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LM51551-Q1: Part Number Numenclature

Part Number: LM51551-Q1
Other Parts Discussed in Thread: LM51551


Can you tell me what the first Q signifies (beginning of the suffix) in this part number  LM51551QDSSTQ1?   I understand the second Q1 refers to the automotive grade.   Is this pin and functionally compatible with the LM51551DSST and LM51551DSSR?

Thank you,


  • Hi HSG,

    First, these parts are pin compatible.  Just note that the non-Q grade device package does not have the wettable flanks. 

    In the orderable part numbers, according to our project manager, the first Q means Grade 1.  The second Q1 indicates the automotive catalog. 

    Hope this clarifies.