Electronics Forum: pass (Page 100 of 142)

Varistors that leak, political football anyone?

Electronics Forum | Wed Jul 12 09:45:16 EDT 2000 | Charlie

The following are questions my boss has ask me to send out to you folks. This is done in an effort to see "What does the rest of the world do?" [if such a world could possibly exists, in the first place]. If you would select any or all questions to r

Re: PCB Material selection

Electronics Forum | Mon Jun 26 20:34:14 EDT 2000 | Dave F

Gary: Allow expand on this topic a bit. Back in the gray skied past when people wore calculators on their belts, rather than pagers n Palms, and didn�t drink California spill, they used HASS that you mentioned and HALT (Highly Accelerated Life Test

Re: testing after SMt assembly

Electronics Forum | Wed Jul 21 10:11:57 EDT 1999 | Mark Quealy

Dear all Please help me to know what kind of tests usually done after SMT Pick & place and reflow oven. Our appliocation is Mainly fabrication of mother boards. Thanks In theory, ICT is the classical answer (In-Circuit Test).

Re: Exhausting of flux in reflow ovens

Electronics Forum | Fri May 14 15:03:19 EDT 1999 | lima

Does anyone know of any industry guidelines for the exhausting of volatiles in reflow ovens? I've seen some numbers like 1,000ppm for the oven atmosphere, but is this typical? My concern is the volatiles in my WS629 solder paste may be

Re: shield placement?

Electronics Forum | Thu Apr 29 13:33:13 EDT 1999 | KEVIN SIMPSON

Hi everyone, We started our first machine placed shield test today.We will be machine placing shields with in the next two months. I used a Fuji Qp242 today. There were no problems with pickup etc,. just vision errors. I'm sure we will

Re: Transient Voltage Suppressors

Electronics Forum | Fri Mar 12 20:19:46 EST 1999 | Dean

AVX and a few other companies make these chip transient voltage suppressors (TVS) parts that are a real *PAIN* to use. According to AVX: "Due to the semiconducting nature of the doped Zinc Oxide (ZnO) ceramic material, SMT TransGuards ar

Re: Moisture Bake-out of Plastic Parts

Electronics Forum | Tue May 26 15:49:05 EDT 1998 | Earl Moon

We currently bake plastic SMT parts in accordance with the IPC guidelines for moisture sensitive parts. Because we have double-sided boards that are subjected to either an aqueous or semi-aqueous cleaning process, we do a 24 hour bake at 125 deg

Yield on 0402 SMT Printed Circuit Board Assemblies

Electronics Forum | Fri Jan 05 12:17:31 EST 2007 | Cmiller

Our first pass yield across all our products is above 95% but we include anything that does not meet IPC standards. Probably 75% of our failures are not electrical. AOI is a great tool to get a consistent measure of your process. I dont know how anyo

Unusual board with BGA

Electronics Forum | Fri Dec 21 15:32:57 EST 2007 | rwyman

Hey SWAG- Not an uncommon scenario where I'm at. But the bottom line is, as others have said: Profile, profile, profile. Here, we have dedicated profile boards for each product we build and in most cases they're EXACT representations (my library i


Electronics Forum | Tue Aug 26 16:24:18 EDT 2008 | rway

We currently use a YesTech M1 system and we are looking to buy another. Two important areas to look at when pursuing AOI equipment: 1) Camera resolution 2) Light sources Depending on your needs, camera resolution can be important depending on the si

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