2322 671 91... Vishay BCcomponents PTC Thermistors, For Temperature Protection FEATURES • • • • • • • • QUICK REFERENCE DATA PARAMETER Maximum resistance at 25 °C Minimum resistance at (Tn + 15) °C VALUE UNIT 120 Ω 4000 Ω Maximum (DC) voltage 30 V −20 to (Tn + 15) °C 91002 to 91014 ≈0.013 g 91072 to 91087 ≈0.003 g Temperature range Weight: Well-defined protection temperature levels Very fast reaction time Accurate resistance for ease of circuit design Excellent long term behavior Wide range of protection temperatures No need to reset supply after overtemperature switch Small size and rugged Coated leaded and naked devices available. APPLICATIONS • • • • Industrial electronics Power supplies Electronic data processing Motor protection. DESCRIPTION 91102 to 91114 ≈0.08 g 91152 to 91164 ≈0.09 g Climatic category 25/125/56 These directly heated thermistors have a positive temperature coefficient and are primarily intended for sensing. NOMINAL WORKING TEMPERATURES AND ORDERING INFORMATION NOMINAL WORKING TEMPERATURE TYPE/CATALOG NUMBER 2322 ... ..... NAKED CHIP(1) Tn (°C) RESISTANCE from −20 °C to Tn −20 °C (Ω) RESISTANCE at Tn −5 °C (Ω) RESISTANCE at Tn +5 °C (kΩ) 70 80 90 100 110 120 125 130 135 140 145 150 155 160 170 30 to 250 30 to 250 30 to 250 30 to 250 30 to 250 30 to 250 30 to 250 30 to 250 30 to 250 30 to 250 30 to 250 30 to 250 30 to 250 30 to 250 30 to 250 50 to 570 50 to 550 50 to 550 50 to 550 50 to 550 50 to 550 50 to 550 50 to 550 50 to 550 50 to 550 50 to 550 50 to 550 50 to 550 50 to 550 50 to 550 0.570 to 50 1.33 to 50 1.33 to 50 1.33 to 50 1.33 to 50 1.33 to 50 1.33 to 50 1.33 to 50 1.33 to 50 1.33 to 50 1.33 to 50 1.33 to 50 1.33 to 50 1.33 to 50 1.33 to 50 LEADED DEVICE 1.0 × 1.0 (mm) 1.7 × 1.7 (mm) NORMAL LEADS LONG LEADS 671 ..... 671 ..... 671 ..... 671 ..... 91072 91073(2) 91074(2) 91075(2) 91076 91077 91078 91079 91081 91082 91083 91084 91085 91086 91087 91002 91003 91004 91005 91006 91007 − 91009 − 91012 − 91014 − 91016 91017 91102 91103 91104 91105 91106 91107 − 91109 − 91112 − 91114 − − − 91152 91153 91154 91155 91156 91157 − 91159 − 91162 − 91164 − − − COLOR CODE black brown red orange yellow green − blue − violet − grey − − − Notes 1. Naked chips are packed in a hermetically-sealed alu-plastic bag. 2. Resistance at Tn +5 °C = 0.570 to 50 kΩ. www.vishay.com 172 For technical questions contact: [email protected] Document Number: 29074 Revision: 10-Oct-03 2322 671 91... Vishay BCcomponents PTC Thermistors, For Temperature Protection ELECTRICAL CHARACTERISTICS PARAMETER VALUES Maximum resistance at 25 °C 120 Ω Maximum resistance at (Tn − 5) °C see Nominal Working Temperatures and Ordering Information table Minimum resistance at (Tn + 15) °C 4000 Ω Minimum resistance at (Tn + 5) °C see Nominal Working Temperatures and Ordering Information table Maximum voltage 30 V (AC or DC) DIMENSIONS in millimeters PACKAGING QUANTITIES AND CATALOG NUMBERS PACKAGING SPQ PQ CATALOG NUMBERS 2322 ... ..... 5000 20000 671 91002 to 671 91014 5000 20000 671 91072 to 671 91087 500 5000 671 91102 to 671 91114 500 5000 671 91152 to 671 91164 COMPONENT OUTLINES 3.5 max 7.0 max 0.5 min 20.0 2 3.5 max 3.0 max 0.5 min 40.0 min 2.54 3.0 max 2.54 O 0.4 O 0.4 JW128 MGC102 Component outline for 91102 to 91114. 7.0 max Component outline for 91152 to 91164. 91002 to 91017 1.7 91071 to 91087 0.5 0.15 0.8 0.1 0.1 0.15 0.1 1.0 1.7 0.1 1.0 JW127 MGA051 Component outline for 91071 to 91087. 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: 29074 Revision: 10-Oct-03 For technical questions contact: [email protected] www.vishay.com 173 2322 671 91... Vishay BCcomponents PTC Thermistors, For 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 MBA921 - 2 Vo R1 RL Rs Rp Rs (R1 = R2) VO Rp Rf θ R2 Rs (R1 = R2) PTC thermistor Rp MBA920 Fig.1 .Typical comparator circuit. T ( oC) trigger temperature Tn Fig.2 Typical switch characteristic. A θ θ θ θ θ θ MBD129 As soon as one or more of the windings becomes too hot, the motor is switched off. Fig.3 Temperature protection of electric motors θ MBD126 The PTC thermistors located above the fluid level will be heated to a temperature greater than Tn. When immersed they are cooled such that their resistance value is reduced. Fig.4 Liquid-level indication. www.vishay.com 174 For technical questions contact: [email protected] Document Number: 29074 Revision: 10-Oct-03 2322 671 91... PTC Thermistors, For Temperature Protection TYPICAL RESISTANCE/TEMPERATURE CHARACTERISTIC FOR 2322 671 91052/002/102, 91053/003/103 and 91054/004/104. CCB897 106 Vishay BCcomponents TYPICAL RESISTANCE/TEMPERATURE CHARACTERISTIC FOR 2322 671 91055/005/105, 91056/006/106 and 91057/007/107. CCB898 106 1.5 V (DC) max. 1.5 V (DC) max. R (Ω) R (Ω) Tn = 100 °C 105 105 Tn = 110 °C Tn = 120 °C 104 104 103 103 Tn = 90 °C 102 102 Tn = 80 °C Tn = 70 °C 10 10 0 50 100 150 200 0 250 50 100 150 200 TYPICAL RESISTANCE/TEMPERATURE CHARACTERISTIC FOR 2322 671 91058, 91059/009/109 and 91061. CCB899 106 250 T (°C) T (°C) TYPICAL RESISTANCE/TEMPERATURE CHARACTERISTIC FOR 2322 671 91062/012/112, 91063 and 91064/014/114. CCB900 106 1.5 V (DC) max. 1.5 V (DC) max. R (Ω) R (Ω) 105 105 104 104 103 103 Tn = 135 °C 102 102 Tn = 145 °C Tn = 150 °C Tn = 125 °C Tn = 130 °C Tn = 140 °C 10 10 0 50 100 150 200 250 0 50 T (°C) Document Number: 29074 Revision: 10-Oct-03 For technical questions contact: [email protected] 100 150 200 250 T (°C) www.vishay.com 175 2322 671 91... Vishay BCcomponents PTC Thermistors, For Temperature Protection TYPICAL RESISTANCE/TEMPERATURE CHARACTERISTIC FOR 2322 671 91065, 91066 and 91067. CCB901 106 1.5 V (DC) max. Tn = 155 °C R (Ω) 105 104 Tn = 160 °C 103 Tn = 170 °C 102 10 0 50 100 150 200 250 T www.vishay.com 176 (°C) For technical questions contact: [email protected] Document Number: 29074 Revision: 10-Oct-03