Abstract:
The purpose of this independent study was to reduce the raw material costs used in the production of wire bonding by using copper wire instead of gold wire with Six-Sigma's technique for manufacturing integrated circuits. The goal is to reduce the cost of raw materials, such as wire with a diameter of 20 microns in TSSOP56 products and to improve the bonding capabilities of the wire in order to be suitable for raw materials such as copper wire and which must past a reliability test of the product according to terms set out in the CTQ.
The implementation process using Six Sigma began by identifying the problems, found in integrated circuits a gold wire elements representing 42.5% of total raw material costs, and should be replaced by copper wire. Changing the raw materials to copper during the wire bonding process requires finding a parameter window that is safe, by using the main parameters, which include bond time, bond temperature, USG, and bonding force.
The result of transforming raw materials into copper wire welding processes can reduce costs of raw material to meet the target of 91.27% per 1,000 units measured as a value of 2,544,662 THB in the past eight months. Pass the reliability test of these products and the ability of process control in the index Cpk> 1.67