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关于运放的产地标

Other Parts Discussed in Thread: LME49720

关于运放产地,ti的标识到底是个什么标准?我发现像5532和5534这些好像背面都没有标识,稍微高级一些的有的有有的没。那这些没有产地表示能查到产地么?比如lme49720,背面标着0E20。