MKT 1813
Metallized Polyester Film Capacitor
MKT Axial Type
Vishay BCcomponents
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
Tamb ≤ 85 °C
URac
85 °C < Tamb ≤ 100 °C
0.8 x URac
ALLOWED VOLTAGES
Maximum continuous RMS voltage
Maximum temperature RMS-overvoltage (< 24 h)
Maximum peak voltage (VO-P) (< 2 s)
URac
1.25 x URac
1.6 x URdc
1.3 x URdc
EXAMPLE
C = 3300 nF - 100 V used for the voltage signal shown in next figure.
UP-P = 80 V; UP = 70 V; T1 = 0.5 ms; T2 = 1 ms
The ambient temperature is 35 °C
Checking conditions:
1. The peak voltage UP = 70 V is lower than 100 Vdc
2. The peak-to-peak voltage 80 V is lower than 2√2 x 63 Vac = 178 UP-P
3. The voltage pulse slope (dU/dt) = 80 V/500 µs = 0.16 V/µs
This is lower than 8 V/µs (see specific reference data for each version)
4. The dissipated power is 60 mW as calculated with fourier terms
The temperature rise for Wmax. = 11.5 mm and pitch = 26.5 mm will be 60 mW/13 mW/°C = 4.6 °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
Time
T1
T2
www.vishay.com
9
For technical questions, contact: dc-film@vishay.com
Document Number: 26013
Revision: 06-Oct-08