Electronics Forum | Tue Sep 01 09:24:23 EDT 1998 | Earl Moon
| We�ve been thinking again and need your help in sorting through an issue related to deionized (DI) water cleaning of assembled boards. | THE BACKGROUND: The water reclaiming systems goes: gross filter, fine filter, carbon bed, mixed resin bed, ca
Electronics Forum | Fri Aug 28 15:39:14 EDT 1998 | smd
Does anyone know about the ANSI/IPC PCB warpage standard? What is the best way to determine weather boards are warped or not? What equipment works best? Or, is there a general rule of thumb that is also compliant with the standard? I would like to he
Electronics Forum | Fri Aug 28 16:24:56 EDT 1998 | Dave F
| Does anyone know about the ANSI/IPC PCB warpage standard? What is the best way to determine weather boards are warped or not? What equipment works best? Or, is there a general rule of thumb that is also compliant with the standard? I would like to
Electronics Forum | Tue Aug 25 17:49:15 EDT 1998 | Earl Moon
| Hello, | Our PWB supplier has requested that a change in the laminate material to reduce the incidence of pad lifting. The standard laminate materials (Polyclad PCL-FR-226 with a glass transition temperature of 135 C) have greater z-axis thermal e
Electronics Forum | Fri Aug 14 12:43:10 EDT 1998 | Upinder Singh
| Electrical Eng. is looking for 5 micrograms per sq centimeter. After the board has been cleaned. Is this possible on a fully assembled bd? Yes, u can go to the mentioned level of cleanliness.....but can u be a bit more elaborative. Recently I did
Electronics Forum | Fri Aug 14 10:26:55 EDT 1998 | Mike Konrad
5 micrograms per sq. cm. is actually not too clean. The maximum military allowed post-clean, on-board contamination is 5.7 micrograms of NaCl /cm squared (when using the Zero-Ion brand ionic contamination tester). We are use to seeing cleanliness re
Electronics Forum | Fri Aug 07 07:52:15 EDT 1998 | Earl Moon
| | Is there any problem using SMT on gold boards? 15 years ago we were told not to use gold boards, but I can't remember why. Judging by the other postings it now appears to be common. Only problem I see is that the nickel should be plated, not e
Electronics Forum | Wed Aug 05 20:48:50 EDT 1998 | Ron Costa
I'm currently running a double sided paste smt board loaded with 0603's, on the secondary side. Many of the 0603 devices tombstone during reflow if the parts are not perfectly centered on the pads. Is this caused by the .008 foil thickness? Has anyon
Electronics Forum | Wed Jul 29 10:39:57 EDT 1998 | Ryan Jennens
Howdy all- Does anybody have any experience with solid solder deposits as an alternative to paste deposits? I have heard many good things, but do board fabricators have the technology to do this? Where can I get more information on how to try
Electronics Forum | Tue Jul 21 06:59:53 EDT 1998 | WAYNE
| Panasonic Create: What (Where) are your pad design and design quidelines that you have in-place? Dave F Dave" Thanks for the response. Many people I have talked with are interested in 201's, but are not placing at this time. I am curious about
