The 77F331J-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. It features an inductance of 330 µH with ±5% tolerance, a DC resistance of 6.5 O maximum, and a self-resonant frequency of 2.4 MHz. The device is rated for a maximum DC current of 137 mA and operates across a temperature range of -55°C to +105°C, with a quality factor (Q) of 60 at the test frequency. The conformal epoxy resin coating provides environmental protection, while the ferrite core and polyester copper wire construction ensure reliable performance in demanding applications requiring RF filtering and EMI suppression.