ptcsl20 series www.vishay.com vishay bccomponents revision: 04-dec-15 1 document number: 29012 for technical questions, contact: nlr@vishay.com this document is subject to change without notice. the products described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 ptc thermistors, mini radial leaded for over-temperature protection non preferred type (replaced by ptcsl03) note (1) max operating temperature range is t n +15 c, indicated value is for t n = 150 c. features ? well-defined protecti on 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) ? small size and rugged ? material categorization: fo r definitions of compliance please see www.vishay.com/doc?99912 applications over-temperature protect ion and control in: ? industrial electronics ? power supplies ? motor protection description these ptc sensing thermistors consist of a medium resistivity doped batio3 cer amic chip lead (pb)-free soldered with nickel wires and coated with a high temperature silicone lacquer and color coding band. packaging ptc thermistors are available in 500 pieces bulk packed. note (2) parts with total length of 40 mm availa ble as ptcsl40t...dbe catalog numbers. quick reference data parameter value unit resistance at 25 c ( r 25 ) 20 to 100 nominal working temperature (t n ) 70 to 150 c tolerance on t n 5 c maximum voltage (ac or dc) 30 v operating temperature range (1) -20 to 165 c dissipation factor 5 mw/k storage temperature -25 to +155 c component outlines dimensions in millimeters ptcsl20t..., l = 20 2 ptcsl40t..., l = 40 min. nominal working temperatures and ordering information nominal working temp. 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 ) min. resistance at t n ?+15?c (k ) color code ordering part numbers (2) 70 20?to?250 50?to?570 0.570?to?50 4 black ptcsl20t071dbe 80 20?to?250 50?to?550 1.33?to?50 4 brown ptcsl20t081dbe 90 20?to?250 50?to?550 1.33?to?50 4 red ptcsl20t091dbe 100 20?to?250 50?to?550 1.33?to ?50 4 orange ptcsl20t101dbe 110 20?to?250 50?to?550 1.33?to?50 4 yellow ptcsl20t111dbe 120 20?to?250 50?to?550 1.33?to ?50 4 green PTCSL20T121DBE 130 20?to?250 50?to?550 1.33?to?50 4 blue ptcsl20t131dbe 140 20?to?250 50?to?550 1.33?to?50 4 violet ptcsl20t141dbe 150 20?to?250 50?to?550 1.33?to?50 4 grey ptcsl20t151dbe ? 0.4 3.0 max. 2.5 l 3.5 max. 7.0 max. 0.5 min.
ptcsl20 series www.vishay.com vishay bccomponents revision: 04-dec-15 2 document number: 29012 for technical questions, contact: nlr@vishay.com this document is subject to change without notice. the products described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 typical resistance/temperature characteristic for t n 100 c to 120 c typical resistance/temperature characteristic for t n 70 c to 90 c typical resistance/temperature characteristic for t n 130 c typical resistance/temperature characteristic for t n 140 c and 150 c 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)
ptcsl20 series www.vishay.com vishay bccomponents revision: 04-dec-15 3 document number: 29012 for technical questions, contact: nlr@vishay.com this document is subject to change without notice. the products described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 application specific data negative temperature coefficient (ntc) ther mistors are well known for te mperature 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 appl ications are very different; whereas ntc ther mistors sense and measure temperature over a defined range, ptc thermistors swit ch at one particular temperature. just like thermostats they protect such equipment and componen ts as motors, transformers, power transistors and thyristors against over temperature. 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 therma l contact with the equipment to be protected, and connected into the bridge arm of a comparato r circuit, such as shown in fig. 1. at norma l temperature, the ptc thermistor resistance (r p ) is lower than r s (see fig. 2), so the comparators output voltage v o will be low. if an equipmen t over temperature occurs, the ptc thermistor will quickly heat up to it s trigger or nominal re ference temperature t n , whereupon its resist ance will increase to a value much higher than r s , causing v o to switch to a high level sufficient to acti vate an alarm, relay or power shutdown circuit. application examples fig. 1 - typical comparator circuit fig. 2 - typical switch characteristic fig. 3 - temperature protection of 3-phase electric motor ptc thermistor r p r l r f r s r1 r2 + ? v o trigger temperature t n v o t (c) r p > r s (r1 = r2) r p < r s (r1 = r2) + + + a s s oon a s one or more of the winding s become s too hot, the motor i s s witched off.
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