SWRB1207S-2R2NT SWRB1207S-330MT SWRB1207S-330MT 电感器 / 磁珠 SWRB1207S-331MT SWRB1207S-390MT SWRB1207S-391MT SWRB1207S-3R3NT SWRB1207S-3R9NT SWRB1207S-470MT SWRB1207S-471MT