How to Select Thermal Interface Adhesives for IGBT and SiC Power Modules? Why High Thermal Conductivity Does Not Equal Low Thermal Resistance?
The core performance metric for thermal‑interface materials of IGBT and SiC power modules is not standalone thermal‑conductivity value, but the actual interfacial thermal resistance. Real‑world heat‑dissipation performance is governed by thermal conductivity, bond‑line thickness (BLT), contact area, compression ratio, interfacial wet‑out property and long‑term pump‑out stability. For new‑energy‑vehicle inverters, MCUs and high‑power power supplies, Elaplus TIM grades such as TCMP 1935 and TCMP 3380 may be evaluated. Why SiC Devices Place Higher Demands on Thermal‑interface Materials One major advantage of SiC semiconductors lies in higher switching frequency and elevated power density. Meanwhile, system hardware becomes more compact. This leads to the following chain effect: Same footprint → higher power load → increased heat‑flux density per unit area → thermal interface performance becomes more critical. Poor TIM interface control will trigger rapid chip‑junction‑temperature rise. What Is Interfacial Thermal Resistance? Heat flows from semiconductor chips toward heat sinks via intermediate thermal‑interface materials. Thermal resistance is not determined solely by material thermal conductivity. Simple illustration: ‑ Material A: 8 W/m·K, bond‑line thickness 1.5 mm ‑ Material B: 5 W/m·K, bond‑line thickness 0.3 mm We cannot judge which one delivers lower thermal resistance merely by comparing 8 vs 5. Thicker bond‑line means longer heat‑transfer path. Well‑designed TIM selection must consider thermal conductivity together with bond‑line thickness (BLT). Why Thermal Conductive Gels Are Suitable for IGBT & SiC Power Modules Mismatches frequently occur between power modules and housing assemblies, including: ‑ Manufacturing tolerances ‑ PCB warpage ‑ Component height offset ‑ Heat‑sink flatness deviation Thermal conductive gels deform mechanically to fill these micro‑gaps. Elaplus TCMP 1935 Two‑Component Liquid Gap Filler It builds stable thermal interfaces for IGBT, SiC, MCU, ECU and general power‑electronic modules. Why Reworkability Gains Growing Importance During prototype development of new‑energy‑vehicle electronic assemblies, engineers repeatedly perform: Disassembly → failure analysis → re‑assembly → re‑validation testing. Non‑reworkable TIMs significantly raise…
