There will not be continuous exposure to daylight, only during installation on-site. Air will be "free" to move adjacent to the TIM sandwiched between a pair of die-castings though it will be warmed by the functioning product. Imagine a pair of nested pans 10-12" diam with TIM pads sandwiched...
Does anyone have experiences of using gap filler pads in applications where they may be exposed to (sheltered) outdoor environment conditions. So they can expect to see some dampness/moisture, minus 40C to +60C env. Life approx. 5 yr. Should be a dry assembly process.
Typically these gap...
thread820-398618
Following up on this RJ45 receptacle issue.
We knew that style with snap in pins cannot be used because they are incompatible with pick-&-place, so it had to be pure SMT.
Not too thrilled with our final choice so as we are now going to full production I will be closely watching...
Hi Kbujuru, joining in this conversation very late, but if you wanted to share the product type or some of the problems you anticipate having to deal with in terms of operating environment and materials/processes or whatever?
The Steinberg books are always a good bet for fundamentals though they...
Given a choice between thro' hole RJ45 board mounted connector and SMT style of same I would prefer the thro' hole. For long term physical reliability risks due to stresses from Cat5 cable installation in the field, and fatigue on the solder joints from thermal cycling with cable load.
In my...
Hi Forum,
I am curious if anyone has practical experience in use of any of the range of 3M embossed tapes/sheets?
Looking at die-cutting a 2" x 3" sheet to sandwich between two die-cast Alum (chromated) components that are lightly bolted together. Surfaces are to be 'as-cast', and are typical...
Reply from the manufacturer (respected N.A. supplier) is that the moisture is silicone oil - as suspected. In their view it is not a concern - which is not a surprising POV.
The oil does not appear until the unit is in service. So assembly is complete. Cosmetically there is no risk, now it's...
Any thoughts on the possible risks about the observation that silicone oils weep out of what are often called thermal gap pads? Is this normal/typical?
Result is light oily film on top of the device and on mating surface of the pad.
The compression is 15-25% of the nominal thickness - which is...
Thanks for suggestions, all.
I will check out the metal SD Cards though they look a little like St Steel appliances - "dressed up". They have, I think a plastic frame exposed around the edge but it's hard to see in pictures. And, of course we can't control what brand of card our customers may...
Anyone have suggestions for physical design of slot that have proven successful in reducing EMI? Assuming that a small grounded door is not an option.
We have experimented with slotted metal fascia plates and with metallized plastic fascia plates that recess the SD Card into a throat. Neither...
First, sorry for the cryptic subject line.
We design and manufacture enterprise IP imaging products the materials for which "need" to be UL94 HB as a minimum. You will know that in the case of resins, their FR rating is qualified with a specimen thickness. In essence UL/CSA requires that the...
I bought this book (publ. 1955) while on my continuing hunt for info and context on stamped metal cantilever contact springs. The book provides a treasure trove of useful resources on this topic - maybe 25 - 30% of the contents. Exactly what I was looking for & well worth the modest...
thread820-326262
This may be of interest to folks trying to form tidy sealed corners.
http://www.acf.at/lang/en/applications.html
A local vendor has this machine, the only drawback is that each corner shape (that is radius and wall height) requires a specific rolling tool. So, unless your...
As an aside, it is my understanding that when tin plating components that will be conducting RF energy, dull tin is likewise preferred. The presence of organic surface levellers in the plating interfere with the surface conduction of RF resulting in un-necessary losses.
"You will master any...
Perhaps I just have really poor resources, but hands up anyone else who is struggling with finding clarity on issues surrounding plating finishes and RoHS compliance?
We are looking at it from the design & specifying side & we hear so many myths about what is & isn't compliant.
I have queries...
Good topic, sorry can't help as we have a project that would suit, but is on long hold at present. A similar functioning procedure is offered by AVX Corp using Bayer PU resins - process is called PolyTect.
http://www.avxcorp.com/docs/catalogs/polytect.pdf
"You will master any feeling of...
This thread raises an issue which has been a difficulty for us several times, namely how do the makers of smaller LC Displays, say 2.5" to 4 or 5" intend they be mounted in a (typically) portable housing.
There are the regular issues of shock, sealing and etc. but none of these LCD's have...
We have done custom shield/heatsink using die-cut compliant thermal pads over BGA devices. Your production volumes would suggest the means of production for the shield/sink, but machining of alum is an option. Question will be how you need to attach the box to your pcb, if screws are not...
It's so many years ago that I cannot remember, but what is the guideline for the correct orientation of a wire bundle that must cross a hinge axis.
* Typical example, switches on a front panel that is hinged to front of a rack mount shelf.
* The wire bundle can approach the hinge at 90deg (wires...
I need to understand the role of the plenum in forced air cooling of electronics, please.
I have observed two quite different types of structures being called plenums, though they may operate on the same principle.
First is a fan fed box (typically a scroll type fan) from which air goes to an...
