The Feryster EFD15-K-10P-4S-SMD is a surface-mount, high-frequency transformer designed to be used in a wide range of applications. It has a toroid core form factor with a pitch of 10mm. The part is constructed of high ferrite material and has four pin terminals. It has a low profile, allowing it to be used in tight spaces. It also has a wide temperature range of -40ºC to +85ºC and is UL approved, making it ideal for a variety of commercial and residential applications.