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Tinker

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Joined: 07/11/2007
Location: Australia
Posts: 1904

Posted: 09:38am 29 May 2019

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When I order my PCB's from China there are two expressions I'm not sure what they mean.

Could somebody tell me what "HASL" stands for?

Also, what does "tented", as in 'tented' vias, mean?

Thank you.

Klaus

plover

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Joined: 18/04/2013
Location: Australia
Posts: 302

Posted: 12:13pm 29 May 2019

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HASL

HASL or hot air solder leveling is a type of finish used on printed circuit boards (PCBs). The PCB is typically dipped into a bath of molten solder so that all ...

quoted from wiki, just google HASL
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=2ahUKEwil8cWw2sDiAhX87nMBHfvHBocQFjAA egQIAhAB&url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FHot_air_solder_leveling&usg=AOvVaw10i3gdZu8MChlr1PtiV24G

google "via tenting"

Quoting:
Via Tenting for PCB Design. Tenting a via refers to covering via with soldermask to enclose or skin over the opening

Tinker

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Joined: 07/11/2007
Location: Australia
Posts: 1904

Posted: 12:39pm 29 May 2019

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Thanks, did not think that google would know that

Klaus

Warpspeed
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Joined: 09/08/2007
Location: Australia
Posts: 4406

Posted: 10:28pm 09 Jul 2019

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Yup.
There are two ways to tin a PCB.
You can electroplate it in a chemical bath, or dip int into real solder and blow off all the excess with compressed air. This is generally preferred for mass production because its much faster.

Cheers, �Tony.

Grogster

Admin Group

Joined: 31/12/2012
Location: New Zealand
Posts: 9462

Posted: 01:57am 10 Jul 2019

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....and then you can get gold-plated PCB's, which some people swear by, but I am not convinced of the extra cost vs benefits.

Gold-plating edge-connectors is a good idea though, as it prevents corrosion.
Depends on what you want to do.

And there is also "Blind vias" and "Buried vias"
Blind ones start on one side of the board, and connect to an internal layer, but DON'T travel right through to the other side of the board, and buried vias link points on the internal layers only, and are not visible at all from either the top or bottom layers of the board. Blind and buried vias cost a lot more to get done, so use plain vias if at all possible - even on four-layer boards, as it will save money.

Smoke makes things work. When the smoke gets out, it stops!

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