I've used Agilent (formerly HP) SO-8 parts in an isolated RS-232/RS-485
interface. I also seem to recall Toshiba and Sharp had SO-8 parts also.
The Agilent parts I used were HCPL0730s (I'm guessing way overkill in
speed and gain, therefore $$$) for your application.

A quick web search on the reveals Fairchild has a line of SO-8 parts,
probably available at Digikey.

http://www.fairchildsemi.com/collateral/opto/sop_optocouplers.pdf

(The HMA12x series look like they would work)

I'd check Agilent's web site also, I know they have an extensive line of SO-8 parts too.

Toshiba has 4 pin SOP package parts:

http://www.toshiba.com/taec/cgi-bin/display.cgi?table=Category&CategoryID=7073

Sharp also has some 4 pin SOP parts:

http://www.sharpsma.com/sma/Products/Prod-frame/opto.htm?main=http://www.sharpsma.com/sma/products/opto/photocoupler.htm

Those pages should get you started in the right direction, I hope.

Matt Pobursky
Maximum Performance Systems

On Fri, 5 Mar 2004 09:55:05 -0800, al smith wrote:
> SO8 will work....have a part number off the top of your head?  I found a
> Fairchild part, but it was a logic output, rather than a open collector
> transistor.
>

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