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ptc thermistors for overcurrent protection leaded disks, uncoated, 380 to 1000 v series/type: b597** date: june 2011 ? epcos ag 2011. reproduction, publication and dissemination of this publication, enclosures hereto and the information contained therein without epcos' prior express consent is prohibited.
applications overcurrent protection short circuit protection features lead-free terminals manufacturer's logo, date code and type designation stamped on in black ul approval to ul 1434 with v max = 420 v and v r = 380 v (file number e69802), except b758 rohs-compatible delivery mode cardboard strips (standard) cardboard tape reeled or in ammo pack on request dimensional drawing dimensions (mm) type w max h max th max b750 12.5 16.5 5.0 b751 12.5 16.5 7.0 b752 12.5 16.5 7.0 b753 12.5 16.5 7.0 b754 12.5 16.5 7.0 b755 12.5 16.5 7.0 b758 12.5 16.5 7.0 b770 8.5 12.0 7.0 b771 8.5 12.0 7.0 b772 8.5 12.0 7.0 b773 8.5 12.0 7.0 b774 8.5 12.0 7.0 general technical data switching cycles n 100 operating temperature range (v = 0) t op 40/+125 c operating temperature range (v = v max ) t op 0/+60 c overcurrent protection leaded disks, uncoated, 380 v to 1000 v b750 ... b774 page 2 of 13 please read cautions and warnings and important notes at the end of this document.
electrical specifications and ordering codes type i r ma i s ma i smax (v = v max ) a t s (v max , i smax ) s i r (typ.) (v = v max ) ma r r w r min w approvals ordering code v max = 440 v, v r = 380 v, t ref = 120 c, d r r = 25 % b750 123 245 4.0 < 6 4.0 25 13 x b59750b0120a070 b751 87 173 4.0 < 4 3.5 50 26 x b59751b0120a070 b752 69 137 4.0 < 4 3.5 80 42 x b59752b0120a070 b753 56 112 4.0 < 3 3.0 120 63 x b59753b0120a070 b754 50 100 4.0 < 3 3.0 150 68 x b59754b0120a070 b770 64 127 2.8 < 4 3.5 70 45 x b59770b0120a070 b771 49 97 2.8 < 3 2.5 120 76 x b59771b0120a070 b772 43 86 2.8 < 3 2.5 150 96 x B59772B0120A070 v max = 550 v, v r = 500 v, t ref = 115 c, d r r = 25 % b755 28 55 1.4 < 3 2.0 500 230 x b59755b0115a070 b774 16 32 1.0 < 2 1.5 1100 700 x b59774b0115a070 v max = 550 v, v r = 500 v, t ref = 120 c, d r r = 25 % b773 24 48 1.0 < 3 2.0 500 320 x b59773b0120a070 v max = 1000 v, v r = 1000 v, t ref = 110 c, d r r = 33 % b758 8 17 0.5 < 3 3.0 7500 3380 b59758b0110a070 overcurrent protection leaded disks, uncoated, 380 v to 1000 v b750 ... b774 page 3 of 13 please read cautions and warnings and important notes at the end of this document.
reliability data test standard test conditions d r 25 /r 25 electrical endurance, cycling iec 60738-1 room temperature, i smax ; v max number of cycles: 100 < 25% electrical endurance, constant iec 60738-1 storage at v max /t op,max (v max ) test duration: 1000 h < 25% damp heat iec 60738-1 temperature of air: 40 c relative humidity of air: 93% duration: 56 days test according to iec 60068-2-78 < 10% rapid change of temperature iec 60738-1 t 1 = t op,min (0 v), t 2 = t op,max (0 v) number of cycles: 5 test duration: 30 min test according to iec 60068-2-14, test na < 10% vibration iec 60738-1 frequency range: 10 to 55 hz displacement amplitude: 0.75 mm test duration: 3 2 h test according to iec 60068-2-6, test fc < 5% shock iec 60738-1 acceleration: 390 m/s 2 pulse duration: 6 ms; 6 4000 pulses < 5% climatic sequence iec 60738-1 dry heat: t = t op,max (0 v) test duration: 16 h damp heat first cycle cold: t = t op,min (0 v) test duration: 2 h damp heat 5 cycles tests performed according to iec 60068-2-30 < 10% overcurrent protection leaded disks, uncoated, 380 v to 1000 v b750 ... b774 page 4 of 13 please read cautions and warnings and important notes at the end of this document.
characteristics (typical) ptc resistance r ptc versus ptc temperature t ptc (measured at low signal voltage) ptc current i ptc versus ptc voltage v ptc (measured at 25 c in still air) switching time t s versus switching current i s (measured at 25 c in still air) rated current i r versus ambient temperature t a (measured in still air) overcurrent protection leaded disks, uncoated, 380 v to 1000 v b750 ... b774 page 5 of 13 please read cautions and warnings and important notes at the end of this document.
characteristics (typical) ptc resistance r ptc versus ptc temperature t ptc (measured at low signal voltage) ptc current i ptc versus ptc voltage v ptc (measured at 25 c in still air) switching time t s versus switching current i s (measured at 25 c in still air) rated current i r versus ambient temperature t a (measured in still air) overcurrent protection leaded disks, uncoated, 380 v to 1000 v b750 ... b774 page 6 of 13 please read cautions and warnings and important notes at the end of this document.
characteristics (typical) ptc resistance r ptc versus ptc temperature t ptc (measured at low signal voltage) ptc current i ptc versus ptc voltage v ptc (measured at 25 c in still air) switching time t s versus switching current i s (measured at 25 c in still air) rated current i r versus ambient temperature t a (measured in still air) overcurrent protection leaded disks, uncoated, 380 v to 1000 v b750 ... b774 page 7 of 13 please read cautions and warnings and important notes at the end of this document.
characteristics (typical) ptc resistance r ptc versus ptc temperature t ptc (measured at low signal voltage) ptc current i ptc versus ptc voltage v ptc (measured at 25 c in still air) switching time t s versus switching current i s (measured at 25 c in still air) rated current i r versus ambient temperature t a (measured in still air) overcurrent protection leaded disks, uncoated, 380 v to 1000 v b750 ... b774 page 8 of 13 please read cautions and warnings and important notes at the end of this document.
cautions and warnings general epcos thermistors are designed for specific applications and should not be used for purposes not identified in our specifications, application notes and data books unless otherwise agreed with epcos during the design-in-phase. ensure suitability of thermistor through reliability testing during the design-in phase. the ther- mistors should be evaluated taking into consideration worst-case conditions. storage store thermistors only in original packaging. do not open the package before storage. storage conditions in original packaging: storage temperature 25 c ... +45 c, relative hu- midity 75% annual mean, maximum 95%, dew precipitation is inadmissible. avoid contamination of thermistors surface during storage, handling and processing. avoid storage of thermistor in harmful environment with effect on function on long-term opera- tion (examples given under operation precautions). use thermistor within the following period after delivery: through-hole devices (housed and leaded ptcs): 24 months motor protection sensors, glass-encapsulated sensors and probe assemblies: 24 months telecom pair and quattro protectors (tpp, tqp): 24 months leadless ptc thermistors for pressure contacting: 12 months leadless ptc thermistors for soldering: 6 months smds in eia sizes 3225 and 4032, and for ptcs with metal tags: 24 months smds in eia sizes 0402, 0603, 0805 and 1210: 12 months handling ptcs must not be dropped. chip-offs must not be caused during handling of ptcs. components must not be touched with bare hands. gloves are recommended. avoid contamination of thermistor surface during handling. soldering (where applicable) use rosin-type flux or non-activated flux. insufficient preheating may cause ceramic cracks. rapid cooling by dipping in solvent is not recommended. complete removal of flux is recommended. standard ptc heaters are not suitable for soldering. overcurrent protection leaded disks, uncoated, 380 v to 1000 v b750 ... b774 page 9 of 13 please read cautions and warnings and important notes at the end of this document.
mounting electrode must not be scratched before/during/after the mounting process. contacts and housing used for assembly with thermistor have to be clean before mounting. es- pecially grease or oil must be removed. when ptc thermistors are encapsulated with sealing material, the precautions given in chapter "mounting instructions", "sealing and potting" must be observed. when the thermistor is mounted, there must not be any foreign body between the electrode of the thermistor and the clamping contact. the minimum force of the clamping contacts pressing against the ptc must be 10 n. during operation, the thermistor?s surface temperature can be very high. ensure that adjacent components are placed at a sufficient distance from the thermistor to allow for proper cooling at the thermistors. ensure that adjacent materials are designed for operation at temperatures comparable to the surface temperature of thermistor. be sure that surrounding parts and materials can withstand this temperature. avoid contamination of thermistor surface during processing. operation use thermistors only within the specified temperature operating range. use thermistors only within the specified voltage and current ranges. environmental conditions must not harm the thermistors. use thermistors only in normal at- mospheric conditions. avoid use in deoxidizing gases (chlorine gas, hydrogen sulfide gas, am- monia gas, sulfuric acid gas etc), corrosive agents, humid or salty conditions. contact with any liquids and solvents should be prevented. be sure to provide an appropriate fail-safe function to prevent secondary product damage caused by abnormal function (e.g. use vdr for limitation of overvoltage condition). overcurrent protection leaded disks, uncoated, 380 v to 1000 v b750 ... b774 page 10 of 13 please read cautions and warnings and important notes at the end of this document.
symbols and terms a area c th heat capacity f frequency i current i max maximum current i r rated current i ptc ptc current i r residual currrent i r,oil residual currrent in oil (for level sensors) i r,air residual currrent in air (for level sensors) i rms root-mean-square value of current i s switching current i smax maximum switching current lct lower category temperature n number (integer) n c operating cycles at v max , charging of capacitor n f switching cycles at v max , failure mode p power p 25 maximum power at 25 c p el electrical power p diss dissipation power r g generator internal resistance r min minimum resistance r r rated resistance d r r tolerance of r r r p parallel resistance r ptc ptc resistance r ref reference resistance r s series resistance r 25 resistance at 25 c r 25,match resistance matching per reel/ packing unit at 25 c d r 25 tolerance of r 25 t temperature t time t a ambient temperature t a thermal threshold time t c ferroelectric curie temperature overcurrent protection leaded disks, uncoated, 380 v to 1000 v b750 ... b774 page 11 of 13 please read cautions and warnings and important notes at the end of this document.
t e settling time (for level sensors) t r rated temperature t sense sensing temperature t op operating temperature t ptc ptc temperature t r response time t ref reference temperature t rmin temperature at minimum resistance t s switching time t surf surface temperature uct upper category temperature v or v el voltage (with subscript only for distinction from volume) v rms root-mean-square value of voltage v bd breakdown voltage v ins insulation test voltage v link,max maximum link voltage v max maximum operating voltage v max,dyn maximum dynamic (short-time) operating voltage v meas measuring voltage v meas,max maximum measuring voltage v r rated voltage v ptc voltage drop across a ptc thermistor a temperature coefficient d tolerance, change d th dissipation factor t th thermal cooling time constant l failure rate lead spacing (in mm) abbreviations / notes surface-mount devices * to be replaced by a number in ordering codes, type designations etc. + to be replaced by a letter all dimensions are given in mm. the commas used in numerical values denote decimal points. overcurrent protection leaded disks, uncoated, 380 v to 1000 v b750 ... b774 page 12 of 13 please read cautions and warnings and important notes at the end of this document.
the following applies to all products named in this publication: 1. some parts of this publication contain statements about the suitability of our products for certain areas of application . these statements are based on our knowledge of typical re- quirements that are often placed on our products in the areas of application concerned. we nevertheless expressly point out that such statements cannot be regarded as binding statements about the suitability of our products for a particular customer application . as a rule, epcos is either unfamiliar with individual customer applications or less familiar with them than the customers themselves. for these reasons, it is always ultimately incum- bent on the customer to check and decide whether an epcos product with the properties de- scribed in the product specification is suitable for use in a particular customer application. 2. we also point out that in individual cases, a malfunction of electronic components or failure before the end of their usual service life cannot be completely ruled out in the current state of the art, even if they are operated as specified . in customer applications requiring a very high level of operational safety and especially in customer applications in which the malfunction or failure of an electronic component could endanger human life or health (e.g. in accident prevention or lifesaving systems), it must therefore be ensured by means of suitable design of the customer application or other action taken by the customer (e.g. installation of protective circuitry or redundancy) that no injury or damage is sustained by third parties in the event of malfunction or failure of an electronic component. 3. the warnings, cautions and product-specific notes must be observed. 4. in order to satisfy certain technical requirements, some of the products described in this publication may contain substances subject to restrictions in certain jurisdictions (e.g. because they are classed as hazardous) . useful information on this will be found in our ma- terial data sheets on the internet (www.epcos.com/material). should you have any more de- tailed questions, please contact our sales offices. 5. we constantly strive to improve our products. consequently, the products described in this publication may change from time to time . the same is true of the corresponding product specifications. please check therefore to what extent product descriptions and specifications contained in this publication are still applicable before or when you place an order. we also reserve the right to discontinue production and delivery of products . consequently, we cannot guarantee that all products named in this publication will always be available. the aforementioned does not apply in the case of individual agreements deviating from the fore- going for customer-specific products. 6. unless otherwise agreed in individual contracts, all orders are subject to the current ver- sion of the "general terms of delivery for products and services in the electrical in- dustry" published by the german electrical and electronics industry association (zvei) . 7. the trade names epcos, baoke, alu-x, ceradiode, csmp, cssp, ctvs, deltacap, digisimic, dssp, formfit, miniblue, minicell, mkk, mkd, mlsc, motorcap, pcc, phasecap, phasecube, phasemod, phicap, siferrit, sifi, sikorel, silvercap, simdad, simic, simid, sineformer, siov, sip5d, sip5k, thermofuse, windcap are trade- marks registered or pending in europe and in other countries. further information will be found on the internet at www.epcos.com/trademarks. important notes page 13 of 13

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