EEVblog #782 – The Dangers Of Reflow Soldering

Dave shows why reflow soldering in a DIY oven can be tricky business for connectors and other parts, particularly ones designed only for through-hole soldering.
Reflowing an existing board (and even new boards) can be fraught with danger.

Phoenix Contact Connectors for SMT Production Through Hole Reflow
Lead Free Solder Paste Datasheet
Hirose connector datasheet
Forum HERE

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8 comments

  1. Just cut off the melted plastic, good enough for Australia..

    • It’s hard as rock. Will have to be softended with heat first, and then the pins will fall out. And hard to solder back in because they are all at an angle embedded in the plastic!

  2. This song is dedicated to all the forever young (khm) players: https://youtu.be/t1TcDHrkQYg

  3. Nearly wet myself laughing – Google (youtube) just put a batteriser ad on Dave’s latest video for my advertising pleasure! Love it.

  4. Dave, back in the late 90s a product we were manufacturing used some surface mount multi-turn pots and we changed from one well known brand to another one well known brand because it was 50% of the cost. We started to have issues with some of these pots, the wiper value didn’t change when the adjustment screw was turned, on investigation the maximum reflow temperature was 15°C lower than the original pot. Unlike your connectors these pots had melted internally but had no visible external damage. This trap for young players moment taught me to always check why one part is much cheaper than another.

  5. Good to see the *master* is not afraid at all to expose his own f*ck*ps! Way to go!

    But what’s next. Rethrow it in the dumpster or get alternative connectors? This is evolving in a real soap-opera… (maybe this way I can get my wife intrested in the EEVBlog… haha)

  6. If I am not mistaken, this is a real thing called intrusive reflow – TH parts with paste and reflowed just like SMD parts. But you have to check the data sheets to make sure your TH parts can stand up to the heat. Also, intrusive reflow isn’t common because it’s really hard to get PnP machines to place TH parts reliably, and having people do it just screws up what is otherwise a fully automated flow.

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