Shengyi S7439
Dk 3.0 | Df 0.0013 @ 10 GHz — world's #2 CCL manufacturer delivering Megtron 7-class performance at the industry's most competitive pricing.
3.0
Dk @ 10 GHz
0.0013
Df @ 10 GHz
210 C
Tg
#2
Global CCL
What is Shengyi S7439?
Shengyi Technology (SYTECH) is the world's second-largest copper-clad laminate manufacturer, and S7439 is their flagship ultra-low-loss product targeting 112G+ high-speed digital applications. At Df 0.0013, it matches Megtron 7 and TU-872 SLK performance while leveraging Shengyi's massive manufacturing scale for the most aggressive pricing in the ultra-low-loss category.
The S7439 has been rapidly adopted by Chinese hyperscale operators (Alibaba, Tencent, ByteDance) and their ODM partners for AI infrastructure builds where material volume runs into tens of thousands of panels per month. At this scale, even small per-panel savings compound into significant infrastructure cost advantages.
Shengyi's domestic Chinese production provides additional advantages for builds manufactured in China: zero import duties, minimal logistics cost, and 1-2 week lead times from factory to PCB fabricator. For the majority of global PCB production (which occurs in China), S7439 offers the simplest supply chain path.
Megtron 7-Class Df
0.0013 at 10 GHz matches premium Japanese laminates.
Most Competitive Cost
World's #2 CCL scale enables industry-lowest pricing for ultra-low-loss.
Hyperscale Adopted
Production-deployed by major Chinese cloud AI infrastructure.
Fastest Supply in China
Domestic production means 1-2 week lead times to Chinese fabs.
Shengyi S7439 Key Properties
Representative values from the manufacturer datasheet.
| Property | Value | Why it matters |
|---|---|---|
| Dielectric constant (Dk) | 3.0 @ 10 GHz | Low Dk for minimum signal delay. |
| Dissipation factor (Df) | 0.0013 @ 10 GHz | Top-tier loss matching Megtron 7 performance. |
| Glass transition (Tg) | 210 C | High reliability for dense multilayer builds. |
| Decomposition temp (Td) | 380 C | Excellent thermal margin. |
| CTE z-axis | ~32 ppm/C | Among the lowest in class for thick-board reliability. |
| Flammability | UL 94 V-0 | Full commercial compliance. |
| Reinforcement | Spread glass / ultra-low-loss | Low skew construction for PAM4. |
| Manufacturing scale | World #2 CCL | Massive capacity ensures consistent supply. |
| RTF compatibility | Optimized | Engineered for HVLP copper foil bonding. |
Scale Economics: Why S7439 Wins on Cost
Shengyi produces over 100 million square meters of CCL annually across multiple factory complexes. This scale enables raw material procurement advantages, manufacturing efficiency, and amortization of R&D costs across enormous production volumes — resulting in ultra-low-loss laminate pricing that smaller manufacturers cannot match.
For a 24-layer AI server backplane consuming 4-6 sheets of ultra-low-loss laminate per panel, S7439 saves $30-80 per board compared to Megtron 7. Chinese hyperscale operators building 10,000+ servers per deployment translate this into $300K-800K material savings per build cycle.
The technical performance is not compromised for cost. Independent lab testing confirms S7439 insertion loss within 3% of Megtron 7 on identical 30cm differential test vehicles at 28 GHz — well within the measurement uncertainty that makes the materials functionally interchangeable for channel design purposes.
Volume Pricing
Scale manufacturing enables 30-40% below Megtron 7 at volume.
AI Infrastructure Proven
Deployed in production AI clusters by top-3 Chinese cloud operators.
Functionally Equivalent
Within 3% insertion loss of Megtron 7 on identical test vehicles.
Chinese Domestic Supply
Zero import duty, minimum logistics for China-manufactured PCBs.
Ultra-Low-Loss Cost-Performance Comparison
S7439 in context against competing ultra-low-loss laminates.
| Material | Dk | Df | Best For |
|---|---|---|---|
| Shengyi S7439This page | 3.0 | 0.0013 | Lowest cost ultra-low-loss — Chinese hyperscale standard. |
| TUC TU-872 SLK | 3.0 | 0.0013 | Taiwan source — 20-30% below Megtron 7, excellent quality. |
| Panasonic Megtron 7 | 3.0 | 0.0012 | Japanese premium — widest qual base, highest cost. |
| ITEQ IT-968SE | 3.16 | 0.0015 | Taiwan mid-premium — good availability, slightly higher Df. |
| Ventec tec-speed 20.0 | 3.0 | 0.0017 | European source — EU OEM preferred, higher Df. |
Shengyi S7439 Applications
112G+ data center switches, AI training servers, cost-optimized high-speed digital at scale
AI Training Clusters
GPU interconnect for large-language-model training infrastructure.
Data Center Switches
800G and 1.6T top-of-rack and spine switch backplanes.
High-Performance Computing
Exascale node interconnects for national computing programs.
Optical Module Hosts
800G OSFP and QSFP-DD electrical host interfaces.
Storage Systems
NVMe-oF and CXL fabric boards for AI storage arrays.
5G Core
Baseband processing for 5G SA core network equipment.
S7439 Design and Procurement Notes
S7439 uses the same design rules as Megtron 6/7. Existing stackups designed for Megtron can migrate to S7439 with minimal impedance adjustment (typically under 3% trace width change due to slight Dk differences in specific glass styles).
For builds manufactured in China (majority of global PCB production), S7439 offers the simplest logistics: domestic laminate ships directly to fabricator with zero customs, zero import duty, and 1-2 week replenishment cycles.
Get Instant QuoteMegtron-Compatible Design
Existing Megtron stackups migrate with under 3% trace adjustment.
Domestic China Supply
Zero duty, direct fab delivery, 1-2 week replenishment.
RTF Foil Required
Pair with HVLP copper for full performance realization.
Volume Breaks
Significant pricing improvement at 100+ panel volumes.
Genuine Shengyi S7439, Verified on Every Order
Material CoC
Certificate of Conformance with lot number ships with every order.
Stock Verified
We confirm laminate availability before order confirmation.
No Substitutions
Specified material guaranteed — never swapped without written approval.
FAQ
Shengyi S7439 Questions
What is Shengyi S7439?
The flagship ultra-low-loss laminate from Shengyi (SYTECH), world #2 CCL maker. Dk 3.0, Df 0.0013 at 10 GHz — Megtron 7 performance at the industry's most competitive pricing.
S7439 vs Megtron 7?
Functionally equivalent — within 3% insertion loss on identical test vehicles. S7439 costs 30-40% less at volume due to Shengyi's manufacturing scale.
Is S7439 qualified outside China?
S7439 is gaining international qualification. Major Chinese and some international ODMs have qualified it. Check with AtlasPCB for current qualification status at your target fabricator.
What is the minimum order?
No minimum from AtlasPCB. Standard thicknesses available from stock. Custom thicknesses have 2-3 week lead time from Shengyi factory.
Can I migrate from Megtron to S7439?
Yes. Same design rules apply. Expect under 3% trace width adjustment for impedance matching due to slight Dk/Df measurement differences between labs.
Need Shengyi S7439 fabrication?
S7439 — Dk 3.0, Df 0.0013, Megtron 7 performance at scale pricing — for AI and data center builds.
Related Materials
Browse all 30+ PCB materials we stock and fabricate.