Patent ID: 8797057

Claim:
A test structure for performing electrical tests of devices under one or more microbumps, comprising: at least one device; and a metal pad connected to an interconnect for the at least one device, the metal pad comprising: a first portion forming at least one microbump pad, wherein a width of the at least one microbump pad is equal to or less than about 50 μm, wherein the at least one microbump pad is covered by an under bump metallurgy (UBM) layer, and a second portion forming a test pad connected to the at least one microbump pad, wherein the test pad has a size large enough to allow circuit probing of the at least first device, and wherein a width of the test pad is greater than the at least one microbump pad, and the test pad is adapted to be covered after circuit probing by a passivation material to prevent particle and corrosion issues.