KK Flight Controller what is this part on the board

[7808]

what is the burnt part on this board? it was from reversing polarity on the voltage input , i would like to replace it if its cheap and easy to get maybe from digikey

https://lh5.googleusercontent.com/-...AAAABsc/jmxQZdZ8JJU/w536-h715-no/CAM01698.jpg

 

[vtaildriver]

Looks like it could be a diode. Try to compare it with the D3 part in the same location by the other pins.