The 139603-H1053 is a pulse transformer designed for LAN applications. It has a package size of 1.125" L x 0.480" W (28.58mm x 12.19mm) and is mounted using surface mount technology. The transformer has a maximum seated height of 0.230" (5.84mm) and a weight of 0.14 oz (3.99 g). With a standard package of 15 pcs, it is suitable for low volume production or prototyping. The operating temperature range is 0°C to 70°C, making it suitable for a variety of environments. Although this product is obsolete, it was widely used in the past for LAN applications. It has an ECCN classification of EAR99 and is unaffected by REACH regulations. Pulse, a reputable manufacturer, produced this pulse transformer.