Quectel EG91 Series Hardware Design page 95

LTE Standard Module Series
Pin 1
Figure 43: EG91-AUX/-EX/-NA/-NAL/-NAX/-NAXD/-NAXDL/-VX Bottom Dimensions (Top View)
NOTE
The package warpage level of the module conforms to JEITA ED-7306 standard.
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EG91_Series_Hardware_Design