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"Bottom entry" SMT connectors for circular pins

J

John Devereux

Jan 1, 1970
0
Hi,

I am looking for some specialised "Bottom entry" connectors suitable for
circular pins.

You can get "bottom entry" or "pass through" socket connectors that sit on top
of your PCB, where the mating pins pass through holes in the board. So
you have:

..
.. X
.. ||X|| Connector, SMT preferred
.. ||X||
..==================X========== PCB
.. X
.. X
.. X
.. ===== Pin
..
..

There are lots available for 0.1" and 2.0mm pitch square pin headers,
designed for 0.025" or 0.5mm square pins.

Does anyone know of anything like this suitable for four round pins?
Ideally for a larger diameter than the 0.025". A wider pitch would be
good too, or single pin types I can place where I want.

Thanks,
 
L

legg

Jan 1, 1970
0
Hi,

I am looking for some specialised "Bottom entry" connectors suitable for
circular pins.

You can get "bottom entry" or "pass through" socket connectors that sit on top
of your PCB, where the mating pins pass through holes in the board. So
you have:

.
. X
. ||X|| Connector, SMT preferred
. ||X||
.==================X========== PCB
. X
. X
. X
. ===== Pin
.
.

There are lots available for 0.1" and 2.0mm pitch square pin headers,
designed for 0.025" or 0.5mm square pins.

Does anyone know of anything like this suitable for four round pins?
Ideally for a larger diameter than the 0.025". A wider pitch would be
good too, or single pin types I can place where I want.

Samtec FHP 0.187 pitch connectors have an SMT version. Alignment pins
are a useful option.

For multisourcing of smt, sticking with 0.1 pitch, double row might be
advisable.

You'd best use pins designed for the socket. Round is convenient for
no-one but the mfr of the round pin.

There are also bottom entry female 'faston' receptacles for .187
blade-type pins that aren't very smt, but you're drilling holes
anyway, so what the heck? Check out Zeirick 1118-6 / 6118-6.

RL
 
L

legg

Jan 1, 1970
0
Hi,

I am looking for some specialised "Bottom entry" connectors suitable for
circular pins.

You can get "bottom entry" or "pass through" socket connectors that sit on top
of your PCB, where the mating pins pass through holes in the board. So
you have:

.
. X
. ||X|| Connector, SMT preferred
. ||X||
.==================X========== PCB
. X
. X
. X
. ===== Pin
.
.

There are lots available for 0.1" and 2.0mm pitch square pin headers,
designed for 0.025" or 0.5mm square pins.

Does anyone know of anything like this suitable for four round pins?
Ideally for a larger diameter than the 0.025". A wider pitch would be
good too, or single pin types I can place where I want.

Thanks,

Samtec FHP 0.187 pitch connectors have an SMT version. Alignment pins
are a useful option.

For multisourcing of smt, sticking with 0.1 pitch, double row might be
advisable.

You'd best use pins designed for the socket. Round is convenient for
no-one but the mfr of the round pin.

There are also bottom entry female 'faston' receptacles for .187
blade-type pins that aren't very smt, but you're drilling holes
anyway, so what the heck? Check out Zeirick 1118-6 / 6118-6.

RL
 
J

John Devereux

Jan 1, 1970
0
legg said:
Samtec FHP 0.187 pitch connectors have an SMT version. Alignment pins
are a useful option.

For multisourcing of smt, sticking with 0.1 pitch, double row might be
advisable.

You'd best use pins designed for the socket. Round is convenient for
no-one but the mfr of the round pin.

There are also bottom entry female 'faston' receptacles for .187
blade-type pins that aren't very smt, but you're drilling holes
anyway, so what the heck? Check out Zeirick 1118-6 / 6118-6.

Thanks, I am trying to see if we really need the round pins. (It is for
a special high pressure hermetically sealed feed-through connector).

Currently I am leaning towards the type JL posted (not SMT) for single
pins. All the SMT stuff seems to be for square pin headers.
 
L

legg

Jan 1, 1970
0
This little filter board

ftp://jjlarkin.lmi.net/Filter1.jpg

ftp://jjlarkin.lmi.net/Filter2.jpg

uses round machined pins to give us a controlled standoff distance
above the main board. The female is broken off a SAMTEC SL-110-G-19
strip. The male, on the VME board, is BBS-110-G-B.

John
By bottom entry, the OP means that he wants the pin to penetrate the
board before entering the receptacle - and possibly passing through to
meet other pass-through or end receptacles on succeeding assemblies.

Tyco/Amp does pass-through pin sockets as illustrated, but the vast
majority are sealed at one end. The sealed version can do bottom
entry, even in wave-soldered assemblies, through insertion with the
correct orientation (and with the open end plugged to prevent solder
flow or gold contamination). Even the open-ended versions require this
orientation and 'plugging'.

There is always a prefered direction for pin insertion it seems, if
only to slacken the tolerance on pin-socket registration, but quite
frequently because insertion from other directions is mechanically
impossible, due to the retention function and contact area compression
features of the hardware's design. Watch for compatible connector
contact metalization - gold may not be suitable for repeated
insertions or higher power levels.

RL
 
J

John Devereux

Jan 1, 1970
0
legg said:
[...]
This little filter board

ftp://jjlarkin.lmi.net/Filter1.jpg

ftp://jjlarkin.lmi.net/Filter2.jpg

uses round machined pins to give us a controlled standoff distance
above the main board. The female is broken off a SAMTEC SL-110-G-19
strip. The male, on the VME board, is BBS-110-G-B.

John
By bottom entry, the OP means that he wants the pin to penetrate the
board before entering the receptacle - and possibly passing through to
meet other pass-through or end receptacles on succeeding assemblies.

That's right. It doesn't need to actually pass through to anything
else. The point is to get near zero spacing under the PCB shown. In fact
I can probably accept some small fraction of a mm protrusion on the
underside, so those single pins type that push into a hole in the board
would be possible.

<http://www.harwin.com/include/downloads/drawings/H3183.PDF>

If there was a rectangular SMT socket specified for round pins that
might be less work to assemble.
 
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