Author Topic: USB connectors with SMD and through-hole bits  (Read 2024 times)

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Offline derGoldsteinTopic starter

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USB connectors with SMD and through-hole bits
« on: June 29, 2017, 07:20:38 pm »
I've been looking into different type-A USB sockets and many common ones have SMD leads as well as something that goes through the board.

I think the most common of this type are these:
http://www.mouser.com/ProductDetail/Mill-Max/896-43-004-00-000000/?qs=sGAEpiMZZMulM8LPOQ%252bykzAp4yt8IxVbC4TYTrunS64%3d
http://www.mouser.com/ProductDetail/Keystone-Electronics/920/?qs=sZfk%252bfAlGe6z2j%252biDJes9A==

They have the normal through-hole snap-in tabs, but the leads are SMT.

Then there are these:
http://www.mouser.com/Search/ProductDetail.aspx?R=87583-3010RPALFvirtualkey64910000virtualkey649-87583-3010RPALF
https://www.digikey.com/product-detail/en/amphenol-fci/87520-1010BLF/609-4965-ND/1528160

Which have a little "fork" that snaps into the hole in the board, which you don't have to solder, but you can (and probably should) for better mechanical stability.

My question is, how are these assembled? They're not zero-insertion-force components, but do some pick-and-place machines have the ability to handle them?
If not, then at what point during the assembly of the board would they be added? The SMD part suggests that you'd have the pads as part of a stencil, but then you'd have to take the boards out of the pick and place machine, add the USB sockets manually, and then reflow the whole thing.
Alternatively, you could add a stage between applying the solder paste and placing them into the pick and place machine in which you manually insert them.

Is there a standardized way of doing it?
 

Online Kean

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Re: USB connectors with SMD and through-hole bits
« Reply #1 on: July 01, 2017, 06:44:17 pm »
Yes, these types of parts are commonly inserted by hand following PnP and before reflow.  And from experience they'll usually need extra inspection & rework following reflow.  I've expereienced about a 5% failure rate due to poor solder joints on these types of connectors (the normal ones, not the snap-in style).  Production batches weren't big enough to refine processes to improve that.
 
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Offline zeqing

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Re: USB connectors with SMD and through-hole bits
« Reply #2 on: August 10, 2017, 03:55:53 am »
PCB assembly work for more than 5 years:
in normal standard, the following step for pick-n-place and the following procedule:
1. high speed PNP for resistor and capacitors.
2. low speed PNP for IC and SMD connector
3. one worker  for manually placing some components , for these can not be place by machine
4. one worker for checking
5. reflowing...
6. one worker to check the PCBA, if there any abnormal.
7. visual checking
8. other processing such as THT soldering.....

so your connectors will be placed in the step 3.
 


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