IR & Thermal Sensor Semiconductors

Infrared and thermal sensors detect electromagnetic radiation in the infrared spectrum — wavelengths beyond the visible range (0.7µm) out to 15µm and beyond — enabling temperature measurement, heat imaging, and night vision without visible illumination. They span four distinct detector technologies with entirely different semiconductor processes, materials, supply chains, and qualification requirements. Treating them as a single "IR sensor" category obscures the supply structure: the MEMS vanadium oxide microbolometer in an automotive night vision camera, the HgCdTe photon detector in a missile seeker, the InGaAs photodiode array in a machine vision SWIR camera, and the thermopile in an HVAC occupancy sensor share nothing in their upstream supply chains. Each is a separate story.

The IR sensor supply chain also carries a supply chain constraint found nowhere else in the SX Chip Types node: ITAR (International Traffic in Arms Regulations) export control. High-performance cooled photon detectors and microbolometer arrays above certain resolution and sensitivity thresholds are ITAR-controlled as dual-use technologies — military applications (targeting, missile guidance, surveillance) and civilian applications (automotive, industrial, medical) draw from the same detector technology, creating export licensing requirements that constrain which customers can be served, which countries can receive product, and which foundries can manufacture them.

IR Detector Technology Categories

IR Sensor Families — Products & Suppliers

Deployment & Supply Chain Risk

ITAR & Export Control — The Unique Constraint

IR and thermal sensors are the only device category in the SX Chip Types node where export control is a primary supply chain constraint rather than a secondary geopolitical consideration. The US International Traffic in Arms Regulations (ITAR), specifically USML Category XII (Fire Control, Range Finder, Optical and Guidance and Control Equipment), controls the export of thermal imaging devices, components, and technology above defined resolution and sensitivity thresholds. Key control points:

Microbolometers: Uncooled IR focal plane arrays with pixel pitch below 25µm and array format above 320×240 are ITAR-controlled under Category XII(b). This means a 640×480 automotive night vision module — even for a civilian passenger car — requires a State Department export license for shipment to many countries. The FLIR Boson+ (640×512, 12µm pitch) is ITAR-controlled. The FLIR Lepton (160×120) is EAR-controlled (Export Administration Regulations, Commerce Department) rather than ITAR, which is a less restrictive regime.

Cooled photon detectors (HgCdTe, InSb): Almost universally ITAR-controlled under Category XII(b) regardless of format or sensitivity, because the technology is inherently dual-use for missile seekers, targeting systems, and surveillance satellites. Non-US manufacturers (Lynred in France, Vigo in Poland) produce HgCdTe under equivalent national export control regimes.

Mercury supply chain: HgCdTe production requires mercury (Hg) as a feedstock. The Minamata Convention on Mercury (2017) restricts mercury trade and production globally. HgCdTe producers must operate within national mercury management frameworks, adding a chemical supply chain constraint on top of the semiconductor supply chain. The mercury used in HgCdTe production is a specialty high-purity grade — not sourced from the same streams as legacy mercury contamination.

China supply chain bifurcation: Chinese domestic IR sensor production (Guide Infrared, Dali Technology, HIKVISION Hikmicro) has advanced significantly in uncooled microbolometer technology. Guide Infrared and Dali Technology produce 12µm pitch bolometers domestically and supply large volumes to Chinese industrial and consumer markets. Export of Chinese-produced IR modules to Western defense customers is restricted by ITAR foreign national rules, creating a bifurcated supply chain: US/European producers for Western defense and regulated civilian applications; Chinese producers for Chinese domestic and non-ITAR markets.

Microbolometer MEMS Fabrication — The Specialty Process

Uncooled microbolometers are fabricated in specialty MEMS fabs using a process that is incompatible with standard semiconductor logic foundries. The core element — a suspended VOx or a-Si resistive bridge thermally isolated from the substrate by thin support legs — requires surface micromachining, sacrificial layer etching, and vacuum encapsulation that standard CMOS fabs do not offer. The detector is then bonded to a CMOS ROIC (readout integrated circuit) that digitizes the resistance change from each pixel.

FLIR operates its own microbolometer fab in Wilsonville, Oregon — a vertically integrated MEMS process for VOx detector fabrication that is not outsourced to a conventional foundry. Lynred operates its own fab in Veurey-Voroize, France. This captive fab model is common across the IR detector industry because the specialty process is a competitive moat — and because ITAR restrictions on the technology make outsourcing to general-purpose foundries in Asia difficult or impossible for the highest-performance products. The result is a supply chain where capacity is fixed at the captive fab level and cannot be rapidly expanded by redirecting wafer starts to TSMC or Samsung.

Supply Chain Bottlenecks

Related Coverage

Sensor Semiconductors Overview | Perception & Environment Sensors Hub | CMOS Image Sensors | LiDAR Sensors (InGaAs APD) | Radar Sensors | Sensor Fusion | GaAs & InP Wafer Supply Chain | Semiconductor Bottleneck Atlas

Cross-Network — ElectronsX Demand Side

Automotive night vision IR cameras (FLIR Boson-based modules) are an ADAS feature growing with EU NCAP scoring pressure — a direct EV and ADAS supply chain dependency subject to ITAR export control. Automotive cabin thermopile arrays (Melexis MLX90640) are mandatory for child presence detection in EU-market vehicles from NCAP 2025. Industrial thermal cameras for predictive maintenance in EV battery manufacturing and smart grid substation monitoring are growing industrial demand vectors for uncooled microbolometer modules.

EX: ADAS/AV Compute Architecture | EX: EV Semiconductor Dependencies