Part Number:REF1933
Dear,
我们最近检测了REF1933AIDDCT,三个批次DC:2136/ DC:2207/ DC:2247,检测了一共四片样品,可焊性测试的成功率都在95%以下,其中2207的覆盖面是84% &93.75%,DC2247的覆盖面93%,DC2136的覆盖面只有70%。请问这个是正常的吗?
还有DC2207的一片电流测试也没通过,Low Vref output Vref =3.29329V / Low Vbias output Vbias =1.64672V , 这种不良率也是正常的吗?
感恩您的回复~
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We test 4 pieces, moved 4 pieces to test the output Vref and Vbias voltage.
Found 3 pieces passed that the Vref was within 3.2967V to 3.3033V and the Vbias was within 1.64835V to
1.65165V, but 1 piece failed that the Vref was less than 3.2967V and the Vbias was less than 1.64835V.
Parts Passed XRF, Failed Solderability test.
Johnsin Tao:
Hi
能有照片吗? 我不清楚你焊接的情况。
2207的这块芯片是输出电压偏低吗?
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?? ?:
Hi Tao,
2207的芯片是输出电压偏低,请问这是正常的吗?
另外,我有焊接的图片,但是我研究了半天附件不上来,可以留下你的邮箱吗,我发邮件给你,谢谢!
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Johnsin Tao:
Hi
偏低不正常,首先确认负载是否过大,以及输出电压是否稳定?
图片通过下面的“插入”贴上来即可。