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ULQ2003A-Q1: The difference between ULQ2003ATDRG4Q1 and ULQ2003ATDRQ1.

Part Number: ULQ2003A-Q1

Hi all

I have some questions about the complete material number of ULQ2003A-Q1. What is the difference between ULQ2003ATDRG4Q1 and ULQ2003ATDRQ1?As shown in the table below:

 The weight difference between the two is also very large. Please point out the difference, thank you.