26L N4000-13EP+3M C-Ply Buried Capacitor PCB Boards

26L N4000-13EP+3M C-Ply Buried Capacitor PCB Boards

Board Size: Customized, standard sample size 1718CM

Base Material: Nelco N4000-13EP high speed laminate + 3M C-Ply buried capacitance material

Finished Board Thickness: 2.0mm~4.0mm, tolerance ±0.08mm

Signal Copper Thickness: 0.5oz / 1oz / 2oz

Power Layer Copper Thickness: Up to 4oz

Max Panel Size: 520mm620mm 

This 26-layer printed circuit board supports ultra-fine circuit feature size with minimum line width and line space down to 3mil/3mil, matched with 0.1mm micro blind and buried vias for dense interlayer interconnection. It adopts precision impedance control technology with tolerance controlled within ±5Ω, fully satisfying differential 100Ω and single-ended 50Ω high-speed circuit requirements. Standard surface finish options include ENIG, ENEPIG and Hard Gold plating, paired with black or green solder mask and white silkscreen for clear component marking. The whole buried capacitor circuit board complies with UL94 V-0 flame retardant standard and halogen-free formula, conforming to RoHS and REACH environmental compliance rules. Copper thickness ranges from 0.5oz to 2oz for signal layers and up to 4oz thick copper for power supply planes to carry large current load. All finished multilayer PCB boards undergo full electrical flying probe testing, X-ray void inspection and TDR impedance scanning before delivery to eliminate open, short and abnormal capacitance defects. The board thickness can be customized from 2.0mm to 4.0mm according to customer stack-up demands, with strict overall thickness tolerance within ±0.08mm to avoid assembly interference during SMT processing. Sequential lamination process is adopted for the 26L stack-up, which can withstand 4 times high-temperature pressing cycles without substrate degradation, perfectly compatible with the multi-lamination manufacturing characteristics of N4000-13EP high Tg laminate. 

This 26L N4000-13EP + 3M C-Ply buried capacitor printed circuit board adopts Nelco N4000-13EP high-speed low-loss laminate matched with 3M C-Ply embedded capacitance material for the power plane stack-up. Featuring 26-layer high-density multilayer PCB structure, it delivers ultra-low parasitic inductance and stable distributed capacitance to ｒｅｐｌａｃｅ massive discrete decoupling capacitors, effectively suppressing high-frequency power noise and EMI interference. The N4000-13EP substrate boasts high Tg over 210°C, low Dk/Df and excellent CAF resistance, supporting precise impedance control and consistent signal integrity for high-speed digital circuits. Integrated 3M C-Ply buried capacitor layers simplify PCB layout, save surface routing space, cut solder joint risks and enhance long-term thermal cycling reliability. This buried capacitance PCB is widely customized for network switches, AI server mainboards, high-speed test equipment and industrial high-reliability circuit board projects, fully compliant with IPC Class 3 manufacturing standards and lead-free SMT reflow requirements.

This custom 26-layer printed circuit board adopts a hybrid stack-up combining Nelco N4000-13EP low-loss high-speed core material and 3M C-Ply embedded capacitance dielectric layers, delivering stable buried capacitor performance inside the multilayer circuit board structure. Strict lamination alignment and symmetric layer layout control layer shift tolerance within ±5μm, effectively suppressing warpage and interlayer delamination during mass production. The N4000-13EP laminate features ultra-high Tg above 210°C, low Z-axis thermal expansion and excellent CAF resistance, supporting multiple lead-free reflow cycles without structural deformation. All internal power and ground layers are paired with ultra-thin 3M C-Ply sheets to build uniform distributed capacitance across the entire PCB area. Compared with standard multilayer circuit boards using discrete surface MLCCs, this 26L buried capacitor PCB equipped with 3M C-Ply drastically reduces parasitic inductance of the power distribution network. The embedded capacitance material provides high capacitance density up to 10.5 nF/in², efficiently suppressing high-frequency power noise, power plane resonance and radiated EMI interference within 1–10GHz frequency band. Matched with N4000-13EP’s low Dk/Df characteristics, the high-speed printed circuit board maintains consistent differential impedance and outstanding signal integrity for high-speed differential signals, eliminating signal distortion and attenuation in AI computing and network transmission systems. Integrating 3M C-Ply buried capacitance layers into the 26-layer PCB stack greatly simplifies circuit board layout design and frees up massive surface routing space. Engineers can remove hundreds of surface-mounted decoupling capacitors, cutting SMT solder joint quantity and lowering assembly defect risks such as cold joints and component drop-off. The embedded capacitor structure also reduces total board outline size and weight, making this multilayer circuit board ideal for compact high-density hardware designs. Blind and buried vias are reasonably distributed to connect signal traces directly to embedded capacitance planes, shortening current transmission paths and further optimizing transient power response performance. All 26L N4000-13EP + 3M C-Ply buried capacitor PCB boards pass full IPC Class 3 reliability qualification, including 1000-cycle thermal cycling, 85°C/85%RH humidity aging and repeated thermal shock tests. No layer separation, dielectric voids or impedance drift occurs after long-term accelerated aging, meeting strict long-operation requirements of high-end electronic equipment. This high-speed printed circuit board is widely customized for AI server motherboards, 800G network switch mainboards, high-speed semiconductor test circuit boards and industrial high-power control hardware, serving customers with strict high-frequency and high-reliability PCB demands. Adopting 3M C-Ply embedded capacitance technology on N4000-13EP 26-layer circuit boards brings comprehensive cost advantages for terminal manufacturers. Reduced MLCC procurement, placement and rework expenses lower overall BOM and assembly costs. The high thermal stability of Nelco N4000-13EP cuts PCB production scrap rate during lamination and drilling processes. Our factory supports small-batch prototype and mass production of buried capacitor PCB boards, offering customized stack-up design, precise impedance tuning and full electrical testing services for all high-speed multilayer printed circuit board projects.

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