EPCOS B57238 User Manual
查询B57238S0259L002供应商
N/RN
= ± 15 %
B57238Inrush Current Limiters
S238Insulation Voltage 1000 VDC for 1 s, ∆R
Applications
■ Switch-mode power supplies
■ Soft-start motors, e.g. in vacuum cleaners
Features
■ Close resistance tolerance,
improved insulation voltage
■ Useable in series connections up to 265 V
■ Coated thermistor disk
■ Kinked leads of tinned copper wire
■ Wide resistance range
■ UL approval (E69802)
rms
Delivery mode
Bulk (standard),
cardboard tape, reeled or in Ammo pack
Climatic category (IEC 60068-1)
Max. power at 25
Resistance tolerance ∆RN/R
Rated temperature T
°C P
max
N
B value tolerance ∆B/B
Dissipation factor (in air)
Thermal cooling time constant (in air) τ
Heat capacity C
Test voltage (t = 1 s) V
δ
th
c
th
T
17 max.
ø1
7,5
7 max.
23 max.
32+3
TNT0293-3
Dimensions in mm
Approx. weight 3 g
55/170/56
3,9
N
± 15 %
25
W
°C
± 3 %
approx. 20
approx. 80
approx. 1600
1000
mW/K
s
mJ/K
VDC
1)
R
25
Ω
I
max
(0 … 65 °C)
A
No. of
R/T characteristic
B
K
25/100
C
230 V
µF
1)
C
T
Parameters for
T
110 V
R(I)
µF
kn
1)
Ordering code
2,5 8,4 1202 2800 700 2800 0,98 – 1,36 B57238S0259L002
3,0 7,4 1203 2900 700 2800 1,04 – 1,36 B57238S0309L002
5,0 6,4 1207 2965 700 2800 1,23 – 1,37 B57238S0509L002
1) For details on the capacitance CT as well as on the parameters k and n refer to “Application Notes”, pages 40 –42.
140 05/02
N/RN
Reliability data
Test Standard Test conditions
Storage in
dry heat
IEC
60068-2-2
Storage at upper
category temperature
T: 170
°C
t: 1000 h
Storage in damp
heat, steady state
IEC
60068-2-3
Temperature of air: 40
Relative humidity of air: 93 %
Duration: 21 days
Rapid temperature
cycling
IEC
60068-2-14
Lower test temperature: – 55
Upper test temperature: 170
Number of cycles: 10
Endurance I = I
max
t: 1000 h
Cyclic
endurance
, 1000 cycles
I = I
max
On-time = 1 min
Cooling time = 6 min
Transient
load
Capacitance = C
Number of cycles: 1000
= ± 15 %
°C
T
∆R
25/R25
(typical)
< 10 % No visible
< 5 % No visible
< 10 % No visible
°C
°C
< 10 % No visible
< 10 % No visible
< 5 % No visible
B57238Inrush Current Limiters
S238Insulation Voltage 1000 VDC for 1 s, ∆R
Remarks
damage
damage
damage
damage
damage
damage
141 05/02
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