Jowan-
I'll bet you could understand this much better if you reflowed one of these parts on a rework system while watching it under a microscope. The picture you posted looks like there was even more solder at the shoulder which backed off after making contact with the adjacent lead.
Wayne
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Reuven Rokah
Sent: Monday, June 28, 2010 9:53 AM
To: [log in to unmask]
Subject: Re: [TN] QFP short at top of the leads
Hi Jowan,
Check if the leads plating is Ag matte finish.
If yes, sometime such finish have solder wicking capabilities toward it's lead's shoulders.
Reuven ROKAH
Think green before printing this mail... Thanks
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Iven, Jowan
Sent: Monday, June 28, 2010 3:53 PM
To: [log in to unmask]
Subject: Re: [TN] QFP short at top of the leads
Jerry,
The component was not dipped before placement
In the picture you can see the original component placed on top of the
soldered one. It's not dipped.
Jowan
-----Original Message-----
From: Jerry Dengler [mailto:[log in to unmask]]
Sent: maandag 28 juni 2010 13:40
To: TechNet E-Mail Forum; Iven, Jowan
Subject: RE: [TN] QFP short at top of the leads
Jowan,
Was this part dipped in solder before placing? It looks like solder has
coated the whole lead right up to the body.
Jerry
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Iven, Jowan
Sent: Monday, June 28, 2010 5:08 AM
To: [log in to unmask]
Subject: [TN] QFP short at top of the leads
Has anyone ever seen a QFP where shorts occur after soldering at the top
of the leads?
And the leads look pretty dull after soldering. Any ideas?
A picture is available at
http://ipc-technet.groupsite.com/uploads/galleries/x/000/020/5ba/technet
01.jpg
Jowan Iven
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