The lead-free PCB evolution

IPC chartered the D-35 Printed Board Storage and Handling Subcommittee to create a new standard, IPC-1601 'Printed Board Handling and Storage Guidelines', to address the problem of moisture absorption in lead-free printed circuit boards (PCB). The group is aimed for packaging and handling such that PCBs are adequately protected from exposure to moisture from fabrication through assembly. It is required that the packaging provide a minimum level of protection during transit, as shipping providers have no reliable temperature or humidity control. Concerns regarding the moisture content of PCBs after fabrication and prior to shipment are addressed by specifying the maximum moisture level a PCB before packaging and shipment. The IPC is also reviewing the moisture barrier effectiveness of packaging and utilizing desiccant to absorb moisture in PCB packaging.