Knowledge Center
Thermoelectric Module Reliability
Thermoelectric modules do not wear out mechanically because nothing moves. They degrade through diffusion, moisture and thermal stress, and all three are addressable.
Copper Diffusion Is The Main Ageing Mechanism
The pellets are soldered to copper conductors. Over time and at temperature, copper migrates into the thermoelectric material, degrading its properties and raising the module's internal resistance.
Our effective anti-copper element diffuse technology prolongs the lifespan of our thermoelectric modules from the normal 200,000 hours to 300,000 hours, and lets them endure frequent forward and reverse pulse strikes.
That last point matters for any application that cycles between cooling and heating, because polarity reversal is exactly the duty that stresses the junctions.
Moisture Is The Second Mechanism
Water reaching the pellet array corrodes conductors and creates leakage paths. On a cold surface operating below the dew point, water is not a hypothetical.
Our vacuum anti-humidity process guards module components against water and moisture penetration, which allows applications in rigorous conditions. Silicone gel perimeter sealing is applied as standard unless you ask for an unsealed module.
Sealing the module protects the module. Managing condensation in the assembly around it is a separate and equally necessary task.
Thermal Stress And Cycling
Every thermal cycle expands and contracts the solder joints between the pellets and the conductors. Fast, deep cycles do more damage than slow, shallow ones.
Nickel and stannum electroplating and patented soldering techniques let our modules work in normal, medium and high temperature ranges, performing at maximum 139, 183, 235, 320 and 500 °C. Choosing the right class for your hot side is a reliability decision, not just a specification one.
In control terms, proportional control that modulates current is far kinder than a relay that switches full current on and off.
Mechanical Failure Is Usually Installation
Cracked ceramic plates are one of the most common field failures, and they come from uneven clamping, excessive force, shock or vibration rather than from the thermoelectric material.
Where the environment is severe, an aluminium substrate module removes this failure mode entirely, because the plate is metallic and breakage free. That is the main reason we recommend the TEA series for automotive and high vibration industrial work.
What We Do Before The Module Ships
Quality control runs from raw material procurement through crystal growth, pellet selection and module assembly to dispatch. All our products are 100 % tested and inspected, using test equipment from an American thermoelectric company.
The company has passed ISO 9001 international quality certification and SGS European Union certification, and all thermoelectric modules are RoHS compliant.
A Reliability Checklist For Your Design
- Hot side sized for the load plus the module's own electrical input, with margin on the hottest day
- Temperature class chosen for the real hot side temperature, not the nominal one
- Even clamping within the 1 MPa maximum compressive load
- Aluminium substrate where shock and vibration are significant
- Proportional control rather than hard on and off switching
- Sealing specified, and condensation managed in the surrounding assembly
- Leads strain relieved so flexing does not reach the solder joints
Related Products
Parts Mentioned In This Guide
FAQ
Frequently Asked Questions
What lifetime should I design for?
Our anti-copper element diffuse technology takes design life from the normal 200,000 hours to 300,000 hours. Actual life depends on your hot side management, thermal cycling profile and clamping.
What is the most common cause of failure?
In the field, the two leading causes are an undersized hot side, which drives every other degradation mechanism, and mechanical damage to ceramic plates from uneven clamping or vibration.
Does frequent switching damage a module?
Hard switching of full current stresses the solder joints. Proportional control that modulates the current is considerably kinder, and it also holds the set point better.
Are your modules RoHS compliant?
Yes. All EVERREDtronics thermoelectric modules are RoHS compliant, and the company holds ISO 9001 certification and SGS European Union certification.
How are modules tested?
All products are 100 % tested and inspected using test equipment from an American thermoelectric company, with quality control running from raw material procurement through to dispatch.
Reviewing A Design For Long Life
Send us the duty cycle, the hot side arrangement and the environment. We will flag the reliability risks we can see.
No forms. Messages reach our engineering desk directly. Reply within 24 hours, Monday to Friday, 9:00 to 17:00 Beijing time.