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I have some case with finding part number of smd chip. But I don't see any information about them.I have checked on s-manuals. Please help me identify them.

  1. -HA SOT-25 it's voltage detector or current sense.

-HA SOT-25

  1. !43NX SOT-23. I think it's mosfet or transistor but I'm not sure

enter image description here

These component from AC-DC convert board. I don't see label or brand on this board. Customer sent and asked checking component.

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  • \$\begingroup\$ Do you know any more about what the 43NX part does? Please don't answer here in the comment section. Add the information to your question. I will delete this comment later (if I remember) => I think it's mosfer or transistor. I saw exclamation mark (!) on 2N7002 On Semiconductors brand. But can't see information about 43N or 43NX \$\endgroup\$
    – Khoa Dang
    Commented Jun 15, 2021 at 3:47

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The HA is probably a TC7SH14F.

Not sure about the !43NX. It may be a TL431 if it is connected closely to an optoisolator. A photo showing the surrounding components would help.

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  • \$\begingroup\$ Dear Sir, Thank you very much. I have checked HA code but I don't see the hyphen before HA from original package. Is it depended on date code ? Not sure about the !43NX. It may be a TL431 if it is connected closely to an optoisolator. A photo showing the surrounding components would help => I will upload again. \$\endgroup\$
    – Khoa Dang
    Commented Jun 17, 2021 at 16:59

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