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PCB Manufacturer advice sought

:: EPE Chat Zone ­:: ­Radio Bygones Message Board :: » EPE Forum Archives 2010 - » Archive through 29 April, 2012 » PCB Manufacturer advice sought « Previous Next »

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mikehibbett
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Username: mikehibbett

Post Number: 1396
Registered: 04-2005


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Posted on Saturday, 14 April, 2012 - 10:38 am:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

Hi all,

I'm developing a low volume product that will have two 484 pin 1mm pitch BGA chips on it. BGA is a new area for me, and my usual PCB supplier can't make the boards.

I'm looking for a supplier, accessible from the UK, who can handle the following:

low volume ( 1 to 2 small boards, about 8 x 5 cm )
2 or 4 layer
4 thou tracks
vias between BGA pads
Ideally, able to assemble the board

Looking for low cost, as I'm probably going to need a few iterations to get this right.
Not too concerned about turn around time.

does anyone have any suggestions?

Thanks,

Mike
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phonoplug
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Username: phonoplug

Post Number: 274
Registered: 08-2009


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Posted on Saturday, 14 April, 2012 - 02:06 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

Hi Mike,

These 4 thou tracks - can they be 6 thou? That might open up more options. Designed a board a few months back with a similar part - a 1152 pin FPGA (1mm pitch again). Got a very good supplier for the PCB, but it does come at a price. I've just opened it up and the thinnest track I used was about 7.5 thou.

I'm not sure what you would class as 'low cost' for a board like this, I think even if its 2 layer the very thin tracks and 0.25mm vias with presumably around 0.45mm outer diameter mean its a pretty tough board to make.

Just checked a couple of my online suppliers - they are able to produce such a board:

A) Eurocircuits (Belgian, made in Hungary)through their 'Tech Pool' service. You coud be looking at about £200 for a couple of 4-layer boards.

B) PCB Cart (China). Looking at £30 a board but with a tooling cost of £150.

You'll really need to go elsewhere to get the board(s) assembled. I know some pooling PCB companies say they can assemble the board too (PCB train for example), but I'm not sure they'd want to get involved when you tell them its a high ball-count BGA.

As for assembly, this is perhaps more of a problem. With a chip like that you would probably have to accept you might loose a board and/or chip or two in getting the process right. In actual fact if you are prepared to accept possibly loosing one or two I could put them together for you. I don't have the specialist equipment to do it, but therefore won't charge the earth for it. I have two reflow ovens (one conveyor, one drawer) and a pick/place machine, though I would place the part by hand.

Perhaps if you can tell us how much the chip costs that might be a good place to start. The FPGA I designed onto the board mentioned above costs a bit over a grand so I went to a specialist! They charged me I think £540 + VAT to place 6 of them. All things considered it wasn't a bad price.

You can PM/email me if you want to discuss off-line.
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jgurley
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Username: jgurley

Post Number: 14
Registered: 12-2011

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Posted on Saturday, 14 April, 2012 - 02:21 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

BatchPCB.com is quick and inexpensive. 6mil limit there too, though.
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istedman
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Username: istedman

Post Number: 288
Registered: 05-2005


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Posted on Monday, 16 April, 2012 - 11:21 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

Mike,

I'll be amazed if you can route the BGA device out on anything less than a 4 layer PCB. The fact that you mention 4 thou tracks implies that you either need controlled impedances or you have a fine pitch (0.8mm or less) BGA. I have seen some graphics cards that uses a 4 layer board with a BGA GPU, but some other vendors parts require 6 layers or more to route.

I have used PCBTrain to fabricate PCBs but not to assemble anything yet. They charge a fixed price to place a BGA. You could contact them with your requirements?

Ian
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mikehibbett
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Username: mikehibbett

Post Number: 1397
Registered: 04-2005


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Posted on Monday, 16 April, 2012 - 11:57 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

Thanks Ian. Others have suggested PCBTrain too.

I've realised I can relax the track width quite a bit; it's a 1mm pitch BGA.

There are no high speed signals ( in fact just power, clock, program load and a slow speed serial interface. )

Given that I do need a decent power rail I'll give up on the 2 layer option :o)

Mike

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