PTCSC..T....BE/2381 671 910.. Vishay BCcomponents PTC Thermistors, Mini Chips for Over-Temperature Protection FEATURES * * * * * QUICK REFERENCE DATA PARAMETER VALUE UNIT Maximum resistance at 25 C 100 Minimum resistance at (Tn + 15) C 4000 30 V - 20 to (Tn + 15) C 0.006 g Maximum (DC) voltage Temperature range Weight Climatic category 25/125/56 * * * * Well-defined protection temperature levels Fast reaction time (< 6 s in still air) Accurate resistance for ease of circuit design Excellent long term behavior (< 1 C or 5 % after 1000 h at Tn + 15 C) Wide range of protection temperatures (70 C to 170 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 accordance to WEEE 2002/96/EC in 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. NOMINAL WORKING TEMPERATURES AND ORDERING INFORMATION NOMINAL WORKING TEMPERATURE CATALOG NUMBER 2381 671 ..... Tn (C) RESISTANCE from - 20 C to Tn - 20 C () RESISTANCE at Tn - 5 C () RESISTANCE at Tn + 5 C (k) NAKED CHIP (1) 70 30 to 250 50 to 570 0.57 to 50 91002 80 30 to 250 50 to 550 1.33 to 50 91003 90 30 to 250 50 to 550 1.33 to 50 91004 100 30 to 250 50 to 550 1.33 to 50 91005 110 30 to 250 50 to 550 1.33 to 50 91006 120 30 to 250 50 to 550 1.33 to 50 91007 130 30 to 250 50 to 550 1.33 to 50 91009 140 30 to 250 50 to 550 1.33 to 50 91012 150 30 to 250 50 to 550 1.33 to 50 91014 155 30 to 250 50 to 550 1.33 to 50 91015 160 30 to 250 50 to 550 1.33 to 50 91016 170 30 to 250 50 to 550 1.33 to 50 91017 1.7 x 1.7 (mm) Note (1) Naked chips are packed in a hermetically-sealed alu-plastic bag www.vishay.com 56 For technical questions, contact: nlr@vishay.com Document Number: 29017 Revision: 27-Oct-10 PTCSC..T....BE/2381 671 910.. PTC Thermistors, Mini Chips for Over-Temperature Protection Vishay BCcomponents ELECTRICAL CHARACTERISTICS PARAMETER VALUES 100 Maximum resistance at 25 C Maximum resistance at (Tn - 5) C See Nominal Working Temperatures and Ordering Information table Minimum resistance at (Tn + 15) C 4000 Minimum resistance at (Tn + 5) C See Nominal Working Temperatures and Ordering Information table Maximum voltage 30 V (AC or DC) CATALOG NUMBERS AND PACKAGING 12NC SAP SPQ 2381 671 91002 PTCSC17T071DBE 5000 2381 671 91003 PTCSC17T081DBE 5000 2381 671 91004 PTCSC17T091DBE 5000 2381 671 91005 PTCSC17T101DBE 5000 2381 671 91006 PTCSC17T111DBE 5000 2381 671 91007 PTCSC17T121DBE 5000 2381 671 91009 PTCSC17T131DBE 5000 2381 671 91012 PTCSC17T141DBE 5000 2381 671 91014 PTCSC17T151DBE 5000 2381 671 91015 PTCSC17T155DBE 5000 2381 671 91016 PTCSC17T161DBE 5000 2381 671 91017 PTCSC17T171DBE 5000 COMPONENT OUTLINES DIMENSIONS in millimeters 0.8 0.1 1.7 0.15 1.7 0.15 Component outline for 91002 to 91017 For clamping, reflow or hand soldering. Not intended for either wave or ultrasonic soldering and not for spot welding. All standard solder alloys with low activated halogene-free fluxes are acceptable, for example: 62Sn/36Pb/2Ag. Document Number: 29017 Revision: 27-Oct-10 For technical questions, contact: nlr@vishay.com www.vishay.com 57 PTCSC..T....BE/2381 671 910.. PTC Thermistors, Mini Chips for Over-Temperature Protection Vishay BCcomponents TYPICAL RESISTANCE/TEMPERATURE CHARACTERISTIC FOR 2381 671 91005, 2381 671 91006 and 2381 671 91007 TYPICAL RESISTANCE/TEMPERATURE CHARACTERISTIC FOR 2381 671 91002, 2381 671 91003 and 2381 671 91004 106 106 1.5 V (DC) max. 1.5 V (DC) max. Tn = 100 C 105 105 Tn = 110 C Resistance () Resistance () Tn = 120 C 104 103 104 103 Tn = 90 C 102 102 Tn = 80 C Tn = 70 C 10 0 50 100 150 Temperature (C) 200 10 250 TYPICAL RESISTANCE/TEMPERATURE CHARACTERISTIC FOR 2381 671 91009, 2381 671 91012 and 2381 671 91014 0 100 150 Temperature (C) 200 250 TYPICAL RESISTANCE/TEMPERATURE CHARACTERISTIC FOR 2381 671 91015, 2381 671 91016 and 2381 671 91017 106 106 1.5 V (DC) max. 1.5 V (DC) max. 105 105 104 104 Resistance () Resistance () 50 103 Tn = 155 C Tn = 160 C 103 Tn = 170 C Tn = 145 C 102 102 Tn = 150 C Tn = 140 C 10 0 www.vishay.com 58 50 100 150 Temperature (C) 200 250 10 0 50 For technical questions, contact: nlr@vishay.com 100 150 Temperature (C) 200 250 Document Number: 29017 Revision: 27-Oct-10 PTCSC..T....BE/2381 671 910.. PTC Thermistors, Mini Chips for Over-Temperature Protection Vishay BCcomponents 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 range, 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. 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 temperature, the PTC thermistor resistance (Rp) is lower than Rs (see Fig. 2), so the comparator's output voltage V0 will be low. If an equipment overtemperature occurs, the PTC thermistor will quickly heat up to its trigger or nominal reference temperature Tn, whereupon its resistance will increase to a value much higher than Rs, causing V0 to switch to a high level sufficient to activate an alarm, relay or power shutdown circuit. APPLICATION EXAMPLES VO R1 Rs Rp > Rs (R1 = R2) RL VO R p < Rs (R1 = R2) Rf R2 + PTC thermistor Rp Trigger temperature Tn Fig. 1 Typical comparator circuit T (C) Fig. 2 Typical switch characteristic + + + As soon as one or more of the windings becomes too hot, the motor is switched off. Fig. 3 Temperature protection of electric motors Document Number: 29017 Revision: 27-Oct-10 For technical questions, contact: nlr@vishay.com www.vishay.com 59 Legal Disclaimer Notice www.vishay.com Vishay Disclaimer ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE. 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