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Component Identification

Discussion in 'Datasheets, Manuals and Component Identification' started by H2814D, Nov 7, 2018.

  1. H2814D


    Nov 4, 2017
    Hello again everyone. I am trying to identify a component on a circuit board. I do not have and cannot find the schematic to assist, but if you can give me a reasonable probability by looking at the component, that would help. They are small. 2.7mmx1.3mm. They have three legs and are on a dual voltage controller board for a power supply. There are several of the same components on the board. Most of them have 2x and then another x that looks like it is on its side, or 2T and then a sideways U.

    Thanks in advance.


    [Mod Note: Resized huge image]
    Last edited by a moderator: Nov 8, 2018
  2. H2814D


    Nov 4, 2017
    Well I just found my answer. A 2x on a SMD component signifies a SOT-23 NPN transistor. A 2T is a PNP transistor with the same package. Well anyway...hopefully this will help someone else.
    davenn likes this.
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    In SOT-23, 2x could mean devices including KST4401, MMBT4401, SO4401, or TMPT4401.

    All are non silicon transistors rated at 60V and 600mA.

    Likewise 2T, if it is a transistor is a similar variety of 40V 600mA silicon pnp transistors with the numeric part of their part number being 4403
  4. H2814D


    Nov 4, 2017
    Thank you, *steve*. Because I had questions about SMD components, I started looking for information covering the topic. I found this link to what appears to be very useful information covering just that. I hope it is all right to post it here. If not, let me know and I will delete (if I can) the link.

    After taking a look at a group of components on a board I have photos of, I do notice not all of the components are listed in the document. I am not finding a bunch of them, actually. GB5, GB6, LM393, DAP8C, etc. There must be another more comprehensive resource out there somewhere.
    Last edited: Nov 9, 2018
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