Honeywell 3450RC81000427

Thermistors change resistance with temperature; they do not amplify, rectify, polarize, or generate signals. A thermistor's temperature can be changed by the surrounding environment or by self-heating through applied current. Most applications — such as temperature measurement and control or copper coil compensation — require that power dissipated in the thermistor be kept to a minimum to prevent significant self-heating. Other applications rely entirely on the self-heating effect. When the ambient temperature is fixed, the thermistor's resistance depends largely on its internally dissipated power, which raises its temperature above the surroundings. Under these operating conditions, the temperature may rise 100°C to 200°C (121°F to 392°F), and at low currents the resistance may drop to 1/1000 of its original value. This self-heating characteristic gives thermistors a wide range of applications. In the self-heated state, the thermistor is thermally sensitive (its resistance changes) to any condition that alters its rate of heat dissipation. If the heat dissipation rate is ideally fixed, the thermistor is sensitive to power input and is suitable for voltage or power level control applications. Glass Encapsulated Chip (GEC) thermistors are high-quality, hermetically sealed, glass-encapsulated chip thermistors in axial-lead packages, covering the full temperature range of -60°C to 300°C (-76°F to 572°F). These rugged sensors are designed for many applications requiring low-cost reliability, and their uniform dimensions are generally well-suited for automated assembly. Epoxy-coated or uncoated chip thermistors offer a wide selection of custom resistance values and R/T curves, available in two lead types. Disc thermistors are available uncoated or epoxy-coated, with a wide selection of custom resistance values and R/T curves, supplied with uninsulated leads only, in diameters ranging from 2.54mm (0.1 in.) to 10.16mm (0.4 in.); they are generally suited for low-cost applications up to 150°C (302°F), are compatible with PC board mounting, and are available in tape-and-reel packaging.

• Glass Encapsulated Chip (GEC) Thermistors: High-quality, hermetically sealed, glass encapsulated, axial lead package, covering -60°C to 300°C temperature range, suitable for automated assembly.
• Epoxy-coated or Bare Chip Thermistors: Wide range of customizable resistance values and R/T curves, available in both uninsulated and insulated lead types, operating temperature range -40°C to 125°C, minimum dissipation constant 0.75mW/°C, maximum time constant 15s, resistance range 100Ω to 100kΩ at 25°C.
• UNI-CURVE® Interchangeable Thermistors: Temperature-matched, no individual resistance-temperature calibration required, cost-saving, operating temperature range -40°C to 150°C, epoxy-coated, tin-plated copper alloy leads, minimum dissipation constant 0.75mW/°C, maximum time constant 15s, resistance range 1kΩ to 100kΩ at 25°C.
• Disc Thermistors: Available uncoated or epoxy-coated, uninsulated leads only, diameter 2.54mm to 10.16mm, suitable for low-cost applications up to 150°C, PC board mountable, tape-and-reel packaging available, operating temperature range -60°C to 150°C, dissipation constant 3mW/°C to 8mW/°C, time constant 10s to 32s, resistance range 100Ω to 100kΩ at 25°C.

• Temperature measurement
• Temperature control
• Copper coil compensation
• Voltage control
• Power level control