If its a Box Square its a coil , if its flat with 8 leggs its a driver if its rectangle its a Voltage regulator aka Mosfet the little squares with silver on the sides can be Fuses, Diods,Shunts,Filters.
https://www.ebay.com/itm/282815958305?mkevt=1&mkcid=1&mkrid=711-53200-19255-0&campid=5338679342&customid=282815958305_2&toolid=11000
here I helped design a few of these a year back.