Homebrew PCBs

Similar to my other post I need some jumper posts on my SMT board.

Are there SMT mounting jumper pins? I'll them for changing some 
options as well as plugging in a ISCP connector for PIC 
reprogramming. 100mil centers for now.

tnx
jtm

Hello,

This one's easier. YES. They are available from any of the larger 
suppliers. The "legs" splay so they can have good mechanical 
attachment to the SMT board.

Ballendo

-- In Homebrew_PCBs@yahoogroups.com, "mdgolfbum" <jim@j...> wrote:

> Similar to my other post I need some jumper posts on my SMT board.
> 
> Are there SMT mounting jumper pins? I'll them for changing some 
> options as well as plugging in a ISCP connector for PIC 
> reprogramming. 100mil centers for now.
> 
> tnx
> jtm

You can get SMT jumper pins but you have to consider that they do not have the mechanical strength of a through hole part.  They'll probably be fine for jumpers where they're not changed very often but probably would not be suitable for ICSP as the stress of plugging and unpluging the cable as well as pull on the cable while it's connected will probably break the joint.  It might be acceptable if the ICSP is designed for firmware upgrading once or twice during the life of the product but generally through-hole would be recomended.  

Digikey has a variety of SMT headers but you probably won't find too much with .100mil centers.

Paul Davis

----- Original Message -----
From: mdgolfbum <jim@...>
Date: Tuesday, March 30, 2004 8:31 am

Subject: [Homebrew_PCBs] Jumpers on SMTs?

> Similar to my other post I need some jumper posts on my SMT board.
> 
> Are there SMT mounting jumper pins? I'll them for changing some 
> options as well as plugging in a ISCP connector for PIC 
> reprogramming. 100mil centers for now.
> 
> tnx
> jtm
>

On Tue, 30 Mar 2004 09:30:42 -0700, Paul Davis <paul_davis@...> wrote:

> You can get SMT jumper pins but you have to consider that they do not 
> have the mechanical strength of a through hole part.  They'll probably 
> be fine for jumpers where they're not changed very often but probably 
> would not be suitable for ICSP as the stress of plugging and unpluging 
> the cable as well as pull on the cable while it's connected will 
> probably break the joint.  It might be acceptable if the ICSP is 
> designed for firmware upgrading once or twice during the life of the 
> product but generally through-hole would be recomended.
>
> Digikey has a variety of SMT headers but you probably won't find too 
> much with .100mil centers.
>
> Paul Davis
>

I've seen a few which even i would trust.
they are thinner pins, with lower pitch (maybe 2mm).
they look the same, square pins and all.
I think they are kind of standard like the 2,54mm pitch headers...

smaller connectors need smaller force to pull off, so smd seems fine...

there are also very nice connectors for the etched cables, they will open 
and release
the cable if you pull upwards.

ST