A PCB engineer’s guide to Panasonic PCB materials โ MEGTRON, FELIOS & XPEDION series explained with specs tables, application comparisons, and selection tips.
If you’ve been designing high-speed, high-frequency boards long enough, you’ve probably hit a wall with standard FR-4. The signal integrity falls apart at anything above a few gigahertz, the transmission losses stack up, and suddenly your carefully modeled stackup doesn’t perform the way it should in the real world. That’s the moment most engineers start looking at premium laminate materials โ and Panasonic PCB materials almost always come up in that conversation.
Panasonic’s Electronics Materials Business Division has spent decades developing some of the most recognized substrate brands in the industry. Whether you’re working on a 5G base station antenna, an AI data center backplane, automotive radar, or a compact flex assembly for mobile devices, there’s very likely a Panasonic PCB material engineered for that exact application. This guide breaks down every major series โ MEGTRON, FELIOS, XPEDION, HIPER V, and halogen-free solutions โ so you can make a well-informed material selection before your next design spin.
Why Panasonic PCB Materials Stand Apart from Standard FR-4
Standard FR-4 is cheap, widely available, and easy to fabricate. For most general-purpose electronics, it’s perfectly adequate. But once your design pushes above 1 GHz โ particularly into the 5G mmWave, 77 GHz automotive radar, or 100G+ networking territory โ FR-4’s dielectric constant (Dk) and dissipation factor (Df) become a serious liability.
Panasonic PCB materials address this by using advanced resin systems like polyphenylene ether (PPE), liquid crystal polymer (LCP), and specialized hydrocarbon compounds. These deliver significantly lower Dk and Df values, reduced transmission loss at high frequencies, better thermal stability under lead-free soldering conditions, and in many cases, environmental compliance (RoHS, REACH, halogen-free).
The tradeoff is cost and process complexity โ but for applications where signal integrity is non-negotiable, the engineering case is clear. Let’s go through each series in detail.
Overview of the Panasonic PCB Material Portfolio
Before diving into individual series, here’s a high-level view of where each Panasonic PCB material family fits:
| Series | Type | Primary Use Case | Key Strength |
| MEGTRON | Rigid multilayer | High-speed networking, 5G, AI servers | Ultra-low transmission loss |
| XPEDION | Rigid multilayer | RF/wireless, automotive radar, 5G antennas | Low RF propagation loss |
| FELIOS | Flexible | Mobile devices, automotive flex, mmWave | Flexible, low moisture absorption |
| HIPER V | Rigid multilayer | Automotive electronics | High heat resistance, reliability |
| Halogen-Free | Rigid multilayer | Environmental compliance applications | RoHS/REACH compliant |
| ECOOL | Rigid | LED lighting boards | High thermal conductivity |
The MEGTRON Series: Setting the Standard for High-Speed Panasonic PCB Design
Among all Panasonic PCB materials, MEGTRON is the most widely referenced in high-speed digital design circles. Engineers working on 10G, 25G, 100G, 400G, and now 800G+ systems consistently specify MEGTRON as their go-to substrate. The reason is straightforward: no other commercially mainstream material offers a comparable combination of low loss, processability, and thermal reliability.
The entire MEGTRON lineup uses a PPE (polyphenylene ether) or hydrocarbon-blended resin system. Compared to standard epoxy (FR-4), PPE resin delivers a dramatically lower dielectric constant and loss tangent โ which is exactly what you need to maintain signal integrity over long backplane traces or dense multilayer stackups.
MEGTRON 2: Halogen-Free for General High-Speed Applications
MEGTRON 2 is the entry point of the MEGTRON family, designed for applications that need better-than-FR-4 performance but don’t require the extreme low-loss properties of MEGTRON 6 or 7. It’s halogen-free, lead-free compatible, and suitable for networking equipment including servers and routers, as well as automotive components and measuring instruments. Think of it as the “everyday workhorse” for engineers who need to step up from FR-4 without jumping straight into premium pricing.
MEGTRON 4: Large-Volume High-Speed Data Transmission
MEGTRON 4 (Laminate R-5725 / Prepreg R-5620) takes performance a step further with low transmission loss and high heat resistance specifically optimized for servers and routers handling large volumes of high-speed data. If you’re designing a mid-tier switching or storage platform where MEGTRON 6 might be over-specified, MEGTRON 4 is a practical middle ground worth evaluating.
MEGTRON 6: The Industry Reference for Signal Integrity Engineers
MEGTRON 6 (Laminate R-5775 / Prepreg R-5670) is arguably the most widely used advanced PCB laminate in the world for high-speed multilayer boards. It uses PPE resin as the matrix with high-frequency ultra-low profile copper foil (H-VLP), giving it transmission loss performance that approaches PTFE-based materials while being significantly easier and cheaper to process.
Here’s the critical practical advantage for fabricators: MEGTRON 6 processes very similarly to standard FR-4. It doesn’t require the plasma treatment that PTFE demands for through-hole plating, and solder mask processes are standard. For high-layer-count boards, this translates into meaningfully better yield and lower cost compared to PTFE alternatives.
MEGTRON 6 Key Electrical Properties:
| Property | Value | Condition |
| Dielectric Constant (Dk) | 3.34 | @1 GHz |
| Dissipation Factor (Df) | 0.002 | @1 GHz |
| Thermal Decomposition Temp (Tg) | 185ยฐC | โ |
| Z-axis CTE | 45 ppm/ยฐC | โ |
| Moisture Absorption | Low | Standard conditions |
| Lead-free Solder Compatibility | Yes | โ |
| Environmental Compliance | RoHS | โ |
The MEGTRON 6 family includes several sub-grades: MEGTRON 6(G), MEGTRON 6(K), and MEGTRON 6(N). The (N) variant uses low-dielectric-constant glass cloth, giving it further reduced Dk for the most demanding impedance-controlled designs, such as ultra-high-layer-count boards for mainframes and IC testers. MEGTRON 6 is the right pick for 10โ25 Gbps networking equipment, high-end servers and routers, switches, optical networks, high-frequency test instruments, and 5G base station hardware.
MEGTRON 7: Ultra-Low Loss for Supercomputers and High-End Infrastructure
MEGTRON 7 (R-5785) pushes the performance envelope further with the lowest propagation delay in the MEGTRON lineup. It’s designed for applications where MEGTRON 6 simply isn’t enough: supercomputers, high-end routers, enterprise-grade ICT infrastructure, and high-end antenna systems. MEGTRON 7 is also the first Panasonic PCB material to be qualified for use with the European Space Agency (ESA), a testament to the thermal and electrical reliability Panasonic has achieved with this material.
MEGTRON 8: Built for the 800G and AI Era
MEGTRON 8 (R-5795U) is Panasonic’s latest generation laminate, representing a significant leap forward from MEGTRON 6 and 7 platforms. It’s specifically engineered for next-generation high-speed communication network equipment โ the AI server clusters, 800G optical networking gear, probe cards, semiconductor test equipment, and optical transmission platforms that are defining the current electronics landscape.
MEGTRON Series Comparison at a Glance:
| Model | Laminate Grade | Key Target Application | Performance Level |
| MEGTRON 2 | โ | Automotive, general networking | Good |
| MEGTRON 4 | R-5725 | Servers, routers (mid-tier) | Better |
| MEGTRON 6 | R-5775 / R-5775(N) | 5G, AI, high-layer networking | Excellent |
| MEGTRON 7 | R-5785 | Supercomputers, ESA-qualified | Outstanding |
| MEGTRON 8 | R-5795U | 800G, AI data centers, test equip. | Best-in-class |
The XPEDION Series: Panasonic PCB for RF and Automotive Wireless Applications
While MEGTRON dominates the high-speed digital space, the XPEDION series targets a different challenge: low propagation loss in the radio frequency range. If you’re designing RF multilayer boards for 5G antennas, base station power amplifiers, automotive millimeter-wave radar (77 GHz), or ADAS sensor platforms, XPEDION is Panasonic’s answer.
XPEDION materials are optimized for large-capacity, high-speed transmission of high-frequency RF signals. They’re halogen-free and, critically, they support standard multilayer PCB processing โ an important advantage over PTFE substrates that require special handling.
XPEDION 1: The Benchmark for Low-RF-Loss Multilayer Boards
XPEDION 1 (R-5515X / R-5515) is halogen-free with ultra-low transmission loss in the RF range and an operating temperature ceiling of 200ยฐC. It’s the primary choice for automotive antenna systems, 5G base station antenna modules, and automotive millimeter-wave radar boards. XPEDION 1 directly reduces PCB process cost compared to PTFE materials while maintaining the RF performance needed for demanding wireless applications.
XPEDION T1: Adding Thermal Management to the RF Equation
XPEDION T1 (R-5575X / R-5575) adds a critical dimension that XPEDION 1 doesn’t prioritize: high thermal conductivity (0.60 W/mยทK). With a Tg of 245ยฐC (DMA), XPEDION T1 is engineered for power-intensive RF applications where heat management is as important as signal performance. Target applications include base station power amplifier boards, small cell systems, and automotive millimeter-wave radar antenna modules where both RF integrity and thermal dissipation are non-negotiable requirements.
XPEDION Series Comparison:
| Model | Grade | Dk (@10 GHz) | Df (@10 GHz) | Thermal Conductivity | Tg | Key Application |
| XPEDION 1 | R-5515X | ~3.3 | Very Low | Standard | 200ยฐC | 5G antenna, auto radar |
| XPEDION T1 | R-5575X | 3.6 | 0.005 | 0.60 W/mยทK | 245ยฐC | Power amplifier, small cell |
The FELIOS Series: Flexible Panasonic PCB Materials for Mobile and Automotive
The FELIOS series is where Panasonic PCB engineering addresses flexible circuit boards. This is a completely different design environment from rigid multilayer โ space constraints, dynamic bending, high-density interconnects, and increasingly, high-frequency performance in a flexible form factor. FELIOS materials are primarily aimed at mobile products and automotive flex applications, and they come in two distinct variants with very different engineering approaches.
FELIOS FRCC: Resin Coated Copper Foil for Thin, Dense Flex Boards
FELIOS FRCC is built around a resin-coated copper foil (RCC) construction โ a deliberate choice that simplifies the manufacturing process while enabling thinner, higher-density flexible PCBs. It’s halogen-free, and its core applications are HDI boards and smartphones, where reducing layer thickness and maintaining fine pitch are the design imperatives. FELIOS FRCC has a dielectric constant of 4.4 and is rated for signal frequencies up to 1 GHz, with a high Tg of 173ยฐC that provides good reliability under reflow conditions and elevated temperatures.
FELIOS LCP: Liquid Crystal Polymer for High-Frequency Flex Applications
FELIOS LCP is a more technically specialized material, built from specialty pure LCP (Liquid Crystal Polymer) film. LCP is increasingly important in modern electronics because it offers something that most flexible materials can’t: stable electrical properties across a very wide frequency range, combined with extremely low moisture absorption.
For a flex PCB engineer, moisture absorption is not just an environmental concern โ it directly affects Dk stability. Materials that absorb moisture shift their dielectric constant in unpredictable ways, which is catastrophic for impedance-controlled flex designs in millimeter-wave or high-frequency RF applications. LCP’s inherently low moisture absorption eliminates this problem.
FELIOS LCP Key Advantages:
- Ultra-low moisture absorption (inherent to LCP polymer structure)
- Stable Dk and Df over a wide frequency range
- High dimensional stability โ critical for fine-pitch manufacturing
- Halogen-free construction
- Suitable for 5G mmWave flexible antennas, automotive flex radar modules, and medical equipment
FELIOS Series Summary:
| Model | Construction | Dk | Tg | Moisture Absorption | Key Applications |
| FELIOS FRCC | Resin Coated Copper Foil | 4.4 | 173ยฐC | Low | HDI boards, smartphones |
| FELIOS LCP | Liquid Crystal Polymer film | Very low (stable) | High | Ultra-low | mmWave flex, auto radar flex, medical |
The HIPER V Series: Panasonic PCB for Automotive Electronics Reliability
HIPER V is Panasonic’s dedicated series for automotive multilayer circuit boards โ a market with its own unique set of requirements around thermal cycling, vibration resistance, long-term reliability, and AEC-Q grade compliance. Automotive electronics live in harsh environments far beyond the controlled conditions of a data center, and the substrate must perform reliably across temperature extremes, moisture exposure, and extended service lifetimes.
HIPER V materials offer higher heat resistance compared to standard automotive substrates and are designed to meet the demanding reliability standards that automotive Tier 1 suppliers and OEMs require. Applications span the full automotive electronics spectrum: powertrain control modules, ADAS processing boards, infotainment systems, and increasingly, the high-voltage power electronics in EV platforms.
Halogen-Free Panasonic PCB Materials: Environmental Compliance Without Performance Sacrifice
Environmental regulations have been tightening across the electronics industry for years. RoHS (Restriction of Hazardous Substances) and REACH directives, along with IPC and JPCA halogen-free standards (Cl โค 900 ppm, Br โค 900 ppm, Cl+Br โค 1500 ppm), have pushed material suppliers to develop alternatives to traditional brominated flame retardants.
Panasonic’s halogen-free lineup spans multiple series. MEGTRON 6 (R-5375) and FELIOS FRCC are leading examples of halogen-free Panasonic PCB materials that meet international environmental requirements without sacrificing the electrical and mechanical performance engineers depend on. These materials behave similarly to standard FR-4 in terms of processability while eliminating the toxic gas concerns associated with halogen-containing materials during manufacturing and in case of combustion.
It’s worth noting that most of the XPEDION and FELIOS series are halogen-free by design โ Panasonic has clearly made environmental compliance a built-in requirement rather than an afterthought in their newer material development.
How to Select the Right Panasonic PCB Material for Your Design
Material selection is one of the most consequential early decisions in any PCB design project. Getting it wrong costs money in respins, fabrication delays, and signal integrity debug sessions that could have been avoided. Here’s a practical framework for narrowing down your Panasonic PCB material choice:
Step 1: Define Your Frequency and Data Rate Requirements
This is the primary filter. Different operating frequency ranges point to different material families:
| Frequency / Data Rate | Recommended Panasonic PCB Material |
| Up to 1 GHz | FELIOS FRCC, Halogen-free standard series |
| 1โ10 GHz | MEGTRON 4, MEGTRON 6 |
| 10โ25 Gbps (digital) | MEGTRON 6, MEGTRON 6(N) |
| 25โ56 Gbps (digital) | MEGTRON 6, MEGTRON 7 |
| 56 Gbps+ / 800G+ | MEGTRON 8 |
| RF / mmWave (5G, 77GHz radar) | XPEDION 1, XPEDION T1, FELIOS LCP |
| Flex RF / Flex mmWave | FELIOS LCP |
| Automotive rigid | HIPER V |
Step 2: Assess Thermal Requirements
Do you need lead-free solder compatibility? High-temperature operation? Thermal management for power-intensive RF stages? Run through these questions:
- Lead-free assembly: All MEGTRON grades from MEGTRON 2 onward support lead-free soldering.
- High Tg for thermal cycling: MEGTRON 6 (Tg 185ยฐC), XPEDION T1 (Tg 245ยฐC), FELIOS FRCC (Tg 173ยฐC).
- High thermal conductivity: XPEDION T1 at 0.60 W/mยทK is the standout for heat dissipation.
Step 3: Consider the Form Factor
Rigid multilayer: MEGTRON, XPEDION, HIPER V, Halogen-free. Flexible: FELIOS FRCC or FELIOS LCP depending on frequency requirements. Rigid-flex: Discuss hybrid stackup options with your fabricator โ FELIOS can often be combined with MEGTRON cores in rigid-flex designs.
Step 4: Environmental and Regulatory Compliance
Check whether your end product must comply with RoHS, REACH, or specific automotive environmental directives. If halogen-free is mandatory, confirm with your fabricator that the specific Panasonic grade is certified accordingly. Most modern MEGTRON, XPEDION, and FELIOS grades are halogen-free, but always verify with the datasheet.
Step 5: Fabrication Costs and Availability
MEGTRON 6 is widely stocked globally and offers excellent processability vs. PTFE at competitive pricing for a premium laminate. MEGTRON 7, MEGTRON 8, and FELIOS LCP command a higher cost and may have longer lead times โ factor this into your procurement planning.
Panasonic PCB Materials vs. Competing High-Speed Substrates
Engineers evaluating Panasonic PCB materials often compare them against other premium substrates. Here’s a simplified comparison:
| Parameter | Panasonic MEGTRON 6 | Rogers RO4350B | PTFE (e.g., RT/Duroid) | Standard FR-4 |
| Dk (@10 GHz) | ~3.34 | ~3.48 | ~2.2 | ~4.3โ4.5 |
| Df (@10 GHz) | ~0.002 | ~0.0037 | ~0.0009 | ~0.02 |
| Processability | FR-4-like | FR-4-like | Requires special process | Standard |
| Lead-free Compatible | Yes | Yes | Limited | Yes |
| Halogen-Free | Yes | No (standard) | Depends on grade | No (standard) |
| Relative Cost | Medium-High | Medium-High | Very High | Low |
| Best For | High-speed digital, 5G | RF/microwave | High-RF performance | General purpose |
MEGTRON 6’s biggest competitive advantage isn’t raw Df performance (PTFE materials can go lower) โ it’s the combination of low loss AND standard multilayer processability, which is a manufacturing and cost advantage that matters enormously in production volumes.
Real-World Applications of Panasonic PCB Materials Across Industries
To ground the technical specs in practical context, here’s where you’ll encounter Panasonic PCB materials in actual end products:
Telecommunications & Data Infrastructure: MEGTRON 6, 7, and 8 are found in 5G base stations, high-end routers and switches from major networking OEMs, AI server backplanes, optical transport equipment, and 800G Ethernet line cards.
Automotive Electronics: HIPER V in powertrain and ADAS control modules; XPEDION 1 and T1 in 77 GHz millimeter-wave radar front-end boards; FELIOS LCP in automotive flex antennas; MEGTRON 2 in networking gateway modules inside connected vehicles.
Aerospace and Defense: MEGTRON 7 has achieved ESA qualification, opening the door for space-grade PCB applications. Panasonic continues space exposure experiments to validate material durability under extreme conditions.
Consumer Electronics and Mobile: FELIOS FRCC is embedded in smartphones for HDI flex layers; FELIOS LCP enables mmWave antenna integration in high-end handsets.
Industrial and Medical: MEGTRON 6 and halogen-free series appear in precision measurement equipment, IC testers, and medical diagnostic platforms where signal accuracy and reliability are critical.
Useful Resources for Panasonic PCB Material Selection
These official and industry-respected resources will help you go deeper into Panasonic PCB materials for your specific design needs:
| Resource | Description | Link |
| Panasonic Industrial โ Circuit Board Materials (Global) | Official product catalog with all series | industrial.panasonic.com |
| Panasonic Industrial North America โ MEGTRON Series | NA-specific MEGTRON product pages and distributor info | na.industrial.panasonic.com |
| Panasonic Europe โ Circuit Board Materials | EU product portal and datasheet downloads | industry.panasonic.eu |
| XPEDION Product Page (Official) | XPEDION 1 and T1 full specs and datasheets | industrial.panasonic.com/ww/products/pt/xpedion |
| Panasonic White Paper Portal | Technical papers on MEGTRON and other materials (registration required) | na.industrial.panasonic.com |
| Cirexx โ Panasonic PCB Materials Guide | Fabricator perspective on using Panasonic materials | cirexx.com/panasonic-materials |
| IPC-4101 Standard | Specification for Base Materials for Rigid and Multilayer Boards | ipc.org |
| JPCA-ES-01-2003 | Japanese standard for halogen-free PCB material classification | Referenced in Panasonic datasheets |
Frequently Asked Questions About Panasonic PCB Materials
Q1. What is the difference between MEGTRON 6 and MEGTRON 8?
MEGTRON 6 is the established industry standard for 10โ25 Gbps high-speed multilayer boards and remains the most widely available Panasonic PCB material in this performance class. MEGTRON 8 is Panasonic’s next-generation material, purpose-built for 56 Gbps+ and 800G+ applications like AI server backplanes, optical transmission equipment, and next-generation probe cards. MEGTRON 8 delivers substantially lower transmission loss and better thermal reliability than MEGTRON 6, but comes at higher cost and may have more limited fabricator availability today.
Q2. Can FELIOS LCP be used in rigid-flex PCB designs?
Yes, but the design and fabrication require careful engineering. FELIOS LCP is inherently a flexible material optimized for flex and flex-rigid applications. In a rigid-flex board, LCP-based flex layers can be integrated with rigid cores โ sometimes MEGTRON-family materials โ to create hybrid stackups. This approach is used in advanced automotive radar modules and high-frequency antenna-in-package designs. Work closely with your fabricator to validate the lamination process and bonding layer compatibility.
Q3. Is Panasonic MEGTRON 6 halogen-free?
Yes. The MEGTRON 6 R-5375 and related grades meet the IPC and JPCA halogen-free standards (Cl โค 900 ppm, Br โค 900 ppm). It also complies with RoHS and REACH environmental directives. Always verify the specific grade’s datasheet because different sub-variants of MEGTRON 6 may carry different certifications.
Q4. How does Panasonic XPEDION compare to Rogers RO4000 series for 5G antenna boards?
Both XPEDION and Rogers RO4000 are strong candidates for 5G antenna applications. XPEDION is engineered specifically for RF multilayer applications with an emphasis on processability within standard multilayer workflows. Rogers RO4350B is widely used and well-characterized for single and multilayer microwave boards. The key distinction is that XPEDION T1 offers higher thermal conductivity (0.60 W/mยทK), making it preferable for power amplifier boards where heat management is critical alongside RF performance. For millimeter-wave automotive radar (77 GHz), XPEDION 1 is a strong candidate given its validated performance at those frequencies and halogen-free composition.
Q5. Where can I download datasheets for Panasonic PCB materials?
The primary source for official Panasonic PCB material datasheets is the Panasonic Industrial global product portal at industrial.panasonic.com. Each product series page includes downloadable data sheets and application notes. For North American customers, the Panasonic White Paper Pagoda at na.industrial.panasonic.com requires free registration but provides access to detailed technical papers. Distributors like Panasonic-authorized PCB material partners can also supply sample quantities and tech support for design-in evaluation.
Final Thoughts: Choosing the Right Panasonic PCB Material for Your Next Design
The depth and breadth of the Panasonic PCB material portfolio is genuinely impressive from an engineering standpoint. There are very few applications in modern electronics โ from 800G AI backplanes to flexible mmWave radar modules โ that can’t be addressed by one of the series covered here.
The practical takeaway for design engineers is this: start with your frequency and data rate requirements, cross-reference with your thermal and mechanical constraints, check environmental compliance requirements for your target market, and then engage your PCB fabricator early. Not every fab has equal experience with every Panasonic PCB material โ particularly FELIOS LCP and MEGTRON 8 โ and that fab relationship matters as much as material selection for achieving the performance you’ve modeled.
MEGTRON 6 remains the “safe default” for most high-speed digital designs if you’re not sure where to start. If you need RF performance for 5G antennas or automotive radar, start with XPEDION 1 or T1. If flex is in the picture and frequency matters, FELIOS LCP is worth the evaluation effort. And if you’re pushing into the 800G era, it’s time to have a serious conversation about MEGTRON 8.
