A semiconductor package by which contacts are made to both sides of the
dice is manufactured on a wafer scale. The back side of the wafer is
attached to a metal plate. The scribe lines separating the dice are saw
cut to expose the metal plate but the cuts do not extend through the
metal plate. A metal layer, which may include a number of sublayers, is
formed on the front side of the dice, the metal covering the exposed
portions of the metal plate and extending the side edges of the dice.
Separate sections of the metal layer may also cover connection pads on
the front side of the dice. A second set of saw cuts are made coincident
with the first set of saw cuts, using a blade that is narrower than the
blade used to make the first set of saw cuts. As a result, the metal
layer remains on the side edges of the dice connecting the back and front
sides of the dice (via the metal plate). Since no wire bonds are
required, the resulting package is rugged and provides a low-resistance
electrical connection between the back and front sides of the dice.