HCP High Current Pi Filters for EMI and EMC Suppression

What Makes HCP High Current Pi Filters Different?

The central difference is filtering strength in a compact high-current package.

HCP filters use a Pi-style C-L-C architecture to deliver higher insertion loss than simpler C, L, LC, or standard C-type feedthrough designs, making them a strong fit for applications that require lower-frequency EMI/RFI attenuation without adding significant space or weight.

Additional HCP180 Series technical advantages include:

• 180A high current Pi filter design
• Maximum filtering at minimum frequency, from 1kHz to greater than 1GHz
• Increased insertion loss above 1MHz
• High capacitance options up to 22µF
• Compact, lightweight construction
• Operating temperature from -55°C to +125°C
• O-ring bulkhead seal and bolt-style electrode attachment
• CDR and JAN reliability levels available

Applications for HCP High Current Pi Filters

HCP high current Pi filters are used in medical, military, aerospace, industrial, telecom, wireless, and mobile power systems where strong EMI/RFI suppression must be balanced with limited installation space and demanding operating conditions.

Common applications include:

• Medical equipment and imaging systems
• Military, government, and homeland security systems
• Rocket and missile launch systems
• Aerospace and aviation power filtering
• Industrial laser systems
• Telecom, wireless, and cellular RF supply filtering
• Rugged mobile electronics

When to Choose a Pi Filter Instead of a Standard C-Type Feedthrough Filter

A Pi filter may be the right choice when the application requires more attenuation than a standard C-type feedthrough filter of comparable capacitance can provide.

By using a C-L-C circuit, HCP Series Pi filters support higher insertion loss and stronger lower-frequency suppression in a compact high-current package. This makes them useful for systems with more demanding conducted noise requirements, especially where available installation space is limited.

HCP High Current Pi Filter Recommended Products

NexTek offers HCP180 Series filters across multiple capacitance, tolerance, and voltage configurations to support demanding 180A high-current Pi filtering requirements.

• 0.10µF configuration: HCP1801004Z10
• 0.22µF configuration: HCP1802204Z10
• 0.47µF configuration: HCP1804704Z10
• 22µF high-capacitance configuration: HCP1802206M10

All listed configurations are 180A, 100VDC high current Pi filters. Because insertion loss varies by configuration, capacitance is the clearest way to compare these models.

Review the appropriate datasheet or contact NexTek to confirm the right specifications and series configuration for your application.

Related Information on HCP Pi Filters

• HCP180 Series Datasheet (PDF): Review HCP180 voltage and capacitance options, insertion loss curves, mechanical specifications, mounting guidance, torque recommendations, and part-number configuration details.
• EMC/EMI Filters Catalog (PDF): Explore NexTek EMI/EMC filter product families, custom filter capabilities, testing services, typical applications, and quality and manufacturing standards.
• Pi Filter Datasheets Now Available: Learn more about NexTek C-L-C Pi filter designs, including standard Pi filter configurations and options with integrated transient suppression.
• Using C-Type and Pi-Type EMI Filters for MIL-STD-461, CS116 Compliance: Review how C-type and Pi filters can support MIL-STD-461 CS116 transient requirements on power lines when integrated into an overall EMI/transient-compliant design.
• Are Compact Form Factors Important when Selecting an EMI Filter?: Review why compact form factor can be an important consideration when selecting EMI/RFI filters for space-constrained systems.

FAQs

What is a Pi Filter?

A Pi filter is a capacitor-inductor-capacitor, or C-L-C, filter that uses two capacitive stages with an inductor between them. The internal circuit layout resembles the Greek letter pi, which gives the filter its name.

What is the difference between a Pi filter and a C-type or LC filter?

A C-type filter uses a single shunt capacitance stage, while an LC filter typically uses one capacitor and one inductor. A Pi filter adds another capacitive stage, helping provide higher insertion loss and stronger filtering performance in applications that require more attenuation.

What frequencies do Pi filters suppress?

HCP180 Pi filters provide EMI filtering from 1kHz to greater than 1GHz. Actual insertion loss depends on the selected configuration, capacitance value, and application conditions.

Are Pi filters suitable for military and aerospace applications?

Yes. HCP180 Series filters are used in commercial, military, and space applications, including rocket and missile launch systems, radar, and communication systems. HCP180 filters are available with CDR and JAN reliability levels, and E-Series configurations can support programs with MIL-C-49467, MIL-C-55681, MIL-C-123, or customer SCD requirements.

Can HCP filters be customized?

Yes. NexTek can design, engineer, and manufacture custom EMI filters to suit specific application requirements, including frequency range, current rating, voltage rating, capacitance, operating temperature, mounting configuration, and applicable test or compliance needs.

If a standard HCP180 configuration does not fully align with your system, contact NexTek to discuss modified or custom options.