Shengyi S7040G PCB Fabrication
Halogen-free mid-loss with Dk 3.72 at 10 GHz and Df 0.0089 for 25G-56G server interconnects, switches, and 5G backplanes
3.72
Dk @ 10 GHz
0.0089
Df @ 10 GHz
175C
Tg (DSC)
405C
Td
Key Features
- True mid-loss: Dk 3.72, Df 0.0089 at 10 GHz between FR-4 and ultra-low-loss
- Halogen-free and lead-free compatible with V-0 rating
- Outstanding Td 405C for extreme thermal reliability
- Anti-CAF for dense via arrays in backplane designs
- Proven for 25G-56G NRZ/PAM4 channels in production
Applications
Shengyi S7040G is proven in production for: data center switches/routers (25G-56G), server backplanes, 5G base station digital backhaul, high-speed line cards, AI server interconnects.
How It Compares
S7040G fills the gap between standard FR-4 (Df 0.018) and ultra-low-loss S7439 (Df 0.0013) or Megtron 6 (Df 0.002). At Df 0.0089, it handles 25G-56G channels up to 12 inches. Costs 30-40% less than Isola I-Tera MT40.
Design Parameters
| Property | Value |
|---|---|
| Glass Transition (Tg) | 175/185C |
| Decomposition Temperature (Td) | 405C |
| T260 | >60 min |
| T288 | >60 min |
| CTE Z-axis (before Tg) | 45 ppm/C |
| CTE Z-axis (after Tg) | 245 ppm/C |
| CTE Z-axis (50-260C) | 2.5% |
| Dk | 3.9 (1G) / 3.72 (10G) |
| Df | 0.007 (1G) / 0.0089 (10G) |
| Peel Strength (after 288C) | 0.85 N/mm |
| Flammability | UL 94 V-0 (HF) |
| IPC Specification | - |
Shengyi S7040G In Production
Genuine S7040G high-speed boards we fabricate, and the 25G-56G systems they go into.
Dense BGA breakout on S7040G — Df 0.0089 at 10 GHz keeps 25G-56G NRZ/PAM4 channels clean under a switch ASIC.
Plated-via detail: S7040G is anti-CAF with Td 405C, holding up to dense via arrays in high-layer-count backplanes.
Data center switches and routers: S7040G is the halogen-free mid-loss workhorse for 25G-56G line cards and backplanes.
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