Multilayer ceramic capacitor and board having the same mounted thereon

A multilayer ceramic capacitor, comprising:

• a ceramic body having a plurality of dielectric layers stacked therein;
• an active layer including pairs of first internal electrodes and pairs of second internal electrodes alternately disposed with each of the dielectric layers interposed therebetween, each pair of first internal electrodes having respective first lead portions extending to be alternately exposed to side surfaces of the ceramic body, and each pair of second internal electrodes having respective second lead portions extending to be alternately exposed to the side surfaces of the ceramic body in positions spaced apart from the first lead portions in a length direction of the ceramic body;
• upper and lower cover layers formed above and below the active layer, respectively;
• a first external electrode including a pair of first connecting portions disposed to oppose each other on the side surfaces of the ceramic body and be electrically connected to the first lead portions, and a pair of first mounting portions extending from lower ends of the pair of first connecting portions to portions of a lower surface of the ceramic body;
• a second external electrode including a pair of second connecting portions disposed to oppose each other on the side surfaces of the ceramic body in positions spaced apart from the pair of first connecting portions in the length direction of the ceramic body and be electrically connected to the second lead portions, and a pair of second mounting portions extending from lower ends of the pair of second connecting portions to portions of the lower surface of the ceramic body,
• wherein 0.75×W≦T≦1.25×W, 0.081≦b/(a×(W−b))≦2.267, and 0.267≦c/L≦0.940 are satisfied, where T denotes a thickness of the ceramic body, a denotes a thickness of the lower cover layer, b denotes a width of the first or second internal electrode, L denotes a length of the ceramic body, c denotes a distance between outer edges of the first and second external electrodes, and d denotes a distance between inner edges of the first and second external electrodes.