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Ceramic PCB

Ceramic PCB
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For high-power, high-frequency, and extreme-environment applications, Ceramic PCBs are the preferred choice of many engineers thanks to their excellent thermal conductivity, insulation, and high-temperature resistance. Unlike traditional epoxy fiberglass boards, a ceramic substrate PCB uses inorganic materials such as alumina (Al₂O₃) and aluminum nitride (AlN) directly as the insulating layer, enabling it to withstand high thermal shock while maintaining stable electrical performance.

For applications requiring high current capacity and exceptional heat dissipation, Ceramic PCBs can be combined with Heavy Copper PCB technology to achieve even greater current-carrying capability and thermal management performance. This design approach is particularly common in power electronics, automotive electronics, and high-end LED lighting.
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Description
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Common ceramic substrate types include:

 

  • Alumina Ceramic PCB: Offers high cost-effectiveness, thermal conductivity of approximately 20–25 W/m·K, excellent insulation, and high mechanical strength, making it suitable for most medium- to high-power applications.
  • Aluminum Nitride Ceramic PCB: Thermal conductivity of 170–230 W/m·K (and up to 300 W/m·K), with a coefficient of thermal expansion close to silicon, making it ideal for high-power semiconductor packaging and high-frequency applications.
  • Beryllium Oxide Ceramic PCB: Extremely high thermal conductivity (209–330 W/m·K), second only to diamond, suitable for extreme high-temperature and high-density packaging. Strict safety measures are required during processing.
  • Thick Film Ceramic PCB: Uses screen-printed thick-film conductor paste, sintered to form circuits. Resistant to high temperatures and corrosion, suitable for high-reliability applications.
  • Single side ceramic PCB vs. Multilayer ceramic PCB: Single-sided boards offer simpler structure and lower cost; multilayer designs enable more complex interconnections, often used in high-end power modules.

In some high-power designs, ceramic substrates are paired with pcb heavy copper processes, increasing copper thickness (e.g., 3 oz–10 oz) to significantly enhance current capacity and heat dissipation.

Ceramic PCB-1

 

Manufacturing Processes and Performance Advantages

 

Ceramic PCB boards can be produced using various processes, each suited to different thickness, precision, and cost requirements

 

DPC (Direct Plated Copper)

PVD + electroplating process, copper thickness 10–140 μm, ideal for high-precision circuits.

01

DBC (Direct Bonded Copper)

Oxidation bonding of copper to ceramic, copper thickness up to 140–350 μm, suitable for Heavy Copper PCB designs.

02

LTCC (Low-Temperature Co-fired Ceramic)

Sintered at 850–900 °C, suitable for multilayer circuits and high-frequency applications.

03

HTCC (High-Temperature Co-fired Ceramic)

Sintered at 1600–1700 °C, suitable for high-temperature environments.

04

Thick Film Process

Printing conductor/dielectric layers on a ceramic substrate, then sintering at high temperature.

05

 

Core Performance Advantages

 

  • High thermal conductivity (25–330 W/m·K), far exceeding FR-4 (approx. 0.8–1 W/m·K)
  • Low thermal expansion coefficient, reducing solder joint fatigue from thermal cycling
  • Excellent insulation, protecting components from heat damage
  • Corrosion and high-temperature resistance, stable operation up to 800 °C
  • Can be combined with Thick Copper PCB technology to increase power density and reliability

 

Typical Applications

 

  • Power electronics: IGBT modules, MOSFET driver boards, inverters, and other high-power modules
  • LED lighting: High-power LED substrates to extend light source lifespan
  • RF/microwave: Antenna arrays, power amplifier modules
  • Automotive electronics: Motor controllers, vehicle radar, power driver modules
  • Medical equipment: High-precision imaging probes, laser driver boards

In these applications, combining Ceramic PCBs with Heavy Copper Circuit Board technology can significantly improve system thermal management and electrical stability, extending device lifespan.

Ceramic PCB-2

 

Design and Manufacturing Considerations

 

  • Match copper thickness and trace width to balance current capacity and heat dissipation
  • High thermal conductivity materials (e.g., AlN, BeO) suit high-power density and high-frequency applications, but require cost trade-offs
  • Interlayer connections in multilayer ceramic PCBs require precise control of sintering shrinkage
  • In high-current designs, integrating Heavy Copper PCB processes can further enhance reliability
  • Account for the brittleness of ceramics in board shape and mounting design
DFM PCB design-3

 

Summary

 

Whether it's a ceramic substrate PCB or an alumina ceramic PCB, the core value of a ceramic printed circuit board lies in providing robust physical and electrical support for high heat flux, high-frequency, and high-reliability applications. For engineering projects pushing performance limits, a ceramic circuit board is not just a material choice-it's a key factor in system stability.


Shenzhen STHL Technology Co., Ltd. has extensive experience in ceramic PCB and Heavy Copper PCB manufacturing, offering one-stop solutions from material selection and structural design to mass production, helping your products excel in high-power, high-reliability markets.

 

Consult our engineers at info@pcba-china.com and experience STHL's services-starting with a Ceramic PCB today.

 

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