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  • NC Non-Contact Sensors F-Type

    The Semitec Non Contact (NC) sensor is a new concept in measuring infrared heat for temperature control of office automation products, and other products with rotating motors

    Utilising micro FT thermistor technology, Semitec have developed a sensor which can be easily installed, is self-compensating and can withstand more aggressive environments than conventional infra-red sensors.

    The sensor assembly consists of two high-precision thermistors. One detects IR radiation emitted from an object, and the other measures the ambient temperature for compensation. By using the temperature differential between the two measurement outputs the target temperature can be calculated

    The Semitec NC Non – Contact Sensor is ideally suited for temperature control of

    • fuser rollers in laser printers, fax machines and photo-copiers,
    • rotating motor parts particularly in automotive applications
    • temperature measurement of drugs, chemicals and in high pressure environments.

    Other Key features include:

    • High resistance to dust – very little deterioration in output is caused by dirt or toner particles.
    • High heat resistance – operating temperature range is from -10°C to 150°C., measuring temperature from -20°C to 260°C.
    • Resistant to electrical noise – no special housing required in micro-wave applications.
    • Simple to use – using a thermistor sensor, the output signal output is very high and easy to process.
  • CRD Current Diodes

    These are available as either surface mount SOD323 or DO-35 diode packages

    The S-series surface-mount range offers constant current values from 0.1mA to 22mA.

    Operating temperature range  -40° to 150°C

    Semitec CRDs operate over a wide voltage range and by combining them in parallel or in series with a zener, even higher current and voltage ratings can be achieved.

  • Semitec Zenamic MOVs

    Peak current surges of up to 6500A (8/20 s) and peak power surges of up to 565J (10/1000 s) respectively can be limited by these fast-acting devices.

  • Semitec AT-2 High Accuracy NTC Thermistor

    The Semitec AT-2 range of NTC thermistors were the first to use lead-frame technology to create consistently accurate 1% tolerance NTC’s at a significant lower-cost than other NTC products. Their unified shape enables automatic assembly.

    • Lead frame technology
    • Consistent accuracy. 1% tolerance
    • Unified shape for automatic assembly.
    • Seven R25 range values
    • Stock Available ; 102AT-2, 202AT-2, 502AT-2, 103AT-2, 203AT-2,503AT-2, 104AT-2
  • Semitec AT-4 HIgh Accuracy Lead Wire NTC Thermistors

    Semitec AT-4 thermistors have flexible, PVC insulated lead-wires and so they offer all the technical benefits of the AT-2 ntc thermistor and also help to simplify the battery assembly process.
    There are two main wire gauges available (30AWG or 26AWG) with the following 10kohm versions readily available from stock;
    103AT-4-70374 (50mm 30AWG PVC leads)
    103AT-4-70261 (100mm 30AWG PVC leads)
    103AT-4-10228 (150mm 30AWG PVC leads)
    103AT-4-61046 (175mm 26AWG PVC leads)
    Call us to discuss any specific requirements.

  • Semitec AT-5 Lead In NTC Thermistor

    Semitec 103AT-5 thermistors incorporate the same NTC element as the 103AT-2 but are fitted with 30mm long solid bare lead-wires (0.5mm dia) and can be supplied in bulk form or tape & reel or ammo-pack.

    Call us to discuss any auto-insertion requirements you have for NTC thermistors.

  • Semitec AP-2 Ultra High Accuracy NTC Thermistors
    • RT curve-matched bead NTC thermistor
    • Extremely high accuracy (±0.5%) tolerances
    • Wide temperature range -60°C/+150°C
    • Rigid lead format NTC thermistor
    • Stock List: 202AP-2, 232AP-2, 502AP-2, 103AP-2, 103AP-2-A, 103APA-2, 203AP-2, 503AP-2, 104AP-2, 204AP-2
  • Semitec High Accuracy HT/HTF Mini Chip Thermistor
    • High accuracy tolerances over wide temperatures -40°C/+125°C
    • Re-flow soldering
    • SMD or SMD axial
  • Semitec High Accuracy KT SMD NTC Thermistor
    • High accuracy 1% tolerances
    • Operating range -40°C to 125° C
    • Miniature – 1mm x 0.3mm x 0.5mm
    • Re-flow soldering
    • High levels of performance and reliability
  • Semitec Epoxy-Coated Temperature Sensors

    This is one of the simplest forms of thermistor sensor available.

    The NTC element is first soldered to lead-wires and then encapsulated in several layers of epoxy to provide an environmental seal and mechanical protection.
    A wide range of single-insulated, fully encapsulated sensors are available utilising our AP-2, AT-2, ET, NT-4 or SP series thermistors, offering you a wide range of R25 and B values.

    • Offers up to IP67 waterproof protection.
    • Temperature range: -50/+110°C (125°C)
    • Epoxy-coating Cable length: 50mm to 10 metres


  • AT-11 Temperature Sensors

    The AT-11 is a TPE encapsulated sensor suitable for temperatures from -50°C/+110°C. The sensing portion is just 5mm x 6mm x 15mm long giving a fast response to thermal change. The sensor tip is sealed to the leadwires during the moulding process to ensure IP67 integrity and so can be used where moisture ingress is normally a problem – this overmoulding also helps to provide an insulation strength to 3.75kV.
    The industry standard 103AT-11 uses our highly reliable 103AT-2 thermistor (accuracy ±0.3°C at 25°C) and we stock the 600mm, 1.5m and 3m long versions. Other R25/B value combinations using our AT-2 and AP-2 series thermistors are also available for volume applications.

  • Semitec 103AT-11 IP67 Temperature Sensors

    Semitec AT-11 thermistor sensors are TPE encapsulated sensors suitable for temperatures from -50°C/+110°C, and offers excellent and accurate low-cost solution for general temperature sensing applications.

    • Fast response to thermal change – sensing portion 5mm x 6mm x 15mm
    • Sensor tip is sealed to the lead wires during the moulding process to ensure IP67 integrity – can be used where moisture ingress is normally a problem
    • Insulation strength to 3.75kV
    • Uses our highly reliable 103AT-2 thermistor (accuracy ±0.3°C at 25°C)
    • Other R25/B value combinations using our AT-2 and AP-2 series thermistors are also available for volume applications

    Available from stock is the standard 600mm long 103AT-11, as well as 1.5m and 3m long versions.

  • Semitec NT-4 Glass Bead NTC Thermistor
    • NEW – Superior performance replacing Semitec GT-2
    • High temperature resistance -50°C/+300°C
    • Faster response times
    • Moisture resistance
    • Small 1.25mm bead diameter, with lead in
  • Semitec F-micro Miniature Temperature Sensors

    Using further advances in Semitec’s thin-film thermistor technology, the Fμ temperature sensor has been specifically designed with medical purposes in mind.

    Now available in packages as small as 0.3mm (D) x 1.8mm (L) with a Tc≤20ms.

    The Fμ temperature sensor can be used in catheters, body temperature monitoring devices or where an extremely small sensor needs to be incorporated with other clinical instruments.

    • 2 stock items available:
      • Probe size – 0.5mm (D) x 2.3mm (L)   Tc≤52ms
      • Probe size – 0.3mm (D) x 1.8mm (L)   Tc≤20ms
    • Fast response time
    • Highly accurate ±0.14K at 37°C
    • Operating temperature range is -10/+70°C
    • Laser Trimming of ladder- electrodes
    • Glass encapsulation

    Typical Applications include:

    • Medical Catheters
    • Handheld Medical Devices
    • Body Temperature Monitoring
    • Guide Wires
    • Testing Equipment


  • Semitec JT Ultra-Thin Flexible Film NTC Thermistor

    Semitec’s JT series of thermistors are ultra-thin flexible film NTCs that give a very fast response to temperature change.  Whilst increasingly used within medical device applications, it is a versatile thermistor which is used within battery packs, mobile devices and surface/air  temperature sensors.

    • One of thinnest available worldwide -less than 0.5mm thick.
    • Laminated within 2 polymer layers – flexible yet resilient.
    • Operating range -50°C/+125°C
    • Very fast response times.
    • Standard R25 values are 10kohms and 100kohms with lengths of 25mm, 50mm, 75mm and 100mm.

    Stock parts include :  103JT-025, 103JT-050, 104JT-025 and 104JT-050.

  • Semitec STS1 IP67 Clip-on Pipe Temperature Sensors

    IP67 rated pipe-clip temperature sensor from Semitec. Ideal for gas-boilers, instant water heaters and anti-legionnaires monitoring systems.

    • Fast and accurate response (Tcs≤ 1s)
    • Suitable for pipe diameter 12-22mm.
    • Operating range -20°C/+120°C
  • Semitec ET Miniature Epoxy NTC Thermistor

    Originally designed for clinical thermometer applications this small beaded NTC thermistor is very versatile and suitable for wide range of applications.

    R37 tolerances of ±1% or smaller and matched resistance groups help to minimise unit cost whilst maximising sensor accuracy.

    • Operating range -40°C/+100°C
    • Highly accurate – fast response
    • Small epoxy bead size <1.6mm


  • Semitec FL/FT Glass Film High Temperature SMD Thermistor
    • SMD glass film high temperature  NTC thermistor
    • Thin film technology ensures exceptionally fast response times, and moisture resistance.
    • High Temperature resistance -50°/+250~350°C
    • Available  either in SMD or SMD axial format
  • Semitec ET-3H Small Bead Epoxy NTCs

    The ET-3H thermistor was originally developed for clinical thermometer applications.
    With bead sizes of 1.4mm (or less), its fast response and high accuracy make it a universal choice for low-cost, clinical thermometers.
    R37 tolerances of ±1% or smaller and matched resistance groups help to minimise unit cost whilst maximising sensor accuracy.

  • Semitec STS3 Thin Flexible Film Temperature Sensor

    A flexible JT film thermistor assembly from Semitec fitted with lead-wires and connector.

    This versatile temperature sensor is ideal for air-sensing, particularly for use in fire alarms and heat detectors, component and battery monitoring, rechargeable batteries and medical sensors.

    • Fast response design (Tc ≤ 1s)
    • High accuracy ±1%
    • Flexible sensing tip
    • Interchangeability between NTCs
    • Operating range up to -40°C /+125°C
  • Semitec STS4 Flexible Surface Sensor for High Temperatures

    High temperature  flexible thermistor suitable for use in sensing high surface temperatures up-to 250°C.

    Typical applications include use in- laser-printers; photo-copiers; fax machines etc; hot plates and appliances.

    • Fast response design (Tc ≤ 1s)
    • High accuracy ±3%
    • Flexible sensing tip
    • Operating range up to 230°C
    • Excellent long term stability


  • Thermopiles - Non-Contact Infrared Sensors

    Our Semitec 10TP series thermopile is a very fast-acting infrared sensing device suitable for non-contact applications such as clinical ear-drum thermometers.
    The  Semitec 10TP583T thermopile is the result of silicon micro-machining technology where a series of miniature thermocouple junctions are combined to provide an output EMF based on the received infrared energy.

    • Operating temperature range is from -10°C to 100°C