In SX Microcontrollers, SX/B Compiler and SX-Key Tool, william wrote:

Mr Bean,

I have good news for you.
Just now I successfully soldered 3 SX48s using solder paste injector and a conventional oven.

Here's how I got it after a few tries.

1. Inject a thin line of solder paste on top of each row of pads.
2. Use a small cut out sponge to spread the paste thinly over the pads.  Make sure they are really thin.  Remove excess with tissue.
3. Place and align the SX48 using a magnifying glass with light.  
If the solder paste is thin enough, you should still be able to see about 50% of the pads.  This will help you align. I also use longer pads.
4. Put a small length of solder on the board near the SX48, and place the board into the pre-heated oven set at 250 degree celsius.
5.  When you notice the solder length melt into a ball, get ready.  Give it another 10 seconds, then remove the board slowly by pliers.

If the solder paste is thin enough, it usually will not bridge.  I didn't use any flux.
Of course the board should have solder mask to reduce the chances of a bridge.

Good luck.

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