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PDF B57971S Data sheet ( Hoja de datos )
| Número de pieza | B57971S | |
| Descripción | NTC thermistors | |
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NTC thermistors for
temperature measurement
Leaded NTC thermistors,
lead spacing 2.5 mm
Series/Type:
Date:
B57971S
February 2009
www.DataSheet4U.com
© EPCOS AG 2009. Reproduction, publication and dissemination of this publication, enclosures hereto and the
information contained therein without EPCOS' prior express consent is prohibited.
1 page  
Temperature measurement
Leaded NTC thermistors, lead spacing 2.5 mm
B57971S
S971
R/T No.
T (°C)
160.0
165.0
170.0
175.0
180.0
185.0
190.0
195.0
200.0
205.0
210.0
215.0
220.0
225.0
230.0
235.0
240.0
245.0
250.0
1008
8016
8018
B25/100 = 3560 K
B25/100 = 3988 K
B25/100 = 3964 K
RT/R25
0.02279
0.020667
α (%/K) RT/R25
2.0
2.0
α (%/K) RT/R25
α (%/K)
0.01878
0.01709
0.015582
0.014227
0.013012
0.011934
0.010964
0.0101
0.0093191
0.0085949
1.9
1.9
1.8
1.8
1.8
1.7
1.7
1.7
1.6
1.6
0.0079384
0.0073411
0.006798
0.0063087
0.0058623
0.0054487
0.0050705
1.6
1.5
1.5
1.5
1.5
1.4
1.4
www.DataSheet4U.com
Please read Cautions and warnings and
Important notes at the end of this document.
Page 5 of 17
5 Page 
Temperature measurement
Leaded NTC thermistors, lead spacing 2.5 mm
B57971S
S971
Bending strength: Test Ub:
Two 90°-bends in opposite directions at a weight of 0.25 kg.
Torsional strength: Test Uc: severity 2
The lead is bent by 90° at a distance of 6 to 6.5 mm from the thermistor body.
The bending radius of the leads should be approx. 0.75 mm. Two torsions of
180° each (severity 2).
When subjecting leads to mechanical stress, the following should be observed:
Tensile stress on leads
During mounting and operation tensile forces on the leads are to be avoided.
Bending of leads
Bending of the leads directly on the thermistor body is not permissible.
A lead may be bent at a minimum distance of twice the wire's diameter +2 mm from the solder
joint on the thermistor body. During bending the wire must be mechanically relieved at its outlet.
The bending radius should be at least 0.75 mm.
Twisting of leads
The twisting (torsion) by 180° of a lead bent by 90° is permissible at 6 mm from the bottom of the
thermistor body.
4 Sealing and potting
When thermistors are sealed, potted or overmolded, there must be no mechanical stress caused
by thermal expansion during the production process (curing / overmolding process) and during
later operation. The upper category temperature of the thermistor must not be exceeded. Ensure
that the materials used (sealing / potting compound and plastic material) are chemically neutral.
5 Cleaning
If cleaning is necessary, mild cleaning agents such as ethyl alcohol and cleaning gasoline are
wwrewco.DmamteanSdheede.t4CUle.acnoimng agents based on water are not allowed. Ultrasonic cleaning methods are
permissible.
6 Storage
In order to maintain their solderability, thermistors must be stored in a non-corrosive atmosphere.
Humidity, temperature and container materials are critical factors.
Do not store SMDs where they are exposed to heat or direct sunlight. Otherwise, the packing ma-
terial may be deformed or SMDs may stick together, causing problems during mounting. After
opening the factory seals, such as polyvinyl-sealed packages, use the SMDs as soon as possible.
Please read Cautions and warnings and
Important notes at the end of this document.
Page 11 of 17
11 Page | ||
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| PDF Descargar | [ Datasheet B57971S.PDF ] | |
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