Hi Adrian-
That connection between a package pin and a pcb is always scary. I like this
better than just soldering the pins to surface mount pads, but I still find it
a little scary since there's no strain relief in the system. I agree with
Steve that this is something IPC doesn't address, although I'm sure there's a
blanket statement in there somewhere about using engineering and tests to
design and qualify the mechanics of the situation. Those are probably
glass-to-metal seals in there too, and those are pretty notoriously sensitive
to being soldered this close, let alone any forces due to temperature changes
or vibration.
Wayne
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Thursday, August 27, 2015 10:16 AM
To: [log in to unmask]
Subject: Re: [TN] Assembly Method - IPC Class 2 or 3?
Hi Adrian,
I have your picture posted, it is here:
http://stevezeva.homestead.com/PCB_Slot.jpg
That certainly is unusual, I don't think you'll find anything in IPC that
addresses that sort of interconnection. But the important thing is whether or
not that works for YOU. Personally, I don't see why it shouldn't provided that
there is a continuous fillet that wets completely to the pin and walls of the
slot. It looks like there is a void in the fillet that you have circled in
red, I don't think you want to see that.
One other thing that you might consider, although it's had to tell from the
picture, it looks like those pins might be gold plated, I think I would
consider removing the gold so that there is no possibility of embrittlement
issues.
Interesting connection scheme though...
Steve
On Thu, Aug 27, 2015 at 7:27 AM, Adrian Dimulescu <[log in to unmask]>
wrote:
> We are looking at different methods of attaching a pin to a PCB
> assembly but are not sure if it's Class 2 or 3 acceptable. Per
> attached picture, we want to solder a pin into a plated edge-wrapped
> slot located at the edge of the board.
>
> Does anybody know if this is acceptable per IPC requirements? I
> searched
> IPC-610 but couldn't find anything similar to this.
>
> Adrian Dimulescu
> MtronPTI
> [log in to unmask]
> (407) 298-2000 x2263
>
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