This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Why the new&original parts of LM5050MK-2/NOPB have below nonconformities？ Pics attached.
DC:2101+5 COO:MALAYSIA
1.The parts look sande and have a layer of additional paint
2.The markings failed the acetone test
Hi
你是要查这个芯片的marking吗? 可以在网站上查: https://www.ti.com.cn/packaging/cn/docs/partlookup.tsp#divline
你是哪里买的?
Hi Johnsin,
Thanks for your replying.
I was asking why the surface failed the acetone test? We bought them from authorized distributor.
The marking of this part is "SZJB", no matter what D/C, LOT, COO is.
HI
不太清楚你们的acetone测试，从图片看，是否异常就是看不清上面的marking。
这类芯片因为很小，只有简单的marking在芯片上，其他如D/C之类都是在包装上的。
就是想知道，原装芯片的表面marking和黑色部分可以用丙酮试剂擦除是否正常的？因为我们偶尔从其他渠道买货，QC会用这种方法来检验是否原装。但是这批货是从正规代理出来的，为什么也会有这种现象？
我不太清楚名称，我以前公司用的叫做“洗板水”， 是可以的。
不建议从其他渠道，而且marking伪造太容易，不建议作为检验规则。（现在TI都去掉授权代理商了，而市场上假货劣质产品还是很多的）
