MKT1817368016G 查看數據表（PDF） - Vishay Semiconductors

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MKT1817368016G

Metallized Polyester Film Capacitors MKT Radial Potted Types

Vishay Semiconductors 

Not for New Designs - Alternative Device: MKT370

www.vishay.com

MKT1817

Vishay Roederstein

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: dc-film@vishay.com

To select the capacitor for a certain application, the following conditions must be checked:

1. The peak voltage (UP) shall not be greater than the rated DC voltage (URDC)

2. The peak-to-peak voltage (UP-P) shall not be greater than 22 x URAC to avoid the ionization inception level

3. The voltage peak slope (dU/dt) shall not exceed the rated voltage pulse slope in an RC-circuit at rated voltage and without

ringing. If the pulse voltage is lower than the rated DC voltage, the rated voltage pulse slope may be multiplied by URDC and

divided by the applied voltage.

For all other pulses following equation must be fulfilled:

T

 2 x





d--d--U--t-

2

x

dt



URDC

x





d--d--U--t-

r

ated

0

T is the pulse duration.

4. The maximum component surface temperature rise must be lower than the limits (see graph “Max. allowed component

temperature rise”).

5. Since in circuits used at voltages over 280 V peak-to-peak the risk for an intrinsically active flammability after a capacitor

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”

6. When using these capacitors as across-the-line capacitor in the input filter for mains applications or as series connected

with 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).

VOLTAGE CONDITIONS FOR 6 ABOVE

ALLOWED VOLTAGES

Maximum continuous RMS voltage

Maximum temperature RMS-overvoltage (< 24 h)

Maximum peak voltage (VO-P) (< 2 s)

Tamb  85 °C

URAC

1.25 x URAC

1.6 x URDC

85 °C < Tamb  100 °C FOR 63 V

85 °C < Tamb  100 °C FOR > 63 V

See “Max. AC voltage as function

of temperature” per characteristics

URAC

1.3 x URDC

Example

C = 330 nF - 63 V used for the voltage signal shown in next drawing.

UP-P = 40 V; UP = 35 V; T1 = 100 μs; T2 = 200 μs

The ambient temperature is 35 °C

Checking conditions:

1. The peak voltage UP = 35 V is lower than 63 VDC

2. The peak-to-peak voltage 40 V is lower than 22 x 40 VAC = 113 UP-P

3. The voltage pulse slope (dU/dt) = 40 V/100 μs = 0.4 V/μs

This is lower than 60 V/μs (see specific reference data for each version)

4. The dissipated power is 16.2 mW as calculated with fourier terms

The temperature rise for wmax. = 3.5 mm and pitch = 5 mm will be 16.2 mW/3.0 mW/°C = 5.4 °C

This is lower than 15 °C temperature rise at 35 °C, according figure “Max. allowed component temperature rise”

5. Not applicable

6. Not applicable

Voltage Signal

Voltage

UP

UP-P

T1

T2

Time

Revision: 11-Jan-18

9

Document Number: 26032

For technical questions, contact: dc-film@vishay.com

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000

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