Exposed pads
2016-08-28 by iz5fcy@...
Hi to all,
as we possible to weld the exposed pads IC, not having an oven?
Thanks in advance,
IZ5FCY Roberto
as we possible to weld the exposed pads IC, not having an oven?
Thanks in advance,
IZ5FCY Roberto
Thread
Exposed pads
Re: Exposed pads
2016-08-28 by alienrelics@...
I think you mean "solder", not "weld".
---In Homebrew_PCBs@yahoogroups.com, <iz5fcy@...> wrote :
You mean the metal square on the bottom of some surface mount ICs. Yes, that can be difficult without a soldering oven.
Are you making your own PCBs? If not, you should have a lot of solder vias (plated through holes) under the exposed pad. I find I can solder these with a temperature controlled iron and a lot of liquid flux. If you only add solder to one hole, you can see when the solder flows and coats by looking in the other holes.
Of course, solder this after soldering the leads down.
Steve Greenfield AE7HD
---In Homebrew_PCBs@yahoogroups.com, <iz5fcy@...> wrote :
Hi to all,
as we possible to weld the exposed pads IC, not having an oven?
Thanks in advance,
IZ5FCY Roberto
as we possible to weld the exposed pads IC, not having an oven?
Thanks in advance,
IZ5FCY Roberto
Re: [Homebrew_PCBs] Re: Exposed pads
2016-08-28 by Dennis Shelgren
Heat guns can work if you are very careful. Ignore Youtube, use a test piece and measure the correct height away for the temperature you need and watch how long you heat if for.
On Aug 28, 2016 8:41 AM, "alienrelics@... [Homebrew_PCBs]" <Homebrew_PCBs@yahoogroups.com> wrote:I think you mean "solder", not "weld".
You mean the metal square on the bottom of some surface mount ICs. Yes, that can be difficult without a soldering oven.Are you making your own PCBs? If not, you should have a lot of solder vias (plated through holes) under the exposed pad. I find I can solder these with a temperature controlled iron and a lot of liquid flux. If you only add solder to one hole, you can see when the solder flows and coats by looking in the other holes.Of course, solder this after soldering the leads down.Steve Greenfield AE7HD
---In Homebrew_PCBs@yahoogroups.com, <iz5fcy@...> wrote :Hi to all,
as we possible to weld the exposed pads IC, not having an oven?
Thanks in advance,
IZ5FCY Roberto
Re: Exposed pads
2016-08-31 by anickol@...
Yes, it is possible. You can use a heat gun. There is another method, that requires only soldering iron,
but I never tried it. They say it works with SO8 packages.
Use a thin material for PCB. 1 mm is the maximum. Drill a hole in the center of the thermal pad. Put some solder on the PCB pad AND on the IC pad. Solder pins as usual. Use a thin tip with flat end for your soldering iron. Inject some solder into the hole and heat it there. The solder will be sucked into the gap between the IC and the PCB due to surface tension. This method is not as good as using an oven, but it is simple.
but I never tried it. They say it works with SO8 packages.
Use a thin material for PCB. 1 mm is the maximum. Drill a hole in the center of the thermal pad. Put some solder on the PCB pad AND on the IC pad. Solder pins as usual. Use a thin tip with flat end for your soldering iron. Inject some solder into the hole and heat it there. The solder will be sucked into the gap between the IC and the PCB due to surface tension. This method is not as good as using an oven, but it is simple.
RE: [Homebrew_PCBs] Re: Exposed pads
2016-09-03 by keith printy
When I worked at an electronics plant the surface mount boards were soldered by passing them through a conveyer oven. It would melt the paste and bond the parts. I do not know what temperature was used or for how long it was in there.
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
Sent: Wednesday, August 31, 2016 8:39 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: [Homebrew_PCBs] Re: Exposed pads
Yes, it is possible. You can use a heat gun. There is another method, that requires only soldering iron,
but I never tried it. They say it works with SO8 packages.
Use a thin material for PCB. 1 mm is the maximum. Drill a hole in the center of the thermal pad. Put some solder on the PCB pad AND on the IC pad. Solder pins as usual. Use a thin tip with flat end for your soldering iron. Inject some solder into the hole and heat it there. The solder will be sucked into the gap between the IC and the PCB due to surface tension. This method is not as good as using an oven, but it is simple.
Re: [Homebrew_PCBs] Re: Exposed pads
2016-09-03 by Harvey White
On Fri, 2 Sep 2016 23:45:52 -0400, you wrote:
surface mount chips. That might give you an idea of what was
involved.
Harvey
>When I worked at an electronics plant the surface mount boards were soldered by passing them through a conveyer oven. It would melt the paste and bond the parts. I do not know what temperature was used or for how long it was in there.NXP electronics gives temperature curves (and durations) for their
surface mount chips. That might give you an idea of what was
involved.
Harvey
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>From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
>Sent: Wednesday, August 31, 2016 8:39 AM
>To: Homebrew_PCBs@yahoogroups.com
>Subject: [Homebrew_PCBs] Re: Exposed pads
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>Yes, it is possible. You can use a heat gun. There is another method, that requires only soldering iron,
>but I never tried it. They say it works with SO8 packages.
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>Use a thin material for PCB. 1 mm is the maximum. Drill a hole in the center of the thermal pad. Put some solder on the PCB pad AND on the IC pad. Solder pins as usual. Use a thin tip with flat end for your soldering iron. Inject some solder into the hole and heat it there. The solder will be sucked into the gap between the IC and the PCB due to surface tension. This method is not as good as using an oven, but it is simple.
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