NTC thermistors for
inrush current limiting
Leaded and coated disks, P27 series
Series/Type:
Date:
B57127P0***M301
November 2015
© EPCOS AG 2015. 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.
Inrush current limiters
ICLs
B57127P0***M301
P27
Applications
Inrush current limiting, e.g. in switch-mode power
supplies, soft-start motors
Features
Leaded and coated NTC thermistors
Tinned copper wire, kinked
Coating material flame retardant to UL 94 V-0
Component marking includes the manufacturer's
logo, resistance value and date code
Highly stable electrical characteristics
Approvals
UL 1434 (file number E69802)
Options
Resistance tolerance <20% and alternative lead
configurations available on request
Delivery mode
Bulk
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)
Dimensional drawing
Dimensions in mm
Approx. weight 10 g
(in air)
(in air)
P
max
∆R
R
/R
R
T
R
δ
th
τ
c
C
th
55/170/21
10.0
±20
25
approx. 50
approx. 200
approx. 10000
W
%
°C
mW/K
s
mJ/K
Electrical specification and ordering codes
R
25
I
test
I
max
(0 ...
25
°C)
A
24
22
16
12
11
9
C
test1)
280 V AC
µF
1300
1300
1300
1300
1300
1300
Maximum
C
test1)
C
test1)
240 V AC 120 V AC energy
µF
3500
3500
3500
3500
3500
3500
µF
16000
16000
16000
16000
16000
16000
J
200
200
200
200
200
200
R
min
Ordering code
(@ I
test
,
25
°C)
Ω
0.011
0.013
0.022
0.033
0.045
0.058
B57127P0508M301
B57127P0109M301
B57127P0209M301
B57127P0509M301
B57127P0709M301
B57127P0100M301
Ω
0.5
1
2
5
7
10
A
30
30
23
20
17
15
1) For details on the capacitance C
test
please refer to "Application notes", chapter 1.6.
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 2 of 19
Inrush current limiters
ICLs
B57127P0***M301
P27
Reliability data
Test
Storage in
dry heat
Standard
IEC
60068-2-2
Test conditions
∆R
25
/R
25
(typical)
< 20%
Remarks
No visible
damage
Storage in damp
heat, steady state
Thermal schock
Endurance
High current
endurance
Cyclic
endurance
Maximum
permissible
capacitance test
Storage at upper
category temperature
T: 170
°C
t: 1000 h
IEC
Temperature of air: 40
°C
60068-2-78 Relative humidity of air: 93%
Duration: 21 days
IEC
Lower test temperature: 55
°C
60068-2-14 t: 30 min
Upper test temperature: 170
°C
t: 30 min
Time to change from lower to
upper temperature: < 30 s
Number of cycles: 10
IEC
Ambient temperature: 25
±5 °C
60539-1
I = I
max
t: 1000 h
Ambient temperature: 25
±5 °C
I = I
test
t: 50 h
IEC
Ambient temperature: 25
±5 °C
60539-1
I = I
max
On-time = 1 min
Cooling time = 5 min
Number of cycles: 1000
IEC
Ambient temperature: 25
±5 °C
60539-1
Capacitance = C
test
Number of cycles: 1000
< 20%
No visible
damage
No visible
damage
< 20%
< 20%
No visible
damage
No visible
damage
No visible
damage
< 20%
< 20%
< 20%
No visible
damage
Note
The self-heating of a thermistor during operation depends on the load applied and the
applicable dissipation factor.
When loaded with maximum allowable current/power and the specified dissipation factor is
taken as a basis, the NTC thermistor may reach a mean temperature of up to 250
°C.
The heat developed during operation will also be dissipated through the lead wires. So the
contact areas, too, may become quite hot at maximum load.
When mounting NTC thermistors you have to ensure that there is an adequate distance
between the thermistor and all parts which are sensitive to heat or combustible.
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 3 of 19
Inrush current limiters
ICLs
B57127P0***M301
P27
Resistance versus temperature
P27 series
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 4 of 19
Inrush current limiters
ICLs
B57127P0***M301
P27
Resistance versus current
P27 series
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 5 of 19
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