Maker Pro

Nexperia PCMFxUSB3BA Series EMI Filters with ESD Protection

January 15, 2020 by Sam Holland

Produced by leading semiconductor manufacturer, Nexperia, the PCMFxUSB3BA is a common mode EMI Filter that provides integrated bidirectional electrostatic discharge (ESD) protection for differential channels.

Integrated with the widest differential passband in the industry, up to 10 GHz with 3dB frequency, and very high surge robustness of up to 7.5 A 8/20 µs, Nexperia claims its PCMFxUSB3BA provides the best combination of choke/ESD protection common filter available on the market. 



The EMI design limits both single-ended noise and common mode noise. Consequently, this reduces the signal integrity’s impact on extremely fast data lines. Differential high-speeds are provided with low insertion loss on each channel, and there is attenuation of unwanted common-mode signals. Coupled by integrated coils, two signal lines are present in each differential channel. 


Nexperia PCMFxUSB3BA series EMI filters.

Nexperia PCMFxUSB3BA series EMI filters. Image credit: Nexperia.


Specifications and Features

The following are some of the major features and specifications of the PCMFxUSB3BA series EMI filters:

Differential channels: The PCMFxUSB3BA EMI filters consist of three differential channels for common-mode EMI filtering and electrostatic discharge (ESD) protection.

Voltage: According to the International Electrotechnical Commission (IEC 61000-4-2), PCMFxUSB3BA EMI filters can achieve ESD protection of up to ±15 kV contact discharge. 

Suppression: These EMI filters can achieve common-mode EMI suppression over a wide range of frequencies.

RF performance: Compared to other discrete and integrated filters, PCMFxUSB3BA series EMI filters achieve greater RF performance provided with external ESD protection. 

Symmetry: These filters are designed to have extremely high symmetry between the line pairs. 

Packaging: PCMFxUSB3BA series EMI filters are packaged in industry-standard wafer-level chip-scale packages. 



Some viable applications for PCMFxUSB3BA series EMI filters include:

  • Line pairs: These filters can be used to effectively filter 1, 2 and 3 line pairs i.e. Tx +/-, Rx +/-, and D +/-. 

  • USB protection: EMI protection in USB 2.0/USB 3.2 and HDMI 1.4/HDMI 2.0.

  • Communication line protection: They are effectively proven for communication line protection of up to 10 Gb/s which is adequate for sensitive system on chip (SoC) applications. Compared to discrete designs, these filters can significantly lower EMI reflections. 

  • Consumer electronics: They are widely used in cordless phones and cellular smart phones. They are also suitable for use in mobile internet devices (MIDs), tablets, and personal computers (PCs). 

  • Interface protection: The PCMFxUSB3BA series EMI filters can be utilised in “camera serial interface” and “display serial interface.” 

  • Industrial/Manufacturing: Suitable for use in several applications within the manufacturing industry such as consumer electronics and digital devices. 


Therefore, it can be seen that  PCMFxUSB3BA series of EMI filters from Nexperia with superior RF performance and with ESD protection as compared to already available filters is a great addition for engineers. Known for giving effective communication line protection, PCMFxUSB3BA series of EMI filters are widely used in consumer electronics. The manufacturer states that this series of filters are best in the electronics market with the combination of a choke/ESD protection common filter.

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