The designer's workbench for the Ceramic PCB — substrate selection, build types, live thermal & impedance calculators, design rules and manufacturing know-how in one place. Build it for real at Ceramic PCB by PCBSync.
A Ceramic PCB replaces the FR‑4 epoxy‑glass core with a dense technical ceramic — alumina (Al₂O₃), aluminum nitride (AlN), beryllium oxide (BeO) or silicon nitride (Si₃N₄). The result is a circuit carrier that conducts heat tens to hundreds of times better than FR‑4, isolates voltage, survives extreme temperatures, and stays dimensionally rock‑steady — the foundation of modern power electronics, LED, RF and high‑reliability systems.
Move heat straight off the die. Up to ~250 W/m·K versus ~0.3 W/m·K for FR‑4 — slashing junction temperatures.
High breakdown strength (≈12–16 kV/mm) and low leakage make ceramics ideal for high‑voltage power modules.
Low, tunable CTE matches silicon and SiC dies, while ceramics resist moisture, chemicals and thermal cycling.
The substrate is only half the story. How the conductor is bonded to the ceramic defines line resolution, current capacity, cost and the applications a board can serve.
Thick copper foil (200–800 µm) bonded to alumina or AlN at high temperature. The power‑module workhorse — huge current capacity and a superb heat path.
Sputtered seed plus electroplated copper, photo‑defined. Fine lines/spaces (down to ~50 µm), plated vias and tight tolerances for compact, high‑density designs.
Copper brazed with an active alloy — the strongest bond, paired with Si₃N₄ for brutal thermal cycling. The choice for EV traction inverters and IGBT/SiC modules.
Conductive, resistive and dielectric pastes screen‑printed and fired onto ceramic. Enables printed resistors, multilayer crossovers and rugged hybrid circuits.
Vacuum‑deposited metal patterned by photolithography for ultra‑fine geometry, precision resistors and low‑loss conductors used in RF, microwave and sensors.
Multilayer ceramic tapes laminated and co‑fired with metal. HTCC (tungsten/moly) for hermetic packages; LTCC for embedded passives and RF modules.
Each substrate trades thermal performance, mechanical strength, dielectric behaviour and cost. Headline numbers below are typical engineering values — confirm against your supplier's datasheet and the Ceramic PCB DFM guide.
Bar = thermal conductivity relative to BeO (≈250 W/m·K). Need a side‑by‑side? Use the Substrate Comparator in the Toolkit ↓
First‑order tools to size your thermal path, tune RF traces and pick the right ceramic — right in your browser. No sign‑up, runs offline.
Estimate 1‑D conduction resistance through the ceramic (top metal → bottom metal) and the resulting temperature rise for a given dissipated power. Pick a material to auto‑fill thermal conductivity.
1‑D estimate through the ceramic only. Real stack‑ups add die‑attach, metal, TIM and heatsink resistance, plus lateral spreading. Use as a starting point for thermal budgeting.
For RF and high‑speed traces on a ceramic substrate. Computes characteristic impedance Z₀ and effective permittivity using the Hammerstad–Jensen model. Pick a material to auto‑fill εr.
Quasi‑static estimate; ignores dispersion at very high frequency and assumes a clean ground plane. For controlled impedance, confirm the stack‑up with PCBSync.
Tell us what matters most for your board. The selector weighs thermal, mechanical, RF, isolation, CTE and cost data to recommend a substrate — with the reasoning.
Toggle materials to compare key properties side by side. Best value in each row is highlighted (higher is better for k, strength and dielectric strength; lower is better for CTE and cost).
k = thermal conductivity (W/m·K) CTE = coeff. of thermal expansion (ppm/K) εr @ 1 MHz Flexural strength (MPa) Dielectric strength (kV/mm)
Ceramics reward designers who plan for heat, manage stress and respect the material's brittleness. Apply these rules early to keep yield high and prototypes cheap.
Put the hottest components over the largest metal area and the thinnest practical substrate. Thinner ceramic lowers thermal resistance but reduces mechanical margin — balance with the calculator above.
For SiC/Si power dies under hard thermal cycling, favour AlN or Si₃N₄ (low CTE). Mismatch drives solder fatigue and substrate cracking over thousands of cycles.
Avoid sharp internal corners on metal and outline. Add fillets and keep high‑stress features away from edges; ceramic is strong in compression but brittle in tension.
Thick‑film and DBC need wider geometry (≈150–300 µm); DPC and thin film reach ≈50 µm or finer. Design to your chosen process, not the finest number on a spec sheet.
Choose laser scribing, full laser cutting or dicing up front — each sets edge quality, minimum radius and break‑away tabs. Pre‑scribed arrays change your panel layout.
ENIG and ENEPIG give solderable, wire‑bondable gold; thick gold suits gold‑wire bonding. Specify finish and bond‑pad metallurgy to match your assembly process.
For DBC/AMB, symmetric copper on both faces limits bow and warpage during thermal cycling. Mirror large planes top and bottom where you can.
Ceramic chips and cracks if flexed. Add support, avoid cantilevers, and define clear keep‑outs for fixturing, vacuum pickup and edge clamps in production.
A simplified flow for a metallized single/double‑layer ceramic board. Co‑fired (HTCC/LTCC) adds tape‑casting, lamination and co‑firing of stacked layers.
Select & inspect fired ceramic — Al₂O₃, AlN, Si₃N₄ or BeO — to thickness and flatness spec.
Bond conductor: DBC bonding, DPC sputter + plate, AMB brazing or thick‑film printing.
Image with photoresist and etch (or print) the circuit; form thermal/electrical vias.
Build copper thickness or fire pastes; co‑fired stacks are sintered as one body.
Apply ENIG / ENEPIG / Au and any solder mask or marking for assembly.
Laser scribe, laser cut or dice the array into individual boards.
Electrical test, dimensional, hi‑pot and thermal checks before shipment.
Anywhere heat, voltage, frequency or reliability push FR‑4 past its limits, the ceramic substrate steps in.
IGBT & SiC modules, motor drives, inverters and rectifiers on DBC/AMB substrates.
High‑power and high‑density LED arrays where junction temperature defines lifetime & output.
Low‑loss alumina/AlN for filters, amplifiers, antennas and mmWave modules.
Traction inverters, on‑board chargers and under‑hood electronics needing thermal cycling endurance.
Hermetic packages, radar and avionics demanding stability and high‑temperature reliability.
Implantable & diagnostic electronics needing biocompatible, hermetic, stable substrates.
Laser‑diode submounts and optoelectronic carriers where heat removal is mission‑critical.
Pressure, gas and high‑temperature sensors plus rugged hybrid circuits for harsh environments.
From a single alumina prototype to AlN power modules at volume — get DFM feedback, material guidance and a fast quote from the team behind these tools.
