www.vishay.com for technical questions, contact: nlr@vishay.com document number: 29116 1 revision: 03-sep-10 ptcsslvt series/2381 671 914.. vishay bccomponents ptc thermistors, sleeve type for over-temperature protection features ? well-defined protection temperature levels ? 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 150 c) ? no need to reset supply after overtemperature switch ? small size and rugged ? also available as triple sensor ? compliant to rohs directive 2002/95/ec and in accordance to weee 2002/96/ec applications over-temperature/over-load protection: ? motor protection (thermal protection of winding) ? industrial electronics ? power supplies ? electronic data processing description these ptc thermistors consist of a small ptc ceramic chip soldered between 2 etfe insulated silver plated copper wires, insulated by a thermal sleeve. the are primarily intended for over-temperature sensing inside windings, coils, transformers and alike. packaging the ptc thermistors are packed in bulk per 500 pcs. component outlines dimensions in millimeters quick reference data parameter value unit maximum resistance at 25 c 100 ? minimum resistance at (t n + 15) c 4000 ? maximum (ac/dc) voltage 30 v thermal time constant ? 8.0 s temperature range - 40 to (t n + 15) c weight ? 2.0 g climatic category 40/125/56 - c/+ c/ days nominal working temperatures and ordering information nominal working temperature catalog and ordering number 12nc refrence number t n (c) r max. at t n - 5 c ( ? ) r min. at t n + 5 c ( ? ) sleeve device 2381 671 ..... 70 570 570 ptcsslvt071dbe 91402 80 550 1330 ptcsslvt081dbe 91403 90 550 1330 ptcsslvt091dbe 91404 100 550 1330 ptcsslvt101dbe 91405 110 550 1330 ptcsslvt111dbe 91406 120 550 1330 ptcsslvt121dbe 91407 130 550 1330 ptcsslvt131dbe 91409 140 550 1330 ptcsslvt141dbe 91412 150 550 1330 PTCSSLVT151DBE 91414 l3 l1 l4 d3 d2 d1 component outline l1 500 20 l2 7 2 l3 10 3 d1 0.42 d2 0.7 d3 3 max.
document number: 29116 for technical questions, contact: nlr@vishay.com www.vishay.com revision: 03-sep-10 2 ptcsslvt series/2381 671 914.. ptc thermistors, sleeve type for over-temperature protection vishay bccomponents typical resistance/temperature characteristic 10 100 1000 10 000 100 000 1 000 000 10 000 000 - 50 - 25 0 25 50 75 100 125 150 resistance ( ) temperat u re (c) 23 8 1 671 91404 ptcssl v t091dbe 23 8 1 671 91403 ptcssl v t0 8 1dbe 23 8 1 671 91402 ptcssl v t071dbe 10 100 1000 10 000 100 000 1 000 000 10 000 000 - 50 - 25 0 25 50 75 100 125 150 175 resistance ( ) temperat u re (c) 23 8 1 671 91407 ptcssl v t121dbe 23 8 1 671 91406 ptcssl v t111dbe 23 8 1 671 91405 ptcssl v t101dbe 10 100 1000 10 000 100 000 1 000 000 - 50 - 25 0 25 50 75 100 125 150 175 200 resistance ( ) temperat u re (c) 23 8 1 671 91414 ptcssl v t151dbe 23 8 1 671 91412 ptcssl v t141dbe 23 8 1 671 91409 ptcssl v t131dbe
www.vishay.com for technical questions, contact: nlr@vishay.com document number: 29116 3 revision: 03-sep-10 ptcsslvt series/2381 671 914.. vishay bccomponents ptc thermistors, sleeve type for over-temperature protection application specific data negative temperature coefficient (ntc) thermistors are well known 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 principles are similar, the applications are very different; whereas ntc thermistors sense and measure temperature over a defined ra nge, ptc thermistors switch at one 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 expensive than a thermostat, and its switch temperature can be more accurately specified. it is also smaller and easier to design-in to electronic circuitry. so how does it work? the ptc thermistor is mounted in thermal contact with the equipme nt to be protected, and connected into the bridge arm of a comparator circuit, such as shown in fig. 1. at normal temperature, the ptc thermistor resistance (r p ) is lower than r s (see fig. 2), so the comparator's output voltage v o will be low. if an equipment overtemperature 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 o to switch to a high level sufficient to activate an alarm, relay or power shutdown circuit. application examples fig. 1 typical comparator circuit f ig. 2 typical switch characteristic as soon as one or more of the windings becomes too hot, the motor is switched off. fig. 3 temperature protection of electric motors ptc thermistor r p r l r f r s r1 r2 v o trigger temperat u re t n v o r p r s (r1 = r2) t (c) r p r s (r1 = r2)
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