PDF《PTC Thermistors,》

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vishay.com For technical questions, contact: [email protected] Document Number:

29116 1 Revision: 03-Sep-10 PTCSSLVT Series/2381

671 914.. Vishay BCcomponents PTC Thermistors, Sleeve Type for Over-Temperature Protection FEATURES ? Well-defined protection temperature levels ? 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) ? No need to reset supply after overtemperature switch ? Small size and rugged ? Also available as triple sensor ? Compliant to RoHS directive 2002/95/EC and in accordance to WEEE 2002/96/EC APPLICATIONS Over-temperature/over-load protection: ? Motor protection (thermal protection of winding) ? Industrial electronics ? Power supplies ? Electronic data processing DESCRIPTION These PTC thermistors consist of a small PTC ceramic chip soldered between

2 ETFE insulated silver plated copper wires, insulated by a thermal sleeve. The are primarily intended for over-temperature sensing inside windings, coils, transformers and alike. PACKAGING The PTC thermistors are packed in BULK per

500 pcs. COMPONENT OUTLINES dimensions in millimeters QUICK REFERENCE DATA PARAMETER VALUE UNIT Maximum resistance at

25 °C

100 ? Minimum resistance at (Tn + 15) °C

4000 ? Maximum (AC/DC) voltage

30 V Thermal time constant ? 8.0 s Temperature range -

40 to (Tn + 15) °C Weight ? 2.0 g Climatic category 40/125/56 - °C/+ °C/ days NOMINAL WORKING TEMPERATURES AND ORDERING INFORMATION NOMINAL WORKING TEMPERATURE CATALOG AND ORDERING NUMBER 12NC REFRENCE NUMBER Tn (°C) Rmax. at Tn -

5 °C (?) Rmin. at Tn +

5 °C (?) SLEEVE DEVICE

2381 671 .....

70 570

570 PTCSSLVT071DBE

91402 80

550 1330 PTCSSLVT081DBE

91403 90

550 1330 PTCSSLVT091DBE

91404 100

550 1330 PTCSSLVT101DBE

91405 110

550 1330 PTCSSLVT111DBE

91406 120

550 1330 PTCSSLVT121DBE

91407 130

550 1330 PTCSSLVT131DBE

91409 140

550 1330 PTCSSLVT141DBE

91412 150

550 1330 PTCSSLVT151DBE

91414 L3 L1 L4 D3 D2 D1 Component outline L1

500 ±

20 L2

7 ±

2 L3

10 ±

3 D1 0.42 D2 0.7 D3

3 max. Document Number:

29116 For technical questions, contact: [email protected] www.vishay.com Revision: 03-Sep-10

2 PTCSSLVT Series/2381

671 914.. PTC Thermistors, Sleeve Type for Over-Temperature Protection Vishay BCcomponents TYPICAL RESISTANCE/TEMPERATURE CHARACTERISTIC

10 100

1000 10

000 100

000 1

000 000

10 000

000 -

50 -

25 0

25 50

75 100

125 150 Resistance ( Ω ) Temperature (°C)

2381 671

91404 PTCSSLVT091DBE

2381 671

91403 PTCSSLVT081DBE

2381 671

91402 PTCSSLVT071DBE

10 100

1000 10

000 100

000 1

000 000

10 000

000 -

50 -

25 0

25 50

75 100

125 150

175 Resistance ( Ω ) Temperature (°C)

2381 671

91407 PTCSSLVT121DBE

2381 671

91406 PTCSSLVT111DBE

2381 671

91405 PTCSSLVT101DBE

10 100

1000 10

000 100

000 1

000 000 -

50 -

25 0

25 50

75 100

125 150

175 200 Resistance ( Ω ) Temperature (°C)

2381 671

91414 PTCSSLVT151DBE

2381 671

91412 PTCSSLVT141DBE

2381 671

91409 PTCSSLVT131DBE www.vishay.com For technical questions, contact: [email protected] Document Number:

29116 3 Revision: 03-Sep-10 PTCSSLVT Series/2381

671 914.. Vishay BCcomponents PTC Thermistors, Sleeve Type for Over-Temperature Protection 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. 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 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 VO to switch to a high level sufficient to activate an alarm, relay or power shutdown circuit. APPLICATION EXAMPLES Fig.

1 Typical comparator circuit 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 PTC thermistor Rp RL Rf Rs R1 R2 Vo θ trigger temperature Tn Vo Rp Rs (R1 = R2) T (°C) Rp Rs (R1 = R2) θ θ θ Legal Disclaimer Notice www.vishay.com Vishay Revision: 08-Feb-17

1 Document Number:

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