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Self-Inductance Depends on
Construction Principle
Depending on
the construction, an alternating current in the capacitor
winding creates a more or less distinctive magnetic field
which can be measured as inductance.
Old Type with High Self-Inductance |
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The tape length
of the
winding element determines
the value of the self-inductance |
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Modern WIMA Type
Modern plastic film
capacitors are contacted over the whole end surface of
the winding element. In this way the self-inductance of
the winding element is short-circuited.
The self-inductance is
reduced to the PCM (0.8 nH/mm) and the remaining length
of the terminating wires (in case of SMD capacitors the
distance between the soldering plates). Average value for
practical applications: inductance related to length =
0.8 nH/mm
Example: length of the terminating wires = 2 x 3 mm + PCM |
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WIMA MKS 02 / PCM 2.5 mm
Self-inductance L < 8 nH
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WIMA SMD /Size code 1812
Self-inductance L < 6 nH
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| Increasing
winding lengths in relation to the capacitance result in
a large bonding area and guarantee low ESR values.
Thus plastic film capacitors stand out
because of their HF properties which are the same as or
better than those of ceramic capacitors of comparable
size. |
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