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WL1837MOD: Difference between the WL1837MOD PNs ending with 'B' and 'I'

Part Number: WL1837MOD
Other Parts Discussed in Thread: WL1835MOD


We see mentioning the the part numbers as WL18MODGB and WL18MODGI in the ETSI/CE section of WL1837MOD data sheet. 

What is the difference between the PNs ending with 'B' and 'I'? Also We don't see any WL1837MOD orderable part number ending with B. So is the PN ending with B valid?

Thomas CN