MKT 1820-468/404-G Vishay, MKT 1820-468/404-G Datasheet - Page 8

• Manufacturer Part Number: MKT 1820-468/404-G
• Manufacturer: Vishay

Specifications of MKT 1820-468/404-G

• Tolerance (+ Or -): 5%
• Voltage: 400VDC/200VAC
• Temp Coeff (dielectric): PLYE
• Mounting Style: Through Hole
• Construction: Radial
• Failure Rate: Not Required
• Seated Plane Height: 16.5mm
• Product Diameter (mm): Not Requiredmm
• Product Height (mm): 16.5mm
• Product Depth (mm): 8.5mm
• Product Length (mm): 26.5mm
• Lead Spacing (nom): 22.5mm
• Lead Diameter (nom): 0.8mm
• Operating Temp Range: -55C to 125C
• Capacitance: .68uF
• Package / Case: Not Required
• Lead Free Status / RoHS Status: Compliant

MEASURING THE COMPONENT TEMPERATURE
A thermocouple must be attached to the capacitor body as in:
The temperature is measured in unloaded (T
The temperature rise is given by ΔT = T
To avoid radiation or convection, the capacitor should be tested in a wind-free box.
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.
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
Document Number: 26011
Revision: 18-Feb-10
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).
2
×
T
∫
0
⎛
⎝
dU
------- -
dt
⎞
⎠
2
×
dt U
<
Rdc
P
) shall not be greater than the rated DC voltage (U
O-P
×
) (< 2 s)
⎛
⎝
dU
------- -
dt
⎞
⎠
P-P
rated
) shall not be greater than the maximum (U
c
- T
For technical questions, contact:
amb
amb
MKT Radial Potted Type
.
) and maximum loaded condition (T
DC Film Capacitors
T
1.25 x U
1.6 x U
amb
U
≤ 85 °C
RAC
RDC
RAC
[e-mail]
Thermocouple
85 °C < T
Rdc
p-p
)
1.3 x U
0.8 x U
) to avoid the ionisation inception level
U
C
amb
RAC
).
RDC
RAC
≤ 100 °C
Vishay Roederstein
100 °C < T
0.5 x U
0.5 x U
0.6 x U
MKT 1820
amb
RDC
RAC
RAC
www.vishay.com
≤ 125 °C
Rdc
and
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