Does reflow profiles refer to air or pcb temperature?

[linux-dude]

Hi,

I've done quite a few boards in my reflow convection oven (with my own controller). Now I'm doing some more advanced boards with BGA's (0.8mm, 484 pads), and wonder about the reflow temperature profiles; do they refer to air temperature or to the actual PCB temperature?

Thanks,
Mike

 

[schmitt trigger]

Hi,

I've done quite a few boards in my reflow convection oven (with my own controller). Now I'm doing some more advanced boards with BGA's (0.8mm, 484 pads), and wonder about the reflow temperature profiles; do they refer to air temperature or to the actual PCB temperature?

Thanks,
Mike

Air temperature, and that is if you provided that you have some means of circulating the air, otherwise temperature gradients will develop.

 

[linux-dude]

Air temperature, and that is if you provided that you have some means of circulating the air, otherwise temperature gradients will develop.

Thanks, good to know I've done the right thing in the past as well.

 

[marce]

You need to measure the temperature of the PCB as well that's where the correct temperatures are critical, each board will require its own profile... It is the board surface where the solder is, its here that you need to control the temperature!!!