronics ? power supplies ? electronic data processing ? motor protection description these directly heated thermistors have a positive temperature coefficient and are primarily intended for sensing. note (1) naked chips are packed in a her metically-sealed alu-plastic bag quick reference data parameter value unit maximum resistance at 25 c 100 minimum resistance at ( t n + 15) c 4000 maximum (dc) voltage 30 v temperature range - 20 to ( t n + 15) c weight 0.006 g climatic category 25/125/56 nominal working temperatures and ordering information nominal working temperature catalog number 2381 671 ..... t n (c) resistance from - 20 c to t n - 20 c ( ) resistance at t n - 5 c ( ) resistance at t n + 5 c (k ) naked chip (1) 1.7 x 1.7 (mm) 70 30 to 250 50 to 570 0.57 to 50 91002 80 30 to 250 50 to 550 1.33 to 50 91003 90 30 to 250 50 to 550 1.33 to 50 91004 100 30 to 250 50 to 550 1.33 to 50 91005 110 30 to 250 50 to 550 1.33 to 50 91006 120 30 to 250 50 to 550 1.33 to 50 91007 130 30 to 250 50 to 550 1.33 to 50 91009 140 30 to 250 50 to 550 1.33 to 50 91012 150 30 to 250 50 to 550 1.33 to 50 91014 155 30 to 250 50 to 550 1.33 to 50 91015 160 30 to 250 50 to 550 1.33 to 50 91016 170 30 to 250 50 to 550 1.33 to 50 91017
document number: 29017 for technical questions, contact: nlr@vishay.com www.vishay.com revision: 27-oct-10 57 ptcsc..t....be/2381 671 910.. ptc thermistors, mini chips for over-temperature protection vishay bccomponents electrical characteristics parameter values maximum resistance at 25 c 100 maximum resistance at ( t n - 5) c see nominal working temperatures and ordering information table minimum resistance at ( t n + 15) c 4000 minimum resistance at ( t n +5) c see nominal working temperatures and ordering information table maximum voltage 30 v (ac or dc) catalog numbers and packaging 12nc sap spq 2381 671 91002 ptcsc17t071dbe 5000 2381 671 91003 ptcsc17t081dbe 5000 2381 671 91004 ptcsc17t091dbe 5000 2381 671 91005 ptcsc17t101dbe 5000 2381 671 91006 ptcsc17t111dbe 5000 2381 671 91007 ptcsc17t121dbe 5000 2381 671 91009 ptcsc17t131dbe 5000 2381 671 91012 ptcsc17t141dbe 5000 2381 671 91014 ptcsc17t151dbe 5000 2381 671 91015 ptcsc17t155dbe 5000 2381 671 91016 ptcsc17t161dbe 5000 2381 671 91017 ptcsc17t171dbe 5000 component outlines dimensions in millimeters for clamping, reflow or hand soldering. not intended for either wave or ultras onic soldering and not for spot welding. all standard solder alloys with low activated halogene-fr ee fluxes are acceptable, for example: 62sn/36pb/2ag. 1.7 0.15 0.8 0.1 1.7 0.15 component outline for 91002 to 91017
www.vishay.com for technical questions, contact: nlr@vishay.com document number: 29017 58 revision: 27-oct-10 ptcsc..t....be/2381 671 910.. vishay bccomponents ptc thermistors, mini chips for over-temperature protection typical resistance/temperature characteristic for 2381 671 91002, 2381 671 91003 and 2381 671 91004 typical resistance/temperature characteristic for 2381 671 91005, 2381 671 91006 and 2381 671 91007 typical resistance/temperature characteristic for 2381 671 91009, 2381 671 91012 and 2381 671 91014 typical resistance/temperature characteristic for 2381 671 91015, 2381 671 91016 and 2381 671 91017 10 3 10 4 10 5 10 6 10 2 10 50 0 100 150 200 250 t n = 90 c 1.5 v (dc) max. t n = 70 c t n = 8 0 c resistance ( ) temperat u re (c) t n = 100 c t n = 110 c t n = 120 c 10 3 10 4 10 5 10 6 10 2 10 50 0 100 150 200 250 1.5 v (dc) max. resistance ( ) temperat u re (c) t n = 145 c t n = 140 c t n = 150 c 10 3 10 4 10 5 10 6 10 2 10 50 0 100 150 200 250 resistance ( ) temperat u re (c) 1.5 v (dc) max. t n = 160 c t n = 155 c t n = 170 c 10 3 10 4 10 5 10 6 10 2 10 50 0 100 150 200 250 resistance ( ? ) temperature (c) 1.5 v (dc) max.
document number: 29017 for technical questions, contact: nlr@vishay.com www.vishay.com revision: 27-oct-10 59 ptcsc..t....be/2381 671 910.. ptc thermistors, mini chips for over-temperature protection vishay bccomponents application specific data negative temperature coefficient (ntc) thermistors are well know n for temperature sensing. what is not well known, however, is that positive temperature coefficient (ptc) thermistors can be used for thermal protection. although their operating princip les are similar, the applications are very different; whereas nt c thermistors sense and measure temperature over a defined range, ptc thermistors switch at on e particular temperature. just like thermostats they protect such equipment and components as motors, transformers, power transistors and thyristors against overtemperature. a ptc thermistor is less expensiv e than a thermostat, and its sw itch temperature can be more accurately specified. it is also smaller and easier to design-in to electronic circuitry. the ptc thermistor is mounted in thermal c ontact with the equipment to be protected, and connected into the bridge arm of a comparator circuit, such as shown in fig. 1. at normal temperature, the pt c thermistor resistance ( r p ) is lower than r s (see fig. 2), so the comparat or?s output voltage v 0 will be low. if an equipment overtemperatur e occurs, the ptc thermistor will quickly heat up to its trigger or nominal reference temperature t n , whereupon its resistance will increase to a value much higher than r s , causing v 0 to switch to a high level su fficient to activate an alarm, relay or power shutdown circuit. application examples as soon as one or more of the windings becomes too hot, the motor is switched off. + + + trigger temperature t n v o t (c) r p > r s (r1 = r2) r p < r s (r1 = r2) fig. 2 typical switch characteristic fig. 1 typical comparator circuit fig. 3 temperature protection of electric motors ptc thermistor r p r l r f r s r1 r2 + ? v o
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