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How to Install Feethrough Capacitors
General Recommendations
Handling: Excessive force or direct impact to the component may result in breakage. Lead bending or cutting, if necessary, should be done with a support for the lead to prevent mechanical stress to the component. Components with required lead modifications are available from KETE.
Lead Soldering: Use a temperature controlled soldering iron with SN60 or SN63 RMA Flux core wire. Maximum soldering temperature to be 500°F(260°C) with a dwell time of 3 seconds maximum. The use of a heat sink between the component body and the solder joint is highly recommended.
Flux Removal: Optimum flux removal can be achieved by vapor degreasing the components immediately after the soldering operation. Total immersion of the components is not recommended.
Solder Mount EMI Filter
When soldering these devices in place, attentions need to be paid to minimize the thermal shock to the capacitors. Do not plunge the filter directly into a solder pot without preheating. If pretinning the filter in a solder pot. Do not put directly into cleaning solutions without allowing it to cool down first. A controlled temperature profile not exceeding 6℉ (3℃) per second is recommended when soldering filters. Although EMI/RFI Filters can withstand temperature extremes, rapid heat-up or cool-down can crack the internal ceramic capacitor. Preheating of the filter prior to soldering should be performed wherever possible at 250/300℉(120/150℃). When soldering to terminal of the filter, a heat sink should be always be used adjacent to the body of the filter.60-40 solder is recommended for filter installation into chassis as well as soldering to terminals. When soldering to terminals using as iron, use a temperature controlled soldering iron(15-20Watts) with tip temperature of 550℉(300℃) maximum. The dwell on the solder joint should be less than 5 seconds.
If a filter style without an eyelet is being soldered into a chassis, iron processes should be avoided and the recommended solder alloy is 60-38-2. Machine/oven soldering should be at 385-415℉(195-210℃) using a dwell and cycle time fast enough to reflow the solder and ramped to maintain less than 6℉(3℃) per second of rise change.
When iron soldering to filter body, preheat component at 250-300℉(120-150℃),solder iron is recommended to be set at 490-520℉(250-280℃).The dwell on the solder joint should be less than 5 seconds. The time is dependent on the heat sinking provided by the chassis so a longer preheat maybe required.
Screw Type EMI Filter
Install revolving force–use the relative case recommend install revolving force when you install filter to the separator or pane. This is an important point, otherwise, the inside capacitor will be damage by the case distortion. The maximum install torsion should be adopt the recommend thread 50% when you install to screw hole. Just the Torque control at:6-7kgf/cm(M3),7-8kgf/cm(M4),9-10kgf/cm(M6).
Install tool–hexagon filter should need the proper tube to fix. Circular filter need following method (Never use pincer, it will damage the filter)slotted top circular filter process screw hole with the special tool.
Ground–in order to make sure filter working, filter case must be connect to panel ground enough, that it can supply the effective path for interference. Never use binder lock-on, if you have to use you can do it after the finish of installation.
Minimum thickness of panel–customer need to attention sometimes feed-thru filter has the relief groove between thread and case. it will appear some problems about thread and hole close fit and fixed-position of filter when the insert thickness is smaller than relief groove. So the panel thickness should be larger than relief groove if it is possible.
Maximum thickness of panel–make sure the nut perfect as the situation of using washer.

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