TM2 40-40-8.5
ElectraCOOL™ (2-Stage) TE Cooler

TM2 40-40-8.5
ElectraCOOL™ 2-Stage Thermoelectric Cooling Module

Specifications with Thot = 27 °С

Part Number





Dimensions (mm)
Stage 1 L x W, Stage 2 L x W (total height)

TM2 40-40-8.5





40 x 40, 40 x 40 (7.05)


TM2 40-40-8.5 is a two-stage TE Cooler with a cold-side as large as the hot-side. That provides a large surface area for cooling with a fabulous 85 °C ∆Tmax and over 50 watts of cooling capacity.

The ∆Tmax actually increases to 95 °C with a Thot of 50 °C.

When a conventional single-stage module simply can’t get the job done, this may be the solution.

With a Qmax of 51.6 watts the module capable of cooling a singnificant load. At full power, with a maximum load, this module will have a significant load to heat-sink. It’s likely a forced convection or liquid heat-sink will be required to achieve the desired performance.

To cover a large area, this module is available in pre-wired and (epoxy) sealed strings, of your design or ours (2-12 modules long).


Comprehensive Specifications (Hot-Side Temperature 27 °C)

Imax = 8.5 Amps (Imax is the maximum current at ΔTmax)

Vmax = 16.1 Volts (Vmax is maximum voltage at ΔTmax)

Qcmax = 51.6 Watts (Qcmax is maximum cooling capacity at Imax, Vmax and ΔT = 0 °C)

ΔTmax = 85 °C (ΔTmax is maximum temperature difference at Imax, Vmax and Qc = 0W)

Internal resistance = 1.65 Ω ± 10% as measured by AC 4-terminal method at 25 °C (1R65)

Operating temperature range: -50 °C ~ +105 °C (Solder melting point: +138 °C)

Thickness tolerance: ± 0.2mm
Flatness variance: ± 0.05mm

Operating temperature range: -50 °C ~ +105 °C (Solder melting point: +138 °C) Thickness tolerance: ± 0.2mm
Flatness variance: ± 0.05mm

Standard lead wires: 20 AWG, Tin (Sn) plated at module interface, with a maximum temperature of +105 °C
(Other wiring options available.)

Maximum recommended compression: 1MPa

Ceramics: Alumina (AL2O3)

The lot number is printed on the center of the cold-side



click drawing for enlargement

2 Stage TM2 40-40-8.5 Small Module Drawing  

Dimensions in mm


Useful Links


Please contact us for a quotation. or (603) 888-2467.


Performance Curves (click image for enlargement)

Thermoelectric module performance curves are graphical representations showing the relationships between power applied and net cooling for a specific TE module.

Performance curves are valuable tools for quickly determining if a TE module is a suitable COOLER for an application; learning what power is required for an appropriate module to reach the desired temperature and heat pumping capacity; and to provide the basic information necessary for proper assembly design.

Curves with Th = 27 °C indicate what to expect operating in ambient temperatures around 20 °C (70 °F) with an operational "hot-side" temperature or Th about 7 °C above ambient.

Curves with Th = 50 °C are for outdoor, box-in-box, and other applications with ambient temperatures in the 40-50 °C range.

Toll free in North America: 1 866.665.5434

International: 603.888.2467