Patent ID: 8435835

Claim:
A method of making a semiconductor device, comprising: providing a base substrate including first and second opposing surfaces; forming a first etch-resistant conductive layer over the first surface of the base substrate; forming a second etch-resistant conductive layer over the second surface of the base substrate; providing a first semiconductor die including a plurality of bumps formed over contact pads on an active surface of the first semiconductor die; disposing the first semiconductor die on the base substrate with the bumps bonded to a first surface of the first etch-resistant conductive layer; depositing an encapsulant over the first semiconductor die and base substrate; removing a portion of the base substrate to form electrically isolated base leads between opposing portions of the first etch-resistant conductive layer and second etch-resistant conductive layer; and disposing a second semiconductor die on the encapsulant and a second surface of the first etch-resistant conductive layer between the base leads.