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PTC Thermistor (POSISTOR®)

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PTC Thermistor (POSISTOR®) !Note • This PDF catalog is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’s specifications are subject to change or our products in it may be discontinued without advance notice. Please check with our sales representatives or product engineers before ordering. R16E.pdf • This PDF catalog has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering. 08.9.25 PTC Thermistor (POSISTOR®) Application Manual Murata Manufacturing Co., Ltd. Cat.No.R16E-4 !Note • This PDF catalog is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’s specifications are subject to change or our products in it may be discontinued without advance notice. Please check with our sales representatives or product engineers before ordering. R16E.pdf • This PDF catalog has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering. 08.9.25 for EU RoHS Compliant • All the products on this catalog are complied with EU RoHS. • EU RoHS is "the European Directive 2002/95/EC on the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment". • For more details, please refer to our website 'Murata's Approach for EU RoHS' (http://www.murata.com/info/rohs.html). !Note • This PDF catalog is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’s specifications are subject to change or our products in it may be discontinued without advance notice. Please check with our sales representatives or product engineers before ordering. R16E.pdf • This PDF catalog has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering. 08.9.25 POSISTOR® Application and Variety ListYYYYY02 1 Characteristics of POSISTOR®Y YYYYYYYYYYYYYY03 CONTENTS 1. Introduction .................................................................................03 2. Characteristics of POSISTOR® ...................................................03 2 Y YYYYYYYYYYYYYYYYYYYYYYY04 The basic design data Characteristics of 1. Resistance - temperature characteristics .................................04 1 POSISTOR® 2. Voltage - current characteristics (Static characteristics) ........05 3. Current - time characteristics (Dynamic characteristics) .......06 The basic design data 3 Structure of POSISTOR®YYYYYYYYYYYYYYYYYYYYY07 2 4 Practical applications of POSISTOR®Y YYYYYYY08 Structure of POSISTOR® 1. Heating (Automatic temperature adjustment heater) ..............08 3 2. For temperature sensor and temperature compensation .......09 3. For current control .................................................................... 011 Practical applications of ® 5 TermsY YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY012 4 POSISTOR !Strict observance .......................................................................012 !Notice ..........................................................................................012 5 Terms POSISTOR® and "POSISTOR" in this manual are the trademarks of Murata Manufacturing Co., Ltd. !Note • This PDF catalog is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’s specifications are subject to change or our products in it may be discontinued without advance notice. Please check with our sales representatives or product engineers before ordering. R16E.pdf • This PDF catalog has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering. 08.9.25 POSISTOR® Application and Variety List Temp com- Motor Over current Protection Overheat Sensing Heater pensation starter Case type Application Target device Lead type Contact type Chip type Lead type Chip type Lead type Hot air type PTH6M PTFL PTWSB PRG PTGL PRF PTRL PTWH PTH7M PTFM PTWTA PTHTM Plasma TV K K K K K LCD TV K K K K Projection TV K K K K CATV K STB K Video camera K K Digital camera K K DVD recorder K K K AV equipment VTR K K K Audio K K K K Electric keyboard, Electronic music K K K K instrument Digital mobile audio K K MD/CD player K K TV game K K K Portable game K K Laptop K K Desktop computer K K Server K K K K Printer K K K K Scanner K K Information LCD display K K K K equipment USB access device K HDD K CD/DVD-ROM/RAM K K Copy machine K K K K Electronic dictionary/databook K K Electronic blackboard K K K K Electronic automatic exchange K Transmission equipment K PBX K Cordless telephone K Communica- Fax machine K K K K tions equip- Modem K ment Cellular phone K K Headset K Cellular phone base station K K K K Intercom K K Engine control ECU K K Drive control ECU K K Air-bag K Anticollision radar K ABS/ESC K K Instrument/display panel, Meter K Rechargeable battery for EV/HEV K K Car air conditioner K K Heater, HVAC K Car HID/LED headlight, AFS K K K electronics LED tail light K K K LED interior light K K Retractable electric mirror K Door lock, trunk opener K Power seat K Shock absorber K VICS, ETC K Burglar alarm K K Car navigation K K K Car audio K K K K Refrigerator K K K K Microwave, Oven K K K Electric rice-cooker K K K IH cooking device K K Air conditioner K K K K K Fan heater K K Cleaner K K Bath dryer K Clothes washer, cloth dryer K K Futon dryer K Home Hot-air heater K electronics Electric pot K Household Ventilator K equipment hot-water pot K K K Humidifying device K Inhaler K Illumination device K K K K Massage chair, healthcare equipment K K K K K Curling iron K Potable compact iron K Hot water spray toilet seat K K K K Electric power tool K K K K Electric mosquito extermination, K fragrance device Switching supply K K K K Power supply Inverter power K K K K AC adapter, battery charger K K K 2 !Note • This PDF catalog is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’s specifications are subject to change or our products in it may be discontinued without advance notice. Please check with our sales representatives or product engineers before ordering. R16E.pdf • This PDF catalog has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering. 08.9.25 1 Characteristics of POSISTOR® 1. Introduction Barium titanate (BaTiO3) is a ferroelectric substance Since then, it has been applied to several applications that was first identified in 1944. Its resistivity at room under the name of POSISTOR. temperature becomes an n-type controlled-valency 1 semiconductor with 1-106ohm · cm, if a slight amount POSISTOR is Positive Temperature Coefficient of rare earth elements are added to Barium titanate. Thermistor (PTC Thermistor). Normally when the It was first made in 1951. Murata was extremely temperature increases, the resistance of conventional interested in this semiconductor and successfully Thermistor decreases. But, the resistance of PTC starting the first commercial production of the Thermistor rises sharply when its temperature exceeds POSISTOR in 1961. a specific temperature. 2. Characteristics of the POSISTOR® Basically, the POSISTOR increases its resistance value, three characteristics can be made, which are described when its temperature rises. From this phenomenon, below. !Table 1 Characteristics of POSISTOR Resistance - temperature Voltage - current characteristics Current - time characteristics characteristics (Static Characteristic, (Dynamic characteristic, (time independent) time independent) time dependent) 104 3 10 Constant Power 102 Basic 10 characteristics Current (A) log I Current 1 Constant Resistance Resistance Value (Ω) Resistance Value 0 50 100 150 200 10 15 20 25 log V Voltage Temperature (°C) Time (sec.) Resistance Value up Resistance Resistance Value up Resistance Value up log R log I at 25degC (Ω) Current (A) Temperature (°C) log V Time (sec.) Ta up Ambient Ta up log R log I temperature (Ta) (Ω) Current (A) Temperature (°C) log V Time (sec.) Temperature change can be detected This characteristic shows the relation This characteristic shows the because the resistance of POSISTOR between the applied voltage and relation between current and time is changed by ambient temperature. stable current, when the Thermistor as equilibrium is achieved between internal self-heating equals the heat internal self-heating and heat Features dissipated by the Thermistor to the dissipation under the applied voltage. outside (state of equilibrium). Each above chart is composed of constant resistance area, maximum current point and constant power area. 1. Temperature sensing, temperature 1. Current control, over current 1. Motor starter element compensation protection (Motor starter relay) Functions 2. Overheat protection of electric 2. Constant temperature heater 2. Timer delay element & applications equipment, electric devices, Heater 3. Detector element using change of devices, Power supplies. Power IC/ heat dissipation factor FET 4. Constant voltage and constant current equipment 3 !Note • This PDF catalog is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’s specifications are subject to change
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