Thermoelectric Cooling Solutions

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Thermoelectric coolers

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MD04 Series of Single & Multistage TE Modules


The MD04 Series is RMT high-density Series with more than 250 different thermoelectric coolers. Single- and multistage TECs are available with cold side dimensions in a range from 1.3x2.4mm to 9.8x9.8mm. Many single-stage MD04 TECs are developed and optimized for telecom industry, especially for cooled TOSA applications. Multi-stage thermoelectric coolers from MD04 Series are common solutions for IR and X-Ray detectors cooling.

All MD04 thermoelectric coolers are RoHS compliant and qualified by Telcordia GR-468 standard. RMT improved thermoelectric material provides high performance and low power consumption. The MD04 Series has been designed for cooling and thermostabilization of Laser and Optoelectronic Devices, X-Ray, IR- instruments and Microelectronic components.

The distance between pellets (BiTe posts) inside MD04 TECs is reduced twice comparing with regular technology. This allows to fit almost twice more pellets on the same size as regular technology thermoelectric coolers have. Such solution increases TE cooler cooling capacity by 60-100%. The alternative way is in manufacturing the analogs of regular technology coolers with the same performance and 20-50% smaller sizes. It allows to reduce dimensions in final application and use another form factors (for example, switch from TO-3 header type to smaller TO-8 in detector application).

Click to enlarge. Click to enlarge. Click to enlarge.
HD pellets placement technology
Switching to smaller form factor keeping the same performance
The increasing of TEC cooling capacity without size change

TE coolers from MD04 Series are based on RMT high-density pellets placement technology with up to 27W/cm2 cooling power density. Thermoelectric coolers may have regular wires or WB terminal connection type. Al2O3 ceramics is used by default for most of MD04 Series TECs. RMT Ltd provide a wide range of manufacturing options for the most optimal integrating into final application. The table below contains all standard thermoelectric coolers from MD04 Series with performance values specified at +27ºC Vacuum and +50ºC Dry N2 conditions.

Thermoelectric coolers MD04 Series
Single stage TE Coolers
Two-stage TE Coolers
Three- and four stage TE Coolers
Performance table at 27C, vacuum.
Performance table at 50C, N2.


Please, use On-Line Assistant to find the most optimal thermoelectric cooler by dimensions and performance parameters. The detailed analysis of TEC performance and power consumption can be made with free TECCad software for Windows or special iTECPad app for iPad (available free on App Store).


  1. TEC Assempling
    1. Solder SnSb (Tmelt=230°C)
    2. Solder AuSn (Tmelt=280°C)
  2. Ceramics
    1. Pure Al2O3 (100%)
    2. Alumina Al2O3 (96%)
    3. Aluminum Nitride (AIN)
  1. Surface finish
    1. Blank ceramics (not metallized)
    2. Metallized (Au plating)
    3. Metallized and pre-tinned with:
      1. Solder 117 (InSn, Tmelt=117°C)
      2. Solder 138 (SnBi, Tmelt=138°C)
      3. Solder 143 (In-Ag, Tmelt=143°C)
      4. Solder 157 (In, Tmelt=157°C)
      5. Solder 183 (PbSn, Tmelt=183°C)
      6. Optional (specified by Customer)
  1. Thermosensor (optional)
    • Can be mounted to cold side ceramics edge. Calibration is available by request.
  2. Terminal contacts:
    1. Blank, tinned Copper
    2. Insulated Wires
    3. Insulated, color coded

Information furnished by RMT Ltd is believed to be reliable. However no responsibility is assumed for possible inaccuracies or omission. Specifications are subject to change whithout notice.