Electronics Forum: ddf and 2

Intermetallics and reflow profile

Electronics Forum | Tue May 02 15:29:14 EDT 2000 | M. F. Roe

I am looking for public papers or articles on intermetallic formation as a function of reflow profile. Most solder paste vendors specify peak temperature and time above liquidus, but I am particularly interested in what happens to intermetallic grow

CCGA and overprinting?

Electronics Forum | Mon Oct 15 12:42:36 EDT 2001 | davef

I hate getting "roped" into math stuff, but here I go again ... Area of aperture = volume of paste / stencil thickness = {[5000 mil^3] / 5 mil} = 1000 mil^2 Side of the square aperture = Sqrt of the area = [1000 mil^2]^1/2 = 32 mil Diameter of ape

SMT Processing and gasketing

Electronics Forum | Tue Nov 11 17:35:08 EST 2008 | davef

SM-840, is a material qualification document only, with all the test requirements applicable only to a defined test coupon, not to production boards. So, it's useless for what you're trying to accomplish. As assemblers use A-610 - Acceptability Of E

Fuji Pick and Place Machines

Electronics Forum | Wed May 19 16:57:08 EDT 2004 | ricardof

We have in our facilities in Mexico more than 150 FUJI machines (CPs, IPs, QPs, GPs), they're in fact Bombproof, but it is not amazing to do that with 1206, SOTs on SOPs, we just feel a kind of disappointed with that 10K hours service, that means yo

Via holes and Wave Solder

Electronics Forum | Mon Mar 13 15:35:56 EST 2006 | russ

You're a piece of work! Why don't you work for any of the major wave companies? So how does slowing the conveyor speed eliminate drying flux? And when you slow it down, what speeds it up to make you say "I lower the wave because I get shorts going

Leaded and Lead-Free Wave Parameters

Electronics Forum | Wed May 21 13:59:19 EDT 2008 | pjc

Here's what I've seen for no-clean flux applications: Leaded: Dwell Time is? 2 - 3 seconds Top side board temp max? If some small SMT parts reflow are we too hot? 110 to 120C top side board temp just before hitting the wave(s) Pot temp. 245C Lea

CSM-84 pick and place machine.

Electronics Forum | Sat Feb 12 13:19:27 EST 2011 | tpappano

A simple trick I read either here or on another P&P forum is to use "Silly Putty". Place a small thin spot of Silly Putty on the top of the front conveyor rail, and put the machine in "manual" mode. Steer head #1 over the putty and lower it, leavin

Leaded and Lead-Free Wave Parameters

Electronics Forum | Fri May 23 18:55:20 EDT 2008 | gregoryyork

This is one of the biggest mistakes with the Lead Free process. We have all listened to the 'industry experts' and followed their advice and unfortunately got it wrong. Keep the dwell times (dependant on alloy selection) the same as Leaded so you are

First PCB and it didn't work

Electronics Forum | Tue Jan 07 02:04:45 EST 2020 | robl

Hi Mikey, Your signal pins (2 & 3) for USB1, 2, & 3 are all connected together so there is no way of splitting the incoming signals from the 3 ports. Normally there would be an IC (a USB hub controller) switching between the signals so that the PC

CCGA - Stencil design and Reflow Profiling

Electronics Forum | Wed Jul 24 17:25:01 EDT 2019 | davef

Your solder stencil design should follow all basic rules for solder stencil design are followed in accordance with IPC-7525 including adherence to an area ratio of 2:3 or greater and an aspect ratio of 1.5 or greater.

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