B57861S0104F040 Datasheet

B57861S December 2010

Part Datasheet
B57861S0104F040 B57861S0104F040 B57861S0104F040 (pdf)
Related Parts Information
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B57861S0103A039 B57861S0103A039 B57861S0103A039
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NTC thermistors for temperature measurement

Miniature sensors with bendable wires

Series/Type Date:

B57861S December 2010

EPCOS AG Reproduction, publication and dissemination of this publication, enclosures hereto and the information contained therein without EPCOS' prior express consent is prohibited.

Temperature measurement Miniature sensors with bendable wires

Applications Temperature measurement

Features Short response time High measuring accuracy Tight B value tolerances available Epoxy resin encapsulation PTFE-insulated leads of silver-plated nickel wire, AWG 30 Different lead length available 50 mm and 350 mm UL approval E69802

Options Alternative lead lengths on request

Delivery mode Bulk

Dimensional drawings Length 50 mm
350 mm

Dimensions in mm

General technical data

Climatic category Max. power Resistance tolerance Rated temperature Dissipation factor Thermal cooling time constant Heat capacity

IEC 60068-1 at 25 °C
in air in air

P25 TR Cth
55/155/56 60 ±1, ±3, ±5 25 approx. approx. 15 approx.

B57861S S861
mW % °C mW/K s mJ/K

Please read Cautions and warnings and Important notes at the end of this document.

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Temperature measurement Miniature sensors with bendable wires

B57861S S861
Electrical specification and ordering codes

Component length No. of R/T

B25/100 K

B value tolerance = resistance tolerance = ±1%
5 k 50 10 k 50 30 k 50
8016 8018
3988 3964

B value tolerance = 1%, resistance tolerance = ±1%
10 k 350
3988 ±1%

B value tolerance = resistance tolerance = ±1%, ±3% or ±5%
2 k 50 3 k 50 5 k 50 10 k 50 30 k 50 k 50 100 k 50
1008 8016 8018 2901 2014
3560 ±1% 3988 ±1% 3988 ±1% 3988 ±1% 3964 ±1% 3760 ±1% 4540 ±1%
+ = Resistance tolerance

F = ±1% H = ±3% J = ±5%
Ordering code

B57861S0502F045 B57861S0103F045 B57861S0303F045


B57861S0202+040 B57861S0302+040 B57861S0502+040 B57861S0103+040 B57861S0303+040 B57861S0503+040 B57861S0104+040

Reliability data


Storage in dry heat

Storage in damp heat, steady state

Rapid temperature cycling

Long-term stability empirical value

Standard Test conditions

IEC 60068-2-2

IEC 60068-2-78

IEC 60068-2-14

Storage at upper category temperature T 155 °C t 1000 h

Temperature of air 40 °C Relative humidity of air 93% Duration 56 days

Lower test temperature °C Upper test temperature 155 °C Number of cycles 100

Temperature 70 °C t 10000 h
typical < 2%


No visible damage

No visible damage

No visible damage

No visible damage

Please read Cautions and warnings and Important notes at the end of this document.

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Temperature measurement Miniature sensors with bendable wires

B57861S S861

R/T characteristics

R/T No.

T °C

B25/100 = 3560 K

B25/100 = 4540 K

B25/100 = 3760 K

α %/K RT/R25
α %/K RT/R25
α %/K
To be replaced by a number in ordering Platzhalter für Zahl im Bestellnummern-
codes, type designations etc.
code oder für die Typenbezeichnung.

To be replaced by a letter.

Platzhalter für einen Buchstaben.

All dimensions are given in mm.

Alle Maße sind in mm angegeben.

The commas used in numerical values Verwendete Kommas in Zahlenwerten
denote decimal points.
bezeichnen Dezimalpunkte.

Please read Cautions and warnings and Important notes at the end of this document.

Page 13 of 14

Important notes

The following applies to all products named in this publication:

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.

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.

The warnings, cautions and product-specific notes must be observed. 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 Should you have any more detailed questions, please contact our sales offices. 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. 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 . 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 trademarks registered or pending in Europe and in other countries. Further information will be found on the Internet at

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Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived B57861S0104F040 Datasheet file may be downloaded here without warranties.

Datasheet ID: B57861S0104F040 511524