ptcsgm3 www.vishay.com vishay bccomponents revision: 15-dec-15 1 document number: 29018 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, lug sensors for over-temperature protection 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 (< 30 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 electronics ? motor protection description these ptc sensing thermistors consist of a medium resistivity doped batio 3 ceramic chip lead (pb)-free soldered with awg#24 ptfe insulated stranded and tinned copper wires and mounted in a metal lug barrel. the lug barrel is marked with the tn value (ex t120). packaging ptc thermistors are available in 200 pieces bulk packed. 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 thermal time constant ~ 8 s operating temperature range (1) -20 to 165 c dissipation factor 5 mw/k storage temperature -25 to +155 c weight ~ 2 g nominal working temperatures and ordering information nominal working temperature t n (c) r max. at t n - 5 c ( ) r min. at t n + 5 c ( ) r min. at t n + 15 c ( ) ordering part numbers lug device 70 570 570 4000 PTCSGM3T071DBE 80 550 1330 4000 ptcsgm3t081dbe 90 550 1330 4000 ptcsgm3t091dbe 100 550 1330 4000 ptcsgm3t101dbe 110 550 1330 4000 ptcsgm3t111dbe 120 550 1330 4000 ptcsgm3t121dbe 130 550 1330 4000 ptcsgm3t131dbe 140 550 1330 4000 ptcsgm3t141dbe 150 550 1330 4000 ptcsgm3t151dbe component outlines dimensions in inches (millimeters) 0.145 [3.68] dia. hole 0.64 [16.26] max. 0.04 [1.016] 0.281 [7.14] 1.496 0.157 [38 4] 0.157 0.039 [4 1]
ptcsgm3 www.vishay.com vishay bccomponents revision: 15-dec-15 2 document number: 29018 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 typcial resistance/temperature characteristic 10 1 10 2 10 3 10 4 10 5 10 6 10 7 -50 -25 0 25 50 75 100 125 150 resistance ( ) temperature (c) ptcsgm3t091dbe ptcsgm3t081dbe PTCSGM3T071DBE 10 1 10 2 10 3 10 4 10 5 10 6 10 7 -50 -25 0 25 50 75 100 125 150 175 resistance ( ) temperature (c) ptcsgm3t121dbe ptcsgm3t111dbe ptcsgm3t101dbe 10 1 10 2 10 3 10 4 10 5 10 6 -50 -25 0 25 50 75 100 125 150 175 200 resistance ( ) temperature (c) ptcsgm3t151dbe ptcsgm3t141dbe ptcsgm3t131dbe
ptcsgm3 www.vishay.com vishay bccomponents revision: 15-dec-15 3 document number: 29018 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 ptc thermistor r p r l r f r s r1 r2 + ? v o trigger temperat u re t n v o t (c) r p > r s (r1 = r2) r p < r s (r1 = r2)
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