20-A, 40-VDC MIL-COTS EMC filters provide voltage surge and spike protection

Oct. 10, 2019

2 min read

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TDK Corp. has announced the introduction of the TDK-Lambda FQB Series EMC filters, with 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 variety of harsh and demanding environments, including MIL-COTS vehicle and airborne applications.

The FQB Series is designed with 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 60.6 mm x 39 mm x 12.7 mm (L x W x H), and the flanged version measures 60.6 mm x 55.9 mm x 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°C to +115°C, or with enhanced screening (-M suffix) and an extended temperature rating of -55°C 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.

website https://www.us.tdk-lambda.com/lp/products/fq-series.htm