Electronics Forum: soic (Page 1 of 37)

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 | 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 | 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 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:

SOIC solder thieves vs enlarged trailing pads

Electronics Forum | Wed Oct 07 17:36:48 EDT 1998 | Ted Nicholas

Hello! Does any one know of a disadvantage of using the Phillips recommended wave solder SOIC footprint where the last pad on each side of the SOIC is enlarged, instead of placing an extra pair of pads behind the SOIC. Both footprint patterns seem e


Electronics Forum | Tue Oct 26 03:12:36 EDT 2004 | Joseph

Dear all, Recently our production encountered high SOIC failure during testing after reflow soldering. All solder fillets (side/heel) are acceptable as per IPC standard.The reject samples (SOIC)being sent to IC manufacturer to verify the failure. Fin

TSSOP/SOIC conversion socket

Electronics Forum | vargas_s |

Tue Feb 13 14:57:59 EST 2001

Wave Soldering 14 and 16 Pin SOICs

Electronics Forum | Tue Mar 09 18:21:37 EST 1999 | Stan Levitsky

We will wave solder a board with SOIC14 and SOIC16 parts on the bottom. It has been difficult to find any specific wave solder process recommendations from manufacturers of the SOICs. The pad geometry utilizes theiving pads on both sides to reduce br

Help... Need new or used SOIC-16 metal tubes

Electronics Forum | Mon May 04 10:50:11 EDT 1998 | Eric Jenkins

Looking to buy used or new tubes, that will fit an SOIC-16 Need these tubes ASAP. We need to bake these parts and drypack. Please email or call if you can help. Eric Jenkins 801 956-0897

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