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	Tue, 07 Jul 2020 00:55:47 -0700 (PDT)
Date:	Tue, 7 Jul 2020 09:55:45 +0200
From:	"N (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To:	geda-user AT delorie DOT com
Subject:	Re: [geda-user] Soldering high current thru hole components
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> On Mon, Jul 6, 2020 at 2:32 PM N (nicklas DOT karlsson17 AT gmail DOT com) [via
> geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:
> 
> > Anybody here have experience with soldering of high current components like current sensors and connectors on thick copper boards?
> 
> If there is any mechanical mounting hardware make sure to do that
> BEFORE soldering.

Put transistors with backside there heat is coming out outwards, then board is pressed against heatsink during assembly. Middle pin stick out so it is rather flexible, this is to get large creepage distance but pins on edges are rather stiff so maybe some extra bend here to make them flexible would be good.

> If solder then do the hardware, that will put stress on the solder joints.
> With time vibrations and temperature cycles will cause the joint to break.
> Possibly in ways that are hard to see with the naked eye and may be
> intermittent.

For connectors pins are very short so hopefully no problem but temperature cycling may occur. Happen to know if this is a problem for electrolytic capacitors?

Use ordinary lead free solder SN99CU1 or similar but may use other if better. Use solder iron + heat gun with small diameter tip as it is easier to solder then surronding is heated but three arms would be good. It is 2oz copper without thermal relief. Solder irons with small tip usually have low power while these with hight power have large tip. Maybe gas fired solder iron have high power in small tip.

Transistors and current sensor work rather well. Connectors and electrolyc capacitors is a little bit more problematic, I guess adding thermal relief on electrolytic capacitors should be no problem as ripple current is low anyway but prefer not on connectors, or anybody know how much resistance thermal relief is adding.


Regards Nicklas Karlsson

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