PTCSL20 Series www.vishay.com Vishay BCcomponents PTC Thermistors, Mini Radial Leaded for Over-Temperature Protection FEATURES • • • • Well-defined protection temperature levels Fast reaction time (< 15 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 Non preferred type (replaced by PTCSL03) APPLICATIONS QUICK REFERENCE DATA PARAMETER VALUE UNIT 20 to 100 Ω Resistance at 25 °C (R25) Nominal working temperature 70 to 150 °C (Tn) Tolerance on Tn ±5 °C Maximum voltage (AC or DC) 30 V -20 to 165 °C Operating temperature range (1) Dissipation factor 5 mW/K Storage temperature -25 to +155 °C Note (1) Max operating temperature range is T +15 °C, indicated value n is for Tn = 150 °C. Over-temperature protection and control in: • Industrial electronics • Power supplies • Motor protection DESCRIPTION These PTC sensing thermistors consist of a medium resistivity doped BaTiO3 ceramic chip lead (Pb)-free soldered with nickel wires and coated with a high temperature silicone lacquer and color coding band. PACKAGING PTC thermistors are available in 500 pieces bulk packed. COMPONENT OUTLINES DIMENSIONS in millimeters 3.0 max. 3.5 max. 0.5 min. L 7.0 max. 2.5 Ø 0.4 PTCSL20T..., L = 20 ± 2 PTCSL40T..., L = 40 min. NOMINAL WORKING TEMPERATURES AND ORDERING INFORMATION RESISTANCE NOMINAL RESISTANCE RESISTANCE from -20 °C to WORKING TEMP. at Tn +5 °C at Tn -5 °C Tn -20 °C Tn (Ω) (kΩ) (Ω) (°C) 70 20 to 250 50 to 570 0.570 to 50 80 20 to 250 50 to 550 1.33 to 50 90 20 to 250 50 to 550 1.33 to 50 100 20 to 250 50 to 550 1.33 to 50 110 20 to 250 50 to 550 1.33 to 50 120 20 to 250 50 to 550 1.33 to 50 130 20 to 250 50 to 550 1.33 to 50 140 20 to 250 50 to 550 1.33 to 50 150 20 to 250 50 to 550 1.33 to 50 Note (2) Parts with total length of 40 mm available as PTCSL40T...DBE catalog numbers. Revision: 04-Dec-15 MIN. RESISTANCE at Tn +15 °C (kΩ) 4 4 4 4 4 4 4 4 4 COLOR CODE ORDERING PART NUMBERS (2) Black Brown Red Orange Yellow Green Blue Violet Grey PTCSL20T071DBE PTCSL20T081DBE PTCSL20T091DBE PTCSL20T101DBE PTCSL20T111DBE PTCSL20T121DBE PTCSL20T131DBE PTCSL20T141DBE PTCSL20T151DBE Document Number: 29012 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 PTCSL20 Series www.vishay.com Vishay BCcomponents TYPICAL RESISTANCE/TEMPERATURE CHARACTERISTIC for Tn 100 °C to 120 °C TYPICAL RESISTANCE/TEMPERATURE CHARACTERISTIC for Tn 70 °C to 90 °C 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 104 103 102 104 103 Tn = 90 °C 102 Tn = 80 °C Tn = 70 °C 10 0 50 100 150 200 10 250 0 50 Temperature (°C) 200 250 TYPICAL RESISTANCE/TEMPERATURE CHARACTERISTIC for Tn 140 °C and 150 °C TYPICAL RESISTANCE/TEMPERATURE CHARACTERISTIC for Tn 130 °C 106 106 1.5 V (DC) max. 1.5 V (DC) max. 105 105 104 104 Resistance (Ω) Resistance (Ω) 100 150 Temperature (°C) 103 103 102 102 Tn = 150 °C Tn = 140 °C Tn = 130 °C 10 0 50 100 150 Temperature (°C) Revision: 04-Dec-15 200 250 10 0 50 100 150 200 250 Temperature (°C) Document Number: 29012 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 PTCSL20 Series 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 (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 Revision: 04-Dec-15 Document Number: 29012 3 For technical questions, contact: [email protected] THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. 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