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Feedthrough core capacitor

March 29, 2019

Feedthrough capacitance, feedthrough filter installation considerations
The core of the feedthrough filter is a disk-shaped multilayer or tubular Ceramic Capacitor. Like other ceramic items, it is subject to sudden temperature changes.
Mechanical shock and excessive voltage damage. When installing the feedthrough filter to the board surface, the welding filter's guide pin and shaping must be carefully controlled to minimize stress.
Mounting thread-type through filter
Mounting Rotational Force—Use the mounting rotation force recommended for the housing when mounting the filter to the bulkhead or panel. This is an important point.
Otherwise, the inside capacitor may be damaged due to the deformation of the housing. When installing in a threaded hole, the maximum installation torque should be 50% of the recommended nut.
The installation tool—hexagonal filter—applies a suitable casing installation. The following method is used for round shape (cannot be installed with pliers tool so as not to damage the filter).
The slotted circular filter at the top is screwed into the threaded hole with a simple special tool.
Grounding—To ensure proper operation of the filter, the enclosure of the filter must be sufficiently connected to the ground of the panel to provide an effective path for interference. Adhesive locking is not recommended and should be used after the filter is installed if it is to be used.
Minimum plate thickness - Users should note that sometimes the feedthrough filter has an undercut between the thread and the mounting edge of the housing. When the thickness of the feed plate is smaller than the length of the undercut, the tight fit of the threaded hole and the positioning of the filter can cause problems. therefore,
Where possible, the thickness of the panel should be greater than the length of this undercut.
Maximum plate thickness - This indicator is used as a guarantee that the nut can be completely toothed, including the use of gaskets.
Install direct welding through filter
The welding process should be controlled so that the filter does not suffer from sudden thermal shocks that can cause internal ceramic capacitors to crack.
The temperature is maintained at 2 °C/sec during warm-up. In fact, depending on the different substrates and components, there are examples of successful soldering in the range of 1.5 ~ 4 °C / s.
It is useful to use a soaking zone before welding. This makes the substrate temperature uniform without deformation. Upon cooling, any substrate deformation recovery can cause damage to the filter.
Welding materials can be SN60, SN62 or similar types.
The welding time should be minimized and the temperature should be controlled to no more than 250 °C (suitable for welded-through series).
Cooling to room temperature should be natural cooling. Allow the temperature difference of the welding point to relax one by one to avoid the air cooling. Forced airflow cooling will bring temperature damage, and cleaning with cold liquid immediately after welding will destroy the ceramic capacitor.
Terminal soldering
Whether it is screw type or direct welding type, the following points should be noted when welding the guide pin:
The temperature of the soldering iron end should not exceed 300 °C, and the soldering material time should be 3 to 5 seconds in the longest, so as to minimize the risk of thermal shock destroying the capacitor.
Welding materials can be SN60, SN62 or similar types.
Use a heat sink as much as possible between the welding point and the housing, especially if the welding time is long.
Curved trim of the guide pin
The bend of the filter guide pin should not be carried out within 4mm of the epoxy seal. The guide pin should be supported when trimming the guide pin.

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