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EMC Filters, EMI Filters & Accessories

AC-DC Power Supplies


20A, 40Vdc Demanding Environment EMC Filters

The FQA filter modules reduce differential and common mode conducted emissions from dc-dc switching converters. The series takes advantage of TDK technologies to simplify system level compliance to MILSTD-461. The FQB filter modules reduce conducted emissions from dc-dc switching converters, and in addition, contains active suppression circuitry to block input voltage surges and transients. The FQB series simplifies system level compliance to MIL-STD-461, MIL-STD-1275, RTCA/DO-160 and MIL-STD-704 per MIL-HDBK-704-8. The encapsulated rugged package design and a choice of baseplate options make the FQA and FQB modules suitable for use in a wide variety of harsh and demanding environments.



  • 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 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


Product Range Information

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Part number Additional Information Status Stock Level View PDF datasheet
FQA020ADC 20A 40Vdc input Current product Enquire View PDF datasheet
FQB020ADC 20A 40Vdc input Current product Enquire View PDF datasheet
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FQA, FQB MIL-COTS 20A, 40Vdc EMC Filters

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FQA and FQB In the TDK-Lambda Newsroom

20A 40Vdc filters use active circuitry to protect DC-DC converters against input voltage surges and spikes
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20A 40Vdc EMI filters simplify compliance in demanding environments
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Further Resources