Electronics Forum: quad and qfp (Page 1 of 17)

qfp and soic joint Problem

Electronics Forum | Tue Apr 11 10:30:46 EDT 2000 | Jeremy Smith

I am having a problem with some joints on a 100 pin pqfp and few different soics on one particular board. When viewed a 8x with a "Mantis" inspection scope the joints look as though they wetted to the ic leg but when probed the leg will pop loose.

Re: qfp and soic joint Problem

Electronics Forum | Mon Apr 17 19:30:27 EDT 2000 | Boca

All of the above is good stuff. To add, I have seen this several times if the assembly is wavesoldered. Heat from the wave can partially reflow the top side SM solder joints and weaken them. To test, check joint strength before wave and then after

Re: qfp and soic joint Problem

Electronics Forum | Tue Apr 11 14:59:05 EDT 2000 | Glenn Robertson

Jeremy - What's the process flow on these modules? Are they wave soldered? What is the board finish (ENG, HASL, etc.)? Glenn Robertson

Re: qfp and soic joint Problem

Electronics Forum | Tue Apr 11 16:42:56 EDT 2000 | Chad Notebaert

I�m thinking �Poor intermatallic� It could be a few things. Lets start at the beginning. -Is your paste a 63/37 mixture? -Have you monitored you screen printing, Verify Solder deposition, Are you getting enough paste? -You say the solder looks like i

Re: qfp and soic joint Problem

Electronics Forum | Tue Apr 11 20:26:16 EDT 2000 | Dave F

Jeremy: Parts assembler make leads of either Alloy 42 (Invar, whatever) or copper. The solderability of these leads are protected with eutectic or non-eutectic tin/lead solder, palladium or some palladium alloy, or gold. Cuppla things to consider:

Advice on used pick and place machine

Electronics Forum | Mon Oct 09 07:50:22 EDT 2006 | quad

We currently run two Quad IVC's (we are very pleased with them) and two Versatronics for simple small volume batch work. We now need an additional machine capable of placing components at least three times as quickly as a IVC. We don't do anything ve

New Pick and Place Operation

Electronics Forum | Wed Jun 02 16:33:08 EDT 2004 | davem

Fuji is the best, but there are other alternatives besides Quad. If you really want to look at Fuji, take a peek at their XP142E series. With "Vision processing on the fly" and a "Mini Turret Head" with 12 placement nozzles it should fit your needs n

QFP on going on square (now and again)

Electronics Forum | Tue Apr 02 13:43:54 EDT 2013 | ericrr

On one of the products uses a QFP (Quad Flat Package)which is not going on straight, maybe 20 pins per 4 sides. sometimes I have to tweak the alignment before the board goes in the oven, this practice can be a bit of a worry if you over tweak it - pa

Mydata Pick and place

Electronics Forum | Thu Aug 30 15:31:17 EDT 2001 | Eric123

I recommend the Mydata if you want to reduce your stress. I am using Siemens at a new company today. It reminds me of my Quad days, once you get it running it works well but the getting there drives you nuts. Siemens is not up there in the user frein

BGA and PCB finishing

Electronics Forum | Tue Mar 14 05:02:35 EST 2000 | emmanuel

I am to implement PBGA, and i am looking for PCB surface finish informations. A lot of technical reports are specifing NiAu finishing because of flatness property. Because of leads shape, I though that BGA doesn't need flat pads like QFP. Is it false

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