www.vishay.com for technical questions, contact: nlr@vishay.com document number: 29012 60 revision: 08-jun-09 2381 671 911../ptcsl..t....be vishay bccomponents ptc thermistors, mini radial leaded for over-temperature protection features ? well-defined protection temperature levels ? fast reaction time (< 15 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 150 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. quick reference data parameter value unit maximum resistance at 25 c 100 minimum resistance at (t n + 15) c 4000 maximum voltage 30 v temperature range - 20 to (t n + 15) c weight: 91102 to 91114 0.08 g 91152 to 91164 0.11 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 ) leaded device color code normal leads long leads 70 30 to 250 50 to 570 0.570 to 50 91102 91152 black 80 30 to 250 50 to 550 1.33 to 50 91103 91153 brown 90 30 to 250 50 to 550 1.33 to 50 91104 91154 red 100 30 to 250 50 to 550 1.33 to 50 91105 91155 orange 110 30 to 250 50 to 550 1.33 to 50 91106 91156 yellow 120 30 to 250 50 to 550 1.33 to 50 91107 91157 green 130 30 to 250 50 to 550 1.33 to 50 91109 91159 blue 140 30 to 250 50 to 550 1.33 to 50 91112 91162 violet 150 30 to 250 50 to 550 1.33 to 50 91114 91164 grey
document number: 29012 for technical questions, contact: nlr@vishay.com www.vishay.com revision: 08-jun-09 61 2381 671 911../ptcsl..t....be ptc thermistors, mi ni radial leaded for over-temperature protection vishay bccomponents component outlines dimensions in millimeters 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 12nc sap spq 2381 671 91102 ptcsl20t071dbe 2381 671 91152 ptcsl40t071dbe 500 2381 671 91103 ptcsl20t081dbe 2381 671 91153 ptcsl40t081dbe 500 2381 671 91104 ptcsl20t091dbe 2381 671 91154 ptcsl40t091dbe 500 2381 671 91105 ptcsl20t101dbe 2381 671 91155 ptcsl40t101dbe 500 2381 671 91106 ptcsl20t111dbe 2381 671 91156 ptcsl40t111dbe 500 2381 671 91107 ptcsl20t121dbe 2381 671 91157 ptcsl40t121dbe 500 2381 671 91109 ptcsl20t131dbe 2381 671 91159 ptcsl40t131dbe 500 2381 671 91112 ptcsl20t141dbe 2381 671 91162 ptcsl40t141dbe 500 2381 671 91114 PTCSL20T151DBE 2381 671 91164 ptcsl40t151dbe 500 ? 0.4 3.0 max. 2.54 20.0 2 3.5 max. 7.0 max. 0.5 min. component outline for 91102 to 91114 ? 0.4 3.0 max. 2.54 40.0 min. 3.5 max. 7.0 ma x. 0.5 mi n. component outline for 91152 to 91164
www.vishay.com for technical questions, contact: nlr@vishay.com document number: 29012 62 revision: 08-jun-09 2381 671 911../ptcsl..t....be vishay bccomponents ptc thermistors, mini radial leaded for over-temperature protection typical resistance/temperature characteristic for 2381 671 91105/91106 and 91107 typical resistance/temperature characteristic for 2381 671 91102/91103 and 91104 typical resistance/temperature characteristic for 2381 671 91109 typical resistance/temperature characteristic for 2381 671 91112 and 91114 10 10 2 10 3 10 4 0 50 100 150 200 250 10 6 10 5 t n = 120 c 1.5 v (dc) max. t n = 110 c t n = 100 c resistance ( ) temperature (c) 10 10 2 10 3 10 4 0 50 100 150 200 250 10 6 10 5 t n = 90 c 1.5 v (dc) max. t n = 70 c t n = 80 c resistance ( ) temperature (c) 10 10 2 10 3 10 4 0 50 100 150 200 250 10 6 10 5 1.5 v (dc) max. t n = 130 c resistance ( ) temperat u re (c) 10 10 2 10 3 10 4 0 50 100 150 200 250 10 6 10 5 t n = 140 c 1.5 v (dc) max. t n = 150 c resistance ( ) temperat u re (c)
document number: 29012 for technical questions, contact: nlr@vishay.com www.vishay.com revision: 08-jun-09 63 2381 671 911../ptcsl..t....be ptc thermistors, mi ni radial leaded 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. so how does it work? the ptc thermistor is mounted in thermal contact with the equipment to be protected, and connected into the bridge arm of a comparator circuit, such as shown in fig. 1. at normal temp erature, the ptc the rmistor resistance (r p ) is lower than r s (see fig. 2), so the co mparator's output voltage v o will be low. if an equipment overtemperature occurs, the ptc thermistor will quickly heat up to its tri gger 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 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) ptc thermistor r p r l r f r s r1 r2 + v o fig. 2 typical switch characteristic fig. 1 typical comparator circuit fig. 3 temperature protection of electric motors
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