The 139630-H1086T is a pulse transformer designed for LAN 10/100 Base-T applications. It is a surface mountable transformer with a size of 1.000" L x 0.390" W (25.40mm x 9.91mm). The transformer has a height of 0.245" (6.22mm) when seated. It comes in a tape and reel package with a standard package of 300 pieces. The 139630-H1086T is an obsolete product, but it was widely used in the past for its excellent performance in LAN applications. Despite being obsolete, it is still sought after in certain markets due to its unique specifications and reliability. The transformer is manufactured by Pulse, a trusted brand known for its high-quality electronic components.