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NTC thermistors for temperature measurement
Probe assemblies
Series/Type: Date:
B57227 March 2006
(c) EPCOS AG 2006. 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
B57227 K227
Applications Electric motors Transformers Features Coated thermistor disk with shrunk sleeve insulation PTFE-insulated wires, AWG 26 UL approval (E69802) Options Alternative resistance ratings, rated temperatures, resistance tolerances and wire lengths available on request Delivery mode Bulk
Dimensional drawing
Dimensions in mm Approx. weight 5 g
General technical data Climatic category Max. power Resistance tolerance Rated temperature Dissipation factor Thermal cooling time constant Heat capacity Insulation resistance Test voltage (IEC 60068-1) (at 25 C) 55/155/56 200 10 100 approx. 5 approx. 30 approx. 150 >100 2.5
(in air) (in air) (V = 100 VDC) (t = 1 s)
P25 RR/RR TR th c Cth Rins Vtest
mW % C mW/K s mJ/K M kVAC
Electrical specification and ordering codes R100 1.8 k R25 32.762 k No. of R/T characteristic 2904 B25/100 K 4300 3% Ordering code B57227K0333A001
Please read Important notes and Cautions and warnings at the end of this document.
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Temperature measurement Probe assemblies
B57227 K227
Reliability data Test Storage in dry heat Standard IEC 60068-2-2 Test conditions R25/R25 (typical) < 2% Remarks No visible damage
Storage in damp heat, steady state Rapid temperature cycling Endurance Long-term stability (empirical value)
Storage at upper category temperature T: 155 C t: 1000 h IEC Temperature of air: 40 C 60068-2-78 Relative humidity of air: 93% Duration: 56 days IEC Lower test temperature: 55 C 60068-2-14 Upper test temperature: 155 C Number of cycles: 10 Pmax: 200 mW t: 1000 h Temperature: 100 C t: 10000 h
< 1%
No visible damage No visible damage No visible damage No visible damage
< 1%
< 2% < 3%
Please read Important notes and Cautions and warnings at the end of this document.
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Temperature measurement Probe assemblies
B57227 K227
R/T characteristics B57227K0333A001 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 2904 B25/100 = 4300 K, R25 = 32762 , TR = 100 C, RR/RR = 2% Rnom[] Rmin[] Rmax[] RR/RR[%] T[C] 3979200 2766400 1940900 1374000 981140 706590 512420 375640 276870 206160 154230 116510 88846 68340 53089 41554 32762 26020 20728 16623 13441 10930 8925 7329 6048 5014 4179 3498 2946 2492 2114 1800 1540 1322 1138 983.1 852.0 740.7 646.1 3090600 2166900 1532600 1093300 786400 570280 416300 307110 227730 170550 128290 97429 74672 57718 45046 35417 28045 22366 17889 14402 11689 9539 7817 6440 5332 4434 3707 3112 2629 2230 1897 1620 1382 1183 1016 875.6 757.1 656.7 571.6 4867900 3365800 2349200 1654700 1175900 842900 608530 444170 326020 241780 180170 135590 103020 78963 61131 47690 37479 29673 23567 18845 15194 12321 10034 8217 6764 5594 4651 3884 3264 2754 2331 1980 1698 1461 1260 1091 946.9 824.7 720.6 22.3 21.7 21.0 20.4 19.8 19.3 18.8 18.2 17.8 17.3 16.8 16.4 16.0 15.5 15.1 14.8 14.4 14.0 13.7 13.4 13.0 12.7 12.4 12.1 11.8 11.6 11.3 11.0 10.8 10.5 10.3 10.0 10.3 10.5 10.7 10.9 11.1 11.3 11.5 3.1 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.1 3.1 3.1 3.1 3.1 3.1 3.1 3.1 3.1 3.1 3.2 3.2 3.2 3.2 3.2 3.3 3.5 3.6 3.8 3.9 4.1 4.3
(%/K) 7.3 7.1 7.0 6.9 6.7 6.5 6.3 6.2 6.0 5.8 5.6 5.5 5.3 5.2 5.0 4.9 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 3.2 3.2 3.1 3.0 3.0 2.9 2.8 2.8 2.7
Please read Important notes and Cautions and warnings at the end of this document.
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Temperature measurement Probe assemblies
B57227 K227
B57227K0333A001 R/T No. T (C) 140.0 145.0 150.0 155.0 2904 B25/100 = 4300 K, R25 = 32762 , TR = 100 C, RR/RR = 2% Rnom[] Rmin[] Rmax[] RR/RR[%] T[C] 565.2 498.9 631.4 11.7 4.4 496.0 436.4 385.1 436.9 383.7 337.8 555.0 489.2 432.3 11.9 12.1 12.3 4.6 4.8 4.9
(%/K) 2.6 2.6 2.5 2.5
Please read Important notes and Cautions and warnings at the end of this document.
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Temperature measurement Probe assemblies
B57227 K227
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 before storage. Storage conditions in original packaging: storage temperature 25 C ... +45 C, relative humidity 75% annual mean, maximum 95%, dew precipitation is inadmissible. Do not store SMDs where they are exposed to heat or direct sunlight. Otherwise, the packing material may be deformed or SMDs may stick together, causing problems during mounting. Avoid contamination of thermistors surface during storage, handling and processing. Avoid storage of thermistor in harmful environments like corrosive gases (SOx, Cl etc). After opening the factory seals, such as polyvinyl-sealed packages, use the SMDs as soon as possible. Solder thermistors after shipment from EPCOS within the time specified: SMDs: 12 months Leaded components: 24 months Handling NTC thermistors must not be dropped. Chip-offs must not be caused during handling of NTCs. Components must not be touched with bare hands. Gloves are recommended. Avoid contamination of thermistor surface during handling. 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. Mounting When NTC thermistors are encapsulated with sealing material or overmolded with plastic material, the precautions given in chapter "Mounting instructions", "Sealing, potting and overmolding" must be observed. Electrode must not be scratched before/during/after the mounting process. Contacts and housings used for assembly with thermistor have to be clean before mounting. During operation, the thermistor's surface temperature can be very high (ICL). Ensure that adjacent components are placed at a sufficient distance from the thermistor to allow for proper cooling ot the thermistors. 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 this temperature. Make sure that thermistors (ICLs) are adequately ventilated to avoid overheating. Avoid contamination of thermistor surface during processing.
Please read Important notes and Cautions and warnings at the end of this document. Page 6 of 8
Temperature measurement Probe assemblies
B57227 K227
Operation Use thermistors only within the specified operating temperature range. Use thermistors only within the specified voltage and current ranges (ICLs). Environmental conditions must not harm the thermistors. Use thermistors only in normal atmospheric conditions. Contact of NTC thermistors with any liquids and solvents should be prevented. It must be ensured that no water enters the NTC thermistor (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. Be sure to provide an appropriate fail-safe function to prevent secondary product damage caused by malfunction (e.g. use VDR for limitation of overvoltage condition).
Please read Important notes and Cautions and warnings at the end of this document.
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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 passive 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 a passive electronic component could endanger human life or health (e.g. in accident prevention or life-saving 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 a passive 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. 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, EPCOS-JONES, Baoke, CeraDiode, CSSP, MLSC, PhaseCap, PhaseMod, SIFI, SIKOREL, SilverCap, SIMID, SIOV, SIP5D, SIP5K, UltraCap, 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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