Gowanda’s SMRF1210S-391J is a high-quality molded shielded inductor designed for reliable performance in electronic applications. Weighing just 0.05 grams and measuring 3 × 2.16 × 2.06 mm, this component is part of the SMRF1210S series and is suitable for surface mount technology (SMT). It is crafted for COTS+ application grade, offering an inductance of 3.9 µH with a direct current resistance (DCR) of 0.83 Ω and a current rating of 0.441 A DC. The inductor operates effectively within a frequency range, with a self-resonant frequency (SRF) of 42 MHz and a test frequency of 7.9 MHz, maintaining a minimum Q factor of 40. It features a tolerance of ±5% and uses a lead-based termination type with a Sn63Pb37 finish. Constructed with a ferrite core, it is not shielded but is designed to operate in temperatures ranging from -55°C to +125°C. With a moisture sensitivity level (MSL) of 1, it is packaged in tape and reel (T&R) format and is fungal inert, ensuring durability and reliability in various environments.