Ipc4556 Pdf -

The defining core component of ENEPIG. This layer actively curtails nickel diffusion and buffers the nickel against chemical attacks during subsequent gold deposition.

: Supports gold (Au), aluminum (Al), and copper (Cu) wire bonds. ipc4556 pdf

IPC-4556 explicitly states that layer thickness must be measured using methodology. Through extensive testing during the development of the specification, the IPC established a detailed set of measurement criteria, including equipment setup, measurement protocols, and calibration advice. The defining core component of ENEPIG

The standard is essential reading for:

The document is copyrighted by (Association Connecting Electronics Industries). You cannot legally download the full PDF for free from their website. You can purchase the official PDF here: including equipment setup