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NTC thermistors for temperature measurement
Probe assemblies
Series/Type: Date:
B57045K February 2009
(c) EPCOS AG 2009. Reproduction, publication and dissemination of this publication, enclosures hereto and the information contained therein without EPCOS' prior express consent is prohibited.
Temperature measurement Probe assemblies
B57045K K45
Applications Temperature compensation, measurement and control (chassis mounting) Features Cost-effective Good thermal coupling through screw-type case (thread M3) Electrically isolated aluminum case Tinned copper leads Options Tighter resistance tolerance available on request. Delivery mode Bulk
Dimensional drawing
Dimensions in mm Approx. weight 1 g General technical data Climatic category Max. power Resistance tolerance Rated temperature Dissipation factor Dissipation factor Thermal cooling time constant Thermal cooling time constant Torque Insulation resistance Test voltage (IEC 60068-1) (at 25 C) 55/125/56 450 10 25 approx. 9 approx. 20 approx. 75 approx. 15 approx. 0.5 > 100 2500
(in air) (on chassis) (in air) (on chassis) (V = 100 V DC) (t = 1 s)
P25 RR/RR TR th th c c Rins Vtest
mW % C mW/K mW/K s s Nm M V AC
Please read Cautions and warnings and Important notes at the end of this document.
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Temperature measurement Probe assemblies
B57045K K45
Electrical specification and ordering codes R25 1k 2.2 k 4.7 k 6.8 k 10 k 33 k 47 k 68 k 100 k 150 k Reliability data Test Storage in dry heat Standard IEC 60068-2-2 Test conditions R25/R25 (typical) < 3% Remarks No visible damage No. of R/T characteristic 1011 1013 4001 2903 2904 1012 4003 2005 2005 2005 B25/100 K 3730 3% 3900 3% 3950 3% 4200 3% 4300 3% 4300 3% 4450 3% 4600 3% 4600 3% 4600 3% Ordering code B57045K0102K000 B57045K0222K000 B57045K0472K000 B57045K0682K000 B57045K0103K000 B57045K0333K000 B57045K0473K000 B57045K0683K000 B57045K0104K000 B57045K0154K000
Storage in damp heat, steady state Endurance Long-term stability (empirical value)
Storage at upper category temperature T: 125 C t: 1000 h IEC Temperature of air: 40 C 60068-2-78 Relative humidity of air: 93% Duration: 56 days Pmax: 450 mW t: 1000 h Temperature: 100 C t: 10000 h
< 3%
No visible damage No visible damage No visible damage
< 3% < 5%
Please read Cautions and warnings and Important notes at the end of this document.
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Temperature measurement Probe assemblies
B57045K K45
R/T characteristics
R/T No. T (C) 55.0 50.0 45.0 40.0 35.0 30.0 25.0 20.0 15.0 10.0 5.0 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0 55.0 60.0 65.0 70.0 75.0 80.0 85.0 90.0 95.0 100.0 105.0 110.0 115.0 120.0 125.0
1011
1012
1013
B25/100 = 3730 K B25/100 = 4300 K B25/100 = 3900 K RT/R25 (%/K) RT/R25 (%/K) RT/R25 (%/K) 70.014 49.906 36.015 26.296 19.411 14.479 10.903 8.2923 6.3591 4.9204 3.8279 3.0029 2.3773 1.8959 1.5207 1.228 1.0000 0.81779 0.67341 0.55747 0.46357 0.3874 0.32368 0.272 0.23041 0.19604 0.16735 0.14342 0.12347 0.10668 0.092734 0.080903 0.070616 0.061826 0.054282 0.047793 0.042249 6.9 6.7 6.4 6.2 6.0 5.8 5.6 5.4 5.2 5.1 4.9 4.8 4.6 4.5 4.3 4.2 4.1 3.9 3.8 3.7 3.6 3.6 3.5 3.4 3.3 3.2 3.1 3.0 3.0 2.8 2.8 2.8 2.7 2.6 2.6 2.5 2.4 87.237 62.264 44.854 32.599 23.893 17.654 13.098 9.8059 7.4266 5.6677 4.3213 3.3208 2.5842 2.0238 1.5858 1.2507 1.0000 0.7964 0.64053 0.51772 0.41958 0.34172 0.27877 0.22861 0.18872 0.15645 0.13012 0.10863 0.091115 0.0767 0.064867 0.055047 0.046797 0.039904 0.034255 0.029498 0.025448 6.8 6.7 6.5 6.3 6.1 6.0 5.8 5.7 5.5 5.4 5.3 5.1 5.0 4.9 4.8 4.7 4.5 4.4 4.3 4.2 4.1 4.1 4.0 3.9 3.8 3.7 3.6 3.6 3.5 3.4 3.3 3.3 3.2 3.1 3.1 3.0 3.0 77.285 54.938 39.507 28.722 21.099 15.652 11.715 8.8541 6.7433 5.1815 4.0099 3.1283 2.4569 1.9438 1.5475 1.2403 1.0000 0.81104 0.66146 0.54254 0.44727 0.37067 0.30865 0.25825 0.21707 0.18323 0.15535 0.13223 0.11302 0.096951 0.083487 0.072139 0.062559 0.054425 0.047508 0.041594 0.036532 7.0 6.7 6.5 6.3 6.1 5.9 5.7 5.6 5.4 5.2 5.1 4.9 4.8 4.6 4.5 4.4 4.3 4.1 4.0 3.9 3.8 3.7 3.6 3.5 3.4 3.3 3.3 3.2 3.1 3.0 3.0 2.9 2.8 2.8 2.7 2.6 2.6
Please read Cautions and warnings and Important notes at the end of this document.
Page 4 of 13
Temperature measurement Probe assemblies
B57045K K45
R/T characteristics
R/T No. T (C) 55.0 50.0 45.0 40.0 35.0 30.0 25.0 20.0 15.0 10.0 5.0 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0 55.0 60.0 65.0 70.0 75.0 80.0 85.0 90.0 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0
2005
2903
2904
B25/100 = 4600 K B25/100 = 4200 K B25/100 = 4300 K RT/R25 (%/K) RT/R25 (%/K) RT/R25 (%/K) 120.22 85.48 61.004 43.712 31.459 22.746 16.49 12.071 8.8455 6.5446 4.8852 3.6781 2.7944 2.1391 1.6507 1.2823 1.0000 0.78393 0.61822 0.49053 0.39116 0.31371 0.25338 0.20565 0.16762 0.13726 0.11279 0.093053 0.077177 0.064263 0.053678 0.044996 0.037917 0.032063 0.027161 0.023079 0.01968 7.0 6.9 6.8 6.7 6.6 6.6 6.4 6.3 6.1 6.0 5.8 5.6 5.4 5.3 5.1 5.1 5.0 4.8 4.7 4.6 4.5 4.3 4.2 4.2 4.1 4.0 3.9 3.8 3.7 3.6 3.6 3.5 3.4 3.4 3.3 3.2 3.2 120.03 82.38 57.248 40.255 28.627 20.577 14.876 10.88 8.0808 6.0612 4.5649 3.4708 2.6625 2.0599 1.6069 1.2631 1.0000 0.79593 0.63796 0.51467 0.41887 0.34272 0.28081 0.23141 0.19211 0.16027 0.13421 0.11288 0.095326 0.080828 0.068916 0.058989 0.050701 0.043735 0.037778 0.032736 0.028513 7.7 7.4 7.2 7.0 6.7 6.6 6.4 6.1 5.9 5.8 5.6 5.4 5.2 5.1 4.9 4.8 4.6 4.5 4.4 4.2 4.1 4.0 3.9 3.8 3.7 3.6 3.5 3.4 3.3 3.2 3.2 3.1 3.0 3.0 2.9 2.8 2.7 121.46 84.439 59.243 41.938 29.947 21.567 15.641 11.466 8.451 6.2927 4.7077 3.5563 2.7119 2.086 1.6204 1.2683 1.0000 0.7942 0.63268 0.5074 0.41026 0.33363 0.27243 0.2237 0.18459 0.15305 0.12755 0.10677 0.089928 0.076068 0.064524 0.054941 0.047003 0.040358 0.034743 0.030007 0.026006 0.022609 0.01972 0.017251 0.015139 0.013321 0.011754
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7.4 7.2 7.1 6.9 6.7 6.6 6.3 6.2 6.0 5.9 5.7 5.5 5.3 5.1 5.0 4.8 4.7 4.6 4.5 4.3 4.2 4.1 4.0 3.9 3.8 3.7 3.6 3.5 3.4 3.3 3.3 3.2 3.1 3.0 3.0 2.9 2.8 2.8 2.7 2.6 2.6 2.5 2.5
Please read Cautions and warnings and Important notes at the end of this document.
Temperature measurement Probe assemblies
B57045K K45
Please read Cautions and warnings and Important notes at the end of this document.
Page 6 of 13
Temperature measurement Probe assemblies
B57045K K45
R/T characteristics
R/T No. T (C) 55.0 50.0 45.0 40.0 35.0 30.0 25.0 20.0 15.0 10.0 5.0 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0 55.0 60.0 65.0 70.0 75.0 80.0 85.0 90.0 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0
4001
4003
B25/100 = 3950 K B25/100 = 4450 K RT/R25 (%/K) RT/R25 (%/K) 88.052 61.65 43.727 31.395 22.802 16.742 12.367 9.2353 7.0079 5.3654 4.126 3.2 2.4986 1.9662 1.5596 1.2457 1.0000 0.80355 0.65346 0.53456 0.43966 0.36357 0.30183 0.25189 0.21136 0.17819 0.15089 0.12833 0.10948 0.093748 0.080764 0.069842 0.060455 0.052498 0.04574 0.039972 0.034984 7.3 7.0 6.8 6.5 6.3 6.2 6.0 5.6 5.4 5.4 5.2 5.0 4.9 4.7 4.6 4.5 4.4 4.2 4.1 4.0 3.9 3.8 3.7 3.6 3.5 3.4 3.3 3.2 3.1 3.0 2.9 2.9 2.9 2.8 2.7 2.7 2.6 103.81 73.707 52.723 37.988 27.565 20.142 14.801 10.976 8.1744 6.1407 4.6331 3.5243 2.6995 2.0831 1.6189 1.2666 1.0000 0.78351 0.62372 0.49937 0.40218 0.32557 0.26402 0.21527 0.17693 0.14616 0.12097 0.10053 0.083761 0.070039 0.058937 0.049777 0.042146 0.035803 0.030504 0.026067 0.022332 0.019186 0.016515 0.014253 0.012367 0.010758 0.0093933 6.8 6.7 6.6 6.5 6.4 6.2 6.1 5.9 5.8 5.7 5.5 5.4 5.3 5.1 5.0 4.9 4.7 4.6 4.5 4.4 4.3 4.2 4.1 4.0 3.9 3.8 3.7 3.7 3.6 3.5 3.4 3.4 3.3 3.2 3.2 3.1 3.0 3.0 2.9 2.9 2.8 2.8 2.7
Please read Cautions and warnings and Important notes at the end of this document.
Page 7 of 13
Temperature measurement Probe assemblies
B57045K K45
Please read Cautions and warnings and Important notes at the end of this document.
Page 8 of 13
Temperature measurement Probe assemblies
B57045K K45
Cautions and warnings General See "Important notes" at the end of this document. Storage Store thermistors only in original packaging. Do not open the package prior to storage. Storage conditions in original packaging: storage temperature 25 C ... +45 C, relative humidity 75% annual mean, <95% maximum 30 days per annum, dew precipitation is inadmissible. Do not store thermistors where they are exposed to heat or direct sunlight. Otherwise, the packing material may be deformed or components may stick together, causing problems during mounting. Avoid contamination of thermistor surface during storage, handling and processing. Avoid storage of thermistors in harmful environments like corrosive gases (SOx, Cl etc). Use the components as soon as possible after opening the factory seals, i.e. the polyvinyl-sealed packages. Solder thermistors within the time specified after shipment from EPCOS. For leaded components this is 24 months, for SMDs 12 months. Handling NTC thermistors must not be dropped. Chip-offs or any other damage must not be caused during handling of NTCs. Do not touch components with bare hands. Gloves are recommended. Avoid contamination of thermistor surface during handling. Bending / twisting leads A lead (wire) may be bent at a minimum distance of twice the wire's diameter plus 4 mm from the component head or housing. When bending ensure the wire is mechanically relieved at the component head or housing. The bending radius should be at least 0.75 mm. Twisting (torsion) by 180 of a lead bent by 90 is permissible at 6 mm from the bottom of the thermistor body. Soldering Use resin-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.
Please read Cautions and warnings and Important notes at the end of this document.
Page 9 of 13
Temperature measurement Probe assemblies
B57045K K45
Mounting Ensure that no thermo-mechanical stress occurs due to production processes (curing or overmolding processes) when thermistors are sealed, potted or overmolded or during their subsequent operation. The maximum temperature of the thermistor must not be exceeded. Ensure that the materials used (sealing/potting compound and plastic material) are chemically neutral. Electrodes/contacts must not be scratched or damaged before/during/after the mounting process. Contacts and housing used for assembly with the thermistor must be clean before mounting. Ensure that adjacent materials are designed for operation at temperatures comparable to the surface temperature of the thermistor. Be sure that surrounding parts and materials can withstand the temperature. Avoid contamination of the thermistor surface during processing. The connections of sensors (e.g. cable end, wire end, plug terminal) may only be exposed to an environment with normal atmospheric conditions. Tensile forces on cables or leads must be avoided during mounting and operation. Bending or twisting of cables or leads directly on the thermistor body is not permissible. Avoid using chemical substances as mounting aids. It must be ensured that no water or other liquids enter the NTC thermistors (e.g. through plug terminals). In particular, water based substances (e.g. soap suds) must not be used as mounting aids for sensors. Operation Use thermistors only within the specified operating temperature range. Use thermistors only within the specified power range. Environmental conditions must not harm the thermistors. Only use the thermistors under normal atmospheric conditions or within the specified conditions. Contact of NTC thermistors with any liquids and solvents should be prevented. It must be ensured that no water enters the NTC thermistors (e.g. through plug terminals). For measurement purposes (checking the specified resistance vs. temperature), the component must not be immersed in water but in suitable liquids (e.g. Galden). Avoid dewing and condensation unless thermistor is specified for these conditions. Bending or twisting of cables and/or wires is not permissible during operation of the sensor in the application. Be sure to provide an appropriate fail-safe function to prevent secondary product damage caused by malfunction. This listing does not claim to be complete, but merely reflects the experience of EPCOS AG.
Please read Cautions and warnings and Important notes at the end of this document.
Page 10 of 13
Temperature measurement Probe assemblies
B57045K K45
Symbols and terms Symbol A AWG B B25/100 Cth I N P25 Pdiss Pel Pmax RB/RB Rins RP RR RR/RR RS RT T T t TA Tmax Tmin Top TR Tsurf V Vins Vop Vtest English Area American Wire Gauge B value B value determined by resistance measurement at 25 C and 100 C Heat capacitance Current Number (integer) Maximum power at 25 C Power dissipation Electrical power Maximum power within stated temperature range Resistance tolerance caused by spread of B value Insulation resistance Parallel resistance Rated resistance Resistance tolerance Series resistance Resistance at temperature T (e.g. R25 = resistance at 25 C) Temperature Temperature tolerance Time Ambient temperature Upper category temperature Lower category temperature Operating temperature Rated temperature Surface temperature Voltage Insulation test voltage Operating voltage Test voltage German Flache Amerikanische Norm fur Drahtquerschnitte B-Wert B-Wert, ermittelt durch Widerstandsmessungen bei 25 C und 100 C Warmekapazitat Strom Anzahl (ganzzahliger Wert) Maximale Leistung bei 25 C Verlustleistung Elektrische Leistung Maximale Leistung im angegebenenTemperaturbereich Widerstandstoleranz, die durch die Streuung des B-Wertes verursacht wird Isolationswiderstand Parallelwiderstand Nennwiderstand Widerstandstoleranz Serienwiderstand Widerstand bei Temperatur T (z.B. R25 = Widerstand bei 25 C) Temperatur Temperaturtoleranz Zeit Umgebungstemperatur Obere Grenztemperatur (Kategorietemperatur) Untere Grenztemperatur (Kategorietemperatur) Betriebstemperatur Nenntemperatur Oberflachentemperatur Spannung Isolationsprufspannung Betriebsspannung Prufspannung
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Please read Cautions and warnings and Important notes at the end of this document.
Temperature measurement Probe assemblies
B57045K K45
Symbol th c a
English Temperature coefficient Tolerance, change Dissipation factor Thermal cooling time constant Thermal time constant
German Temperaturkoeffizient Toleranz, Anderung Warmeleitwert Thermische Abkuhlzeitkonstante Thermische Zeitkonstante
Abbreviations / Notes Symbol English Surface-mounted devices * + German Oberflachenmontierbares Bauelement
To be replaced by a number in ordering Platzhalter fur Zahl im Bestellnummerncodes, type designations etc. code oder fur die Typenbezeichnung. To be replaced by a letter. All dimensions are given in mm. The commas used in numerical values denote decimal points. Platzhalter fur einen Buchstaben. Alle Mae sind in mm angegeben. Verwendete Kommas in Zahlenwerten bezeichnen Dezimalpunkte.
Please read Cautions and warnings and Important notes at the end of this document.
Page 12 of 13
Important notes
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 requirements 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 incumbent on the customer to check and decide whether an EPCOS product with the properties described 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 Material Data Sheets on the Internet (www.epcos.com/material). Should you have any more detailed 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 foregoing for customer-specific products. 6. Unless otherwise agreed in individual contracts, all orders are subject to the current version of the "General Terms of Delivery for Products and Services in the Electrical Industry" published by the German Electrical and Electronics Industry Association (ZVEI). 7. The trade names EPCOS, BAOKE, Alu-X, CeraDiode, CSMP, CSSP, CTVS, DSSP, MiniBlue, MKK, MLSC, MotorCap, PCC, PhaseCap, PhaseCube, PhaseMod, SIFERRIT, SIFI, SIKOREL, SilverCap, SIMDAD, SIMID, SineFormer, SIOV, SIP5D, SIP5K, ThermoFuse, WindCap are trademarks registered or pending in Europe and in other countries. Further information will be found on the Internet at www.epcos.com/trademarks.
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