Megtron PCB
Megtron 6 & Megtron 7 PCB
Low-Loss for High-Speed. No MOQ.
When insertion loss decides your link budget, the laminate is the design. We build Panasonic Megtron 6 and Megtron 7 — verified material, mixed-dielectric stackups, and controlled impedance on the pairs that matter — for 56G/112G SerDes and AI-server boards.
Megtron 6 vs Megtron 7 vs Megtron 8
Published Panasonic Megtron dielectric properties. Higher grade = lower loss = higher data rate.
| Grade | Dk | Df | Best For |
|---|---|---|---|
| Megtron 6 (R-5775) | ~3.4 | 0.004 @ 10 GHz | 28–56 Gbps PAM4, high-speed digital, sub-8-inch 112G channels. |
| Megtron 7 (R-5785) | ~3.3 | 0.002 @ 28 GHz | 56–112 Gbps SerDes, AI-server backplanes, long high-speed channels. |
| Megtron 8 | ~3.2 | ~0.0015 @ 28 GHz | Next-gen 112G+ and 224G roadmaps where every dB of loss counts. |
Values are representative of Panasonic published datasheets at the noted frequencies; exact figures depend on glass style, resin content and copper profile. We confirm the datasheet build for your stackup.
Mixed-Dielectric Stackups Save 55–65%
On a 20–30 layer AI accelerator board, only a handful of layers carry the critical 112G high-speed pairs. Building the whole board from Megtron 7 is unnecessary and expensive.
We place Megtron 7 only on the high-speed SerDes layers and use high-Tg FR-4 (IT-180A / Megtron 4) on power, ground and low-speed layers — a qualified combination that cuts the material bill sharply while holding channel performance where it matters.
ULL on Signal Layers Only
Megtron 7 on 4–8 critical SerDes layers; standard high-Tg elsewhere.
Lower Material Bill
ULL usage cut 55–65% vs full-Megtron build.
Qualified Combinations
Megtron 6/7 + IT-180A qualified in production up to 30 layers.
FAQ
Megtron PCB Questions
What is Megtron PCB material?
A family of low-loss / ultra-low-loss laminates from Panasonic for high-speed digital and RF. Megtron 6 (Df ~0.004 @10GHz) for 28–56 Gbps; Megtron 7 (Df ~0.002 @28GHz, T-Glass) for 56–112 Gbps SerDes and AI-server boards.
Megtron 6 vs Megtron 7?
Megtron 6 for 56G under ~8 inches and cost-sensitive high-speed; Megtron 7 for 112G and long channels where insertion loss dominates. Mixed-dielectric stackups get you Megtron 7 performance on critical layers only.
Can you build mixed-dielectric Megtron stackups?
Yes — Megtron 6/7 on high-speed signal layers with high-Tg FR-4 on the rest, qualified up to 30 layers with controlled impedance on the low-loss pairs.
Is Megtron good for RF as well as digital?
Megtron’s low Df helps both. For dedicated RF/microwave (antennas, mmWave) a Rogers laminate is often the better fit — see our Rogers and high-frequency pages, or ask us to compare for your band.
Related materials: Isola 370HR (high-Tg FR-4), Rogers RF laminates, and the high-frequency PCB service.
Need Megtron 6 or 7 fabrication?
Low-loss laminate, mixed-dielectric stackups, verified material. Get an instant quote.