NTCthermistorsfor
temperaturemeasurement
Leaded NTC thermistors,
lead spacing 2.5 mm
Series/Type: B57891M
Date: January 2018
EPCOS AG 2018. Reproduction, publication and dissemination of this publication, enclosures hereto and the
information contained therein without EPCOS' prior express consent is prohibited.
EPCOS AG is a TDK Group Company.Temperaturemeasurementandcompensation B57891M
LeadedNTCthermistors,leadspacing2.5mm M891
Applications Dimensionaldrawing
Temperature measurement and
compensation
Features
Wide resistance range
Cost-effective
Lacquer-coated thermistor disk
Leads: copper-clad Fe wire, tinned
Marked with resistance and tolerance
Options
Lead spacing 5 mm available on request
Deliverymode
Bulk (standard), cardboard tape, reeled or in
Ammo pack on request
Dimensions in mm
Approx. weight 200 mg
Generaltechnicaldata
Climatic category (IEC 60068-1) 40/125/56
Max. power (at 25C) P 200 mW
25
Resistance tolerance R /R 5,10 %
R R
Rated temperature T 25 C
R
Dissipation factor (in air) approx. 3.5 mW/K
th
Thermal cooling time constant (in air) approx. 12 s
c
Heat capacity C approx. 40 mJ/K
th
Electricalspecificationandorderingcodes
R No. of R/T B Ordering code
25 25/100
characteristic K
1 k 1009 39303% B57891M0102+000
1.5 k 1008 35603% B57891M0152+000
2.2 k 1013 39003% B57891M0222+000
3.3 k 2003 39803% B57891M0332+000
4.7 k 2003 39803% B57891M0472+000
6.8 k 2003 39803% B57891M0682+000
10 k 4901 39503% B57891M0103+000
15 k 2004 41003% B57891M0153+000
22 k 2904 43003% B57891M0223+000
+ = Resistance tolerance
J = 5%
K = 10%
Please read Cautions and warnings and Page 2 of 29
Important notesat the end of this document.