Can you find a way to thermally protect the lens area?  Can the supplier offer a version with a thermal tape applied to protect from reflow?  We have some digital sensor devices in the same thermal situation.  But we have very tight placement tolerances so we made a fixture for the alignment and have to hand solder them on.  

Kat


>>> [log in to unmask] 09/12/03 03:56AM >>>
We have a customer who is looking at assembling some surface mount LEDs to a
FR-4 board. We are told that the parts will not stand conventional reflow
temperatures (they themselves are made with a LMP solder, and the lens is
temperature sensitive). At this stage, I don't know much more detail.

The query is whether he could print conventional paste, place the devices
and then reflow each joint individually, by using a robot. But a soldering
iron applied the paste will cause spitting, solder balls, etc.

Perhaps a thermode could be applied to the joint and a temperature ramp up
applied, which will safely reflow the paste, if such a thing exists and can
be mounted to a robot.

I would be interested in general thoughts on how to process these parts.
Maybe not even solder...

TIA,
Peter
--
--------------------------------------------------------
Peter Swanson           [log in to unmask]
INTERTRONICS               http://www.intertronics.co.uk
Tel: +44 1865 842842                Oxfordshire, England

INTERTRONICS is dedicated to providing quality material,
consumable and equipment solutions to high technology
assembly industries, with the highest levels of technical
support and customer service.

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