Hi Russ

could you educate me ; why & how ?

Thanks A lot          paul

> ----------
> From:         Russ[SMTP:[log in to unmask]]
> Sent:         Wednesday, 10 March 1999 4:14
> To:   [log in to unmask]
> Subject:      Re: [TN] : How to Tin Actel-CQ132
>
> Hi Bill,
> We routinely solder dip the CQ132 for Actel.  When we handle them they
> still have their non-conductive tie-bars on them.  It is a lot easier to
> trim the units first then solder dip the leads.  If you don't have too
> many you can use the RMA flux and hand dip the components just fine.  Be
> sure to keep the ceramic body out of the solder.  Since you don't have
> preheat you don't want to create a significant differential temperature
> across the component body.  You may want your operators to practice with
> some cheap plastic components first.  Depending upon whether the units
> have been burned-in you may see some problems (pin holes and dewetting)
> at the location of the electrical contact.  This can be resolved by
> using a stronger flux.  We have a flux specifially formulated for
> tinning fine pitch components if you need a free sample just give us a
> call.
>
> Because of the gold thickness it is usually recommended that you do a
> double dip (especially since you have little control of depth and time)
> and I assume your pot is static.  The trick in getting things just right
> is to lift one end out of the solder first.  In other words the solder
> should break free from pin 1 then pin 2 ... etc.   About a 3 degree
> angle should do the trick.  You will need a pretty steady hand for this
> job.  Also, you will want to exit the solder relatively quickly to keep
> the thickness above the typical minimum requirement of 200 microinches
> (if this applies to you).
>
> The solder temperature we use is 250 C.  And just for the record our
> machines are automatic and we don't solder dip any components manually.
> Our experience has taught us that processes manage to change themselves
> whenever you don't password protect them.
>
> One final word of caution.  Every once in a while a gross leak escapee
> gets into the mix.  This is a part that is filled with fluorocarbon
> liquid that will pop when it gets hot enough.  It can scare the pants
> off of your operators and can splash the solder around so be certain
> they are wearing the proper safety gear.
>
> If you need any further assistance please feel free to contact me
> directly at (408) 526-1350 x 1.
>
> Regards, Russ Winslow
>
> Six Sigma
> 1940 Concourse Drive
> San Jose, CA  95131
>
> [log in to unmask]
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Kasprzak, Bill (esd)
> US
> Sent: Tuesday, March 09, 1999 9:45 AM
> To: [log in to unmask]
> Subject: [TN] : How to Tin Actel-CQ132
>
>
> Fellow techies:
>
> We are going to be using an Actel CQ132 Ceramic Quad Flatpack (25 mil
> pitch). From a process standpoint I have ordered a die from Fancort to
> form
> the part, and we will be dispensing solder paste through a Camalot
> Poisitve
> Displacement pump (can't stencil due to component location), component
> will
> be placed then run through my Heller 1088 reflow system. All this
> forming
> and dispensing stuff is new to me but the pitch and the reflow is not.
>
> There is one part of the process that I'm taking for granted and that is
> the
> tinning of the part. The part is received with gold leads.(Doesn't come
> in
> anything but gold, and besides, the part will not form well with solder
> on
> the leads)  I'm assuming that after the part is formed, I can dip the
> feet
> of the formed part in RMA flux then tin in a 500 degree F solder pot
> like
> any other part, one side at a time. I would then clean the part in
> Flux-Off-CZ then place into my matrix tray to hold until placement time.
> I'll probably use a vacuum pencil to hold the part.
>
> Is the tinning of this part as routine as I think its going to be or do
> I
> need to worry about another new process ?  Recommendations are needed.
>
> Bill Kasprzak
> Moog Inc.
>
> (Have we hit the 2000 mark yet ? [Just havin' fun Steve, I know how it
> feels])
>
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