Electronic – Soldering pins underneath a connector

connectorreflowsoldering

I wish to solder this type of HDMI connector (Datasheet) to matching pads on a PCB:

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So half the pins are protruding out into the clear, and that row is easy to solder.

But just behind that row, as you can see, the 2nd parallel row with the other half of the pins are located inaccessibly underneath the body of the connector.

How can I do this soldering job?

  • Using a soldering iron, I wouldn't be able to reach there obviously.

  • Would this require using a hot air gun to apply heat from the underside of the board?

  • Or if I have to use an oven, can I apply solder paste and place the connector as-is on top of the pads? (The connector doesn't have any special thermal-protective tape.)

Best Answer

By far the easiest thing to do is simply using a hot plate and a hot air gun. Apply solder paste to the pads (this doesn't need to be very precise, just make sure you don't apply too much). Heat up the board to ~100-150 degrees C on the hot plate, hold the component with thin tweezers (don't use thick pliers, they heatsink too much) and gently use the hot air gun to further heat the part. It will solder very quickly and easily.

If there are heat sensitive (plastic/plastic-wrapped) parts nearby, put some aluminum foil over top of them so they don't get scalded by the hot air gun.

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