BGA Connectivity issue

[viperpaki007]

Hi,

I used 196pin 0.4mm pitch BGA on my four layer PCB with the following layer stack



Now after the BGA assembly on PCBs the BGA pins show no connectivity. Manufactures say that the PCBs are bending while they heat the PCB for BGA soldering. Can anybody suggest what should be the recommended temperature of soldering this BGA package and are the materials used in PCB as prepreg and core are compatible with this heating temperature. I other words i need to know the temperature ratings of RO4350B and RO4403 PCB materials and also the recommended soldering temperature for 196pin BGA package. I would like to compare these values in order to make sure that my material selection for PCBs was right or not?

regards

 

[marce]

Data sheet for BGA...
What speed is the board running at, does it really need fancy dielectric, if not a high temp FR4 would do.
Finally the assemblers should be able to recommend a profile.

 

[PCB Designers]

I have experience of Soldering some BGA Packages....... some were Xilinx FPGA and some were Analog Devices' Compression Chips.... Every time we followed the Datasheet of the BGA Pakage and the result was OK....

Soldering Profile from Manufacturer is best to set your temperature zone ranges and timings.

Regards,
Maqbool

Hi,

I used 196pin 0.4mm pitch BGA on my four layer PCB with the following layer stack

View attachment 91108

Now after the BGA assembly on PCBs the BGA pins show no connectivity. Manufactures say that the PCBs are bending while they heat the PCB for BGA soldering. Can anybody suggest what should be the recommended temperature of soldering this BGA package and are the materials used in PCB as prepreg and core are compatible with this heating temperature. I other words i need to know the temperature ratings of RO4350B and RO4403 PCB materials and also the recommended soldering temperature for 196pin BGA package. I would like to compare these values in order to make sure that my material selection for PCBs was right or not?

regards