Vishay Americas - through its company acquisition - design and manufactures NTC thermistors and PTC thermistors used in over temperature/current protection, fluorescent lighting, and motor start applications. The company's line of PTC, ceramic thermistors includes 19 models, while the company distributes 29 different NTC thermistor types.

Watlow Electric Manufacturing Company manufactures thermistor that are highly-sensitive to small changes in temperatures as they feature accuracies of +/- 1 percent at 77 F to +/- 15 pecent at 32 F. The thermistors can handle temperatures ranging from -75 to 500 F and -60 to 260 C.

AdSem Inc. develops and produces germanium and silicon cryogenic thermistors for measurements of low and ultra-low temperature. The company also manufactures germanium high temperature NTC interchangeable thermistors that feature a temperature range of -100 C to 300 C. These thermistors are for applications that require small size, high thermo-sensitivity and lower resistance value. The company also distributes silicon thermistors for applications in the temperature range of 20 C to 500 C.

AMWEI Thermistor Co. Ltd. manufactures through hole and SMD PTC and NTC thermistors. The company's PTC thermistors are used in over-current and overland protection, telecom, light switching, motor starting, temperature sensing and protection, and self-regulation heating applications. The NTC thermistors are available in either radial leaded, axial leaded or surface mount configurations.

Murata Manufacturing Co. Ltd. produces PTC thermistors and NTC thermistors. The PTC thermistors are used to detect overheating and protect circuits should electronic equipment draw too much current. The NTC thermistors are used for inrush current protection and temperature compensation within electronic equipment.

Sensor Scientific Inc. distributes eight thermistor types: epoxy-coated chip,m interchangeable chip, glass probe, glass encapsulated, standard bead, small bead, insulated lead interchangeable chip, and insulated lead epoxy-coated.

Thermometrics supplies a number of NTC thermistor and PTC thermistor types. The line of NTC thermistor types includes: interchangeable, epoxy coated chip, glass encapsulated, uncoated disc with radial leads, disc with radial leads, disc for inrush current limiting, unleaded disc, surface mount chip, glass encapsulated surface mount chips, bare bead, glass coated bead, glass encapsulated bead and chip, and high temperature. Over temperature protection, over current protection, self-regulating heater, and liquid level sensing comprise the four PTC thermistor types.

EMRA Controls Inc. is a Northwest supplier of industrial electronics including sensors and transducers manufactured by Tri-Tronics, Setra, and Delavan. The company also distributes products manufactures by Clearwood Services, CTM Magnetics, Greyline, Innovation Solutions, Airotronics, Athena, and Contrinex.