PCB assembler requirements
In this chapter are described the files, documents and informations that are to be provided by PCB assembler. In case the
PCB assembler would be in charge of PCB purchasing, it is its responsibility to check that all PCB manufacturer
requirements hereabove are fully satisfied.
PCB storage conditions
Status: MANDATORY
Applicable standard: IPC/JEDEC J-STD-033
Specific standard:
Before assembly, MSL level has to be stored in the MSL follow-up chart. Process temperature has to be between 20°C and
25°C with a maximum humidity level between 30% and 80%.
MSL level follow-up table, partial reconditioning - Time to soldering
Status: MANDATORY
Applicable standard: IPC/JEDEC J-STD-033
Specific standard:
PCB must not be soldered after 12 month from the manufacturing date for HAL tin, NiAu or silver finished surfaces.
PCB must not be soldered after 6 month from the manufacturing date for chemical tin or OSP finished surfaces.
PCB from opened packages has to be soldered within 24 hours of opening. After soldering, PCB has to be packaged again
in sealed airtight packaging with traceablity marking (labels, codebar).
Every re-packaging must be identified (Date and time) and MSL informations are to store in a dedicated chart. A new MSL
marker has to be used every time the PCB are stored after a partial production batch. Remaining PCB panel must be sealed
again in airtight packaging after assembly with new labels and MSL indicators.
Maximum solder reflow cycle must not exceed 3 times.
No oven storage is allowed for PCB temporary storage.