B57238S220M51 EPCOS Inc, B57238S220M51 Datasheet - Page 3

• Manufacturer Part Number: B57238S220M51
• Description: CURRENT LIMITER INRSH 22 OHM 20%
• Manufacturer: EPCOS Inc
• Type: NTCr

Specifications of B57238S220M51

• R @ 25°c: 22 Ohm
• Current - Steady State Max: 4A
• Tolerance: ±20%
• Diameter: 0.629" (16mm)
• Lead Spacing: 0.295" (7.50mm)
• Resistance: 22 Ohms
• Termination Style: Radial
• Operating Temperature Range: - 55 C to + 170 C
• Current Rating: 4 Amps
• Power Rating: 3.9 W
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• R @ Current: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: B57238S 220M 51; B57238S0220M051

R
16
22
25
Reliability data
Test
Storage in
dry heat
Storage in damp
heat, steady state
Rapid temperature
cycling
Endurance
Cyclic
endurance
Transient
load
Cautions and warnings for ICLs
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.
1) For details on the capacitance C
Please read Important notes and
Cautions and warnings at the end of this document.
Inrush current limiters
ICLs, insulation voltage 1000 VDC for 1 s
25
I
(0...65 C)
A
4.0
4.0
3.4
max
No. of
R/T char-
acteristic
1209
1210
1210
Standard
IEC
60068-2-2
IEC
60068-2-78
IEC
60068-2-14
test
as well as on the parameters k and n refer to "Application Notes", chapters 2.6 and 2.7.
B
K
3165
3265
3265
25/100
Test conditions
Storage at upper
category temperature
T: 170 C
t: 1000 h
Temperature of air: 40 C
Relative humidity of air: 93%
Duration: 21 days
Lower test temperature:
Upper test temperature: 170 C
Number of cycles: 10
I = I
t: 1000 h
I = I
On-time = 1 min
Cooling time = 6 min
Capacitance = C
Number of cycles: 1000
max
max
C
230 V
700
700
700
, 1000 cycles
F
test
1)
Page 3 of 6
C
110 V
2800
2800
2800
F
test
test
1)
Param.
for R(I)
k
1.69
1.84
1.88
55 C
1)
Param.
for R(I)
n
1.39
1.42
1.40
(typical)
< 10%
< 5%
< 10%
< 10%
< 10%
< 5%
R
1)
25
/R
Ordering code
B57238S0160L002
B57238S0220L002
B57238S0250L002
25
Remarks
No visible
damage
No visible
damage
No visible
damage
No visible
damage
No visible
damage
No visible
damage
B57238
S238