Patent ID: 7772707

Claim:
A microelectronic workpiece used at a stage in manufacturing a plurality of microelectronic devices, comprising: a substrate having a device side and a backside; a plurality of dies formed on the device side of the substrate, the dies having integrated circuitry and a plurality of bond-pads electrically coupled to the integrated circuitry; a redistribution layer having a dielectric layer over the dies, ball-pads arranged in ball-pad arrays corresponding to the dies, and traces coupling the bond-pads of the dies to the ball-pads of corresponding ball-pad arrays, wherein the arrays of ball-pads are outboard of the bond-pads on the corresponding dies; and a heat curable protective layer on the backside of the substrate, wherein the protective layer is a polymeric material curable from a flowable state to a non-flowable state in response to heat having a temperature of approximately 50° C. to 500° C.