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Strange, Surface mount pins. Anybody seen these for sale?

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deef

Thu Mar 16 2006, 01:50AM

Registered Member #207 Joined: Sat Feb 18 2006, 05:14PM
Location:
Posts: 45

Hello,

I'm looking to buy some pins that can be soldered onto PCB boards (non-through hole) and allow the PCB to be inserted into a standard DIP socket.

A picture is worth a thousands words, so take a look:

The chip in the above picture has 24 of these pins (exactly what i'm looking for) around the perimeter of the chip. Does anybody know of any part numbers? or has anyone seen anything like this for sale before? I'm looking to find some.

Thanks a bunch,
deef

Tipp

Thu Mar 16 2006, 02:20AM

Registered Member #215 Joined: Sun Feb 19 2006, 09:14PM
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Posts: 30

You just want the pins?

Wow...never heard of anyone wanting these before. I'll have a look around...

phil

Thu Mar 16 2006, 03:23AM

Registered Member #314 Joined: Mon Mar 13 2006, 03:12AM
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Posts: 52

I've done something similar. But i went to radioshack and got one of thier circuit board making kits. The rest is just carefull measurements, a little drilling, and some soldering.

deef

Thu Mar 16 2006, 03:38AM

Registered Member #207 Joined: Sat Feb 18 2006, 05:14PM
Location:
Posts: 45

Tipp wrote ...

You just want the pins?

You bet! I'm just interested in those pins. I'd like to use them in some of my own designs. I have no problem finding through-hole ones (Like a male pin header). But i'm specifically looking for surface mount ones of the style I indicated in my first post.

Thanks for your reply, though :)

deef

...

Thu Mar 16 2006, 04:19AM

Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445

I have seen something like that used to make connections to the gloass on LCDs...

If you find them sent a few over my way

Although...
why not just use a smd .1" header or some bent over wire?

deef

Thu Mar 16 2006, 03:38PM

Registered Member #207 Joined: Sat Feb 18 2006, 05:14PM
Location:
Posts: 45

... wrote ...

why not just use a smd .1" header or some bent over wire?

A SMD header would work, so long as it's extremely low profile. I'm trying to avoid (i think they call it "framing") hardware around the pins, like plastic sockets, or holders, or anything as they would take up excess space.

PCB area is very limited in the design.

I'm opposed to using bent over wires because I plan on ordering ~8000 of these little darlings, once I can figure out what they're called. :) So, bending the wires wouldn't be much fun. Good suggestion, though.

I was able to find this:

which would probably accomplish what I'm trying to do. But i'll keep this thread active anyways, just to see if anybody else has any ideas.

Thanks again,
deef

HV Enthusiast

Thu Mar 16 2006, 04:18PM

Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
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Posts: 3068

Those pins (your first post) and the ones you mentioned in your last post take up just as much area as a simple thru-hole header strip.

You are going to find that what you propose is very labor intensive (unless you can get a machine to do it) so the thru-hole header would work very nicely and be very simple as well.

craigsarea

Thu Mar 16 2006, 06:19PM

Registered Member #130 Joined: Fri Feb 10 2006, 08:12PM
Location:
Posts: 15

Are the first 2 items on this page what you're looking for:

It's hard to tell from the pictures so they might not be any use.

deef

Thu Mar 16 2006, 07:42PM

Registered Member #207 Joined: Sat Feb 18 2006, 05:14PM
Location:
Posts: 45

EastVoltResearch wrote ...

Those pins (your first post) and the ones you mentioned in your last post take up just as much area as a simple thru-hole header strip....

You have some good points and you're right about the surface area. The pad-sizes would be practically the same. My idea was to use surface mount so that I will be able to mount other surface mount components on the opposite site of the board aswell. With through-hole you have the obigilitory lead-with-solder on the reverse side of the board. I'm trying to avoid this so that parts can be mounted on both sides of the board and connectivity can be accomplished by small vias.

As for the labour, you're right again. But whatcha gunna do?

At this time i'm more worried about the logistics of spacing.

deef

mikeselectricstuff

Thu Mar 16 2006, 11:27PM

Registered Member #311 Joined: Sun Mar 12 2006, 08:28PM
Location:
Posts: 253

These pins come on a carrier strip, ready-spaced with the correct spacing, so the whole strip is placed on the edge of the PCB and the carrier bar snapped off. They are then soldered as part of the normal SMD reflow process, so it is not especially labour intensive.

They appear to be somewhat elusive parts however - One of my customers uses them but his comment was "we bought a huge reel, a lifetome's supply, years ago & can't remember where from."
Your best bet is to talk to an assembly house that does ceramic hybrids as these are used exensively on these.
I can post a picture of the pins as they come on the carrier bar tomorrow if anyone's interested,

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