Patent ID: 8651359

Claim:
A bonding apparatus for C4 bonding comprising a bonder head, said bonder head including: a conductive plate comprising a high thermal conductivity material having a thermal conductivity greater than 10 W/(m·K); a heater assembly in direct contact with said conductive plate; a vacuum manifold extending through the heater assembly and the conductive plate, wherein the vacuum manifold provides a plurality of openings to at least one central portion of a bottom surface of the conductive plate; a low thermal conductivity material layer including at least one hole therein, wherein said low thermal conductivity material layer covers at least a peripheral portion of said bottom surface of said conductive plate and does not cover said at least one center portion of said bottom surface, and said low thermal conductivity material layer comprises a low thermal conductivity material having a thermal conductivity less than 10 W/(m·K); and a cavity having a sidewall defined by sidewalls of the low thermal conductivity material and an upper surface defined by an exposed portion of the bottom surface of the conductive plate between the sidewalls of the low thermal conductive material, wherein the cavity interconnects the plurality of openings extending from the vacuum manifold.