Silicon temperature sensing improves on other techniques
10 September 2002
Passive Components
Silicon temperature sensors have a number of key characteristics, proven to deliver improved performance and many operational advantages when compared with competitive passive-based sensing techniques. Based on what it calls 'spreading resistance' technology, Philips Semiconductors' KTY series of silicon temperature sensors provides an attractive alternative to more conventional sensors using NTC or PTC thermistors.
Being silicon-based, the KTY families of temperature sensors offer several key benefits over passive ceramics, resulting in significantly superior performance.
* Long-term stability: Since silicon is inherently stable, KTY temperature sensors are very reliable, with a very long operating life (low drift over 450 000 operating hours).
* Positive temperature coefficient: Fail-safe operation when a system overheats.
* Virtually linear characteristics: KTY sensors have a nearly linear temperature coefficient over the complete temperature range. For applications where further linearisation is necessary, a linearisation resistor can easily be added.
* Silicon batch process technology: Silicon sensors benefit from developments in this technology, eg, in encapsulation technology, with the trend towards miniaturisation and high volume manufacture.
* Glass packages available: these allow the sensors to be used in fluids without further protection.
The Philips Semiconductors KTY families are specified according to package, nominal resistance, available tolerances and temperature range, and are available in both surface-mount (SMD) and leaded forms. The KTY81 (SOD70 - leaded package) and KTY82 (SOT23 - SMD package) families are designed using a twin-sensor technology, giving polarity independent temperature sensing. Delivered in hermetically sealed glass packages the KTY83 and KTY84 families can be used directly inside fluids like oil or water. The KTY84 is specifically designed for temperatures up to 300°C, making it ideal for applications including temperature control in exhaust systems, heating equipment and toasters.
For more information contact Mutronics (Value Added Distributor), 011 608 1460.
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