FQA-FQB Series MIL-COTS EMC Filters

TDK Corporation's FQA and FQB Series of EMC Filters from TDK-Lambda features a rating of 40 V_DC at 20 A. Voltage surge and spike protection for DC/DC converters on FQB models is accomplished through the use of active technology. The series 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 FQA and FQB series are designed with a high differential and common mode noise attenuation, simplifying system level compliance to the MIL-STD-461 (F, G) standard. The FQB modules provide input spike and surge protection per MIL-STD-1275 (D, E) and RTCA/DO-160G (sec. 16-18) in addition to EMI suppression. Qualifying testing is consistent with MIL-STD-883F and MIL-STD-202G.

The fully-featured FQB operating input voltage is 8.5 V<><> (start-up) to 40 V_DC and the filters can withstand transients of up to -50  V to +210 V. Reverse polarity and overcurrent 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 filters can be cooled using either an industry-standard quarter-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 60.6 mm x 55.9 mm x 12.7 mm. The total DC resistance of the FQA filter is typically 12.5 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.

Features

• Filtering for compliance to MIL-STD-461 (F, G)
• Input spike and surge suppression per MIL-STD-1275 (D, E), MIL-STD-704 (A-F) and RTCA/DO-160G (sec. 16-18)
• High differential and common mode noise attenuation
• -55°C to +115°C temperature range (M-grade)
• Standard (S-grade) or enhanced screening (M-grade) options
• Quarter-brick size
• Suitable for use with TDK-Lambda's HQA series