News
Sumitomo Bakelite develops high-voltage insulation sheet with 800V tracking resistance
Wednesday, January 21, 2026 at 06:40 AM
Sumitomo Bakelite has developed a 0.2mm thick high-voltage insulation sheet featuring tracking resistance equivalent to 800V, targeting power semiconductor and electronic component applications.
Context
Sumitomo Bakelite has secured a major supply chain milestone with the adoption of its high-heat-dissipation insulation sheet, BLA-6051, by Denso for automotive power modules. The material is utilized in resin-insulated substrates manufactured by NHK Spring, which are now being integrated into Denso's inverters for electric vehicles. This transition from traditional ceramic substrates to resin-based alternatives allows for significant improvements in weight reduction, cost-efficiency, and design flexibility, solving key thermal management challenges in the high-voltage power semiconductor space.
Technical specifications for BLA-6051 show it achieves thermal resistance equivalent to high-performance silicon nitride substrates while withstanding continuous operation at temperatures exceeding 150°C. This capability is particularly critical for the rising adoption of SiC (silicon carbide) power semiconductors, which generate intense heat during power conversion. Sumitomo Bakelite is aggressively scaling production to meet this demand, targeting an annual business scale of 10 billion yen by 2035 as the technology expands beyond the automotive sector into industrial inverters and renewable energy infrastructure.
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Sumitomo Bakelite
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