B7221xM SIOV Metal Oxide Varistors TDK B72210M and B72214M SIOV Metal Oxide Varistors are suitable for Surface Mount Device (SMD) assembly and are available in vertical and horizontal versions. The horizontal version of the B72210M series has dimensions of 22mm x 15mm x 11mm, while the B72214M series has dimensions of 27mm x 18mm x 11mm. The vertical types have dimensions of 15mm x 10mm x 220mm and 18mm x 10mm x 25.5mm, respectively. These dimensions result in a space-saving design with excellent performance.