Author Topic: what longest and most wide single board you seen?  (Read 990 times)

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Offline aqarwaenTopic starter

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what longest and most wide single board you seen?
« on: September 04, 2020, 06:50:04 pm »
i was watching dave teardown videos..dave said large boards cost more and need more tweaks to make and he said its cheaper to make them in smaller pices to save money..so my question what is largest board in one pice you seen?how large boards you seen in one pice?would it possible to manufacture 65 inch tv size single board in one pice or how large you could go?
 

Online joeqsmith

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Re: what longest and most wide single board you seen?
« Reply #1 on: September 04, 2020, 09:01:42 pm »
I would imagine, like any board, the material, number of layers, spacing, controlled impedance.... will all be part of it.  Yields from the board house may go into the toilet.       

Four of them come to mine.  One very old using a mix of surface mount and through hole on FR4, 4 layer.  I would guess was around 16" X 14".    I am looking at one that is a little newer on Kapton, all surface mount which is 10" X 15".   This one has no board stiffeners as it's on an aluminum substrate.   We made some larger ones from Arlon.   The worst was a power supply that I bet was close to that 16X14 board that required several stiffeners.  We later changed that design to a board maybe 6X6.   

I would talk with your board houses and see what they have to say.   You may be shopping around a bit.

Offline TerraHertz

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Re: what longest and most wide single board you seen?
« Reply #2 on: September 05, 2020, 12:44:36 am »
I think the largest PCB I've seen, are these. I have a stack of them, varying layouts but all the same card size. They are apparently from some huge vector processing mainframe, quite old. But the history is lost.

PCB aize is 515 x 482 mm, 2 mm thick. I don't know how many layers.
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Offline T3sl4co1l

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Re: what longest and most wide single board you seen?
« Reply #3 on: September 05, 2020, 03:03:03 am »
Have seen somewhat larger boards, albeit much lower density, in old industrial machines.

Think Mike (mikeselectricstuff) has made more than a few LED strips that challenge fabs on the aspect ratio.  He did a video some years ago discussing this; at some point it's better to use modest sized boards (say 1-2m long) and join them with connectors, than to make full length ones.  tl;dr ask your fab.

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« Last Edit: September 05, 2020, 03:04:34 am by T3sl4co1l »
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Offline johnh

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Re: what longest and most wide single board you seen?
« Reply #4 on: September 05, 2020, 07:07:14 am »
The largest board I have seen are from a classic Ericsson Axe Processor. This one was manufactured 1978


 

Offline daqq

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Re: what longest and most wide single board you seen?
« Reply #5 on: September 05, 2020, 07:14:25 am »
In person? Some giant backplane for a server or something. Can't remember the size, but it was huge. It was mostly connectors I think.

On picture? 26 meters in length: https://www.unmannedsystemstechnology.com/2019/03/worlds-longest-multilayer-flexible-pcb-manufactured-for-uav-wings/
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Offline Refrigerator

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Re: what longest and most wide single board you seen?
« Reply #6 on: September 06, 2020, 10:02:50 pm »
Not necessarily large, but i've seen a very long one in a big LG plasma TV. Basically as wide as the display.
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