The STF28-461 from Crane Aerospace & Electronics is a space-qualified RF filter engineered to suppress electromagnetic interference in power conversion systems operating in orbital environments. Designed for extreme reliability, this radiation-hardened EMI filter supports operating frequencies of up to 500 kHz with a minimum attenuation of 50 dB, ensuring effective reduction of conducted noise in spaceborne power architectures. This passive RF filter operates at voltages of up to 50 V and supports a throughput current of up to 0.8 A. 

The design relies exclusively on passive components to maximize tolerance to radiation, thermal stress and long-duration space exposure. The filter is specifically engineered to reduce the SMSA power line reflected ripple current to meet the limits defined by MIL-STD-461C CE-03 requirements. The STF28-461 is fully qualified for space operation and is guaranteed to withstand a total ionizing dose (TID) of 1000 krad(Si) in accordance with MIL-STD-883, with Radiation Hardness Assurance (RHA) level H. 

This qualification ensures stable electrical performance under harsh radiation conditions encountered in Earth orbit and beyond. Compact and mechanically robust, the filter is housed in a package measuring 24.89 × 20.45 × 6.86 mm. It is ideally suited for use with SMSA flyback power converters and other space power conditioning systems requiring reliable EMI suppression and compliance with stringent aerospace standards.