Thermoelectric Cooling Module TM 31-1.4-8.5

TM 31-1.4-8.5 Thermoelectric Cooling Module

Specifications with Thot = 27 °С

Part Number





Dimensions (mm)
L x W x H

TM 31-1.4-8.5





20 x 20 x 3.4


TM 31-1.4-8.5 is a general purpose single-stage thermoelectric module, with exceptional cooling capacity for a module powered by a 3.3V DC power source. With a 20 x 20 mm footprint and the (Qcmax) of 18.8 watts, it’s a great choice when voltage is limited and current is abundant.

TM 31-1.4-8.5 may be used for cooling, heating and thermal stabilization and is employed in a wide range of applications including including medical, analytical, laboratory & scientific instruments, electro-optics, telecommunications and military. A version for thermal cycling is available.

In electro-optic and photonic applications, TM 31-1.4-8.5 is commonly used to maintain a constant temperature in order to stabilize the wavelength of a diode, detector or sensor.

Comprehensive Specifications (Hot-Side Temperature 27 °C)

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

Vmax = 3.8 Volts (Vmax is maximum voltage at ΔTmax)

Qcmax = 18.8 Watts (Qcmax is maximum cooling capacity at Imax, Vmax and ΔT = 0 °C)

ΔTmax = 70 °C (ΔTmax is maximum temperature difference at Imax, Vmax and Qc = 0W)

Internal resistance = 0.35Ω ± 10% as measured by AC 4-terminal method at 25 °C

Operating temperature range: -50 °C ~ +200 °C (Solder melting point: +235 °C)

Thickness tolerance: ± 0.025mm (Lapping to ± 0.01mm for multi-module apps available.)
Flatness and parallel 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)
Metalized (and tinned) surfaces available

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

RoHS Compliant

Options & Designations (Suffix):
(for example: TM 31-1.4-8.5 "EL")



click drawing for enlargement

TM-31-1.4-8.5 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