PCB assembly - minimum distance b/t components? Good China/EU factory?

[3dgeo]

Hi,

In a few month time I'll need to assemble two sided ~210mm x ~95mm PCB (components on one side, up to 15 SMD different components, up to 80 in total, minimum 100 PCB), so I need some assembly factory recommendations in China and EU, and specs for spacing if possible. I thought this is a perfect place to ask.
I know JLCPCB has best prices for making PCBs, but I need to assemble it as well.

My biggest concern is this 1210 RGB LED ring, they are very close to each other (~0.2 mm) and rotated every 12 deg.:



LEDs themselfs:
https://www.aliexpress.com/item/Wholesale-100pcs-RGB-POWER-TOP-1210-3528-SMD-SMT-PLCC-2-LED-Red-Green-Blue-New/32384196929.html

Any help/advice is highly apresheated.

[KL27x]

You need a starting point that is more than a picture of an unpopulated PCB? Are the LED dimensions actually larger than the edges of the pads? (If not, I doubt you have a problem; just get some quotes).

Like maybe make an outline for your library part, using the maximum tolerable dimensions in the datasheet. Then you can see how much clearance you actually have to work with in your PCB CAD software. Then you would have a number to put in "additional information" when you submit a quote.

[3dgeo]

You need a starting point that is more than a picture of an unpopulated PCB? Are the LED dimensions actually larger than the edges of the pads? (If not, I doubt you have a problem; just get some quotes).

Like maybe make an outline for your library part, using the maximum tolerable dimensions in the datasheet. Then you can see how much clearance you actually have to work with in your PCB CAD software. Then you would have a number to put in "additional information" when you submit a quote.

Thank You for Your reply, I know for sure that LEDs do not overlap, those silk screen squares represents LED size accurately, tho smallest distance between LEDs is ~0.2mm, can that be an issue when it comes to a component placement?

[SMTech]

0.2mm shouldn't be a challenge, that is well within the placement capabilities of most equipment, the key to delivering it here will be in how accurately the alignment system can see the device, potentially making it a job a machine with laser alignment might do more accurately than camera. I place quite a few LEDs of this style but I have the recognition tuned more towards sucessfully recognising the device than to getting superaccurate alignment, all the same its pretty consistent, less so when placing domed versions.

Where you have to be careful IME with very close proximity is with things like SOIC or Opto packages, they tend to have a distinct seam in the moulding which can sometimes challenge the min/max dimensions in the datasheet. Equally the accuracy for passives "chips" is always lower on placement machines as they are volume parts where accuracy is not supposed to matter, start sticking those right next to each other and now and again it might cause problems..

That said look at this if your contractor has issues, either its closer than you think or they aren't very good. I don't think special instructions should be required here.