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Old 21st March 2013, 03:56 AM   #1
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Default How do you solder this 24pin SMD IC+

I have limited experience with SMD and this is this is the first time I've encountered this. I ordered replacements and then removed the old ones.
There is a large pad on the bottom that is soldered to a large ground land on the board.

How do I solder this large ground under the IC?

Click the image to open in full size.
Click the image to open in full size.

The back side of the board has a land on the ground mirroring the front side (second image) with the same pinholes in it. Am I supposed to apply heat here to the backside until I see solder flow out of the holes?

I have not seen mention of this in any tutorials.
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Old 21st March 2013, 04:11 AM   #2
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If you can apply your iron to the bottom of the board and get the solder to melt between the board an IC, that will work. That might be easier said than done though. You don't want to damage the board. Solder paste and heating in a toaster oven is the high-tech DIY procedure.
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Old 21st March 2013, 04:12 AM   #3
Bikeman is offline Bikeman  Australia
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Here you go:
EEVblog #434 - SMD Thermal Pad & Drag Soldering Tutorial | EEVblog - The Electronics Engineering Video Blog

He's a bit long winded, but he really knows his stuff.

Hope that helps

Mark
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Old 21st March 2013, 05:37 AM   #4
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For the ground pad, in the past I have applied solder paste to the ground pad and leads. Then soldered the leads down to tie the chip in place, and then used a hot air gun - Actually a gas iron with hot air tip - and heated from the back until the solder flows in the vias.
You need to be gentle in heating things, and it will take a while. But this works.

Better still is to use a reflow oven. Now I have my "converted toaster oven" I use this to solder all ic's that have a ground pad.

To be honest though, if this is rework and there are other temperature sensitive parts such as plastic etc, I would consider the first approach.
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