www.vishay.com for technical questions, contact: nlr@vishay.com document number: 29018 64 revision: 30-jul-10 2381 671 912../ptcsg..t....be vishay bccomponents ptc thermistors, lug sensors for over-temperature protection features ? well-defined protection 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) ? 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 (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 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 ( ) lug device 70 570 570 91202 80 550 1330 91203 90 550 1330 91204 100 550 1330 91205 110 550 1330 91206 120 550 1330 91207 130 550 1330 91209 140 550 1330 91212 150 550 1330 91214 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: 29018 for technical questions, contact: nlr@vishay.com www.vishay.com revision: 30-jul-10 65 2381 671 912../ptcsg..t....be ptc thermistors, lug sensors for over-temperature protection vishay bccomponents component outlines dimensions in millimeters typical resistance/temper ature characteristic catalog numbers and packaging 12nc sap spq 2381 671 91202 ptcsgm3t071dbe 200 2381 671 91203 ptcsgm3t081dbe 200 2381 671 91204 ptcsgm3t091dbe 200 2381 671 91205 ptcsgm3t101dbe 200 2381 671 91206 ptcsgm3t111dbe 200 2381 671 91207 ptcsgm3t121dbe 200 2381 671 91209 ptcsgm3t131dbe 200 2381 671 91212 ptcsgm3t141dbe 200 2381 671 91214 PTCSGM3T151DBE 200 0.145 [3.6 8 ] dia. hole 0.64 [16.26] max. 0.04 [1.016] 0.2 8 1 [7.14] 1.496 0.157 [3 8 4] 0.157 0.039 [4 1] component outline for 2381 671 91202 to 91214 10 100 1000 10 000 100 000 1 000 000 10 000 000 - 50 - 25 0 25 50 75 100 125 150 resistance ( ) te m p e r a t u re (c) 23 8 1 671 91204 ptcsgm3t091dbe 23 8 1 671 91203 ptcsgm3t0 8 1dbe 23 8 1 671 91202 ptcsgm3t071dbe 10 100 1000 10 000 100 000 1 000 000 10 000 000 - 50 - 25 0 25 50 75 100 125 150 175 resistance ( ) te m p e r a t u re (c) 23 8 1 671 91207 ptcsgm3t121dbe 23 8 1 671 91206 ptcsgm3t111dbe 23 8 1 671 91205 ptcsgm3t101dbe
www.vishay.com for technical questions, contact: nlr@vishay.com document number: 29018 66 revision: 30-jul-10 2381 671 912../ptcsg..t....be vishay bccomponents ptc thermistors, lug sensors for over-temperature protection application specific data negative temperature coefficient (ntc) thermistors are well known for temperatur e sensing. what is not well known, however, is that positive temperature co efficient (ptc) thermistors can be used for thermal protection. although their operating princip les are similar, the applications are very di fferent; whereas ntc thermi stors sense and measure tem perature over a defined range, ptc thermistors switch at one particular temperature. just like thermostats they protect such equipment and compone nts as motors, transformers, po wer transistors and thyristors against overtemperature. a ptc thermistor is less expensive than a thermost at, and its switch te mperature can be more accurately specified. it is also smaller a nd easier to design-in to electronic circuitry. so how does it work? the ptc thermistor is mounted in thermal contact with the equip ment to be protected, and connected into the bridge arm of a comparator circuit, such as shown in fi g. 1. at normal temperature, t he 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 tr igger 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 10 100 1000 10 000 100 000 1 000 000 - 50 - 25 0 25 50 75 100 125 150 175 200 resistance ( ) te m p e r a t u re (c) 23 8 1 671 91214 PTCSGM3T151DBE 23 8 1 671 91212 ptcsgm3t141dbe 23 8 1 671 91209 ptcsgm3t131dbe 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)
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