Power Semiconductors: Rohm, Toshiba, and Mitsubishi Electric Launch Merger Negotiations
2026-03-31
On March 27, 2026, Japan's power semiconductor industry reached a pivotal turning point. Rohm, Toshiba, and Mitsubishi Electric formally signed a Memorandum of Understanding, announcing their intention to deeply integrate their respective power semiconductor businesses and jointly establish a new joint venture operating company.
This consolidation is being led by Rohm, which plans to organically merge its own operations with Toshiba's semiconductor business (excluding the memory division) and Mitsubishi Electric's power semiconductor business, aiming to achieve resource complementarity and synergistic efficiency gains. The three companies stated that core details—including specific integration plans, equity structures, and the form of the new company's establishment—will be gradually determined through subsequent due diligence and business negotiations, with no final decisions having been made at this stage.
Market Landscape Reshaped
According to data from market research firm Omdia, in the 2024 global power semiconductor market, Germany's Infineon held a dominant position with a 17.4% market share; Mitsubishi Electric ranked fourth with 4.6%, while Toshiba and Rohm placed tenth and twelfth with 2.6% and 2.5% respectively. If the three companies' power semiconductor businesses are successfully merged, their combined market share would reach 9.7%, potentially surpassing U.S.-based onsemi (8.5%) to claim the global second position.
From a segment perspective, in the small-signal discrete devices market, the merged new company would also rank second globally with a 19.7% share, trailing only onsemi. In the broader semiconductor market (excluding memory and CPUs), the integrated entity would capture approximately 5.7% of the global market with an effective demand scale of around 28 trillion yen, ranking eighth worldwide.
Strategic Rationale
Although Japan's power semiconductor sector represents a traditional strength, it has faced increasingly fierce competition from low-priced offerings by Chinese manufacturers in recent years. Individual companies' relatively limited scale has gradually placed them at a disadvantage in global competition. Meanwhile, the explosive growth of the electric vehicle industry and the continuous rise in demand from AI data centers have imposed higher requirements on the technological evolution and capacity expansion of power semiconductors.
Rohm explicitly articulated its strategic vision for 2035 in official documents: "To become a globally influential company through semiconductor technology—ranking among the global top ten in power and analog semiconductors." The business integration with Toshiba and Mitsubishi Electric represents a crucial step toward realizing this vision.
Denso's Acquisition Offer and the Choice of Tripartite Integration
Just days before this official announcement, Japanese automotive parts giant Denso had extended an acquisition offer to Rohm valued at nearly 1.3 trillion yen, attempting to monopolize Japan's core power semiconductor resources. However, Rohm ultimately rejected this acquisition proposal, choosing instead to maintain strategic autonomy through the tripartite integration approach. Rather than losing control after being acquired, Rohm prefers to join forces with Toshiba and Mitsubishi Electric to build an autonomous, controllable joint venture capable of competing with global giants.
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