Electronics Forum: aging (Page 7 of 33)

Re: Aged Solder Paste

Electronics Forum | Sat Apr 04 17:11:29 EST 1998 | Steve Gregory

Can anyone help with advice on the possibility of "rejuvinating" aged solder paste for SMT applications. Thanks! Peter, I wouldn't even try...even if you had all the different chemicals that you needed to do it properly, the formula's f

smd capacitors- ICT measuring

Electronics Forum | Fri Jun 14 13:43:02 EDT 2013 | rway

The low value will be 0.624uF. You have to factor it from the low tolerance (-10%). So: 0.9 x 0.92 (machine tolerance) x 0.91 x 0.91 x 0.91 (3 decade aging factor for X7R dielectric). We factor hours at the 3rd decade (10,000 hours), but you can

TO99 age and reliability

Electronics Forum | Wed Jan 24 12:42:25 EST 2001 | traviss

I�m suddenly getting a very high failure rate in a TO99 component (National LM136AH-2.5). After some investigation we found some of these parts are more than 20 years old. What I am hoping for is that someone out there can help me find some standards

Substrate Au/Ni thickness

Electronics Forum | Thu Feb 15 07:25:05 EST 2001 | Nick

0.5um(Ni~6.5um) after reflow(data taken in 48hrs).But after performing temperature cycle test ,the former aging rate(from the shear strength ) seems faster than the latter.Why!?Someone call this the 'precipitation hardness',but what actually is it! A

Material Ageing and Storage

Electronics Forum | Thu Feb 22 21:01:12 EST 2001 | davef

We don't do this, but if we had to and lacking better advice, for all components I�d dry pack according to J-STD-033, store in a low temperature and humidity controlled environment [maybe using some semicon fab inert storage cabinets], review the eff

Re: Centech - Vapor Phase

Electronics Forum | Tue Oct 12 11:54:23 EDT 1999 | Brian

We (Compunetix, Inc.) need to sell a Centech Vapor Phase. What would be a good asking price. TIA You should be aware that vapour phase is on its way down the hill for environmental reasons. In any case, how can anyone recommend a price wit

Re: Universal Machines for Sale

Electronics Forum | Mon Apr 13 11:33:54 EDT 1998 | Erhard Hofmann

We are sell off all of our thru-hole machines. Universal Multi Mod 6772 Universal 6285 VCD Universal 2596 Sequencer All machine must go. Please offer us your machines including age, type of controllers, number of sequencer stations, ... wh

8mm Cover Tape Breakage

Electronics Forum | Tue May 28 17:02:46 EDT 2002 | dougt

I've had problems with this in the past, pretty sure it was due to age. Had a couple of old reels of dummy parts that would not allow for any type of stretching of the cover tape. I have also seen where the cover tape appears to shrink and it pulls

Board Profiling

Electronics Forum | Fri Oct 18 21:31:15 EDT 2002 | caldon

Many times the board may look the same but incases there could be subtle differences that could cause your process to go out of process limit. With boards that look alike you still need to consider: Solder paste (Is key to the reflow profile) compone

Simulation of Placement Cpk on Paste

Electronics Forum | Thu Nov 07 20:46:00 EST 2002 | davef

Most of the printer and dispenser equipment companies job-out this glass plate analysis for the factory, pre-shipment verification of the capability of their equipment. Check with your equipment supplier, find-out the company they use [If they do it

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