Electronics Forum: 0-25 (Page 1 of 7)

Stencil Design for BGA with 0.2 mm Diameter Pad and 0.4 mm pitch

Electronics Forum | Thu Nov 14 21:47:41 EST 2019 | sssamw

Yes, 0.25x0.25 square could work @0.1 thickness, use nano-coating or electroform stencil for better solder paste release.

Post Reballing Solder Ball Inspection

Electronics Forum | Tue Jun 25 09:55:25 EDT 2013 | bandjwet

We are looking for a recommendation for a company that can perform solder ball inspection on BGAs. The devices are in trays and the the challenge is the ultra fine pitch (0.4mm) and ball size (0.25mm diam). We are looking for ball diameter and coplan

Stencil thickness

Electronics Forum | Thu Jun 16 18:19:05 EDT 2005 | Jason Fullerton

If the uBGA has aperatures that are 0.25mm square, you need to use a laser cut foil no thicker than 3.75 mils to get an area ratio of 0.67, which is the minimum rule of thumb - that's too thin! Electroform would probably work up to 4.5 mils thick.

Reflowed Component Placement Tolerance

Electronics Forum | Wed Oct 15 12:32:19 EDT 2003 | Gregg

We are looking at a design that has an smt led emiter and a corresponding smt detector. After reviewing the tolerance stackup, we need a reflowed placement accuracy of +/-0.25mm(+/-0.010") for each component. Any thoughts/opinions?

What is Cu-EFTEC 64T?

Electronics Forum | Thu May 06 17:23:02 EDT 2004 | davef

Ah, here it is: EFTEC-64T. A commercial leadframe material with the nominal composition of Cu-0.3Cr-0.25Sn-0.2Zn

Solder voids in PTH

Electronics Forum | Tue Feb 19 22:57:38 EST 2008 | davef

Duno. What's the diameter of: * Finished connector lead * Finished through hole We reckon: Lead size plus ~0.25mm [0.010"] is normal.

Screen cleaner evaluation

Electronics Forum | Mon Feb 04 12:28:28 EST 2008 | jseagle

1.0mm (0.039") 1.75X >0.5 to 1.0mm (0.02 to 0.039") 4X 0.25 to 0.5mm (0.00984 to 0.02") 10X

PCB finish requirement for COB process

Electronics Forum | Fri Sep 27 10:05:07 EDT 2002 | oconnorp

I spec COB using wire bond attach - 0.75um � 0.25 Gold over 5um � 3 Nickle.

BGA Tilt

Electronics Forum | Thu Feb 08 14:03:39 EST 2007 | dave

Hi All, What is the cause of BGA tilt ? I have a failed board and it seems to have approx 0.25 mm difference in height on one edge of the BGA to the other. It is notable under magnification. Is this caused by to much time above reflow temp or not

Board stop on DEK printer

Electronics Forum | Thu Mar 29 12:23:55 EDT 2007 | dekhead

Size is 21mm (relaxed) x 4mm (OD) x 0.25mm wire... Manufacturer is Flexo Springs But for an in stock item that costs not much more than $1... I would think hardly worth the time and effort to have one made.

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