Electronics Forum | Mon May 24 13:11:12 EDT 2010 | deanm
A guideline that I use agrees with MikeS: For 20mil pitch, apertures should be 9-10mil with a stencil thickness of 5-6mils to achieve an acceptable aspect ratio of 1.7. Just be sure you are using a mesh Type 3 or 4 solder paste. Otherwise, larger par
Electronics Forum | Thu May 31 22:35:23 EDT 2012 | jacktan
I have encountered PCB delam issue with high density PCB. PCB has 42 layers , 5 mm thickness ,laminate material is NelcoN4000-13EP,Tg 210C and Td 350C. Have pre-bake at 125 c for 12 hrs before assy.My reflow temp is standard with 243 peak and TAL is
Electronics Forum | Thu Mar 21 02:57:49 EDT 2019 | pauljohnson
My friend said DH-A2 rework station is popular and stable.You can learn more about it. https://www.amazon.co.uk/Dinghua-Automatic-Motherboard-Repairing-Replacement/dp/B00K081DJY/ref=sr_1_7?keywords=bga+machine&qid=1553151363&s=gateway&sr=8-7
Electronics Forum | Thu Aug 08 22:41:30 EDT 2019 | orbitcoms
The pick n place height for component was set to 1.4mm but I had not allowed for pin thickness. I added this (total height now 1.6mm) and I get very few solder bridges now. I might try 1.7 and see if it makes any further differnce
Electronics Forum | Fri Nov 20 01:00:50 EST 2015 | anilwagh
I am looking below parts of CP4-2. 1)1P150E-24-2 3)2MMB500U-01-1 3)3MMB50-4-1 4)4P300E-05-1 5)CACR-SR03BC IKS-Y264-1 6)CACR-SR10BC 1KS-Y262-1 7)CACR-SR44 BC 1BF-Y279-1
Electronics Forum | Thu May 29 07:52:44 EDT 2003 | davef
The permeability of polyamide film (Kapton) is 54 g/sq m/mil/day and the total absorption is 2.8 wt%. The absorption rate changes rapidly over time with a large percentage occurring in the first 5 minutes and nearly reaching completion in 30 min to
Electronics Forum | Tue Nov 04 15:17:52 EST 2008 | iziris
This is my first circuit board that I am attempting to build and need a little help. Not exactly sure what is going on but maybe one of you guys could give some input. I am attaching the electrical diagram I am using. Everything thing seems to be wor
Electronics Forum | Thu Feb 14 09:07:43 EST 2002 | PeteC
Looking at low cost reliable Mother-Daughter board interfaces. Looking at having the Mom w/ a routed out slot, like 1.7mm wide with solder lands on the bottom side then plugging in Daughter thru Mom's slot w/ the Daughter having board edge contacts t
Electronics Forum | Mon May 24 15:50:11 EDT 2004 | Rob
hi all What do you think about soldering pb-free in reflow oven (air) lenght 1,7m (5 zones top,bottom) with max zone temp. 300C? Do you think that this process will be stable? Our max PCb dimension 260x260 mm. When i compare different oven producer t
Electronics Forum | Mon Aug 21 10:47:48 EDT 2006 | FredC
Hello Mika, I just checked a windmill and a test nozzle we have on the bench. The useful travel of the nozzle before the risk of the crosspin getting stuck in the loading gate is 1.5mm, if it gets stuck it is the nozzle is 1.7 up. If the cross pin is
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