The TDK-Lambda FQB series of EMC filters have a rating of 40 Vdc at 20 A. Voltage surge and spike protection for dc-dc converters is accomplished through the use of active technology. The FQB has a rugged encapsulated quarter-brick package with a choice of flanged or non-flanged baseplates. These modules are suitable for use in a wide variety of harsh and demanding environments, including MIL-COTS vehicle and airborne applications.
The FQB series is designed with a high differential and common 
mode noise attenuation, simplifying system level compliance to the MIL-STD-461(F, G) standard. The modules also provide input spike and surge protection per 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 operating input voltage is 8.5 (start-up) to 40 Vdc and the filters can withstand transients of up to -50 to +210 V. Reverse polarity and over current protection is also provided. The filter modules have a remote on-off function and an open collector DC Good / Fault signal. No-load input current is typically 3 mA but reduces to 1.5 mA when the remote on/off function is initiated.
The PCB mount FQB can be cooled using either an industry standard ¼ brick heatsink, or conduction cooled via a cold plate. The non-flanged package size measures 60.6x39x12.7 mm (LxWxH) and the flanged version 60.6×55.9×12.7 mm. The total dc resistance of the filter is typically 30 mΩ, minimizing power losses.
The filters are available with standard production screening (-S suffix) and a baseplate temperature rating of -40 to +115°C, or with enhanced screening (-M suffix) and an extended temperature rating of -55 to +115°C. Enhanced screening includes functional testing at high and low temperatures and a 96 hour burn-in period with temperature cycling.
All models have been safety certified to UL 60950-1, CAN/CSA C22.2 No. 60950-1-07 and IEC 60950-1, IEC/UL/CSA 62368-1 (pending) and carry the CE mark.
More information can be obtained on the TDK-Lambda Americas website https://www.us.tdk-lambda.com/lp/products/fq-series.htm, or by calling 800-LAMBDA-4. Product availability for all the FQB filters can be found via the link to TDK-Lambda’s distributor network (see “Check Distributor Stock to Buy”) at https://www.us.tdk-lambda.com/lp/.
