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October 2005

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From:
Kevin Glidden <[log in to unmask]>
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Date:
Mon, 10 Oct 2005 14:45:05 -0400
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I agree w/ Ramon.  Aside from the vibration / reliability issues, I would be
very concerned with the manufacturability of such a bus bar.  Attaching this
to the PCB will be very difficult, as the busbar will act as a very nice
heat sink.  My recommendation would be utilize locating pins in the bus bar
w/ mating holes in the PCB.  Then utilize hardware through the PCB to attach
the bus-bar.  You can put helicoils in the bus bar, or machine thru and
utilize nuts.  Also from a machining and cost standpoint, perhaps anodized
Al vs Cu?  Anodize the external surfaces.



-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dehoyos, Ramon
Sent: Monday, October 10, 2005 2:08 PM
To: [log in to unmask]
Subject: Re: [TN] Buss Bar Attachment Method

        Hi John:
        Have you consider besides soldering it, to also hardware it to a
specific torque? That much current may cause vibration and cracking of the
joints.
        Regards,
        Ramon

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of John Bauer
Sent: Monday, October 10, 2005 1:24 PM
To: [log in to unmask]
Subject: [TN] Buss Bar Attachment Method

Greetings,

We have an application where we will be attaching a buss bar that is 6
inches in length X .50 inch wide X .125 inch thick to the surface of our
PCBA. The buss bar material is currently spec'd as full hard copper and is
tin-lead plated.

The .50 inch width side of the buss bar will be the surface soldered to the
PCBA.

My questions to you are

1) What process would be used to solder this bar to surface of the PCBA?

2) What plating options would be recommended other than tin-lead for this
buss bar?

The end use application for this will require that it handle 1000A of
current in a worst case scenario.

Thanks in advance,

John Bauer

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