Bondability of copper wires on PPF leadframe

Leadframes' AuAg plating thickness influences to stitch bonding of palladium coated copper wires

“…It is believed that thicker AuAg layer provided higher cushioning effect during PCC wire bonding thus reduced wire deformation at heel. A thicker but softer AuAg layer made the PCC wire more bondable with the hard Ni-plated Cu lead frame [15]. Fig.…”