Amwei Thermistor

We are offering linear silicon ptc thermistors temperature sensors.Linear ptc thermistor (lptc) resistance increases with the temperature rises in linearity, displays a virtually linear positive temperature coefficient over their entire temperature range, suitable in measurement and control system, temperature compensation. As the construction material is mainly semiconductor monocrystalline silicon, also called silicon temperature sensor, silicon thermistor, sometimes referred to as silistors. As the temperature coefficient is positive, the silicon temperature sensors exhibit fail-safe operation when a system overheats. Furthermore silicon is inherently stable, so silicon temperature sensor are extremely reliable and have very long operational lifetimes. Hermetically sealed glass package, axial leaded, 2 leads, can operate in high temperature and moisture environment. Linear ptc thermistor in small dimension, tightness, convenient for automatic installation. amwei linear silicon ptc thermistors temperature sensors (lptc) features:1. Silicon temperature sensors have a tk (temperature coefficinet) which is nearly constant over the complete temperature range. Temperature coefficient25500.7%c.2. Excellent long term stability, annual diversification rate0.01cper year, temperature drifts during the lifetime of silicon temperature sensor are negligible.3. Thermal time constant: 10 seconds max in still air. 4. Operating temperature range-40c--+150c.5. Dissipation factor2.5--5mwc. 6. Maximum operating currentiopr=1.0ma. 7. Rated power10mw.8. Typical resistance @25c 600 ohm, 1000 ohm, 1600 ohm, 2000 ohm.

We are offering ptc thermistors limit temperature sensor. Ptc (positive temperature coefficient)thermistor switches at one particular temperature. Making use of the characteristics that the resistance of ptc thermistor increases sharply above curie temperature, when ambient temperature increases abnormally, protective circuit installed ptc thermistor will turn on or cut off loop through resistance changing, achieving thermal protection purpose. Ptc thermistor protect such equipment and components as motors, transformers, power transistors and thyristors against over-temperature. A ptc thermistor is less expensive than a thermostat, and its switch temperature can be more accurately specified. It is also smaller and easier to design-in to electronic circuitry. Therefore ptc thermistor can be ideal devices for temperature detection, monitoring, indicating, limiting and over (excessive) temperature protection. Typical application of ptc thermistor for temperature protection and temperature limiting sensorslimit temperature measurement of industrial electronics application.power supplies, switch power supply.home appliances, such as dish washers, washing machines, ironing machines, electric cookers, etc.electronic data processing and communications engineering (dcdc converters).motor windings overheating protection.automotive electronics.semiconductor heatsinks, enclosure panels, temperature-limited transistors.lighting applications.

We are offering ptc thermistor for telecom over-current protection. Ptc (positive temperature coefficient ) thermistors help provide protection against power cross, power induction surges and lighting surge defined in itu, telcordia, ul. Available in chip, radial-leaded coated and non-coated, smd, twin vertical surface mount configuration. Ptc thermistor overcurrent protector provides reversible, self-resetting protection against over-currents of telecommunication line protector units, improve the reliability of custom premises and network equipment.ceramic ptc thermistors can be found providing re-settable line protection at the exchange, monitoring hot spots and protecting ringers, battery feeds, transformers and relay circuits. Also used extensively to protect the mobile phone's battery pack against overcharging in land-based and radio mobile communications.Advanced developments in telecom equipment in recent years have radically altered the protection requirements of both exchange and subscriber equipment. The ptc thermistor must protect the telephone line circuit against overcurrent, which may be caused by the following examples:surges due to lighting strikes on or near to the line plant.short-term induction of alternating voltage from adjactent power lines or railway systems, usually caused when these lines or systems develop faultsdirect contact between telephone lines and power lines.to provide good protection under such conditions, a ptc thermistor is connected in series with each line, usually as secondary protection; however, even with primary line protection (usually a gas discharge tube), the ptc thermistor must fulfill severe requirements.surge pulses of upto 2kv can occur and in order to withstand short term power induction, the ptc thermistor must withstand high voltages. If the line has primary protection, a 220v to 300v ptc thermistor is adequate. Without primary protection, 600v ptc device is necessary.

We are offering axial leaded glass encapsulated ntc thermistor for temperature sensing. Axial glass encapsulated ntc thermistor features operation up to 300c with excellent stability.glass body provides hermetic seal & voltage insulation, can operate in high temperature and moisture environment.small dimension, solid, convenient for automatic installation. fast heat induction, high sensitivity.nominal resistance @25c can be from 2k 1.388 million ohm.typical resistance at 25c 5k ohm, 10k ohm, 20k ohm, 47k ohm, 50k ohm, 100k ohm, 200k ohm, 500k ohm, 1.388 million ohm etc.tight tolerance on resistance and beta value. axial glass encapsulated ntc thermistor application examples:in household electronics temperature measurement, detection and control: such as air-conditioners, micro-wave ovens, electric fans, and electric heaters, electric cookers, induction cooker, hair driers, etc. temperature detection and compensation of automatic office equipment, such as copiers and printers.in heating and air conditioning (hvac): in heating cost distributors, for room temperature monitoring, in under-flooring heating and gas boilers, for determining exhaust gas or burner temperature, outdoor temperature sensor. industrial electronics: for temperature stabilization of laser diodes and photo-elements, for temperature compensation in copper coils or reference point compensation of thermo-elements, etc. Also for temperature measurement and compensation of meters, instruments, integrated circuits, quartz crystal oscillators and thermocouples.in telecommunication: for temperature measurement, compensation and control and protection of mobile phones, battery pack and battery charger, etc.glass encapsulated package ntc thermistor can also be used in temperature measurement, monitoring, detection and control of medical equipment, food processing equipment, climate, etc.