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Semitec FT – Our Smallest and Fastest NTC Thermistor

When an application requires thermistors with a rapid response time – the Semitec FT micro thin film SMD thermistor can be regarded as the gold standard. As one of the world’s thinnest temperature sensors, the Semitec FT outperforms similar products due to their miniature size, exceptionally fast response time and high heat resistance.  

Semitec Glass Film SMD Thermistor


One of their primary uses is the thermal protection of IGBT junction temperatures, especially when they are used in e-vehicle and other high-power applications. Their unique construction and miniature form (down to 0201) enables the FT to be placed closer to IGBT junctions. There it can quickly sense rapid changes in temperature, maximising the IGBT’s performance and lifetime. The miniature size also enables use in digital thermometers, medical devices and “in-cell” battery monitoring.

Fast response

Semitec’s FT thermistor is at the forefront of NTC thermistor technology. Using thin-film sputter technology, the FT thermistor is manufactured on 150micron (or thinner) ceramic substrates. The primary benefit of this is the very fast thermal response the FT exhibits when mounted onto a heating element or power component surface. The thermal time constant can be less than 0.5 sec for the smallest 0201 package.

High, wide temperature range

In addition, the FT’s wide and ‘useable’ temperature range of -50°C/+350°C (which is a distinct advantage over other NTC thermistors) offers opportunities in applications such as office automation (i.e. laser printers, photocopiers), personal care appliances, laser equipment and security devices.

Laser trimmed & moisture resistant

Used in many different industries, the FT thermistor can be laser-trimmed to very high accuracy for use as temperature sensors in applications such as catheters for medical applications. Its glass passivation layer helps seal it against moisture ingress.

For ease of manufacturing, the FT can be supplied with axial leads which can be laser-welded to the control or sensing circuit. A radial leaded version allows standard soldering techniques to be used in digital thermometers or other temperature critical applications.

FT Line Drawing

Key Features

• Thin film technology ensures exceptionally fast response times,

• Glass passivation ensures moisture resistance.

• High temperature performance -50°C/+350°C

• Extremely thin (< 0.15mm possible)

• Miniature footprint (0.2 x 0.1mm available)

• Interchangeable/RT matched versions

• Highly accurate – to ± 0.2°C (0–70°C) or better

Wide range of temperature sensors available

Semitec’s FT thin film SMD NTC is part of a large range of temperature sensors available from ATC Semitec. 

ATC Semitec are one of the UK’s leading thermal management component distributors, offering engineers in depth technical advice for their NPD projects. Click here for our full range of SMD NTC thermistors