The HPI1250-1R0 part is a ferroelectric core made by Hewlett-Packard. It is a thin-film deposited high-performance ferroelectric core designed to provide performance, reliability and temperature stability. The HPI1250-1R0 is suitable for use in high-speed digital circuits, and has ratings at 85°C, 105°C, 125°C and 150°C. It has a resistance of 1 ohm, an inductance of 0.1mH, a capacitance of 1250pF, and an insulation resistance of 5000M ohms. This ferroelectric core is suitable for a wide range of applications and can be used in high-frequency signal processing, and high-speed switching.