Every finished electronic product depends on parts most people never see. That starts with the ultra-pure silicon chips are made from and includes the timers, sensors, switches, circuit boards and cable assemblies that let machines measure, control and communicate. Most of these parts go to equipment makers, factories, hospitals, utilities and defense contractors, not to consumers. But where they are made decides how secure the supply chain is for everything built from them.
The makers on this page cover that range. Hemlock Semiconductor in Michigan is the only US-headquartered maker of the hyper-pure polysilicon used for chip wafers. Kanson Electronics and Delta M make industrial timers, sensors and flow, level and temperature instruments in Tennessee, with Delta M's technology coming from Oak Ridge National Laboratory. Nortech Systems builds circuit boards, cable assemblies and finished medical and industrial devices for other companies in Minnesota, and also has plants in Mexico and China. Each listing shows what is made here and what is imported.
See also computers, displays, solar and battery chargers.
Delta M Corporation makes thermal-dispersion instruments for measuring flow, level and temperature in industrial processes. Its products include microtuf, VERSA-SWITCH and other mass flow switches; point and multi-point level switches; VersaMassTer and TrendMassTer gas mass flow meters; and temperature sensors, mineral-insulated cable and heater assemblies. Specialty models include truck and railcar loading probes for overfill prevention, 3-A sanitary switches for food and dairy plants, low-flow sensors and sensors that can be removed while the line is running. It also makes nuclear reactor instruments.
Delta M was founded in Oak Ridge in 1983 as one of the first Department of Energy technology transfers from Oak Ridge National Laboratory. Its first products monitored coolant levels in nuclear reactor cores, using very thin differential thermocouples it makes with its own patented process. It runs a nuclear-grade quality program that meets federal 10 CFR 50 Appendix B requirements, and it later applied the same technology to level and flow switches for the process industries.
Made in: Oak Ridge, TN (design, development and manufacturing, including sensor fabrication).
Source: Delta M about, 2026 · Made in Tennessee, 2024, checked 10/2026
Oak Ridge, TN
Hemlock Semiconductor (HSC) makes hyper-pure polysilicon, the extremely refined silicon from which the wafers for computer chips are made. It also makes other silicon-based products. HSC is one of only five major companies worldwide that make semiconductor-grade polysilicon, and it is the only polysilicon maker headquartered in the United States. Nearly every electronic device in the world contains HSC polysilicon, and the company also supplies the solar panel industry with low-carbon polysilicon.
HSC has made polysilicon at its chemical processing plant in Hemlock, Michigan since 1961 and celebrated 65 years in 2026. A new plant there will add capacity for semiconductor-grade polysilicon. It is backed by a $325 million federal CHIPS award, about $407 million in private investment and up to $40 million from Michigan, and is expected to create up to 180 permanent jobs, with production planned for 2028.
Made in: Hemlock, MI (polysilicon production; second plant planned for 2028).
Source: Hemlock Semiconductor about, 2026 · Michigan Banner, 2026, checked 10/2026
Hemlock, MI
Kanson Electronics makes ISSC industrial timers, sensors and counters for equipment makers and industrial controls. Its timers include delay, interval, programmable, watchdog, 2×2 block, DIN and DIN-rail models, built to customer-specified voltages with sealed circuits that need no maintenance. Its sensors include cylindrical proximity sensors from 3 mm to 18 mm, inductive proximity, limit-style, magnetic and motion sensors, and liquid, voltage and resistance detectors, all in sealed, resin-filled cases. It also does contract assembly of electrical and electro-mechanical subassemblies and systems.
ISSC timers and sensors have been made in the US since 1963. Kanson is now veteran-owned, after being woman-owned from 1979 to 2013. It works from a 30,000 sq ft manufacturing and technical center in Hohenwald, Tennessee, where it also does screen printing and powder coating for timer enclosures, and every sensor is tested and cycled before it ships. Its Modor Plastics division molds thermoplastic and thermoset parts in the US. Many ISSC timers have run in the field for decades without maintenance.
Made in: Hohenwald, TN (design, electronics assembly, molding, powder coating and testing; its timers are "100% Made in the USA").
Source: Kanson Electronics, 2026 · Kanson about, 2026, checked 10/2026
Hohenwald, TN
Nortech Systems is a contract manufacturer that designs and builds complex electronic medical devices and electromechanical systems for other companies. Its work includes printed circuit board assemblies, wire and cable assemblies, fiber-optic and other high-reliability connections, and complete finished products. Its customers are makers of medical devices, medical imaging equipment, aerospace and defense systems, and industrial equipment, and more than half its sales come from medical markets.
Nortech was organized in 1990 and had 685 full-time employees at the end of 2025. Its Minnesota plants are in Bemidji (69,000 sq ft), Mankato (58,000 sq ft) and Milaca (20,000 sq ft, an FDA-registered medical device facility). Its plant in Monterrey, Mexico is certified to the AS9100 aerospace standard, and its plants in Suzhou, China are certified for Class II medical devices. Together, the Mexico and China plants have slightly more manufacturing space than the Minnesota plants.
Made in: Bemidji, Mankato and Milaca, MN (circuit board, cable and medical device manufacturing); headquarters in Maple Grove, MN.
Imported: assemblies from its plants in Monterrey, Mexico and Suzhou, China.
Source: Nortech 10-K, 2026, checked 10/2026
Maple Grove, MN
Component makers by state
- Michigan: Hemlock Semiconductor (Hemlock), hyper-pure polysilicon for semiconductors and solar
- Minnesota: Nortech Systems (Bemidji, Mankato and Milaca), circuit boards, cable assemblies and contract-built medical and industrial devices
- Tennessee: Delta M (Oak Ridge), thermal flow, level and temperature switches, meters and nuclear instruments
- Tennessee: Kanson Electronics (Hohenwald), ISSC industrial timers, sensors and counters, plus contract assembly
Types of electronic components
Semiconductor materials come first. Polysilicon is refined to extreme purity, grown into single-crystal ingots and sliced into the wafers on which chips are built. Only a handful of companies worldwide make semiconductor-grade polysilicon.
Timers and relays control when equipment starts, stops or repeats an action. Delay, interval, programmable and watchdog timers run pumps, conveyors, HVAC systems, safety interlocks and machine controls.
Sensors and switches detect position, motion, liquid, voltage, flow, level or temperature and signal a control system to act. Industrial versions are sealed against dust, moisture and vibration.
Process instruments such as thermal mass flow meters and level switches monitor tanks, pipelines and loading stations. They help prevent overfills, dry-running pumps and leaks.
Contract-built assemblies are made by contract manufacturers for brand-name companies. These include circuit boards, wire and cable harnesses and complete finished devices, built to the customer's design.
Choosing components and suppliers
- Match the environment. Look at ratings for temperature, moisture, vibration, hazardous locations and washdown.
- Check certifications. These include ISO 9001 for quality, ISO 13485 and FDA registration for medical devices, AS9100 for aerospace, IPC-A-610 for circuit board workmanship and nuclear-grade programs for reactor parts.
- Ask about traceability. Defense, medical and nuclear buyers often need to know where every part and material came from.
- Consider lead times and support. Domestic makers can often ship faster, customize more easily and help with failure analysis.
- Verify the plant. Many component suppliers run plants in several countries, so confirm which plant builds your parts.
Reading "Made in USA" on electronic components
Under FTC rules, an unqualified "Made in USA" claim means all or virtually all of the product is made here. Simpler parts like timers, sensors and instruments built from domestic materials can meet that standard. Complex assemblies usually can't, because many chips, passive components and raw materials are imported even when the boards and final assembly are done in the US. Government buyers may also need to meet Buy American, Trade Agreements Act or defense sourcing rules, which use their own tests. When origin matters, ask the supplier which plant builds the part and where its key materials and chips come from.
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A company may be based in the USA while making some products elsewhere. Check the manufacturer's own site for where a specific product is made.