This is Part 4 of a five-part series on semiconductor demand in the age of AI warfare. Part 3 described the FPV drone revolution and its scale.

Mapping the Japanese Supply Chain

The previous article described the bill of materials for an FPV combat drone. In this article, we map that bill of materials to specific Japanese listed companies — what they supply, what their current drone exposure is likely to be, and how that exposure might grow.

The honest caveat upfront: most of these companies do not break out military or drone-specific revenue. The analysis below is supply-chain inference, not company-confirmed guidance. Treat it as a framework for asking questions, not a precise revenue forecast.

Sony Semiconductor Solutions (6758 — Sony Group)

Role in the drone: Image sensors. FPV drones require a camera for navigation and, in military applications, increasingly for AI-assisted target acquisition. Sony’s IMX series image sensors — originally designed for smartphones — dominate global image sensor market share at approximately 40-50%.

Sony Semiconductor Solutions operates as a subsidiary of Sony Group and is not separately listed. But for investors in Sony Group, semiconductor revenues represent approximately 10-15% of total consolidated revenue, and the image sensor business is the highest-margin segment within that.

The drone military market represents a new end-market that Sony’s sensor division has not historically served. Commercial drones — DJI and its supply chain — have used Sony sensors for years. The step from commercial to military is less a technology gap than a supply chain qualification and export control question. Sony sensors shipped to drone manufacturers in allied nations — Ukraine, Taiwan, South Korea — are within existing export frameworks.

What to watch: Whether Sony begins to segment or disclose drone/defense sensor revenue; any regulatory developments affecting export of dual-use imaging components.

Renesas Electronics (6723)

Role in the drone: Flight controller MCU. The microcontroller that manages a drone’s stabilization loops, motor outputs, GPS integration, and sensor fusion is typically a 32-bit ARM Cortex-M series processor. Renesas’s RZ/A and RA series are widely used in industrial robotics, automotive control, and increasingly in commercial drone flight controllers.

Renesas is the world’s third-largest MCU supplier and holds approximately 30% share in automotive microcontrollers. Its industrial and IoT segment — which includes drone-adjacent applications — has been growing as automation demand expands.

The key fact for drone demand is that Renesas does not need to manufacture a “drone chip.” The same general-purpose MCU that controls a robotic arm or an HVAC system controls an FPV drone’s flight computer. Incremental drone demand adds to a volume base that already justifies the fab investment.

What to watch: Guidance on industrial and robotics segment demand; any disclosure of aerospace/defense end-market growth in the medium-term.

Murata Manufacturing (6981)

Role in the drone: RF components. The radio link between drone and operator — and the drone’s GPS receiver — rely on RF filters, chip antennas, and passive components. Murata is the world’s largest manufacturer of multilayer ceramic capacitors (MLCC) with approximately 40% global market share, and also supplies SAW/BAW filters and RF modules.

Murata’s drone exposure is diffuse rather than concentrated: its MLCC and RF components are present in virtually every piece of consumer electronics, including the commercial drones from which military FPV designs are derived. A sustained military drone production ramp — running millions of units per year globally — represents incremental demand against Murata’s existing production base.

MLCC is also a key component in EV power electronics and datacenter power supplies. Murata’s component demand thesis is multi-vector: AI infrastructure, EV transition, and defense electronics are all additive.

What to watch: MLCC pricing and utilization trends (indicator of overall electronics component demand); any capacity expansion announcements.

Rohm Co. (6963)

Role in the drone: Power management ICs. Every drone needs a battery management system, motor driver ICs, and DC-DC converters to efficiently route power from the LiPo battery to four brushless motor controllers. Rohm is a significant supplier of SiC power devices, motor driver ICs, and analog/mixed-signal semiconductors.

Rohm’s investment thesis has been driven primarily by the EV market — SiC MOSFETs for electric vehicle inverters are a high-growth segment. The drone market provides a secondary power electronics demand driver: the core power architecture of a racing drone (high-current switching, low-loss efficiency) has architectural similarities to EV power electronics, and Rohm’s product line serves both.

What to watch: SiC revenue growth; any indication of industrial robotics or autonomous systems end-market uptake.

TDK Corporation (6762)

Role in the drone: Passive components and communications. TDK supplies ferrite cores, inductors, transformers, and EMC components used throughout power electronics — all present in drone motor controllers and battery management systems. TDK also supplies components into wireless communications modules.

Like Murata, TDK’s drone exposure is structural rather than direct: the company supplies components that go into virtually every piece of electronic hardware, and a military drone is no exception. TDK also owns InvenSense, a MEMS sensor company whose gyroscopes and accelerometers are used in consumer and commercial drone inertial measurement units (IMUs).

What to watch: MEMS sensor volume growth (indicator of drone/robotics proliferation); ferrite core demand trends as power electronics proliferate.

Kioxia Holdings (未上場 — but supply chain adjacent)

Kioxia is not yet listed (IPO discussions ongoing), but is relevant: higher-end drones with autonomous or AI-assisted navigation capabilities carry onboard NAND flash for mission data logging and edge inference. This is a secondary market for Kioxia relative to its datacenter and smartphone volumes, but represents the same thematic exposure.

The Investment Framework

The drone/defense demand thesis for Japanese semiconductors is best understood as a supplement to existing investment cases, not a standalone catalyst.

  • Sony: Drone sensors are a new vertical for an existing product. Optionality on regulatory environment.
  • Renesas: Industrial MCU volumes benefit from any increase in automated/robotic systems, including drones.
  • Murata: Structural, multi-vector component demand — drones add to EV and AI infrastructure tailwinds.
  • Rohm: Power electronics thesis (EV-first, drone-secondary) with SiC as a differentiated product.
  • TDK: Passive components and MEMS sensors; drone proliferation is one of several demand drivers.

None of these are pure-play drone stocks. They are companies with strong existing businesses where drone production represents incremental demand that is growing from near-zero. The question for investors is whether that incremental demand is large enough to move revenue at companies with hundreds of billions of yen in annual sales.

At tens of thousands of drones per month across multiple countries — and that number growing — the answer is approaching “yes” faster than the consensus valuation implies.

The final question is whether this thesis holds in a broader investment framework, and how to think about risks. That is Part 5.

Part 5 — “AI Bubble or Structural Shift? An Investment Framework for 2026 Semiconductors” — is available here.

Source: Company IR materials and public disclosures | 日本語版

Disclaimer | This article is for informational purposes only and does not constitute investment advice.