The 77F221J-TR-RC is a conformal coated RF choke inductor from Bourns' 77F Series, designed for DC/DC converters, power supplies, and general RF filtering applications. This component features a 220 µH inductance with ±5% tolerance, a DC resistance of 5.0 O maximum, and a rated DC current of 155 mA. The inductor exhibits a self-resonant frequency of 2.8 MHz and a quality factor of 60 at its test frequency of 0.796 MHz, providing excellent performance in high-frequency filtering circuits. With an operating temperature range of -55°C to +105°C, ferrite core construction, and RoHS-compliant epoxy resin conformal coating, this component is well-suited for demanding power management and signal conditioning applications requiring reliable inductance and minimal EMI.