RE: SMD soldering (off topic)

It also sounds a little hot on the device!

Chris


-----Original Message-----
From: tini-admin-6tN4nzCoH/[email protected] [mailto:[email protected]] On Behalf
Of Mark Purcell [MAP]
Sent: Tuesday, January 20, 2004 5:02 PM
To: Andrew Rogers; Jeff Sutherland; tini-6tN4nzCoH/[email protected]
Subject: Re: [TINI]SMD soldering (off topic)



<snip >
> I'm not really experienced in this area but here's what I found worked

> really well for a SSOP28 package.
>
> In contradiction to what others say I used a very large (9mm) knife 
> type soldering bit. First I tinned my homemade PCB using a soldering 
> iron and SMFL. I then soldered down one pin, I accidently bridged the 
> next with solder. A very small amount of solder was then applied to 
> the knife tip and more SMFL to the board an chip pins. I then applied 
> the knife tip to the pins and pads and slowly drew the tip across. I 
> was amazed by the sucess of this, even the bridged pins cleared. This 
> is the only SMD IC that I have ever soldered, it may be just luck!
>
> SMFL is an rework solder flux spray and is non-corrosive.
>

This can work well for things like SSOP with the largish pitch and thick
pins, but it may well end in disaster for small 0.5mm pitch TQFP
packages, the legs are very thin and the pitch is very fine. I would
suggest only attempting this after some practice!

Mark.

Mark Purcell, MAP Electronics
web: http://www.mapelectronics.co.uk/
email: map-hdgEqy5R1AG+FmPSFd0fl9Bc4/[email protected]

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