Electronics Forum | Wed Jun 25 12:20:03 EDT 2003 | russ
This may make it easy, Do you really need soak? Or can you just ramp to reflow. Most pastes that I am aware of perform just as well using the linear ramp as opposed to the ramp/soak /spike. Now, out of curiosity how are you attaching the thermocou
Electronics Forum | Tue Jun 17 08:52:39 EDT 2003 | russ
Aspect ratio = width of aperture divided by height. E.G. 6 mil stencil at 9 mil wide = aspect ratio of 1.5. Value should be 1.5 min. Area ratio - use when length and width of pad are roughly same dimension like for BGAs and 0805 and smaller R-nets
Electronics Forum | Wed Jun 18 06:41:34 EDT 2003 | emeto
Hi Jipp, If we are talking about 200-500 boards per month the main question is"Is it reasonable to go for semi-automatic production?". You will nead at least 1.Manual stencil printer 2.P&P machine 3.Infrared dryer or reflow oven Most expensive par
Electronics Forum | Wed Jun 18 16:03:03 EDT 2003 | mkehoe
Orrrrr, just buy a small reflow oven, 5K to 7K, and eliminate the paste printing by using solid solder deposition. No shorts, no opens, no cleaning, and no voids. www.sipad.com If you decide to print your own paste later you can invest the extra 30
Electronics Forum | Thu Jun 19 10:02:48 EDT 2003 | caldon
Russ- You are correct!! Manncorp is not an OEM, but they do have exclusive North American rights to certain Product lines. OEP is better named Original Equipment Provider. I do disagree with you though on the service issue. Siemens Has a problem th
Electronics Forum | Wed Jun 18 16:35:28 EDT 2003 | Mark Miles
I am in the process of building a pneumatic paint bomb for the scenario paintball games that I host. What I need is a countdown timer with a red led display which will actuate a solenoid to trip a switch and close a curcuit for 1 second. I will pay t
Electronics Forum | Thu Jun 19 20:47:57 EDT 2003 | davef
Your solders could have vasty different liquidous points. Check with your suppliers to determine the appropriateness of the materials you have selected. Awhile ago Jim Zanolli at Teka hosted an OnBoard Forum here at SMTnet. He'd be happy to give y
Electronics Forum | Fri Jun 20 09:38:56 EDT 2003 | caldon
Hi John- First, I do not have first hand experience so my input is pure theory. This type of package (in Some Cases) has a center grounding bonds and leadless legs ups the difficulty tremendously. With no stand-off from the Balls(or Legs) when the so
Electronics Forum | Tue Jul 08 18:53:21 EDT 2003 | MA/NY DDave
Hi The answer in general is no mixing of Lead Free with Sn/Pb solder. If you look at reliability data, failures after stress tests and then SEMs, failures occur at grain boundaries inside the joint. Lots more happens. By the way this mixing happe
Electronics Forum | Tue Jun 24 17:52:39 EDT 2003 | russ
i don't know of anything on the market nut you may just want to draw one up and have it built either externally or even internaly. I picture a small square of ESD material with a lip around it with a small opening in one corner. Do you receive any I
