Sensirion provides detailed information on both the package outline and the land pattern. In fact, it is recommended, because the IC pad pitch is just 0.5 mm, that only one solder mask opening should be used for all four pads on one side. It is also suggested, when using solder paste printing, that a laser-cut stainless steel stencil with trapezoidal walls and with a stencil thickness of 0.1 or 0.125 mm should be used. See the images below. This information should be quite helpful for a PCB layout design team.
Fixtures are more suited for the flexible circuit boards as well as the fragile and thin PCBs. However, each new board design requires its custom fixture which can take between three and four days for a manufacturer to produce and deliver. As such, using fixtures can add up the costs and time to produce the PCBs.
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