electronic alliance www.eaa.net.au 1 / 9 ptc series specification common glossary : rate zero-power resistance (rn) :dc resistance value of the thermistor measured under 25 by adopting sufficiently low power consumption. maximum operating voltage (vmax) the maximum rated voltage the ptc thermistor can continuously endure at 25 . maximum inrush current (imax) the maximum current (effective value) through the ptc thermistor under max.rated voltage. exceeding this current may result in damage to the ptc components. reference temperature (tsw) the temperature at which the resistance value of the ptc thermistor increases to twice rmin, also called curie temperature. non-trip current (int) rated current or holding current, at ma ximum operating temperature, this is the maximum current value that doesn?t trip the ptc to the high resistance state. under these conditions, ptc performs as a fixed resistor. trip current (it) the minimum current value that will cause the ptc to trip to the protective high resistance state. operating temperature range the ambient temperature range in whic h ptc can be used when the maximum voltage is applied. range is -10 to+60 . temperature coefficient of resistance(a t ) the temperature coefficient is calculated from the linear range at the steepest portion of resistance (tb-tp) as illustrated in fig.1. a t =(inrp-inrb) ? 100/(tp-tb) (%/ ) dissipation factor ( ) the ratio power dissipation change to temperature change of ptc thermistor(in mw/ ). =p/(t-tr) where p=dissipation power t=thermistor body temperature tr=room temperature http:///
electronic alliance www.eaa.net.au 2 / 9 mz2 series for overcurrent protection in telecom advanced developments in telephony equipment in rencent years have radically altered the protection requirements for both exchange and subscriber equipment. the ptc thermistor must protect the telephone.line circuit against overcurrent, which may be caused the following examples: ? surges due to lighting strikes on or near to the line plant. ? short-term induction of alternating voltage from adjacent power lines or railway systems ,usually caused when these lines or systems develop faults. ? direct contact between telephone lines and power lines. to provide good protection under such conditions a ptc ther m ist or is connected in series with each line, usually as secondar y pr otection; see fig.1. however, even with pri m ary line protection (usually a gas discharge tube ),the ptc therm istor m u st fulfill severe requirem e nt s. surge pulses of up t o 2 kv can occur and in or der to withstand short-ter m power induction the ptc therm istor must withstand hign voltages. if the line ha s primary pro tection, a 220 v to 300v p tc therm isto r is adequate. without primary pr otec tion ,600v ptc d e vice is necessary .. fig.1 fig.2 fig. 3 fig. 4 component outline fig.5 examples of application http:///
electronic alliance www.eaa.net.au 3 / 9 marking of partnumber spec.table responding time(sec) part no. non-trip current (ma) rated resistance( ? ) 3a 0.5a 1a 0.5a 0.5a 0.15a mz21-18rm110a 110 1820% 0.18 1.1 6.0 MZ21-18RM110B 110 1820% 0.18 1.1 6.0 mz22-12rm100 100 1220% 0.2 1.5 12.0 mz22-12rm080 80 1220% 0.2 1.2 10.0 mz23-12rm080 80 1220% 0.2 1.5 12.0 mz23-12rm060 60 5020% 0.1 0.5 2.0 mz23-50rm050 50 5020% 0.1 0.5 2.0 mz23-55rm060 60 5520% 0.1 0.65 4.0 dimensions(mm) part no. vmax.( vrms) fail model dmax tmax d f fig mz21-18rm110a 250 5.5 7.2 1.6 2.2 1 MZ21-18RM110B 250 5.5x5.5 1.8 2.2 2 mz22-12rm100 250 9.6 5.2 5.2 3 mz22-12rm080 250 9.6 5.2 5.2 3 mz23-12rm080 250 8.5 5.0 0.6 5.0 4 mz23-12rm060 300 8.5 5.0 0.6 5.0 4 mz23-50rm050 600 8.5 5.0 0.6 5.0 4 mz23-55rm060 650 9.0 5.0 0.6 5.0 4 .voltage of p o w e r supply :25 0vrms,in itial current:10arms,time:30minute. .voltage of p o w e r supply :60 0vrms,in itial current:15arms,time:30minute. .voltage of power supply:650vrms,in itial current:10arms,time:30minute. http:///
electronic alliance www.eaa.net.au 4 / 9 mz31 series for time delay start for lighting mz31 series of ptc thermistor are applicable to various types of fluorescent lamp, elec tronic ballast and electronic energy-saving lamp. the ptc can be connected across the lam p res onator witho u t changing the circuits. it can chang e hard star t of the balla s t and electro nic energy-saving lam p to preheated start and the preh eating tim e of the filament can com e up to 0.4-2 seconds, which will extend the service lif e of the fluorescent tube by over 3 tim es. the application of the ptc therm i stor to achieve preh ea ted star t is as f o llows: imm e diately after power is switched on, rt is in norm a l tem p erature state and its resistance is far lower than the c2 resistance. the current through c1 and rt forms a return circu it to preheat the filam e nt. after about 0.4-2 seconds, rt joule heat tem perature exceeds cu rie po int ts w and skips into high res i stan ce state of far higher than c2 resistance. the current passes through c 1 a nd c2 to for m a return circuit, which causes l resonance and produces high voltage to ligh t the f l uorescen t tube fig.1 examples of applications fig.2 component outline http:///
electronic alliance www.eaa.net.au 5 / 9 marking of partnumber spec.table part number switch temp.( ) resistance at+25 ( ? ) max. voltage(v ac ) mz31-03m101n500 10030% 500 mz31-03m151n500 15030% 500 mz31-03m271n650 27030% 650 mz31-03m391n650 39030% 650 mz31-03m681n800 68030% 800 mz31-03m102n800 100030% 800 mz31-03m152n900 150030% 900 mz31-03m332n900 805 330030% 900 mz31-05m82rn650 8230% 500 mz31-05m101n650 10030% 650 mz31-05m151n650 15030% 650 mz31-05m271n800 27030% 800 mz31-05m391n800 39030% 800 mz31-05m561n900 56030% 800 mz31-05m102n900 100030% 900 mz31-05m222n900 805 220030% 900 mz31-07m68rn650 6830% 500 mz31-07m82rn650 8230% 650 mz31-07m101n650 10030% 650 mz31-07m151n650 15030% 650 mz31-07m221n800 22030% 800 mz31-07m271n800 27030% 800 mz31-07m391n800 39030% 800 mz31-07m681n900 805 68030% 900 http:///
electronic alliance www.eaa.net.au 6 / 9 spec.table part number switch temp.( ) resistance at+25 ( ? ) max. voltage(v ac ) mz31-03p101n420 10030% 420 mz31-03p151n420 15030% 420 mz31-03p271n500 27030% 500 mz31-03p391n500 39030% 500 mz31-03p561n650 56030% 650 mz31-03p821n650 82030% 650 mz31-03p102n650 100030% 650 mz31-03p152n650 1205 150030% 650 mz31-05p70rn500 7030% 500 mz31-05p101n500 10030% 500 mz31-05p221n650 22030% 650 mz31-05p391n650 39030% 650 mz31-05p561n800 56030% 800 mz31-05p681n800 68030% 800 mz31-05p821n800 82030% 800 mz31-05p102n800 1205 100030% 800 mz31-07n68rn500 6830% 500 mz31-07n82rn650 8230% 650 mz31-07n101n650 10030% 650 mz31-07n151n650 15030% 650 mz31-07n221n800 22030% 800 mz31-07n271n800 27030% 800 mz31-07n391n800 39030% 800 mz31-07n681n900 1005 68030% 900 http:///
electronic alliance www.eaa.net.au 7 / 9 mz6 series for thermal protection mz6 series as a temperature i ndicator is small in size and little in calorific capacity. it is so useful for indicating any overheating of power transistors and thyristors in the power sources. fig.1 com p onect outline fig.2 resistance vs.temperature characteristics spec.table temperature indication part num be r 25 tr( ) tr-5 tr+5 vmax(v) imax(ma) mz6-501rt70 70 mz6-501rt80 80 mz6-501rt90 90 mz6-501rt100 100 mz6-501rt110 110 mz6-501rt120 120 mz6-501rt130 100 ? 130 500 ? 500 ? 16 100 http:///
electronic alliance www.eaa.net.au 8 / 9 zmz7 serial ptc degaussing thermistor outline ptc has been widely used in color tv sets and color monitors for its degaussing function.the degaussing themistor produced by our company features low residual current and quick response,which can quickly overcome the instant current inrush to create a clear and more vivid picture. * examples of application zmz72 monolithic ptc zmz73 biplate ptc *part number product seried electronic dem a gnetizing ptc therm i stor casing 1-w e lded casing;2-bakelite casing two-leg m onolithic ptc 3-ba kelite casin g three-leg biplate ptc 4-optical disk zero-power res i stan ce 18r-18 ? tolerance in res i stance m-30% m-20% x-+30%/-20% maxim u m operating voltage 270-270v http:///
electronic alliance www.eaa.net.au 9 / 9 specification current attenuation characteristics condition part no. rated zero power resistance( ? ) max.operating voltage(v) inrush (ap-p) 3 sec (map-p) 60sen (map-p) rated volt(v) load resis( ? ) mz71-5r0m140 520% 140 35 350 60 120 1 mz71-9r0m140 920% 140 25 300 50 120 7.3 mz71-12rm270 1220% 270 20 240 40 220 15 mz71-14rm270 1420% 270 15 200 35 220 10 mz71-18rm270 1820% 270 20 250 30 220 15 mz71-22rm270 2220% 270 10 150 30 220 10 mz71-27rm270 2720% 270 10 110 30 220 5 mz72-7r0m140 720% 140 25 300 35 120 20 mz72-12rm270 1220% 270 20 240 30 220 15 mz72-18rm270 1820% 270 20 250 25 220 10 mz73-9r0m140 920% 140 25 300 18 120 3.5 mz73-12rm270 1220% 270 25 200 15 220 20 mz73-14rm270 1420% 270 25 200 12 220 10 mz73-18rm270 1820% 270 20 250 10 220 10 mz73-27rm270 2720% 270 15 250 10 220 10 http:///
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