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CD40106B: 输出波形异常,原因可能是什么?

Part Number: CD40106B

使用过程中,驱动板上的的该芯片CD40106BM96出现异常(其中测试输出四路输出,三路正常,有一路输出不正常。导致驱动板缺相报故障。输出波形往下掉),我们也搞不清楚原因,故请教以下问题:
(1)CD40106BM96 替代CD40106BMT,仅仅只是包装区别?可以完全替代?
(2)哪些方式可能导致此种波形异常?麻烦给予指导意见。