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TPS54332: 为什么有些TI的标签上面没有盖章?TPS54332DDAR & LM2676SX-5.0/NOPB

Part Number: TPS54332

为什么现在22+的一些货,会发现上面没有彩色的盖章?这是正常现象吗?急急急,在线等。希望可以尽快解答。