The 139638-H1102T is a pulse transformer designed for LAN 10/100 Base-T applications. It is a surface mount transformer with a size of 0.500" L x 0.280" W (12.70mm x 7.11mm). With a maximum seated height of 0.235" (5.97mm), this transformer provides reliable performance in a compact package. It operates in a temperature range of 0°C to 70°C, making it suitable for a wide range of applications. Manufactured by Pulse, the 139638-H1102T comes in tape & reel packaging with a standard package of 600 pieces. Although this product is currently obsolete, it was widely used in networking equipment for data transmission. Its compact size and high performance made it a popular choice among manufacturers.