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芯片丝印为 “BBA6Z2M 2902KAQ”或者是“8BA6Z2M 2902KAQ”是什么型号？
丝印为2902KAQ的器件型号为LM2902这款运放， 请参考查询丝印链接：
www.ti.com/.../partlookup.tsp
