14-Layer High-Speed PCB – Panasonic Megtron 6 (M6) Impedance control Ultra-Low Loss Material with Via-in-Pad & IPC Class 3

Product Description

14-Layer High-Speed PCB – Panasonic Megtron 6 (M6) Ultra-Low Loss Material with Via-in-Pad & IPC Class 3

 

Q: What is this Megtron 6 PCB solution, and what does it deliver?

A: This is a 14-layer, high-performance PCB built with Panasonic Megtron 6 (M6) – an ultra-low loss, high-heat-resistant material based on a PPE (polyphenylene ether) resin system. With Dk = 3.4 and Df as low as 0.002 at 1 GHz, M6 delivers electrical performance approaching PTFE while remaining compatible with standard FR-4 fabrication processes .

 

 

The reference product is specified as:

• 14 layers, 2.123mm finished thickness
• 1 oz finished copper per layer
• Surface finish: ENEPIG (Electroless Nickel Electroless Palladium Immersion Gold)
• Green solder mask, white silkscreen, 100mm × 98mm panel
• Hole wall copper: 25µm – IPC-6012 Class 3
• All vias < 0.4mm: resin-plugged and capped (via-in-pad plated over)
• Impedance control and custom stack-up provided

 

 

This design is ideal for high-speed networking, data center switches, AI accelerators, and telecom infrastructure – where signal integrity, thermal reliability, and dense routing are critical .

 

 

Key Takeaways

#	Key Highlight	Description
①	Ultra-Low Loss Material	Megtron 6 delivers Dk = 3.4 and Df = 0.002 at 1 GHz (0.004 at 12 GHz) – approaching PTFE performance with FR-4 process compatibility .
②	High Thermal Reliability	Tg (DSC) = 185°C, Tg (DMA) = 210°C, Td = 410°C, and T288 > 120 min – fully compatible with lead-free assembly and harsh environments .
③	Via-in-Pad Ready	All vias < 0.4mm are resin-plugged and capped (plated over) – enabling dense BGA breakout and eliminating soldering issues.
④	IPC Class 3 Compliance	25µm hole wall copper and full IPC-6012 Class 3 qualification – meeting the highest reliability standards for aerospace, defense, and telecom.
⑤	ENEPIG Surface Finish	ENEPIG provides excellent solderability, wire-bonding capability, and corrosion resistance – ideal for fine-pitch components and long-term reliability.
⑥	Proven Manufacturing Platform	Megtron 6 is widely adopted in 56G PAM4 and 112G PAM4 applications, with excellent CAF resistance, low moisture absorption (0.0014%), and stable dimensional stability .

 

 

1. Material Overview – Megtron 6 (Panasonic)

Megtron 6 (M6) is an ultra-low loss, high-heat-resistant circuit board material from Panasonic, based on a polyphenylene ether (PPE) resin blend system. It is specifically engineered for high-speed digital, RF, and millimeter-wave applications where signal integrity and thermal reliability are paramount .

 

Key Material Characteristics

Feature	Benefit
Ultra-Low Dk (3.4)	Reduces signal propagation delay and crosstalk – critical for high-speed serial links.
Ultra-Low Df (0.002 at 1 GHz)	Minimizes insertion loss – enabling 56G PAM4 and 112G PAM4 channel compliance .
Stable Dk/Df over frequency	Ensures consistent impedance across wide bandwidth (1 GHz to 12 GHz+) .
FR-4 process compatibility	No special pre-treatment (unlike PTFE) – uses standard FR-4 fabrication lines .
Low Z-axis CTE (45 ppm/°C)	Reduces plated through-hole stress during thermal cycling .
H-VLP (High-Very Low Profile) copper compatible	Optimized for ultra-low transmission loss with reverse-treated foil .
Low moisture absorption (0.0014%)	Maintains electrical stability in humid environments .
Lead-free reflow compatible	Withstands multiple 260°C reflow cycles without delamination .

 

 

2. Material Datasheet – Consolidated Properties (Megtron 6)

Property Category	Property	Test Condition	Typical Value	Unit
Thermal	Tg (DSC)	–	185	°C
	Tg (DMA)	–	210	°C
	Td (Thermal Decomposition)	–	410	°C
	T288 (Without Cu)	–	> 120	min
	T288 (With Cu)	–	> 120	min
	CTE-X	IPC-TM-650 2.4.24	14–16	ppm/°C
	CTE-Y	IPC-TM-650 2.4.24	14–16	ppm/°C
	CTE-Z	IPC-TM-650 2.4.24	45	ppm/°C
	CTE α2 (Z-axis)	IPC-TM-650 2.4.24; Condition A	260	ppm/°C
	Thermal Conductivity	–	0.42	W/m·K
	Flammability	UL94	94V-0	Rating
Electrical	Dielectric Constant (Dk) @ 1 GHz	IPC-TM-650; C-24/23/50	3.4	–
	Dielectric Constant (Dk) @ 12 GHz	Balanced Circular Disk Resonator	3.4	–
	Dissipation Factor (Df) @ 1 GHz	IPC-TM-650; C-24/23/50	0.002	–
	Dissipation Factor (Df) @ 12 GHz	Balanced Circular Disk Resonator	0.004	–
	Volume Resistivity	–	1 × 10⁹	MΩ·cm
	Surface Resistivity	–	1 × 10⁸	MΩ
Mechanical	Poisson's Ratio	–	0.2	–
	Flexural Warp (MD)	–	19	GPa
	Flexural Fill (TD)	–	18	GPa
	Peel Strength (1 oz Cu, H-VLP foil)	–	0.8	kN/m
Physical	Water Absorption	–	0.0014	%

 

Note: Megtron 6 achieves Dk ≈ 3.4 and Df ≈ 0.002 at 1 GHz, making it one of the lowest-loss modified epoxy materials available. The Df increases to ≈0.004 at 12 GHz, still significantly lower than standard FR-4 (≈0.015–0.020) .

 

 

3. Custom PCB – 14-Layer Megtron 6 with Via-in-Pad & IPC Class 3

This 14-layer board demonstrates our capability to handle high-layer-count, high-reliability designs using Megtron 6 as the base material, with IPC-6012 Class 3 compliance and advanced via-in-pad technology.

 

Basic Specifications

Item	Specification
Layer Count	14 layers
Base Material	Panasonic Megtron 6 (R-5775/R-5670 series)
Finished Board Thickness	2.123 mm
Finished Copper per Layer	1 oz (all layers)
Surface Finish	ENEPIG (Electroless Nickel Electroless Palladium Immersion Gold)
Solder Mask	Green – top and bottom sides
Silkscreen	White – top and bottom sides
Panel Size	100 mm × 98 mm (1 piece)

 

 

 

Advanced Process Features

Feature	Detail	Benefit
Via-in-Pad (VIP)	All vias < 0.4mm: resin-plugged + plated over	Enables component placement directly on vias – essential for fine-pitch BGAs
Resin Plugging	Vias filled with resin and surface planarized	Provides flat surface for capping; prevents solder wicking
Capped Vias	Electroplated copper over filled vias	Electrically connects via to pad; ensures reliability in thermal cycling
ENEPIG Finish	Electroless Nickel + Palladium + Immersion Gold	Excellent solderability, wire-bonding capability, and corrosion resistance – ideal for fine-pitch and long-term reliability
25µm Hole Wall Copper	IPC-6012 Class 3 requirement	Ensures robust PTH reliability in harsh environments
Impedance Control	TDR testing per layer	Ensures signal integrity across all high-speed interfaces

 

 

Stack-Up Design

 

The 14-layer stack-up can be optimized for:

• High-speed signal layers – differential pairs (85Ω, 90Ω, 100Ω) on outer and inner layers
• Power and ground planes – low-impedance power distribution
• Mixed-signal isolation – separating analog/RF and digital domains
• Impedance targets – 50Ω single-ended, 85Ω/90Ω/100Ω differential, per your requirements

 

Note: Impedance values are calculated based on the specific stack-up, dielectric thickness, and reference plane assignments. Final values are verified by TDR testing on finished boards.

 

 

4. Why Megtron 6 for This Design?

Requirement	How Megtron 6 Addresses It
High-speed serial links (56G/112G PAM4)	Ultra-low Df (0.002 at 1 GHz) minimizes insertion loss – critical for channel compliance .
Multiple impedance zones	Stable Dk (3.4) across 1–12 GHz enables consistent impedance control .
Dense BGA routing	Via-in-pad support (resin plug + cap) allows breakout from fine-pitch BGAs with <0.4mm pitch.
Lead-free assembly	High Tg (185°C DSC, 210°C DMA) and Td (410°C) withstand multiple 260°C reflow cycles .
IPC Class 3 reliability	25µm hole wall copper and robust material properties meet the highest reliability standards.
Environmental exposure	Extremely low moisture absorption (0.0014%) ensures long-term electrical stability .
Through-hole reliability	Low Z-axis CTE (45 ppm/°C) reduces PTH cracking risk .
Manufacturing availability	Megtron 6 is widely stocked and supported by major PCB fabs .

 

 

Comparison Table – Megtron 6 vs. Standard FR-4 vs. High-End RF Materials

Parameter	Megtron 6 (M6)	Standard FR-4 (High-Tg)	PTFE-Based Laminate (e.g., Rogers)
Dk (@ 1 GHz)	~3.4	~4.5–5.0	~2.9–3.2
Df (@ 1 GHz)	~0.002	~0.015–0.020	~0.0015–0.0025
Df (@ 10–12 GHz)	~0.004	–	~0.0015–0.0030
Tg (DSC)	185°C	~170–180°C	~180–240°C (varies)
Td (TGA)	410°C	~340°C	~400°C+
Z-axis CTE	45 ppm/°C	~50–70 ppm/°C	~40–60 ppm/°C
Moisture Absorption	0.00%	~0.3–0.5%	<0.1%
FR-4 Process Compatibility	Yes	Yes	Limited (special handling)
Relative Cost (vs. FR-4)	2–3×	1×	4–6×
Primary Application	56G/112G digital, 5G sub-6, networking	General digital	RF/mmWave front-end

 

 

Q1: What makes Megtron 6 different from standard FR-4?

A: Megtron 6 offers significantly lower Dk (3.4 vs. ~4.5–5.0) and Df (0.002 vs. ~0.015–0.020) , improved Z-axis CTE, and extremely low moisture absorption (0.0014%) – all while remaining compatible with standard FR-4 fabrication processes. It is the industry workhorse for 56G and 112G PAM4 designs .

 

 

Q2: Is Megtron 6 compatible with lead-free soldering?
A: Yes. With Tg (DSC) = 185°C, Tg (DMA) = 210°C, Td = 410°C, and T288 > 120 minutes, Megtron 6 fully supports multiple 260°C peak reflow cycles without delamination or degradation .

 

 

Q3: Can all vias be resin-plugged and capped (via-in-pad)?
A: Yes. Our manufacturing process supports resin plugging + electroplated capping for all vias < 0.4mm. This is standard for this 14-layer design and enables component placement directly over vias.

 

 

Q4: What is IPC-6012 Class 3, and why is it important?
A: IPC-6012 Class 3 is the highest reliability class for rigid printed boards, requiring 25µm minimum hole wall copper, stringent inspection criteria, and proven thermal/mechanical reliability. It is required for aerospace, defense, medical, and high-reliability telecom applications.

 

 

Q5: What is ENEPIG, and why choose it?
A: ENEPIG (Electroless Nickel Electroless Palladium Immersion Gold) adds a palladium layer between nickel and gold. This provides: (1) Excellent solderability, (2) Wire-bonding capability, (3) Superior corrosion resistance, and (4) RoHS compliance. It is ideal for fine-pitch components and long-term reliability.

 

 

Q6: How do you ensure impedance control accuracy?
A: We use: (1) Precise material Dk values from Panasonic, (2) Controlled laminate thickness and copper weights, (3) Impedance modeling with industry-standard field solvers, and (4) TDR (Time-Domain Reflectometry) testing on coupon or finished boards.

 

 

Q7: What is the minimum via diameter for resin plugging and capping?
A: We support resin plugging and capping for vias down to 0.15mm (6 mil). For this 14-layer design, all vias < 0.4mm are resin-plugged and capped as specified.

 

 

 

Contact Us

As a specialized PCB supplier based in China, we have extensive experience with Panasonic Megtron 6 (M6) , high-layer-count (up to 20+ layers) , and complex HDI features (via-in-pad, blind vias, resin plugging) .

 

We provide:

Full material traceability (certificates from Panasonic)

IPC-6012 Class 3 qualification with 25µm hole wall copper

Impedance testing (TDR) with detailed reports

X-ray and cross-section inspection for via quality

Electrical testing (flying probe / fixture)

Quick-turn prototypes and volume production

 

For technical inquiries, stack-up review, or quotation requests, please contact our sales team directly. We are ready to support your high-speed digital, telecom, and data center projects.