Electronics Forum: 4mm (Page 16 of 29)

Land size

Electronics Forum | Mon Jul 07 11:46:29 EDT 2008 | aj

Hi All, Can anyone advise the spec for land size of a lead 0.2mm in width? I am placing a TQFP128 0.4mm pitch, the leads seem to be wider than the actual pads they are been placed on? I am also experiencing poor wetting on this part , it has NiPdAU

SMT Connector, Placement Issues

Electronics Forum | Mon Oct 06 14:10:55 EDT 2008 | chineechooze

0.001969" You say that 0.008" of "slop" is un-doable; hence, the reasons for our failures. Any basis for that statement? Are rated accuracies from placement equipment manufacturers typically "exgaggerated?" 2. On PCB Fab side of things, what is

Stencil Design

Electronics Forum | Mon Jun 01 18:44:54 EDT 2009 | scunneen

Hello there, I have a new board, fairly heavily populated with a number of FPBGA on it. The smallest has a pitch of .4mm.I have 3 questions, 1st what is the best appeture for this small pitch. 2 Will type 3 paste work or will I need type 4, and fina

Flying Diode

Electronics Forum | Tue Jun 07 00:21:42 EDT 2011 | jacki

Hi All Currently, we encountered that the schottky barrier diode was up side down or misalignment during SMT process.And, many parts were blown away as pick up error. What we found is its package space is a little bigger for parts to move. I seek y

Stencil aperture positional accuracy

Electronics Forum | Thu Jun 14 13:12:53 EDT 2012 | scottp

I haven't been in a bad enough situation to try it yet, but I had a conversation with Alpha Metals when we started doing 0.4 mm pitch and they mentioned that if we got into a situation like yours we could send them a board and they'd modify the artwo

Stencil aperture positional accuracy

Electronics Forum | Thu Jun 14 21:48:41 EDT 2012 | kmots15

We work with a lot of larger boards over 24", haven't run into this issue yet. I agree with scott could be your board supplier if they are lower quality, from something as simple as unit conversions in CAD to dealing with different temperatures. A

SMD Via hole design-thermal performance

Electronics Forum | Thu Oct 30 23:39:10 EDT 2014 | beilimanu

No paper thing, while I can make some suggestions based on my experience. what is the size of your via? If it's smaller than dia0.4mm, in PCB production process it should be filled by soldermask. So my suggestion is design it to be full filled by SM

Adaptable PCB support systems for use in pick and place machines?

Electronics Forum | Tue Aug 04 14:56:27 EDT 2015 | sarason

Adding to my previous message this could be solved fairly easily for the general case with a jig made from 3.2 - 4mm aluminium aircraft grade plate. you would machine the bottom side edges to give a 1.6 mm thickness, then machine the top side to leav

Mydata TP9-2 and TP11-UFP difference

Electronics Forum | Thu Jul 18 17:41:31 EDT 2019 | rgduval

The UFP was a designation for "ultra-fine-pitch"; but, for the most part, you should be able to get the same placements out of both machines. Anything 0402 or above can be mechanically centered. The UFP machine will lean on optical centering for .5

Wave soldering - black residue / bridging

Electronics Forum | Fri Dec 27 16:12:54 EST 2019 | anteiv

thank you for reply here is picture of the board https://imgur.com/a/i2MfFBw on the bottom are pins/components which height is about 3-4 mm from bottom of the board we had to increase distance of board from nozzle to make clearance and we increas


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