what is this component and the brand name ? P527 DGM
It is a TVS diode from the Chinese company BrightKing.  It appears to be a clone of the Littlefuse SMDJ64CA.  The picture below shows a clip from the SMDJ page on the BrightKing website.  Note the matching logo on the part.



Here is a link to the BrightKing SMDJ datasheet.

Below are clips from the datasheets showing the specs for the parts. LittleFuse is in green followed by BrightKing in red.  Note the package marking code DGM for the bidirectional part.  For small parts, manufacturers often use marking codes, since the full part number does not fit.