BFC237179473 Vishay, BFC237179473 Datasheet - Page 24

• Manufacturer Part Number: BFC237179473
• Description: CAPACITOR POLYESTER 0.047UF, 250V, RADIAL
• Manufacturer: Vishay
• Series: MKT371r

Specifications of BFC237179473

• Capacitor Dielectric Type: Polyester
• Capacitance Tolerance: ± 5%
• Voltage Rating: 250VDC
• Capacitor Case Style: Radial Leaded
• No. Of Pins: 2
• Capacitance: 0.047µF
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

APPLICATION NOTE AND LIMITING CONDITIONS
These capacitors are not suitable for mains applications as across-the-line capacitors without additional protection, as described
hereunder. These mains applications are strictly regulated in safety standards and therefore electromagnetic interference
suppression capacitors conforming the standards must be used.
For capacitors connected in parallel, normally the proof voltage and possibly the rated voltage must be reduced. For information
depending of the capacitance value and the number of parallel connections contact:
To select the capacitor for a certain application, the following
conditions must be checked:
1. The peak voltage (U
2. The peak-to-peak voltage (U
3. The voltage peak slope (dU/dt) shall not exceed the rated voltage pulse slope in an RC-circuit at rated voltage and without
4. The maximum component surface temperature rise must be lower than the limits (see graph Max. Allowed Component
5. Since in circuits used at voltages over 280 V peak-to-peak the risk for an intrinsically active flammability after a capacitor
6. When using these capacitors as across-the-line capacitor in the input filter for mains applications or as series connected with
Voltage Conditions for 6 Above
EXAMPLE
C = 330 nF - 63 V used for the voltage signal shown in next drawing.
U
The ambient temperature is 35 °C
Checking conditions:
1.The peak voltage U
2.The peak-to-peak voltage 40 V is lower than 2√2 x 40 V
3.The voltage pulse slope (dU/dt) = 40 V/100 µs = 0.4 V/µs
4.The dissipated power is 16.2 mW as calculated with fourier terms
5.Not applicable
6.Not applicable
Document Number: 28109
Revision: 22-Dec-10
P-P
ALLOWED VOLTAGES
Maximum continuous RMS voltage
Maximum temperature RMS-overvoltage (< 24 h)
Maximum peak voltage (V
ringing. If the pulse voltage is lower than the rated DC voltage, the rated voltage pulse slope may be multiplied by U
divided by the applied voltage.
For all other pulses following equation must be fulfilled:
T is the pulse duration
Temperature Rise).
breakdown (short circuit) increases, it is recommended that the power to the component is limited to 100 times the values
mentioned in the table: “Heat Conductivity”
an impedance to the mains the applicant must guarantee that the following conditions are fulfilled in any case (spikes and
surge voltages from the mains included).
This is lower than 60 V/µs (see specific reference data for each version)
The temperature rise for W
This is lower than 15 °C temperature rise at 35 °C, according figure max. allowed component temperature rise
= 40 V; U
2
×
T

0


dU
------- -
dt


2
P
×
= 35 V; T
dt U
<
P
Rdc
= 35 V is lower than 63 V
P
) shall not be greater than the rated DC voltage (U
O-P
1
.
×
= 100 µs; T
) (< 2 s)


dU
------- -
dt
max.


P-P
rated
= 3.5 mm and pitch = 5 mm will be 16.2 mW/3.0 mW/°C = 5.4 °C
) shall not be greater than 2
2
= 200 µs
For technical questions, contact:
MKT Radial Potted Type
DC
DC Film Capacitors
AC
= 113 U
√
2 x U
RAC
T
P-P
1.25 x U
1.6 x U
amb
U
[e-mail]
to avoid the ionisation inception level
≤ 85 °C
RAC
RDC
MKT371, MKT372, MKT373
RDC
RAC
)
[e-mail]
Vishay BCcomponents
of Temperature” per characteristics
See “Max. AC Voltage as Function
85 °C < T
1.3 x U
U
amb
RAC
RDC
≤ 105 °C
www.vishay.com
Rdc
and
117