Electronics Forum: 028 (Page 1 of 3)

Is test vias a good idea??

Electronics Forum | Mon Jan 31 08:30:41 EST 2005 | davef

Yes, probing via is perfectly acceptable. Via: * Pad diameter is 0.028 inch * Via pitch minimum is 0.50 inch ... all of which is fairly common, even when probing test pads. [Your English is fine, at least as good a half the English speakers here.]

GDM 0603 nozzle type?

Electronics Forum | Tue Mar 01 03:25:33 EST 2005 | bing

We are using a GDM with a linear piston pump fitted to dispence adhesive on 0603's. Use Universal part number 43273801 needle with a 42346504 piston. The single needle dimentions are 0.010 ID, 0.028 OD, 0.005 stand off

132 QFN footprint

Electronics Forum | Mon Sep 03 10:50:47 EDT 2007 | kissanepat1

A suggestion for your stencil which works is as follows. Cut your stencil aperatures beyond your pads to a length of 0.1mm , this then allows the paste to pull back into the pad creating a blob of solder which can be inspected by AOI.Best length and

Wave Soldering 0.050 pitch connector

Electronics Forum | Wed Oct 25 13:42:32 EDT 2000 | Chris McDonald

I was wondering IF anybody has has success wave soldering a 50 (2 rows of 25) pin 0.050" pitch thru-hole connector. I seem to be getting alot of bridging no matter what I do. Is there a design spec for the size and shape of pads? The pads on the pcb

Re: fine pitch on thick copper

Electronics Forum | Tue Dec 21 16:47:15 EST 1999 | GERARDIN

Hello Pascal As mentioned by Wolfgang the key issue is the printing process capability. For a thick copper level 90�m we noticed that the pad reduction can be greater than 20% depending on supplier sources. Typicaly for a cad Width = 0.4 we can

Aperature opening for epoxy printing

Electronics Forum | Fri Aug 06 03:51:06 EDT 1999 | Thomas

Could someone give recommendation on the stencil opening for printing epoxy on HAL FR4 PCB for 0805 and 0603 size chips capacitors and resisitors. My regular stencil manufacturer recommend the following: Thickness: 8 mils 0805 opening: Oblong 0.35 X

What is the smallest hole size available through PCB123?

Electronics Forum | Thu Oct 31 02:43:55 EDT 2013 | hqew2013

The smallest finished hole available for 2 layer board is .020”. The smallest finished hole available for 4+ layer board is .014”. All holes are round and drilled through from top to bottom layer of board. No blind or buried vias. For holes = .15

Dye And Pry on WLP package BGAs

Electronics Forum | Mon Apr 06 09:04:31 EDT 2015 | jesseoliveira

Hi all! I work in FA Lab on Brazil. Recently we had a problem with a dye pry analysis of BGA component due to breakage of WLP package (wafer level packaging). In this case, WLP thickness is about 0.28mm and was damaged during pullout process. Our

Re: What is spec on stretch????

Electronics Forum | Fri Apr 16 17:19:59 EDT 1999 | Dave F

Hi, I just cheesed my previous attempt at this. I looked through IPC 600 and couldn't find anything relating to dimensional stability of a board with regard to stretch. I found bow and twist but nothing on size. I have a PCB that is .030"

Re: solder thief guidelines

Electronics Forum | Tue Aug 04 12:32:13 EDT 1998 | Bob Willis

The design rules for solder thiefs are that the extra pads must be bigger than the proceeding pads to be worth while as a minimum guide the pad is 3x the size of the proceeding pad so if the pad is 0.030" the thief would be 0.090" wide. As steve has

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