Minimum and maximum thickness requirements for each metallic layer. Performance criteria for solderability and wire bonding.
Many people search for "ipc-4556 pdf" because they are deciding between surface finishes. Here is how ENIG (per 4556) compares:
Compliant ENEPIG boards can easily be stored for over 12 months without losing their solderability.
Minimum and maximum thickness requirements for each metallic layer. Performance criteria for solderability and wire bonding.
Many people search for "ipc-4556 pdf" because they are deciding between surface finishes. Here is how ENIG (per 4556) compares:
Compliant ENEPIG boards can easily be stored for over 12 months without losing their solderability.