IPC-4556-AM1 is the amendment 1 to the standard IPC-4556 and made the following changes to the base specification: a) It added the absolute value of the maximum thickness for the immersion gold of 0.070 μm [2.8 μin] that accompanies the statistically valid minimum immersion gold thickness; b) It added two more photomicrograph images to provide better information on identifying nickel hyper...
IPC-4554, "Specification for Immersion Tin Plating for Printed Circuit Boards," is the third document in a series of specifications [the first two are: IPC-4552 which addresses electroless nickel/immersion gold (ENIG) and IPC-4553 which addresses immersion silver (IAg)] that set the requirements for printed circuit board surface finishes that are alternates to eutectic tin-lead. IPC-4554, a full...
Specification for Electroless Nickel/Immersion Gold (ENIG) Plating for Printed Circuit Boards Amendment 1 to IPC-4552 replaces the Table 3-1 Requirements of Electroless Nickel Immersion Gold Plating plus also replaces all of sections 3.2.1 Immersion Nickel Thickness and 3.2.2 Immersion Gold Thickness in the original release of the IPC-4552. The Amendment 1 permits the use of thinner gold (≥4 µm...
Specification for Electroless Nickel/Immersion Gold (ENIG) Plating for Printed Circuit Boards Amendment 2 to IPC-4552 is a new section in the original release of the IPC-4552. The Amendment 2 provides the “rules” by which any rework and/or repair of a printed board's ENIG surface finish is allowed. Effective September 2012.
IPC-9121 AM1 is an amendment to IPC-9121 which provides updates to the Hole Preparation/Protection and Interconnect Formation sections, covering troubleshooting topics and guidance on nonconductive plugging paste, microvias and pattern plating rim voids. IPC-9121 AM1 also includes a new section on Flexible Circuits.
The IPC-1791-Am1 provides revisions and clarifications for requirements pertaining to CAGE Code, citizenship, security, foreign person access, traceability records and NIST SP 800-171 compliance.