CU4S0508/CU4S0509 Isolators & Circulators TDK CU4S0508 and CU4S0509 Isolators and Circulators feature clockwise and counter-clockwise circulation. The modules offer 9dB and 10dB minimum isolation, 1dB to 1.30dB maximum insertion loss, and 2W or 5W maximum handling power. A variety of frequency ranges is available: 3300MHz to 3600MHz, 3400MHz to 3600MHz, 3400MHz to 3800MHz, 3500MHz to 3700MHz, 3500MHz to 3800MHz, 3600MHz to 3800MHz, and 3800MHz to 4000MHz. TDK CU4S0508/CU4S0509 Isolators and Circulators have an operating and storage temperature range of -40°C to +105°C.