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CSD23280F3: Question about YJM footprint

Part Number: CSD23280F3

Hi,

I want to use a CSD23280F3 in our new product but in my opinion something is weird about the reommended footprint in the datasheet (page 9) :

Images intégrées 1

As we can see on the second figure the stencil is open over a surface where part of it is covered by the solder mask, so according to this figure there will be solder paste on the solder mask during the production, and I don't understand what is the purpose of this.

Could you please explain to me why this is done this way, or tell me if I didn't understand these figures ?

Best regards,

Guillaume