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TEC Elements, Resistive Heaters, Thermistors, and Thermocouples

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TEC Elements, Resistive Heaters, Thermistors, and Thermocouples


Thorlabs offers a wide range of thermal management accessories, including thermoelectric coolers, resistive heaters, thermistors, and temperature transducers. Thermoelectric coolers are ideal for total and precise temperature regulation. These devices can both cool and heat, allowing for quick response to thermal drift or shock. For applications that require only heating or steady-state regulation slightly above room temperature, resistive heaters are a reliable and easily regulated heat source. Regardless of application, temperature monitoring is essential for any temperature regulation system. Thorlabs' thermistors and thermocouples provide precise and accurate temperature measurements.

We offer three different thermoelectric coolers (TEC3-2.5, TEC3-6, and TEC1.4-6), all of which are ideal for medium to large heat-pumping applications. These work well with both our TED200C 12 W Benchtop Laser Diode Temperature Controller and our rack-mountable temperature controllers, which are compatible with the PRO800 Chassis. When using a TEC for thermal regulation, care should be taken to electrically isolate both sides of the TEC.

Thorlabs offers three types of resistive heaters: foil, cartridge, and metal ceramic. The HT10K and TLK-H are resistive foil heaters with a pressure-sensitive adhesive backing and a 10 kΩ NTC thermistor integrated directly onto the heater. The HT15W is a miniature 15 W cartridge heater, which can be used for many applications requiring small areas to be heated. Our metal ceramic heaters come in either round (HT19R) or square (HT24S and HT24S2) geometries and provide fast thermal response. These small but high powered heaters are ideal for thermal regulation of optical components. All of the heaters sold here are compatible with Thorlabs' TC200 temperature controller.

We also offer three models of thermistors and temperature transducers. The TH10K is a 10 kΩ thermistor with 1 °C accuracy that is meant to be used in common TEC applications. The TH100PT is a 100 Ω platinum Resistance Temperature Detector (RTD) with a positive linear temperature response. These thermistors are compatible with the TC200 temperature controller. Finally, the AD590 is an integrated circuit (IC) temperature transducer with an output current that is proportional to absolute temperature. All our thermistors and AD590 temperature transducers are compatible with the TED200C 12 W Benchtop Laser Diode Temperature Controller and our rack-mountable temperature controllers. For high temperature applications, constantan or manganese wires may be used.

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Posted Comments:
Poster: myanakas
Posted Date: 2014-05-20 09:06:31.0
Response from Mike at Thorlabs: Thank you for your feedback. The temperature range for the HT10K and TLK-H is -32 to 100 °C (-26 to 212 °F). Based on your feedback this specification has been added to the web presentation for these parts.
Poster: curtis.volin
Posted Date: 2014-05-19 15:07:42.88
I don't see a maximum temperature spec on HT10K or TLK-H. Can you provide this information?
Posted Date: 2014-01-27 04:25:16.06
What is the maximum operational temperature for the HT19R heater element? The heater element HT19R ships with a note saying the maximum is 180 C, while the data sheet online says 400 C.
Poster: sharrell
Posted Date: 2014-01-27 09:43:26.0
Response from Sean at Thorlabs: Thank you for your pointing out this inconsistency. 400 °C is the correct maximum temperature specification. It appears that the item shipped with an older, incorrect version of the spec sheet; we are working with the production team to get the items in inventory corrected now.
Poster: jlow
Posted Date: 2012-12-11 17:01:00.0
Response from Jeremy at Thorlabs: The leads on the HT10K are about 13".
Poster: cbrideau
Posted Date: 2012-12-11 16:05:54.117
How long are the leads on the HT10K? Or can you just solder on your own?
Poster: tcohen
Posted Date: 2012-10-15 09:25:00.0
Response from Tim at Thorlabs: Thank you for your feedback. We will add the cable as a standalone item shortly (with HIROSE connectors for mating with TC200). For immediate assistance with a compatible cable, please contact us at
Poster: cpinyan
Posted Date: 2012-10-10 12:58:44.463
Would be great if Thorlabs also sold connecting cable (connector one end and alligator or other quick clips on other end) to go between Thermistor, heating elements and one of the standard temperature controllers.
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TEC Elements
Item # TH = 27 °CTH = 35 °CTH = 50 °CAC Resistance
Imax Qmax Vmax Tmax Qmax Vmax Tmax Qmax Vmax Tmax @27 °C
TEC3-2.5 2.5 A 6 W 3.6 V 65 °C 6 W 3.8 V 68 °C 6 W 4.1 V 73 °C 1.2 Ohm
TEC3-6 5.6 A 13 W 3.6 V 65 °C 14 W 3.8 V 68 °C 14 W 4.1 V 73 °C 0.5 Ohm
TEC1.4-6 6.0 A 6 W 1.8 V 65 °C - - - 7 W 1.9 V 75 °C 0.3 Ohm
TEC Dimension Drawing
Click to Enlarge
TEC Element Dimensional Drawing
Item #Dimensions
TEC3-2.5 0.807"
(20.5 mm)
(16.0 mm)
(16.0 mm)
(4.0 mm)
TEC3-6 0.965"
(24.5 mm)
(20.0 mm)
(20.0 mm)
(4.0 mm)
TEC1.4-6 0.560"
(14.2 mm)
(14.2 mm)
(14.2 mm)
(3.8 mm)
(5.0 mm)

Performance values of the TEC are given above as a function of TH, the temperature of the hot surface of the TEC. Imax is the maximum allowed current across the TEC element and Vmax is the maximum allowed voltage difference. These values should not be exceeded. Qmax is the maximum heat load that the TEC can handle; Tmax is the maximum temperature difference between the hot and cold surfaces of the TEC in a dry nitrogen environment.

When choosing a TEC, it is important to know the heat load of the system (how much heat must be transferred away from the device) and to match that load with a capable TEC. The TEC should be rated for a maximum heat load above that which is emitted by the system. Proper thermal contact is necessary for optimal heat transfer. Ensuring that the TEC is of proper size for the system is important as well as using thermal tape or grease to help facilitate heat transfer. It is important to note that the heat transfer efficiency is affected by the ambient environment. Large changes in background temperature or significant humidity can hamper heat flow. These factors should be taken into account when choosing an appropriate TEC.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
TEC3-2.5 Support Documentation
TEC3-2.5 2.5 A TEC Element
TEC3-6 Support Documentation
TEC3-6 5.6 A TEC Element
TEC1.4-6 Support Documentation
TEC1.4-6 6.0 A TEC Element
Flexible Resistive Foil Heaters
Heated lens Tube
Click for Details

SM1L10 Lens Tube Heated with a TH10K Foil Heater.
Item #HT10KTLK-H
Heater Resistance 19.7 Ohms
Sensor Type NTC10K Thermistor
Heating Capacity 10 W/in2 (0.016 W/mm2) @ 70 °C
Size 1" x 3" (25.4 mm × 76.2 mm)
Effective Heating Area 2.23 in2 (1438.7 mm2)
Minimum Bend Radius 0.5" (12.7 mm) in Thermistor Area,
0.030" (0.8 mm) in All Other Areas
Temperature Range -32 to 100 °C (-26 to 212 °F)
Connector Type Bare Wire Leads 6-Pin Hirose
  • Kapton (Polyimide) Foil Heaters with Integrated Thermistors
  • 1" x 3" (25.4 mm x 76.2 mm) Heating Area
  • Adhesive Backing for Easy Installation
  • TLK-H has a 6-Pin Hirose Connector for Direct Compatibility with our TC200 Heater Controller
  • 10 W/in2 (0.016 W/mm2) Heating Capacity

These 1" x 3" (25.4 mm x 76.2 mm) foil heating elements are useful for many lab applications. They have an integrated thermistor for closed-loop temperature control and an acrylic pressure-sensitive adhesive backing for easy installation. Both models use the same heating element and are compatible with our TC200 temperature controller. Additionally, the TLK-H includes a 6-pin hirose connector for direct connection to the TC200 with no soldering. Both heaters are flexible for use in applications such as heating lens tubes, as shown in the photo to the right. In this application, the lens tube can be isolated from the rest of the system using a Thermally Insulating Adapter.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
HT10K Support Documentation
HT10K Flexible Polyimide Foil Heater with 10 kOhm Thermistor
TLK-H Support Documentation
TLK-H Flexible Polyimide Foil Heater with 10 kOhm Thermistor and 6 Pin Hirose Connector
Resistive Cartridge Heater
Item #HT15W
Heater Resistance 38.4 Ohm ± 10%
Size Ø1/8" x 1/2" (Ø3.2 mm × 12.7 mm)
Heating Capacity 15 W @ 24 V, 3.8 W @ 12 V, 0.90 W @ 6 V
Maximum Temperature 315 °C (600 °F)a
Connector Type Bare Leads
  • When installed in a Ø1/8" (Ø3.2 mm) bore in a metal block. The lead exits of the heater are insulated with a Teflon (PTFE) end cap. While the heater body may be operated at higher temperatures, the Teflon cap should never exceed 260 °C (500 °F).
  • General Purpose Cartridge-Type Resistive Heater
  • Compact Ø1/8" x 1/2" (Ø3.2 mm × 12.7 mm) Cylindrical Package
  • 15 W Maximum Heating Power

The HT15W is a 15 W cartridge-shaped resistive heater. It is compatible with our TC200 temperature controller.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
HT15W Support Documentation
HT15W 15 W Resistive Cartridge Heater, Ø1/8" x 1/2" (Ø3.2 mm x 12.7 mm)
Metal Ceramic Heaters
Item #HT19RHT24SHT24S2
Heater Power 19 W @ 24 V
4.8 W @ 12V
1.2 W @ 6 V
24 W @ 24 V
6.1 W @ 12 V
1.5 W @ 6 V
Heater Resistance 30 Ohm ± 10% 23.5 Ohm ± 10%
Dimensions Ø0.906" (23.0 mm) O.D.
Ø0.157" (4.0 mm) I.D.
0.787" (20.0 mm) Square 1.143" (28.0 mm) Square
Dimensional Tolerance ±0.02" (0.5 mm) O.D.
±.004" (0.1 mm) I.D.
±0.02" (0.5 mm) ±0.02" (0.5 mm)
Thickness 0.05" (1.3 mm) 0.07" (1.7 mm)
Thickness Tolerance ±0.002" (0.05 mm) ±0.002" (0.05 mm)
Lead Length 1.97" (50.0 mm)
Max Temperature 400 °C
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
HT19R Support Documentation
HT19R 19 W, Ø23 mm Metal Ceramic Heater
HT24S Support Documentation
HT24S 24 W, 20 mm x 20 mm Metal Ceramic Heater
HT24S2 Support Documentation
HT24S2 24 W, 28 mm x 28 mm Metal Ceramic Heater
Thermistors and Thermocouples
Linear Current Output 1 µA / K
Operating Range -55 °C to 150 °C
Power Supply Range 4 to 30 V
Bottom View
(Click to Enlarge)
AD590 Bottom View
Temp. Accuracy ±1 °C
Dissipation Constant 1.4 mW/°C
Time Constant 15 s
Operating Range -50 to
150 °C
Temp. Coefficient -4.40 %/°C
  • @ 25 °C. We also offer an Excel file which quickly calculates measured resistance for a given temperature or temperature for a measured resistance.
Rating A100 Ohm @ 0 °C
Temp. Coefficient 3.85 x 10-3 / K
Accuracy Class B Tolerance
(±0.3 °C @ 100 Ohm)
Operating Range -70 to 400 °C
(-94 to 752 °F)
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
AD590 Support Documentation
AD590 Temperature Transducer
TH10K Support Documentation
TH10K 10 kOhm Thermistor
TH100PT Support Documentation
TH100PT 100 Ohm Platinum Resistance Temperature Detector
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Last Edited: Mar 17, 2014 Author: Dave Gardner