US Patent 7417301 Semiconductor component with coreless transformer

The invention relates to a semiconductor component having a coreless first transformer (71, 72) which comprises a first (71) and a second (72) planar winding, is arranged on a semiconductor body 9 and is surrounded in the lateral direction by a protective ring (1, 2). The protective ring (1, 2) has metal portions (1a-1d), of which the top metal portion (1a) is further apart of the first planar winding (71) in the lateral direction than the protective ring (1b) which is second from top.