NTC thermistors for
temperature measurement
Leadless NTCs
Series/Type:
B57350
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.
1) Depends on mounting situation
Applications
Automotive electronics, e.g.
measurement of cooling water
and oil temperature
Features
Front surfaces silver-plated
For clamp contacting
Options
Alternative resistance ratings,
rated temperatures and resistance tolerances
available on request
Delivery mode
Bulk
Dimensional drawing
D = 3.5
0.3 mm
L = 1.3
0.4 mm
Approx. weight 75 mg
General technical data
Climatic category
(IEC 60068-1)
55/155/21
Max. power
(at 25
C)
P
25
180
mW
Resistance tolerance
R
R
/R
R
5
%
Rated temperature
T
R
100
C
Dissipation factor
(in air)
th
1)
approx. 2.5
mW/K
Thermal cooling time constant
(in air)
c
1)
approx. 18
s
Heat capacity
C
th
1)
approx. 45
mJ/K
Electrical specification and ordering codes
R
100
R
25
No. of R/T
characteristic
B
25/100
K
Ordering code
70
990.2
1009
3930
1.5%
B57350K0102J000
Temperature measurement
B57350
Leadless NTCs
K350
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
< 3%
No visible
damage
Storage in damp
heat, steady state
IEC
60068-2-78
Temperature of air: 40
C
Relative humidity of air: 93%
Duration: 21 days
< 3%
No visible
damage
Rapid temperature
cycling
IEC
60068-2-14
Lower test temperature:
55
C
Upper test temperature: 155
C
Number of cycles: 100
< 3%
No visible
damage
Endurance
P
max
: 180 mW
t: 1000 h
< 3%
No visible
damage
Long-term stability
(empirical value)
Temperature: 125
C
t: 10000 h
< 5%
No visible
damage
Temperature measurement
B57350
Leadless NTCs
K350
Page 3 of 8
Please read Important notes and
Cautions and warnings at the end of this document.