www.vishay.com for technical questions, contact: nlr@vishay.com document number: 29115 1 revision: 18-jun-09 2381 671 913../ptcsscwt...dbe vishay bccomponents ptc thermistors, screw type for over-temperature protection features ? well-defined protection temperature levels with low thermal gradient between thermal body and sensing temperature ? 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 ? 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 description these positive temperature coef ficient thermistors consist of a small ceramic chip reflow-soldered between two awg#30 wires with peek insulation and potted inside a passivated aluminum screw head. quick reference data parameter value unit maximum resistance at 25 c 100 minimum resistance at (t n + 15) c 4000 maximum voltage 30 v thermal time constant 8.0 s temperature range - 40 to (t n +15) c min. dielectric withstanding voltage between leads-end and screw 500 v ac weight 2.0 g climatic category 40/155/56 nominal working temperatures and ordering information nominal working temperature catalog number 2381 671 ..... t n (c) r max. at t n - 5 c ( ) r min. at t n + 5 c ( ) screw device 70 570 570 91302 80 550 1330 91303 90 550 1330 91304 100 550 1330 91305 110 550 1330 91306 120 550 1330 91207 130 550 1330 91309 140 550 1330 91312 150 550 1330 91314 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 + 5) c see nominal working temperatures and ordering information table minimum resistance at (t n + 15) c 4000 maximum voltage 30 v (ac or dc)
document number: 29115 for technical questions, contact: nlr@vishay.com www.vishay.com revision: 18-jun-09 2 2381 671 913../ptcsscwt...dbe ptc thermistors, screw type for over-temperature protection vishay bccomponents component outlines dimensions in millimeters typical resistance/temperature characteristic catalog numbers and packaging 12nc sap spq 2381 671 91302 ptcsscwt071dbe 500 2381 671 91303 ptcsscwt081dbe 500 2381 671 91304 ptcsscw3t091dbe 500 2381 671 91305 ptcsscwt101dbe 500 2381 671 91306 ptcsscw3t111dbe 500 2381 671 91307 ptcsscwt121dbe 500 2381 671 91309 ptcsscwt131dbe 500 2381 671 91312 ptcsscwt141dbe 500 2381 671 91314 PTCSSCWT151DBE 500 l5 8 l3 l2 l1 l4 m dd component outline for 2381 671 91302 to 91314 l1 200 20 l2 14.5 l3 8 l4 3 l5 5.5 (m4) m m4 - 0.70 - 6g (iso) d 0.254 d0.56 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 91304 ptcssc w t091dbe 23 8 1 671 91303 ptcssc w t0 8 1dbe 23 8 1 671 91302 ptcssc w 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 91307 ptcssc w t121dbe 23 8 1 671 91306 ptcssc w t111dbe 23 8 1 671 91305 ptcssc w t101dbe
www.vishay.com for technical questions, contact: nlr@vishay.com document number: 29115 3 revision: 18-jun-09 2381 671 913../ptcsscwt...dbe vishay bccomponents ptc thermistors, screw type for over-temperat ure 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 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 91314 ptcssc w t151dbe 23 8 1 671 91312 ptcssc w t141dbe 23 8 1 671 91309 ptcssc w t131dbe fig. 1 typical comparator circuit f ig. 2 typical switch characteristic 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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