PTCSGM3 www.vishay.com 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 Tn +15 °C) • Wide range of protection temperatures (70 °C to 150 °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) 20 to 100 Ω Nominal working temperature (Tn) 70 to 150 °C Tolerance on Tn ±5 °C Maximum voltage (AC or DC) 30 V Thermal time constant ~8 s -20 to 165 °C 5 mW/K -25 to +155 °C ~2 g Operating temperature range (1) Dissipation factor Storage temperature Weight Note (1) Max operating temperature range is T +15 °C, indicated value n is for Tn = 150 °C. APPLICATIONS Over-temperature protection and control in: • Industrial electronics • Power electronics • Motor protection DESCRIPTION These PTC sensing thermistors consist of a medium resistivity doped BaTiO3 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. NOMINAL WORKING TEMPERATURES AND ORDERING INFORMATION NOMINAL WORKING TEMPERATURE Tn (°C) Rmax. at Tn - 5 °C (Ω) Rmin. at Tn + 5 °C (Ω) Rmin. at Tn + 15 °C (Ω) 70 80 90 100 110 120 130 140 150 570 550 550 550 550 550 550 550 550 570 1330 1330 1330 1330 1330 1330 1330 1330 4000 4000 4000 4000 4000 4000 4000 4000 4000 ORDERING PART NUMBERS LUG DEVICE PTCSGM3T071DBE PTCSGM3T081DBE PTCSGM3T091DBE PTCSGM3T101DBE PTCSGM3T111DBE PTCSGM3T121DBE PTCSGM3T131DBE PTCSGM3T141DBE PTCSGM3T151DBE COMPONENT OUTLINES DIMENSIONS in inches (millimeters) 0.145 [3.68] dia. hole 0.281 [7.14] 0.157 ± 0.039 [4 ± 1] 1.496 ± 0.157 [38 ± 4] 0.64 [16.26] max. 0.04 [1.016] Document Number: 29018 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: 15-Dec-15 PTCSGM3 www.vishay.com Vishay BCcomponents TYPCIAL RESISTANCE/TEMPERATURE CHARACTERISTIC 107 107 106 106 PTCSGM3T071DBE PTCSGM3T101DBE 105 104 Resistance (Ω) Resistance (Ω) 105 PTCSGM3T081DBE 104 103 103 102 102 PTCSGM3T111DBE PTCSGM3T091DBE 101 -50 -25 0 25 50 75 100 125 PTCSGM3T121DBE 101 -50 150 -25 Temperature (°C) 0 25 50 75 100 125 150 175 Temperature (°C) 106 105 Resistance (Ω) PTCSGM3T131DBE 104 PTCSGM3T141DBE 103 102 PTCSGM3T151DBE 101 -50 -25 0 25 50 75 100 125 150 175 200 Temperature (°C) Document Number: 29018 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: 15-Dec-15 PTCSGM3 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. So how does it work? 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 VO 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 VO to switch to a high level sufficient to activate an alarm, relay or power shutdown circuit. APPLICATION EXAMPLES VO R1 Rs Rp > Rs RL (R1 = R2) VO Rf R2 Rp < Rs (R1 = R2) + PTC thermistor Rp Fig. 1 - Typical comparator circuit Trigger temperature Tn T (°C) Fig. 2 - Typical switch characteristic Document Number: 29018 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: 15-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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