PTCSC17 www.vishay.com Vishay BCcomponents PTC Thermistors, Mini Chips for Over-Temperature Protection FEATURES • • • • 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) • Small size and rugged • Material categorization: for definitions of compliance please see www.vishay.com/doc?99912 QUICK REFERENCE DATA PARAMETER VALUE UNIT Resistance at 25 °C (R25) 30 to 100 Ω Nominal working temperature (Tn) 70 to 150 °C ±5 °C Tolerance on Tn Maximum voltage (AC or DC) Operating temperature range (1) Dissipation factor Storage temperature 30 V -20 to 165 °C 5 mW/K -25 to +155 °C APPLICATIONS Over-temperature protection and control in: • Industrial electronics • Power supplies • Motor protection Note (1) Max operating temperature range is T +15 °C, indicated value n is for Tn = 150 °C. COMPONENT OUTLINES DIMENSIONS in millimeters 0.8 ± 0.1 1.7 ± 0.15 1.7 ± 0.15 DESCRIPTION These directly heated thermistors have a positive temperature coefficient and are primarily intended for sensing. MOUNTING For clamping, reflow or hand soldering. Not intended for ultrasonic soldering or for spot welding or bonding. All standard solder alloys with low activated halogen-free fluxes are acceptable. PACKAGING PTC thermistor chips are vacuum packed in 5000 pieces. NOMINAL WORKING TEMPERATURES AND ORDERING INFORMATION ORDERING PART NUMBERS NOMINAL WORKING TEMPERATURE BARE CHIP Tn (°C) RESISTANCE from -20 °C to Tn -20 °C (Ω) RESISTANCE at Tn -5 °C (Ω) RESISTANCE at Tn +5 °C (kΩ) Rmin. at Tn +15 °C (kΩ) 70 30 to 250 50 to 570 0.57 to 50 4 PTCSC17T071DBE 80 30 to 250 50 to 550 1.33 to 50 4 PTCSC17T081DBE 1.7 x 1.7 (mm) 90 30 to 250 50 to 550 1.33 to 50 4 PTCSC17T091DBE 100 30 to 250 50 to 550 1.33 to 50 4 PTCSC17T101DBE 110 30 to 250 50 to 550 1.33 to 50 4 PTCSC17T111DBE 120 30 to 250 50 to 550 1.33 to 50 4 PTCSC17T121DBE 130 30 to 250 50 to 550 1.33 to 50 4 PTCSC17T131DBE 140 30 to 250 50 to 550 1.33 to 50 4 PTCSC17T141DBE 150 30 to 250 50 to 550 1.33 to 50 4 PTCSC17T151DBE 155 30 to 250 50 to 550 1.33 to 50 4 PTCSC17T155DBE 160 30 to 250 50 to 550 1.33 to 50 4 PTCSC17T161DBE 170 30 to 250 50 to 550 1.33 to 50 4 PTCSC17T171DBE Document Number: 29017 1 For technical questions, contact: [email protected] 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 Revision: 08-Dec-15 PTCSC17 www.vishay.com Vishay BCcomponents TYPICAL RESISTANCE/TEMPERATURE CHARACTERISTICS for Tn 70 °C to 90 °C TYPICAL RESISTANCE/TEMPERATURE CHARACTERISTIC for Tn 100 °C to 120 °C 106 106 1.5 V (DC) max. 1.5 V (DC) max. Tn = 100 °C 105 105 Tn = 110 °C Resistance (Ω) Resistance (Ω) 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 CHARACTERISTICS for Tn 140 °C to 150 °C 0 100 150 Temperature (°C) 106 1.5 V (DC) max. 1.5 V (DC) max. 105 104 104 Resistance () 105 103 200 250 TYPICAL RESISTANCE/TEMPERATURE CHARACTERISTICS for Tn 150 °C to 170 °C 106 Resistance (Ω) 50 Tn = 155 °C Tn = 160 °C 103 Tn = 170 °C Tn = 145 °C 102 102 Tn = 150 °C Tn = 140 °C 10 0 50 100 150 Temperature (°C) 200 250 10 0 50 100 150 Temperature (°C) 200 250 Document Number: 29017 2 For technical questions, contact: [email protected] 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 Revision: 08-Dec-15 PTCSC17 www.vishay.com 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 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. 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 over temperature 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 +θ +θ +θ As soon as one or more of the windings becomes too hot, the motor is switched off. Fig. 3 - Temperature Protection of 3-phase electric motor Document Number: 29017 3 For technical questions, contact: [email protected] 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 Revision: 08-Dec-15 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. Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other disclosure relating to any product. Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or the continuing production of any product. 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