Issue link: https://iconnect007.uberflip.com/i/1544707
30 SMT007 MAGAZINE I MAY 2026 woven glass fibers embedded in epoxy resin. They were designed to be low cost, easy to manufac- ture, and electrically functional for most applica- tions, but they come with inherent limitations. Their thermal conductivity is poor, their mechani- cal stability at high temperatures is limited, and their coefficient of thermal expansion (CTE) is mismatched with silicon. That matters because as power densities increase and frequencies climb, those weaknesses dominate performance. Ceram- ic circuits were not created to improve FR-4, but to eliminate their limitations. 2. Ceramics Are Engineered Platforms Here's where the shift happens: A true ceramic circuit is not built by laminating layers together. It is built on a solid ceramic foundation. Materials like alumina (Al₂O₃), aluminum nitride (AlN), silicon nitride (Si₃N₄) are not fillers. They are the structure, and that changes everything. Rather than incre- mental improvement, it's a completely different physical behavior. Ceramic substrates offer: • Thermal conductivity up to 100x higher than FR-4 • Excellent electrical insulation even at high temperatures • Stable mechanical properties across extreme environments 3. Heat Is the Real Battleground Electronics don't fail because of electronics; they fail because of heat. Ceramic circuits dominate because traditional PCBs trap heat, while ceramics move it. Our technologies—like direct bond copper (DBC), active metal brazed (AMB), and PCTF®—are specifically designed to pull heat away from the die, spread it efficiently across the substrate, and maintain structural integrity under thermal cycling. This enables higher power density, longer opera- tional life, and more compact designs. Their ceramic cores—Al₂O₃, AlN, Si₃N₄—are selected specifically for thermal conductivity and CTE matching, reducing stress on semiconduc- tor devices. That matters more than most people realize because thermal mismatch is one of the leading causes of failure in high-power electronics. Ceramics align with the physics. 4. Metallization Changes the Game Most PCB designers overlook metallization. In traditional PCBs, copper is laminated or etched onto a surface, whereas in ceramic circuits, espe- cially with our plated-copper thick-film technology, the copper is engineered into the structure. This creates: • Higher current carrying capability (50+ amps) • Superior adhesion and durability • Fine-line capability for high-frequency circuits • Integrated features like vias, resistors, and multilayers The key difference is that you're routing signals, and engineering an electrical and thermal system simultaneously. 5. Reliability Is Built In, Not Designed Around With FR-4, reliability is something you design around, adding heat sinks, thermal vias, and cool- ing systems. With ceramic circuits, reliability is built into the material itself. Ceramic substrates can: • Withstand thermal cycling from -65°C to 150°C for over 1,000 cycles • Maintain adhesion, via integrity, and hermetic performance • Operate in extreme environments like space, defense, and medical systems This is why ceramic circuits are found in EV power modules, aerospace and defense electronics, RF and microwave systems, and medical devices. These are failure-is-not-an-option environments. 6. Frequency Changes Everything As we move into higher frequency applications, such as RF, microwave, mmWave, the differences become even more pronounced. Ceramic circuits offer lower signal loss, stable dielectric properties, P OW E R I N G T H E F U T U R E