Help! 2sk389 soic packaged

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Hello, I bought for a good price a soic-a packaged 2sk389 (or sold as so) here:

http://www.kalcic.it/default.asp?id_categoria=539|540|546&ricerca=&testoricerca=&risultati_max=&paginacorrente=38&equi=&marca=

In the chip I can read:"K389BL 4u".
I think it's not the Linear System LSK389.
Well, I cannot find this soic-packaged datasheet in internet :(
You can search anywhere: nothing.

Please, help me to find the SOIC datasheet or the pin assignment (or a way to discover it without killing the fet).

Thank you
 
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