Recommended Soldering Iron Temperature for De-soldering Smart Plug Power Pins?

I want to desolder a think power connector like this:



The soldering point is for connecting the PCB to the plug pins.

I do not know what type of solder has been used by manufacturer.

What should be the temperature of the soldering iron Tip to be able to melt this solder easily?

I have tried 300-310C but still very difficult to melt (need to hold for long and difficult to get the solder on to a wick.

Need some advice from veterans here.

The main trick here is to add some Pb solder first (the one that has a low melting temperature) and let it mix with the Pb-free solder used by manufacturer. Of course, you also need to add flux first, but once the solder mixes, the whole mix will be easier to remove with wick and will have lower melting point.

There is also a special kind of solder dedicated to that kind of things, called 'ChipQuik', but I have never used it and I am always getting job done just with a Pb one.

The temperature required depends on many things, including the thermal capacitance of the copper pour here, which I must admit looks like it's high, the copper area looks large and has via, it must be for high currents:

you can slightly increase temperature depending on how hard the soldering goes.

PS: I am unable to determine from the photos if the connector you are desoldering is a single part one (two pins has to be desoldered together) , or if you can detach each one separately, but once solder is removed, it should be easy to pull out.

p.kaczmarek2 wrote:

PS: I am unable to determine from the photos if the connector you are desoldering is a single part one (two pins has to be desoldered together) , or if you can detach each one separately, but once solder is removed, it should be easy to pull out.

It is little bit trickier getting it out also. Some gentle lifting/pulling is needed as the entire PCB has to lift up.