The 139986-H5007T is a pulse transformer designed for LAN 10/100/1000 Base-T applications. It has a package size of 0.690" L x 0.480" W (17.53mm x 12.20mm) and is mounted using surface mount technology. The transformer has a maximum seated height of 0.217" (5.51mm). With a standard package of 300 pcs, it is suitable for medium volume production. 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 Although this product is obsolete, it was widely used in the past for LAN applications.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.