Group Actions
Engagement
  • Author Author: vsluiter
  • Date Created: Date Created
  • Views 490 views
  • Likes 2 likes
  • Comments 2 comments
Related
Recommended

Soldering the bq51013

vsluiter

The receiver IC is a 20-pin QFN. Although these CAN be soldered by hand (using a lot of flux) I'm very happy to be able my recently bought Atten858D+ hot air soldering station. Monte described his way of work in a previous post, and he's using the knees' bees in soldering equipment, something I'm a bit jealous of....

My hot air soldering station cost me <EUR60, but Monte was right to point out in a post that it has had its share of problems in wiring. Luckily my unit was wired correctly!

 

Video

This video shows the soldering process. I can't time my profile, but I guess this isn't JEDEC standard compliant... Aligning the part on the pads was the hardest job, after that the soldering paste 'sucks' the part in place when it melts. Have fun at watching the video!

  • in reply to DAB

    Hey DAB,

     

    Intruiging isn't it? I haven't pre-tinned the pads (the boards come with tin finished pads), and only used the solderpaste. This paste contains both a flux and tiny solder balls. The amount and the application of the tin is quite critical in not getting cold joints/shorts. The 'pros' use thin metal sheets with all the pads cut out to apply the solder paste (aka 'stencils'), I'm using the leg of a conventional through hole resistor to smear the paste across the lands. Luckily, when the tin melts, it tends to pull towards the legs, and shorting is not very common. Most of the time when using too much tin the result are 'tin balls' forming where too much flux was applied.

     

    Greetings,

    Victor

  • Almost looks like magic.

     

    Have you had any problems with shorts or cold solder joints?

     

    I assume that you pre tinned the pads before you put the part and flux on from the way the solder reacted when it reached its melt point.

     

    Very nice demo.

     

    Thanks

    DAB