NTC thermistors for
temperature measurement
Probe assemblies
Series/Type:
B57227
Date:
March 2006
EPCOS AG 2006. Reproduction, publication and dissemination of this publication, enclosures hereto and the
information contained therein without EPCOS' prior express consent is prohibited.
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
(IEC 60068-1)
55/155/56
Max. power
(at 25
C)
P
25
200
mW
Resistance tolerance
R
R
/R
R
10
%
Rated temperature
T
R
100
C
Dissipation factor
(in air)
th
approx. 5
mW/K
Thermal cooling time constant
(in air)
c
approx. 30
s
Heat capacity
C
th
approx. 150
mJ/K
Insulation resistance
(V = 100 VDC)
R
ins
>100
M
Test voltage
(t = 1 s)
V
test
2.5
kVAC
Electrical specification and ordering codes
R
100
R
25
No. of R/T
characteristic
B
25/100
K
Ordering code
1.8 k
32.762 k
2904
4300
3%
B57227K0333A001
Temperature measurement
B57227
Probe assemblies
K227
Page 2 of 8
Please read Important notes and
Cautions and warnings at the end of this document.
Reliability data
Test
Standard
Test conditions
R
25
/R
25
(typical)
Remarks
Storage in
dry heat
IEC
60068-2-2
Storage at upper
category temperature
T: 155
C
t: 1000 h
< 2%
No visible
damage
Storage in damp
heat, steady state
IEC
60068-2-78
Temperature of air: 40
C
Relative humidity of air: 93%
Duration: 56 days
< 1%
No visible
damage
Rapid temperature
cycling
IEC
60068-2-14
Lower test temperature:
55
C
Upper test temperature: 155
C
Number of cycles: 10
< 1%
No visible
damage
Endurance
P
max
: 200 mW
t: 1000 h
< 2%
No visible
damage
Long-term stability
(empirical value)
Temperature: 100
C
t: 10000 h
< 3%
No visible
damage
Temperature measurement
B57227
Probe assemblies
K227
Page 3 of 8
Please read Important notes and
Cautions and warnings at the end of this document.
PDF 
ZIP
