Electronics Forum: plating (Page 136 of 252)

Re: solderballs after wavesoldering

Electronics Forum | Tue Aug 22 14:52:55 EDT 2000 | John Thorup

Jax - absolutely right - the archives are a valuable tool and deserve to be used more than they seem to be. Caumel - Are your blobs on the solder side or the component side? Are your vias tented on the component side? What size are your vias? Is th

Re: CBGA CTE Mismatch

Electronics Forum | Mon Aug 21 20:20:18 EDT 2000 | Dave F

Hi CJ: I guarantee you that the portions of you BGA that will physically move the most as a result of changing temperature are the corners. For this very reason, many BGA have BT substrates that have a tg of 210�C. I would demonstrate the potentia

Re: Solder woes

Electronics Forum | Thu Aug 10 13:30:54 EDT 2000 | Bob Willis

Solder skips on SOT23 parts is the most common issue when soldering surface mount designs. The two most common causes are the wave height too low or there is too much gassing of the flux as it contacts and seperates the wave. Stck some parts on your

Capacitor Supplier

Electronics Forum | Fri Aug 04 11:04:27 EDT 2000 | John

We manufacture a mixed technology board, that uses a through hole "mini cap" with a 2.5 mm lead span. We have had several failures caused by solder wicking up through the plated through hole pcb and touching the can. This shorts out the capacitor.

Re: Wave solder of TQFPs

Electronics Forum | Thu Jul 20 10:03:30 EDT 2000 | Bob Willis

All the points raised so far are correct. Only use QFPs if rearly pushed as the yield on your process will suffer. I have wave soldered parts down to 0.020" in nitrogen with OK results but the pads and drainage pads need to be worked on. Another r

Re: HASL Plating Thickness

Electronics Forum | Thu Jun 29 10:38:04 EDT 2000 | John Thorup

Hello Christopher I don't know if there is any kind of official standard but I can tell you that the HADCO DFM manual specifies a nominal thickness of 50-1500u" with an option for 100-1000u" and the Merix DFM manual specifies 30-200u" Our boards (fro

PCB dicing blades

Electronics Forum | Thu Jun 22 11:36:59 EDT 2000 | Andreas Albrecht

Dear Folks, could anyone give me an advice who supplies dicing blades (2 or 4") for cutting blended, through hole plated PCBs (1-3 mm thickness). Who has made good experiences (tool life, duration) with which blades? Are there any good application i

Re: Home plate or bow tie?

Electronics Forum | Sat May 27 12:50:21 EDT 2000 | Micah Newcomb

Steve, I use homebase apertures as a standard for all chip parts and have no complaints, no solder beading, no issues. I have had to replace almost all stencils ordered previous to my arrival as they all caused defects (7-9mil thickness and 1:1

Re: Home plate or bow tie?

Electronics Forum | Sun May 28 08:21:52 EDT 2000 | Sal

Can't agree more than moving over to Homebase apertures, But ensure that the cut back angle is correct,to acute of and angle will leave you with an inadequate contact area fot the terminations on the chip components and you will start seeing insuffic

Re: DEK 265 opinions needed please

Electronics Forum | Fri May 26 13:16:53 EDT 2000 | Todd

I have worked with MPM and GSP (fuji) and the DEK. I have had the least problems with the DEK. Kept having software issues with the MPM although I have heard some having good experiences. We used the GSP for the through hole but needed new vaccum


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