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MSP430FR2476: 器件丝印问题

Part Number: MSP430FR2476

你好!

TI MSP430FR2476TPTR器件,一个整包装1000片,外包装的D/C是一个。里面器件的丝印的第一行是430FR2476,第二行部分器件丝印显示是2CTG4,部分器件丝印显示是2BTG4,想了解下这一行丝印代表的是什么意义,为什么同一包装内的器件这个还有不同的丝印显示?