Technician working on telecommunications equipment on a tower

Thermoelectric Modules

TES Micro Thermoelectric Modules

Where the cold plate is a few millimetres across. TES1 modules use P/N couples from 0.45×0.45 mm, packing more couples into a small footprint so a low current supply can still hold a useful delta-T.

90 part numbersPellets from 0.45 mmImax 0.8 - 6.0 AFootprints from 1.8 mmRound sizes available

Product Overview

More Couples In Less Area

The TES series, also called micro thermoelectric modules, is built with electric elements (P/N couples) sized 0.45×0.45 mm, 0.6×0.65 mm, 0.9×0.9 mm and 1.0×1.0 mm, all under one square millimetre. Smaller couples allow more of them inside a limited module size.

Through our fine mount and assembly technique the quality is well controlled, which assures stable and sound performance in the application. TES modules suit cooling and heating applications where a small footprint or a small amount of heat is involved.

Typical applications include laser diode cooling, infrared systems, electro-optics and electronic equipment, and other low wattage or low current applications. Round modules with an outer and inner diameter are also listed in the catalogue for annular optics mounts.

Outline drawing of a thermoelectric module showing width, length and height dimensions

Key Benefits

Built For Small, Sensitive Loads

Footprints From 1.8 mm

The smallest catalogue code measures 1.8×3.4 mm on the cold side, small enough to sit directly under a TO can or a laser submount.

Low Current Operation

Imax from 0.8 A means a TES module can be driven by a small linear or PWM driver without a dedicated supply.

Stepped And Round Outlines

Cold and hot faces can differ in size for easier mounting, and round modules with OD and ID are catalogued for annular assemblies.

Who It Is For

Engineers Who Specify This Series

Photonics teams cooling laser diodes and holding the emission wavelength stable
Infrared and night vision designers cooling detectors and black body reference sources
Electro-optics and CCD or CID camera builders removing dark current by lowering sensor temperature
Instrument designers who have millimetres, not centimetres, of space on the cold plate
Sensor makers who need a small heat pump that can also warm the element on demand

Problems It Solves

What This Module Solves

The available cold plate is too small for any standard module footprint
Only a low current rail is available and a 6 A module cannot be driven
The detector needs a stable temperature, not just a lower one, so the loop must be fine grained
The optical path needs an annular module so the beam can pass through the centre
Cold and hot side mounting surfaces are different sizes and a stepped module simplifies the build

Technical Features

Micro Module Construction

Sub Millimetre Pellets

P/N couples of 0.45×0.45, 0.6×0.65, 0.9×0.9 and 1.0×1.0 mm, each under 1 mm².

Fine Mount Assembly

A special fine placement and assembly technique keeps the pellet array uniform, which is what makes small modules repeatable.

Stepped Outlines

Many codes have a cold side (W₁, L₁) smaller than the hot side (W₂, L₂) so the module can be clamped outside the cooled area.

ΔTmax 63 to 67 °C

The same temperature differential as the larger series, measured at Qc = 0, Imax and Th = 30 °C.

0.22 to 101 W Qmax

The catalogue spans nearly three orders of magnitude, so one series covers a detector and a small cold plate.

Same Sealing And Plating

Nickel and stannum electroplating, vacuum anti-humidity process and RoHS compliance apply to the TES series too.

Specifications

Full TES1 Catalogue

Round modules are marked with an asterisk in the source data. For those rows OD is the outer diameter and ID the inner diameter.

90 / 90

ITEM	Product Code	Imax (A)	ΔTmax (°C)	Vmax (V)	Qmax (W)	W₁ (mm)	L₁ (mm)	W₂ (mm)	L₂ (mm)	H (mm)	Datasheet
1	TES1-00708	0.8	≥63	0.85	0.38	3.4	3.4	3.4	3.4	2.4	On request
2	TES1-01108	0.8	≥63	1.33	0.60	3.4	5.0	3.4	5.0	2.4	On request
3	TES1-01708	0.8	≥63	2.00	0.92	5.0	5.0	5.0	5.0	2.4	On request
4	TES1-03108	0.8	≥63	3.75	1.67	6.6	6.6	6.6	6.6	2.4	On request
5	TES1-12708	0.8	≥65	15.00	7.00	20	20	20	20	2.9	On request
6	TES1-00408	0.8	≥63	0.48	0.22	1.8	3.4	1.8	5.1	2.4	On request
7	TES1-00808	0.8	≥63	0.97	0.43	3.4	3.4	3.4	5.1	2.4	On request
8	TES1-01208	0.8	≥63	1.45	0.65	3.4	5.0	3.4	6.7	2.4	On request
9	TES1-01808	0.8	≥63	2.18	0.97	5.0	5.0	5.0	6.7	2.4	On request
10	TES1-03208	0.8	≥63	3.87	1.72	6.6	6.6	6.6	8.3	2.4	On request
11	TES1-00712	1.2	≥63	0.85	0.57	4.2	4.2	4.2	4.2	2.7	On request
12	TES1-01112	1.2	≥63	1.33	0.89	4.2	6.2	4.2	6.2	2.7	On request
13	TES1-01712	1.2	≥63	2.00	1.38	6.2	6.2	6.2	6.2	2.7	On request
14	TES1-03112	1.2	≥63	3.75	2.51	8.3	8.3	8.3	8.3	2.7	On request
15	TES1-12712	1.2	≥65	15.00	10.00	20	20	20	20	3.4	On request
16	TES1-00412	1.2	≥65	0.48	0.32	2.2	4.2	2.2	6.3	2.7	On request
17	TES1-00812	1.2	≥65	0.97	0.65	4.2	4.2	4.2	6.3	2.7	On request
18	TES1-01212	1.2	≥65	1.45	0.97	4.2	6.2	4.2	8.2	2.7	On request
19	TES1-01812	1.2	≥65	2.18	1.46	6.2	6.2	6.2	8.3	2.7	On request
20	TES1-03212	1.2	≥65	3.87	2.59	8.3	8.3	8.3	10.4	2.7	On request
21	TES1-00715A	1.5	≥63	0.82	0.71	4.2	4.2	4.2	4.2	2.4	On request
22	TES1-01115	1.5	≥63	1.33	1.11	4.2	6.2	4.2	6.2	2.4	On request
23	TES1-01715A	1.5	≥63	2.00	1.72	6.2	6.2	6.2	6.2	2.4	On request
24	TES1-03115A	1.5	≥63	3.75	3.13	8.3	8.3	8.3	8.3	2.4	On request
25	TES1-12715A	1.5	≥65	15.00	13.50	20	20	20	20	3.1	On request
26	TES1-00415	1.5	≥63	0.48	0.40	2.2	4.2	2.2	6.3	2.4	On request
27	TES1-00815	1.5	≥63	0.97	0.81	4.2	4.2	4.2	6.3	2.4	On request
28	TES1-01215	1.5	≥63	1.45	1.21	4.2	6.2	4.2	8.2	2.4	On request
29	TES1-01815	1.5	≥63	2.18	1.82	6.2	6.2	6.2	8.3	2.4	On request
30	TES1-03215	1.5	≥63	3.87	3.23	8.3	8.3	8.3	10.4	2.4	On request
31	TES1-00715B	1.5	≥64	0.82	0.70	8.0	8.0	8.0	8.0	4.2	On request
32	TES1-01715B	1.5	≥64	2.00	1.75	12	12	12	12	4.2	On request
33	TES1-03115B	1.5	≥64	3.66	3.20	15	15	15	15	4.2	On request
34	TES1-04915	1.5	≥64	5.78	5.10	20	20	20	20	4.2	On request
35	TES1-06315	1.5	≥66	6.90	6.60	15	30	15	30	4.2	On request
36	TES1-07115	1.5	≥66	8.40	7.40	23	23	23	23	4.2	On request
37	TES1-12715B	1.5	≥67	15.00	13.30	30	30	30	30	4.2	On request
38	TES1-12715C	2.0	≥66	15.00	20.00	30	30	30	30	4.5	On request
39	TES1-12717	1.8	≥66	15.00	17.00	30	30	30	30	4.4	On request
40	TES1-00720	2.0	≥63	0.82	0.95	4.2	4.2	4.2	4.2	2.2	On request
41	TES1-01120	2.0	≥63	1.33	1.49	4.2	6.2	4.2	6.2	2.2	On request
42	TES1-01720	2.0	≥63	2.00	2.30	6.2	6.2	6.2	6.2	2.2	On request
43	TES1-03120	2.0	≥63	3.75	4.18	8.3	8.3	8.3	8.3	2.2	On request
44	TES1-06320	2.0	≥65	6.90	8.50	12.3	24.7	12.3	24.7	3.7	On request
45	TES1-12720A	2.0	≥65	15.00	16.90	20	20	20	20	2.9	On request
46	TES1-00420	2.0	≥63	0.48	0.54	2.2	4.2	2.2	6.3	2.2	On request
47	TES1-00820	2.0	≥63	0.97	1.08	4.2	4.2	4.2	6.3	2.2	On request
48	TES1-01220	2.0	≥63	1.45	1.62	4.2	6.2	4.2	8.2	2.2	On request
49	TES1-01820	2.0	≥63	2.18	2.43	6.2	6.2	6.2	8.3	2.2	On request
50	TES1-03220	2.0	≥63	3.87	4.31	8.3	8.3	8.3	10.4	2.2	On request
51	TES1-12720B	2.0	≥66	15.00	16.00	25	25	25	25	4.2	On request
52	TES1-00721	2.1	≥63	0.82	1.00	6.0	6.0	6.0	6.0	3.4	On request
53	TES1-01721	2.1	≥63	2.00	2.40	9.0	9.0	9.0	9.0	3.4	On request
54	TES1-03121	2.1	≥63	3.66	4.40	12	12	12	12	3.4	On request
55	TES1-06321	2.1	≥65	6.90	9.00	12.3	24.7	12.3	24.7	3.4	On request
56	TES1-07121	2.1	≥65	8.40	10.00	18	18	18	18	3.4	On request
57	TES1-00725	2.5	≥64	0.82	1.20	8.0	8.0	8.0	8.0	4	On request
58	TES1-01725	2.5	≥64	2.00	2.90	12	12	12	12	4	On request
59	TES1-03125	2.5	≥64	3.66	5.30	15	15	15	15	4	On request
60	TES1-04925	2.5	≥64	5.78	7.90	20	20	20	20	4	On request
61	TES1-06325	2.5	≥66	6.90	10.60	15	30	15	30	4	On request
62	TES1-07125	2.5	≥66	8.40	12.00	23	23	23	23	4	On request
63	TES1-12725B	2.5	≥66	15.00	21.40	25	25	25	25	3.7	On request
64	TES1-12725	2.5	≥66	15.00	21.40	30	30	30	30	4	On request
65	TES1-24125	2.5	≥66	28.80	32.00	40	40	40	40	4	On request
66	TES1-00730	3.0	≥65	0.82	1.40	8.0	8.0	8.0	8.0	3.6	On request
67	TES1-01730	3.0	≥65	2.00	3.40	12	12	12	12	3.6	On request
68	TES1-03130	3.0	≥65	3.66	6.30	15	15	15	15	3.6	On request
69	TES1-04930	3.0	≥65	5.78	9.50	20	20	20	20	3.6	On request
70	TES1-06330	3.0	≥66	6.90	12.70	15	30	15	30	3.6	On request
71	TES1-07130	3.0	≥66	8.40	14.00	23	23	23	23	3.6	On request
72	TES1-12730B	3.0	≥66	15.00	25.60	25	25	25	25	3.4	On request
73	TES1-12730	3.0	≥66	15.00	25.60	30	30	30	30	3.6	On request
74	TES1-11930*	3.0	≥66	14.00	24.00	OD=30	/	ID=5.0	/	3.6	On request
75	TES1-04930*	3.0	≥64	5.80	10.00	OD=26	/	ID=10	/	3.6	On request
76	TES1-00740	4.0	≥64	0.82	1.80	8.0	8.0	8.0	8.0	3.2	On request
77	TES1-01740	4.0	≥64	2.00	4.50	12	12	12	12	3.2	On request
78	TES1-03140	4.0	≥64	3.66	8.20	15	15	15	15	3.2	On request
79	TES1-04940	4.0	≥64	5.78	12.40	20	20	20	20	3.2	On request
80	TES1-06340	4.0	≥66	6.90	16.60	15	30	15	30	3.2	On request
81	TES1-07140	4.0	≥66	8.40	18.70	23	23	23	23	3.2	On request
82	TES1-12740	4.0	≥66	15.00	33.40	30	30	30	30	3.2	On request
83	TES1-03150	5.0	≥64	3.66	10.50	15	15	15	15	3.2	On request
84	TES1-04950	5.0	≥65	5.78	16.60	20	20	20	20	3.2	On request
85	TES1-06350	5.0	≥66	6.90	21.00	15	30	15	30	3.2	On request
86	TES1-07150	5.0	≥66	8.40	24.00	23	23	23	23	3.2	On request
87	TES1-12750	5.0	≥66	15.00	43.00	30	30	30	30	3.2	On request
88	TES1-24150	5.0	≥66	28.80	80.00	40	40	40	40	3.2	On request
89	TES1-12760	6.0	≥66	15.00	50.00	30	30	30	30	2.8	On request
90	TES1-24160	6.0	≥66	28.80	101.00	40	40	40	40	2.8	On request

Catalogue Notes

Data reference	All catalogue values are measured at a hot side temperature Th = 30 °C
Flatness	±0.05 mm
Height tolerance	±0.2 mm
Maximum compressive load	1 MPa
Lead wire	150 mm as default, other lengths and terminations on request
Sealing	Silicone gel seal. Specify if you do not want the module sealed

Symbol Definitions

Imax	Maximum input current in amperes at Qc = 0 and ΔTmax
Vmax	Maximum DC input voltage in volts at Qc = 0 and Imax
ΔTmax	Maximum temperature differential in °C at Qc = 0 and Imax
QcMax	Maximum heat pumping capacity in watts at Imax and ΔT = 0
Th	Temperature of the hot side during operation
Tc	Temperature of the cold side during operation

Outline drawing of a thermoelectric module showing W1, L1, W2, L2 and H dimensions — Dimension letters used in the tables above. W₁ and L₁ are the cold side, W₂ and L₂ the hot side, H the assembled height.

Materials And Construction

What The Module Is Made Of

Thermoelectric material	Bi2Te3 based P-type and N-type pellets, purity 99.99 %
Pellet sizes	0.45×0.45, 0.6×0.65, 0.9×0.9 and 1.0×1.0 mm
Substrate	Aluminium oxide (Al2O3) ceramic
Plating	Nickel and stannum electroplating
Sealing	Silicone gel seal, vacuum anti-humidity process
Special outlines	Round modules specified by outer and inner diameter

Manufacturing Process

From Ingot To Finished Module

Bi2Te3 or PbTe crystal growth in our own furnaces
Wire electrical discharge machining of wafers and pellets for dimensional precision
Pellet grading, nickel and stannum electroplating
Patented soldering matched to the working temperature class
Substrate metallisation and pellet placement
Vacuum anti-humidity process and silicone gel sealing
Electrical test of every module, then marking and packing

Quality Control

Every Module Is Tested Before It Leaves The Line

Quality control runs from raw material procurement through crystal growth, pellet selection and module assembly to the dispatch of the finished product. All products are 100 % tested and inspected using test equipment sourced from an American thermoelectric company.

Raw material intakeBi2Te3 and PbTe feedstock checked for purity before crystal growth

Crystal growthIngots grown in house, then sliced into wafers and pellets

Pellet selectionPellets graded on Seebeck coefficient and resistivity

Module assemblyNi and Sn electroplating, patented soldering, alumina or aluminium substrate

Electrical test100 % of modules tested on American thermoelectric test equipment

DispatchSealing, marking, packing and final visual inspection before shipment

ISO 9001

Quality management system certified

SGS

European Union certification held by the manufacturing company

RoHS

All thermoelectric modules are RoHS compliant

100 % tested

Every module is tested and inspected before dispatch

Customization Options

Custom Micro Modules

Custom element sizes are welcome. A minimum order weight applies to material level customisation.

Non Catalogue Outlines

Square, rectangular, stepped or annular, cut to your submount.

Couple Count To Match A Driver

We change the number of couples so Vmax lands on your rail.

Lead-Out Options

Fine gauge leads, flying leads or pads, exiting where your housing allows.

Send Your Drawing On WhatsApp Email Your Specification

Comparison With Other Products

TES1 Compared With TEC1

	TES1 Micro	TEC1 Standard
Smallest footprint	1.8 × 3.4 mm	10 × 10 mm
Imax range	0.8 to 6.0 A	3.3 to 100 A
Qmax range	0.22 to 101 W	1.6 to 480 W
Pellet size	Under 1 mm²	Standard pellet array
Round outlines	Yes, OD and ID catalogued	Not catalogued
Best for	Detectors, laser diodes, optics	Cold plates, cabinets, appliances

Application Scenarios

Where TES1 Modules Are Used

Aerospace and Defense

Infrared detectors, night vision equipment and thermal viewers

Telecommunications

Laser diode and optical module temperature stabilisation

Reusable medical device validation in a laboratory

Life Science

Photomultiplier housings, microtome stages and small sample coolers

Use Guide

Working With Micro Modules

Confirm the heat load first. Detector and laser diode loads are usually under a watt, so an oversized module wastes power and adds its own Joule heat.
Check the hot side path. A micro module can only reject heat through its small hot face, so the submount conductivity matters more than the module choice.
Choose a stepped outline if the clamp has to sit outside the cooled area.
Keep mounting force even and modest. The maximum compressive load of 1 MPa still applies over a much smaller area.
Use a thin thermal interface. On a 3 mm module a thick grease line is a significant part of the thermal budget.
Drive with a controller that limits current, and use a thermistor in the loop for wavelength or dark current stability.

Direct current drives heat from the cold plate to the hot plate. Reverse the polarity and the module heats instead of cools.

Other Parts Of The Range

TEC1

TEC Standard Peltier Modules

158 catalogue sizes from 10×10 mm to 80×120 mm, Qmax 1.6 to 480 W.

Learn more

TEC Miniature Modules

The 10 to 15 mm end of the catalogue for compact instruments.

Learn more

TEA1

Stack of aluminium substrate thermoelectric modules with lead wires

TEA Aluminium Substrate Modules

A 122 W/m·K substrate that raises efficiency 30 to 50 %.

Learn more

Related Applications And Guides

Where This Product Is Used

Guide

Illustration of thermoelectric material research

How To Select A Peltier Module

Turn a heat load and a delta-T into a shortlist of part numbers.

Learn more

Guide

Thermoelectric assembly with heat sink and fan

Peltier Module Installation Guide

Mounting force, flatness, thermal interface and sealing.

Learn more

Guide

Taped thermoelectric pellets on a production reel

Thermoelectric Module Reliability

Why our modules reach 300,000 hours and what shortens that.

Learn more

FAQ

Frequently Asked Questions About TES Micro Thermoelectric Modules

How small can the module be?

The smallest catalogue code, TES1-00408, has a cold face of 1.8×3.4 mm and a hot face of 1.8×5.1 mm at 2.4 mm high. Below that we would look at a custom build.

What do the asterisked round modules mean?

Round modules are dimensioned by outer diameter (OD) and inner diameter (ID) rather than width and length. TES1-11930 is OD 30 mm with ID 5.0 mm, and TES1-04930 is OD 26 mm with ID 10 mm. They are used where an optical path or a shaft has to pass through the centre.

Can a micro module hold a laser diode wavelength stable?

That is one of the main uses of the series. Pair the module with a thermistor and a temperature controller so the loop corrects for ambient drift. The module supplies the heat pumping, the controller supplies the stability.

Are the electrical values measured the same way as the larger modules?

Yes. All catalogue data is tested at a hot side temperature of 30 °C, with Imax and Vmax defined at Qc = 0 and ΔTmax, and Qmax defined at Imax and ΔT = 0.

Do you supply matched pairs or batches?

Ask when you order. Because every module is tested, we can select within a batch to tighter limits when the application needs modules that behave alike.

Cooling Something Only A Few Millimetres Across

Send the footprint you have, the load in milliwatts or watts, and the temperature you must hold. We will point you at the right TES code or propose a custom outline.

Request A Quote Talk To An Engineer

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