PPTC-BK250-250-SZ
Positive Temperature Coefficient(PTC)Data Sheet
Description
This model provides radial resettable overcurrent protection with holding current 0.25A. This model is suitable
for applications with higher working voltage up to 250V.
Features
■Radial
leaded devices.
■
Over-current protection
■
High voltage surge capabilities
■Flame
retardant epoxy polymer insulating material meets UL94 V-0 requirement.
■Available
in lead-free version.
■
Meets MSL level 1, per J-STD-020
■Operating
Temperature: -40℃~+85℃
Applications
■Powered
supplies
■Industrial
controls
■Automotive
electronics control
■module
protection
■Security
systems
■Low
voltage telecom equipment
■Intelligent
appliance
■Power
supply
Part Number Code and Marking
BK
250 -
-
Lead Shape
Z=Straight
Body Shape
S=Square
Holding Current Rating
Voltage Rating
Brand BK
Revision：PPTC-BK250-250-SZ-001(A0)
http://brightking.yageo.com
PPTC-BK250-250-SZ
Dimensions (Unit: mm)
Part
Number
BK250-250
A
Max.
9.3
B
Max.
12.8
C
±0.6
5.1
D
Max.
4.6
E
Typ.
0.6
F
Min.
7.6
Style.
SZ
Electrical Characteristics
Part
Number
BK250-250
I
H
(A)
0.25
I
T
(A)
0.50
V
MAX
(V
AC
)
250
I
MAX
(A)
10
R
MAX
(Ω)
4.80
R
MIN
(Ω)
1.60
Pd
typ.
(W)
1.20
·I
H
= Hold current: maximum current device will pass without tripping in 25℃ still air.
·I
T
= Trip current: minimum current at which the device will trip in 25℃ still air.
·V
MAX
= Maximum voltage device can withstand without damage at rated current.
·I
MAX
= Maximum fault current device can withstand without damage at rated voltage.
·R
MAX
= Maximum resistance of device in initial (un-soldered) state.
·R
MIN
= Minimum resistance of device in initial (un-soldered) state.
·Pd
typ.
= Typical power dissipation from device when in the tripped state at 25℃ still air.
Revision：PPTC-BK250-250-SZ-001(A0)
http://brightking.yageo.com
PPTC-BK250-250-SZ
Polymeric PTC Selecting Guide
■Determine
the following operating parameters for the circuits:
·
Normal operating current (I
hold
)
·
Maximum interrupt current (I
max
)
·
Maximum circuit voltage (V
max
)
·
Normal operating temperature surrounding device (min℃/max℃)
■Select
the device from factor and dimension suitable for the application
■Compare
the maximum rating for V
max
and I
max
of the PPTC device with the circuit in application and make sure
the circuit’s requirement does not exceed the device rating.
■Check
that PPTC device’s trip time (time-to-trip) will protect the circuit.
■Verify
that the circuit operating temperature is within the PPTC device’s normal operating temperature range.
■Verify
that performance and suitability of the chosen PPTC device in the application.
!
WARNING
■Mechanical
Stress
·
PPTC devices will undergo a thermal expansion during fault condition. If PPTC devices are installed or placed in an application
where the space between PPTC devices and the surrounding materials (e.g., covering materials, packaging materials, encapsulate
materials and the like) is insufficient, it will cause an inhibiting effect upon the thermal expansion. Pressing, twisting, bending and
other kinds of mechanical stress will also adversely affect the performance of the PPTC devices, and shall not be used or applied.
■Chemical
Pollutants
·
Silicone-based oils, oils, solvents, gels, electrolytes, fuels, acids, and the like will adversely affect the properties of PPTC devices,
and shall not be used or applied.
■Electronic
and Thermal Effect
·
PPTC devices are secondary protection devices and are used solely for sporadic, accidental over-current or over-temperature
error condition, and shall NOT be used if or when constant or repeated fault conditions (such fault conditions may be caused by,
among others, incorrect pin-connection of a connector) or over-extensive trip events may occur.
·
PPTC devices are different from fuses and, when a fault condition occurs, will go into high-resistance state and do not open
circuit, in which case the voltage at such PPTC devices may reach a hazardous level.
·
Operation over the maximum rating or other forms of improper use may cause failure, arcing, flame and/or other damage to
the PPTC devices.
·
Conductive material contamination, such as metal particle, may induce shortage, flame or arcing.
·
Due to the inductance, the operation circuits may generate a circuit voltage (Ldi/dt) above the rated voltage of PPTC devices,
which shall not be used under such circumstances.
■General
·
Customers shall evaluate and test the properties of PPTC devices independently to verify and ensure that their individual
applications will be met.
·
The performance of PPTC devices will be adversely affected if they are improperly used under electronic, thermal and/or
mechanical procedures and/or conditions non-conformant to those recommended by manufacturer.
·
Customers shall be responsible for determining whether it is necessary to have back-up, failsafe and/or fool-proof protection
To avoid or minimize damage that may result from extra-ordinary, irregular function or failure of PPTC devices.
·
Any and all responsibilities and liabilities are disclaimed if any item under this notice of warning is not complied with.
Revision：PPTC-BK250-250-SZ-001(A0)
http://brightking.yageo.com
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