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September 2000

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Subject:
Re: Axial Cap's lead resting on the board...
From:
Roberts Jon <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 13 Sep 2000 11:53:05 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (193 lines) 
I do not think the solder mask is to be considered an insulative material.
In 610C under section 9 Coatings there is a note that the formulation has to
be possible reviewed as to its insulative properties.  Be careful not to
adhesive the leads to negate stress relief.   My 2 cents worth.  Jon

 -----Original Message-----
From:   Phil Nutting [mailto:[log in to unmask]]
Sent:   Wednesday, September 13, 2000 11:16 AM
To:     [log in to unmask]
Subject:        Re: [TN] Axial Cap's lead resting on the board...

Ken,

In my way of thinking, yes the leads can run directly on the surface of the
board with one qualifier.  The leads have to be insulated from copper traces
(if any).  This is accomplished by either the solder mask or, to be extra
careful, use Teflon tubing over the lead that must be directly on the board.
This also assumes that the leads are strong enough to support the weight of
the cap body.  If not, some sort of holding mechanism needs to be used.
This is where we use RTV.

Sorry for confusion the first time around.

Regards,

Phil

-----Original Message-----
From: Ken Patel [mailto:[log in to unmask]]
Sent: Wednesday, September 13, 2000 12:07 PM
To: [log in to unmask]
Subject: Re: [TN] Axial Cap's lead resting on the board...


Phil,
My original question still remains unanswered. Will there be any problem if
the leads (not component body) are resting on the board surface?

As we do not want body of the resistor of 1/2W and above on the board, I
just want to make sure that I am OK with the LEADS of the caps resting on
the board.

re,
ken patel

-----Original Message-----
From: Phil Nutting [mailto:[log in to unmask]]
Sent: Wednesday, September 13, 2000 5:56 AM
To: [log in to unmask]
Subject: Re: [TN] Axial Cap's lead resting on the board...


Guy,

Frequently we have large caps mounted on High Voltage Multiplier boards or
Power Converter boards and they always seem to have flimsy leads.  One of
the best solutions has been to use RTV as a method of bonding and
stabilizing the caps.  An alternate method is using a Ty-Wrap around the cap
through the board.

Regards,

Phil Nutting
Manufacturing Engineer
Kaiser Systems, Inc.


-----Original Message-----
From: Guy Ramsey [mailto:[log in to unmask]]
Sent: Wednesday, September 13, 2000 7:17 AM
To: [log in to unmask]
Subject: Re: [TN] Axial Cap's lead resting on the board...


Not a good idea. These type components are designed to have the component
body resting on the board. Lead connections to the component are quite
fragile.

 Guy Ramsey
American Competitiveness Institute
Senior Lab Technician / Instructor
610 362-1200 ext 107


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Ken Patel
Sent: Tuesday, September 12, 2000 9:21 PM
To: [log in to unmask]
Subject: [TN] Axial Cap's lead resting on the board...


Guys,
Do you see any problem in having axial PTH capacitor's leads lying on the
board surface? I have a board with cut out in it
and has two holes across the cut out. Bec' of the height restriction on the
board, we want this axial cap's leads rest on the board leaving body hanging
in the air across the thickness.

I hope you are getting the picture here. Please let me know if you see any
problem or I should be aware off.

re,
ken patel

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