TDK Corporation (TSE 6762) announces the introduction of the TDK-Lambda brand FQB series of 20A 40Vdc rated EMC filters. These filter modules provide protection for DC-DC converters against input voltage surges and spikes through the use of active circuitry. The FQB MIL-COTS series is designed for the harsh environments found in 28Vdc nominal input vehicle and airborne applications.

The filters have high differential and common mode noise attenuation, simplifying system level compliance to the MIL-STD-461(F, G) standard. The module’s surge and spike protection also assists qualification to MIL-STD-1275(D, E) and RTCA/DO-160G (Sec 16-18). Qualifying testing is consistent with MIL-STD-883F and MIL-STD-202G.

The FQB has an operating input voltage range of 8.5Vdc to 40Vdc, and can withstand transients of up to -50 to +210V. Additionally it provides reverse input, under/over voltage and over current protection. A remote on/off function and an open collector DC Good / Fault signal is fitted as standard. Vehicle battery drain is minimised by a no-load current consumption of typically 3mA, which is reduced to just 1.5mA when the remote on/off function is initiated. The total DC resistance of the filter is typically 30mO, further minimising power losses.

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