 Like all Type XXI U-boats, "U-3519" had a displacement of when at the surface and while submerged.She had a total length of , a beam length of , and a draught length of .The submarine was powered by two MAN SE supercharged six-cylinder M6V40/46KBB diesel engines each providing , two Siemens-Schuckert GU365/30 double-acting electric motors each providing , and two Siemens-Schuckert silent running GV232/28 electric motors each providing .