Can anyone suggest a card edge connector with 72to124 pins that is 50mm/2in in width

I have a project I am designing and I need a card edge connector that has at least 72 contacts or more and also is in a footprint of 5cm / 50mm / 2 inches wide.

Can anyone suggest a card edge connector that fits that profile?

Obviously this will be SMD and it will be similar in overall size as the last picture below.

Any help would be appreciated.

Just as some experimenting I tried a couple of hacks.

I first looked into mini pci board format, it is close but at 59.6mm with 124 pins, it is just a little to big for my needs.

I really need somewhere between 48 and 52mm



I then looked at a so dimm 200 pin, this is way to big at 68mm total, but if it was cut at the polarity wedge it would be the right size, as in the pictures below.



SO DIMM 200 CONTACT


SO DIMM with extra covered

There is a rather rare 72-pin SODIMM which was used in some older laptops and was adopted by a photocopier manufacturer. The module is approximately 2" wide.

I was trying to buy a socket some time back and was not successful in finding a supplier. I found a manufacturer but I can't remember who it was, it was a UK company, I think.

Rob B said:

There is a rather rare 72-pin SODIMM which was used in some older laptops and was adapted by a photocopier manufacturer. The module is approximately 2" wide.

I was trying to buy a socket some time back and was not successful in finding a supplier. I found a manufacturer but I can't remember who it was, it was a UK company, I think.

Click to expand...

I had found a similar microdimm, same size but it was 172 pins which I felt would make the traces too small for my PCB ability, probably in the range of .4 when I can only go as small as .6

**broken link removed**

---------- Post added at 14:39 ---------- Previous post was at 14:37 ----------

Otherwise it is the perfect size.

Have you considered the socket for the module?

Rob B said:

Have you considered the socket for the module?

Click to expand...

Im not sure what you mean?

If you need to mount your module on another board you will need a socket to suit your module's edge connector and form factor.

Rob B said:

If you need to mount your module on another board you will need a socket to suit your module's edge connector and form factor.

Click to expand...

Which is what I am looking for. The card edge design is only related to whatever socket/connector I find that closest fits the 48-52mm length 72pin or better connections.

The parent board needs the connector mounted on it to accept the card edge module.

I will make the card edge circuit match the connector, I am not looking for a specific connector for a specific card edge, but one that fits the criteria closely.

According to your description, Samtec MEC1-140 (2x40 positions 1 mm grid direct connector) would fit. It's similar to PCIe micro card connector, but different number of positions.

I originally had pin header and female receptacles, but at 2.54 pitch that results in only 24 pins in 50mm/2inches I need to increase that to closer to 64 pins in the same space, that is what sent me on the card edge connector hunt.

---------- Post added at 15:54 ---------- Previous post was at 15:44 ----------

FvM said:

According to your description, Samtec MEC1-140 (2x40 positions 1 mm grid direct connector) would fit. It's similar to PCIe micro card connector, but different number of positions.

Click to expand...

Thanks for the info, but its too large a foot print, physical width and depth, I had toyed with these SLA062D1 - Jameco Valuepro - datasheet but they were huge compared to both the parent board and card edge module circuit, which is part of what sent me down the path of mini pci and so dimm sockets much smaller depth and width.

This would be one solution but the website might have some other suitable connectors.

The SODIMM72 is 1.27mm pitch and the vertical mounting socket will be easier to solder without using a stencil and reflow. I think some of the pins in a horizontal mounting one (like in a laptop) might be obscured for hand soldering (if you are hand soldering).

Go to this link then Alphabetical Search By Series and look for DM-72P.

jst.com/home8.html

What's your footprint size restriction?

but its too large a foot print, physical width and depth

Click to expand...

It's according to your specifcation, as far yet told. You may want to me more specific, if you have additional requirements.
1 mm pitch connectors aren't smaller as far as I'm aware of, e.g. PCI express card socket is the same size. Of course, smaller pitch connectors are availiable from various vendors.

P.S.: I wonder if indirect connectors are better suited. They can be considerably smaller than direct connectors and you don't need the galvanical "heavy" gold plating in PCB production.

FvM said:

It's according to your specifcation, as far yet told. You may want to me more specific, if you have additional requirements.
1 mm pitch connectors aren't smaller as far as I'm aware of, e.g. PCI express card socket is the same size. Of course, smaller pitch connectors are availiable from various vendors.

P.S.: I wonder if indirect connectors are better suited. They can be considerably smaller than direct connectors and you don't need the galvanical "heavy" gold plating in PCB production.

Click to expand...

Sorry I wasn't more specific, its sometimes so stuck in your head when you've been eating and breathing a problem that you forget not everyone "knows what you know" about it.

It looks like the DM-72P that ROB B mentions above is the beasty I am after( if I can source it in any quantities), even the fact that it is vertical works, as that was a longer term goal, I was going to settle for flat mount if I had to, but vertical is choice, again something I didn't include originally.

P.S.: I wonder if indirect connectors are better suited. They can be considerably smaller than direct connectors and you don't need the galvanical "heavy" gold plating in PCB production.

Click to expand...

Any idea is welcome, I am not locked into anything, except that I need it to be stable sourced so it can be produced in quantity.

Thanks again for your help and please feel free to continue if you can elaborate on "indirect connectors"

---------- Post added at 00:58 ---------- Previous post was at 00:40 ----------

Rob B said:

This would be one solution but the website might have some other suitable connectors.

The SODIMM72 is 1.27mm pitch and the vertical mounting socket will be easier to solder without using a stencil and reflow. I think some of the pins in a horizontal mounting one (like in a laptop) might be obscured for hand soldering (if you are hand soldering).

Go to this link then Alphabetical Search By Series and look for DM-72P.

jst.com/home8.html

What's your footprint size restriction?

Click to expand...

This looks to be the whale I be looking for, even the fact that it is vertical is good because that was a longer term goal, I was going to settle for flat mount and hope to find vertical.

Now the quest begins to source in quantity or find an equivalent, although as i said Im still open to other ideas, this is definitely the right track.

My foot print is to daughter board a parent board that is about 2.7 inches to 3 inches square(68.5mm to 76.2mm) with components on the parent board the mini pci connector was a tight fit at 59.5mm ( I am not using mini pci connector or circuits ) which set my goal at closer to 48mm to 52 millimeter in size target.

---------- Post added at 01:09 ---------- Previous post was at 00:58 ----------

The DM-72p you suggested comes in at 44.45mm so well with in the target with the minimum connector count of 72.

All of the dimensions for the card edge were internal, so there is the over head of the locking mechanism which with every other choice put it outside the parent board footprint but the DM-72p full width ( socket and lock wings / full assembly ) comes in at 61.9mm which is well within the parent board width 68.5mm minimum.

So it is definitely the right ballpark if I can source it, if I cant source ( at least in the thousands ) then the quest begins to find an exact cousin to the DM-72p

---------- Post added at 02:10 ---------- Previous post was at 01:09 ----------

Upon further review of the full data sheet for the DM-72p it is close, but it is a little too tall, its 14mm what I need is closer to the dimm socket height between 5.5mm and 8mm vertical.

But I am on the trail none the less.

Still looking any help would be appreciated.