PTC Thermistors POSISTOR® Application Manual 11/03/2014 by Murata Manufacturing Co.,Ltd.

More catalogs by Murata Manufacturing Co.,Ltd. | PTC Thermistors POSISTOR® Application Manual 11/03/2014 | 14 pages | 2018-02-02

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Catalog PTC Thermistors POSISTOR® Application Manual 11/03/2014

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note • please read rating and caution for storage and operating rating soldering and mounting handling in this catalog to prevent smoking and/or burning etc • this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering ptc thermistor posistor® application manual cat.no.r16e-4 r16e.pdf

note • please read rating and caution for storage and operating rating soldering and mounting handling in this catalog to prevent smoking and/or burning etc • this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering for eu rohs compliant all the products on this catalog are complied with eu rohs eu rohs is the european directive 2011/65/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 • • r16e.pdf

note • please read rating and caution for storage and operating rating soldering and mounting handling in this catalog to prevent smoking and/or burning etc • this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering posistor® application and variety list————2 r16e.pdf 2014.03.05 contents 1 characteristics of posistor®————————————3 1 introduction 03 2 characteristics of posistor® 03 2 the basic design data ————————————————— 04 1 resistance temperature characteristics 04 2 voltage current characteristics static characteristics 05 3 current time characteristics dynamic characteristics 06 3 structure of posistor®

r16e.pdf 2014.03.05 note • please read rating and caution for storage and operating rating soldering and mounting handling in this catalog to prevent smoking and/or burning etc • this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering posistor® application and variety list over current protection application target device av equipment information equipment communications equipment car electronics home electronics household equipment power supply 2 plasma tv lcd tv projection tv catv stb video camera digital camera dvd recorder vtr audio electric keyboard electronic music instrument digital mobile audio md/cd player tv game portable game laptop desktop computer server printer scanner lcd display usb access device hdd cd/dvd-rom/ram copy machine electronic dictionary/databook electronic blackboard electronic automatic exchange transmission equipment pbx

r16e.pdf 2014.03.05 note • please read rating and caution for storage and operating rating soldering and mounting handling in this catalog to prevent smoking and/or burning etc • this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering 1 characteristics of posistor® 1 introduction barium titanate batio3 is a ferroelectric substance that was first identified in 1944 its resistivity at room temperature becomes an n-type controlled-valency semiconductor with 1-106ohm · cm if a slight amount of rare earth elements are added to barium titanate it was first made in 1951 murata was extremely interested in this semiconductor and successfully starting the first commercial production of the posistor in 1961 since then it has been applied to several applications under the name of posistor 1 posistor is positive temperature coefficient thermistor ptc thermistor

r16e.pdf 2014.03.05 note • please read rating and caution for storage and operating rating soldering and mounting handling in this catalog to prevent smoking and/or burning etc • this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering 2 the basic design data 1 resistance temperature characteristics 105 can be changed as shown in fig 2 and fig 3 in the case where a posistor is used for temperature compensation of a transistor for example this method is useful to obtain suitable temperature characteristics ■table 3 temp characteristics t.c and cp t.c ad ae af ag ah ak al am an ap as ar cp degc 280 260 240 220 200 180 170 160 150 140 130 120 t.c ba bb bc bd be bf bg bh t cp degc 110 100 90 80 70 60 50 40 −50 bd bb as an bc ar ap am ak 104 10 ah bg rate of resistance change r/25°c ag bh af 103 ae ad k=2.0 102 k=1.0 t r/rpo 1 rp rs k=0.5 10 single

r16e.pdf 2014.03.05 note • please read rating and caution for storage and operating rating soldering and mounting handling in this catalog to prevent smoking and/or burning etc • this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering the basic design data 2 2 voltage current characteristics static characteristics l0 9 pt g pt g l1 l1 8 2 .2 4 Ω 4 2 .2 .7 Ω Ω all posistor characteristic ar ambient temperature at 25°c g 4 7Ω g pt g l0 7 pt 2 2 2Ω l0 7 pt current ma 102 10 1 10 100 voltage v fig 4-2 changing dimension and resistance value ambient temperature 100 0°c 10°c 25°c 40°c 60°c 10 10 100 voltage v fig 4-3 changing ambient temperature 1000 ptgl07ar rp rs current ma posistor k=0 ta=25°c rs=krpo rpo resistance value of a posistor at 25°c k=2 k=3 k=5 100 10 1 10 voltage v 1000 ptgl07ar 1 current ma all

r16e.pdf 2014.03.05 note • please read rating and caution for storage and operating rating soldering and mounting handling in this catalog to prevent smoking and/or burning etc • this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering 2 the basic design data 3 current time characteristics dynamic characteristics ptgl09ar220m6b52b0 ta=25°c current value a 1.5 1.0 0.5 0 2 4 6 8 10 12 time sec fig 6-3 inrush current and attenuation 6 1000 ptgl07ar ta=25°c rs=krpo rpo resistance value of a posistor at 25°c rp rs 4 900 ta=25°c 16v 2 700 0 current ma current value a 800 -2 -4 600 k=2 500 k=3 400 300 k=5 200 0 50 100 150 200 250 300 350 400 100 time msec 0 2 4 6 8 10 time sec fig 6-1 current time characteristic ac 1000 ptgl07ar 900 8 rp rf 800 16v 700 current ma 6 current value a 2 if a specific voltage above the v-i chart’s maximum current

r16e.pdf 2014.03.05 note • please read rating and caution for storage and operating rating soldering and mounting handling in this catalog to prevent smoking and/or burning etc • this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering 3 structure of posistor® leaded products of posistor as shown in fig 8 can have their posistor element either soldered to lead wires and its surface then coated with epoxy resin or the element can be held in place by spring terminals and encased in a plastic housing in the case of the latter the spring terminals also provide the electrical connection and exit the housing as lead terminals the shape of the posistor can either be square or round recently chip type posistors are becoming more common prf · prg bulk type ptgl 3 ptfm ⑦ ③ ② ④ ① ② ① ⑥ ① ② prg multi-layer

r16e.pdf 2014.03.05 note • please read rating and caution for storage and operating rating soldering and mounting handling in this catalog to prevent smoking and/or burning etc • this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering 4 practical applications of posistor® 1 for temperature sensor and temperature compensation 1 for temperature compensation and overheat sensing of transistors 2 3 r’l r’b rl rb rl rb posistor ra fig 9 more than two pieces of posistor can cover multi hot spots working with a comparator fig 9-2 shows basic circuit idea to connect multiple posistor in series when one posistor detects overheat at least a comparator can work by the sharp temperatureresistance characteristic it easily allows changing a number of posistor or sensing temperature in the same basic circuit design ra re posistor ra posistor re temperature

r16e.pdf 2014.03.05 note • please read rating and caution for storage and operating rating soldering and mounting handling in this catalog to prevent smoking and/or burning etc • this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering practical applications of posistor® 4 3 for temperature indication fig 14 shows most simple example of a temperature indicator temperature is sensed by posistor if the target temperature is exceeded determined by which posistor is used a neon tube lights up 1 2 20kΩ 100v 60hz posistor neon lamp posistor neon lamp 100v 60hz 20kΩ fig 11 temperature indication by posistor ptgl 4 for temp indication overheat protection

r16e.pdf 2014.03.05 note • please read rating and caution for storage and operating rating soldering and mounting handling in this catalog to prevent smoking and/or burning etc • this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering 4 practical applications of posistor® 2 for current control 1 over current protection if a circuit’s current limit is exceed a posistor can react to the higher current self heating and quickly protect the circuit fig 12 transistor 1 motor 2 posistor 100k Ω -b rl 100k Ω -b rl posistor posistor 10k Ω 0.1μf motor 10k Ω 2.2Ω m power source 10μf power circuit 3 posistor antenna posistor power source 30μf 75Ω 160v coaxial cable 27Ω booster t.v 160v 30μf posistor power source ptgl04 ptgl07 ptgl12 4 fig 12 protection from over current 2 delay circuit 2 posistor relay posistor r time adjustment

note • please read rating and caution for storage and operating rating soldering and mounting handling in this catalog to prevent smoking and/or burning etc • this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering r16e.pdf 2014.03.05 5 terms definitions of typical terms for posistor®s are listed here 1 initial resistance r25 this is the part’s resistance value at 25degc which is measured under conditions of 1.0vdc or less and 10ma or less without self-heating 2 curie point c.p temperature resistance temperature characteristics a posistor maintains almost the same resistance until certain temperature after this temperature is exceeded the resistance of posistor rises up sharply this transition point is called the “curie point” or “c.p.” murata defines this critical temperature to be the ‘curie point’ temperature

note • please read rating and caution for storage and operating rating soldering and mounting handling in this catalog to prevent smoking and/or burning etc • this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering 12 r16e.pdf