Electronics Forum: soldering problems with qfn (Page 5 of 36)

Problem with less soldering material on the pins

Electronics Forum | Thu Apr 20 11:59:34 EDT 2017 | cromaclear

Surface finish is Tin 7 microns thick

soldering lead free component with lead bearing solder

Electronics Forum | Fri Feb 11 16:58:24 EST 2005 | steve

I know this has been dealt with in the past but I couldn't dig up anything in the archives. If I'm soldering a 0402 lead free component with 63/37 solder is this a problem. Also lets take the opposite. If I'm soldering a lead bearing 0402 with lead f

Gold Flash with QFN28 problem

Electronics Forum | Thu Mar 30 08:38:58 EST 2006 | Dan

We have this panel that is Gold Flash. Am I correct in assuming this is technically a lead-free panel then? We are running a WS paste, and the QFN28 has balls of solder instead of a fillet. My Max temp is 216, and the TAL was between 52-57 secs with

ZIPATEC selective soldering select 250, help with offsets

Electronics Forum | Thu Jan 14 06:03:51 EST 2021 | manaik

Hello, We have recently bought ZipaTec select 250, we are having problems with offsets. Somehow the offset of fluxer, wave and preheat dont match one another or the program we create. The previous owners are of no help. The main question i have

Problem with less soldering material on the pins

Electronics Forum | Thu Apr 20 02:37:33 EDT 2017 | cromaclear

Parameters are all the same, the pin is only connected to the capacitor.I will check about surface finish with my logistics.

Problem with less soldering material on the pins

Electronics Forum | Thu Apr 20 02:44:39 EDT 2017 | tsvetan

The hole is too big, you should reduce the size in the next PCB revision. The middle joint is soldered at low temperature you can see how the solder didn't distributed evently and cooled on waves. The solder joint at the bottom didn't wet the capac

Tip life of soldering irons with lead-free (SAC305)

Electronics Forum | Wed May 03 11:26:57 EDT 2006 | George

Sheldon, Try using SN100C wire solder. It seems to extend the life of the tips plus solder joints look much better. We use both, clean and No-clean. We had the same problem while using SAC305... Thanks, George

Problem with less soldering material on the pins

Electronics Forum | Thu Apr 20 02:27:11 EDT 2017 | pavel_murtishev

Mile, Please tell me more about your soldering process: - Are soldering process parameters the same for all three pins? - Is unsoldered pin connected to thermal heavy copper polygon? - What is your board surface finish? HASL? - Sn/Pb or LF process?

Using parts with Tin Bismuth plating in tin lead soldering

Electronics Forum | Mon Dec 12 14:04:33 EST 2005 | craigj

Hi All was wondering is there anything I should be aware of or look out for if using parts with SnBi (Pb free) lead plating with Sn/Pb/Ag solder paste? I was always lead to believe that mixng lead and bismuth caused problems or are the bismuth levels

Problem with less soldering material on the pins

Electronics Forum | Thu Apr 20 03:50:35 EDT 2017 | cromaclear

To overcome the dewetting issues of the past, a number of techniques have been used such as alternating directions on the wetted nozzle; this helps to avoid the solder biasing to one side causing the other side to oxidize and de-wet. Another method o


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