| Decision | LTCC | HTCC |
|---|---|---|
| Material system | Glass-ceramic tape with compatible conductors | High-temperature ceramic/conductor system |
| Conductor examples | Copper, silver or gold depending on system | Often tungsten or molybdenum |
| Typical emphasis | RF integration and embedded functions | Robust package and feedthrough structures |
| Common design needs | Fired dimensions, vias, cavities and test access | Fired dimensions, vias, cavities and test access |
Choose a material set, not a temperature label
The dielectric, conductor, via paste and atmosphere must work together. Different LTCC grades can have quite different CTE and RF behavior. HTCC also covers qualified material variants. Obtain the actual system data before layout.
Review the package assembly
Leads, seal rings, lids and heat paths may drive the choice as strongly as internal routing. Confirm which attachments are supported by the selected material and process, including final pad finishes.
Compare lifecycle cost carefully
Conductor materials, tooling, layer count, yield and inspection affect cost. A broad claim that one family is always cheaper is not reliable. Compare quotes against the same functional and acceptance requirements.
Engineering example
A filter module and a hermetic feedthrough package may both be multilayer ceramic, but their dominant requirements differ. Use the functional target to select a system rather than copying a layer stack from another product.
Before you release the design
- Specify tape, conductor and fired geometry.
- Review external attachments and thermal paths.
- Plan measurement of embedded functions.
Sources and further technical reading
Manufacturer references support the material and process context. Worked examples and checklists are engineering guidance; they are not test results or supplier guarantees.