EMI Input Filter Modules

Active EMI filter modules

The QPI family of active EMI filters provides conducted common-mode (CM) and differential-mode (DM) attenuation from 150kHz to 30MHz (CISPR22 range). The proprietary active-filtering circuit provides superior attenuation at low frequencies intended to support EN Class B limits, including PICMG 3.0 for ATCA boards. In comparison to passive solutions, the use of active filtering reduces the volume of the common-mode choke, providing a low-profile, surface-mount device. Smaller size saves valuable board real estate and the reduced height enhances airflow in blade applications. The MQPI-18 attenuates conducted common-mode (CM) and differential-mode (DM) noise for 28V input MIL PRMs to comply with MIL-STD-461F EMI requirements for conducted noise measurements. The filter operates within the full input operating range of a 28V MIL PRM and supports 7A loads up to 85°C (TA) without de-rating.

Part Number Input Current Test Freq. CM Attenuation HIPot Package
QPI-21LZ-01 30 – 80 14 250 45 1,500 Open Frame
QPI-21LZ 30 – 80 14 250 45 1,500 LGA
QPI-12LZ-01 5.0 – 80 7 1,000 40 1,500 Open Frame
QPI-12LZ 5.0 – 80 7 1,000 40 1,500 LGA
QPI-11LZ-01 5.0 – 50 7 1,000 60 707 Open Frame
QPI-11LZ 5.0 – 50 7 1,000 60 707 LGA
QPI-6LZ-01 30 – 80 14 250 40 1,500 Open Frame
QPI-6LZ 30 – 80 14 250 40 1,500 LGA
QPI-5LZ-01 10 – 40 14 250 60 707 Open Frame
QPI-5LZ 10 – 40 14 250 60 707 LGA
QPI-3LZ-01 10 – 40 7 250 65 707 Open Frame
QPI-3LZ 10 – 40 7 250 65 707 LGA
MQPI-18LP-01 5.0 – 50 7 1,000 45 1,500 Open Frame
MQPI-18LP 5.0 – 50 7 1,000 45 1,500 LGA