A die holding tray useful for testing a plurality of individual dies
placed into the holding tray together with a method of making the same.
The holding tray has machined lateral and longitudinal sets of grooves
with one set of grooves filled with strips in order to form pockets from
the unfilled grooves. Vacuum channels are formed into the bottom of the
pockets, and dies are held in place during testing by the flatness of the
pocket bottoms and a drawn vacuum. Several embodiments are disclosed,
including machining grooves in a compliant layer.