# Thermoelectric (Peltier) modules: TEC1-12706, 12710, 30 mm

> What are TEC1-12706 dimensions?

- Category: Hardware › Stirling & thermoacoustic
- Kind: Hardware
- Basis: Common TEC1 module sizes from manufacturer datasheets (Hebei I.T., Laird equivalents); thickness varies ±0.1 mm by maker
- Page: https://xemstudio.com/objects/thermoelectric-tec1/ · JSON: https://xemstudio.com/api/geometry?object=thermoelectric-tec1 · Plain text: https://xemstudio.com/objects/thermoelectric-tec1/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses

## Notes

- TEC1-12706: 40 × 40 × 3.8 mm (127 couples, 6 A, ~60 W heat pumping at ΔT 0); the standard hobby module. TEC1-12710: 40 × 40 × 3.3–3.4 mm, 10 A. 30 × 30 × 3.4 mm modules (TEC1-12704, 03104 class) for small loads. 50 × 50 and 62 × 62 exist for high current.
- Leads exit one edge (red +, black −); keep 5 mm clear there. Hot and cold faces are the ceramic plates: clamp between heat sinks with thermal paste, 4 × M3 at the heat-sink corners, never over-tighten (ceramic cracks).
- As a generator (Seebeck) a 12706 gives ~1–2 W at ΔT 100 K; the high-temperature TEG modules (TEG1-12611 etc.) share the 40 × 40 footprint but run to 300 °C.
- Why it's here: the LES thermoacoustic builds use a 12706 as a ΔT instrument and as a TEG on the cold spool to run the fan.

## Sizes

| module | size_mm | thickness_mm | i_max_a | note |
|---|---|---|---|---|
| TEC1-12706 | 40 × 40 | 3.8 | 6 | standard hobby module |
| TEC1-12710 | 40 × 40 | 3.4 | 10 | thinner |
| TEC1-12704 / 03104 | 30 × 30 | 3.4 | 4 | small |
| TEC1-12730 | 62 × 62 | 4.8 | 30 | large |

## Where the files are

- Wikipedia: [Thermoelectric cooling](https://en.wikipedia.org/wiki/Thermoelectric_cooling) — web — CC BY-SA 4.0 (text)
- Hebei I.T. (Shanghai): [TEC1-12706 datasheet](https://peltiermodules.com/peltier.datasheet/TEC1-12706.pdf) — PDF — Manufacturer datasheet (verify at link)
- Long Earth Society: [Engine builds that use these parts (videos and write-ups)](https://longearthsociety.com/engineering/) — web, video — LES site

## Free STEP/STL (3 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/thermoelectric-tec1/index.json

- tec1-12706-40x40x3.8: [STEP](https://xemstudio.com/files/hardware/thermoelectric-tec1/tec1-12706-40x40x3.8.step) · [STL](https://xemstudio.com/files/hardware/thermoelectric-tec1/tec1-12706-40x40x3.8.stl) — TEC1-12706: 40 × 40 × 3.8 mm, 127 couples, 6 A, leads on one edge
- tec1-12710-40x40x3.4: [STEP](https://xemstudio.com/files/hardware/thermoelectric-tec1/tec1-12710-40x40x3.4.step) · [STL](https://xemstudio.com/files/hardware/thermoelectric-tec1/tec1-12710-40x40x3.4.stl) — TEC1-12710: 40 × 40 × 3.4 mm (some 3.3), 10 A
- tec1-12704-30x30x3.4: [STEP](https://xemstudio.com/files/hardware/thermoelectric-tec1/tec1-12704-30x30x3.4.step) · [STL](https://xemstudio.com/files/hardware/thermoelectric-tec1/tec1-12704-30x30x3.4.stl) — TEC1-12704 / 03104 class: 30 × 30 × 3.4 mm

## Questions

**What are TEC1-12706 dimensions?**

40 × 40 × 3.8 mm (±0.1), leads 0.9 mm² on one edge, about 24 g. Fits between any two 40 mm heat sinks.

**What is the difference between TEC1-12706 and 12710?**

Current rating (6 vs 10 A) and thickness: 3.8 vs 3.3–3.4 mm. Same 40 × 40 footprint.

**Can a Peltier module generate power?**

Yes, as a Seebeck generator: a 12706 gives roughly 1–2 W at a 100 K temperature difference, enough for a 40 mm fan; dedicated TEG modules tolerate higher temperatures.

## Fits with

- [120 mm axial fan](https://xemstudio.com/objects/120mm-fan/)
- [Axial fans, 25 to 140 mm: frames and hole patterns](https://xemstudio.com/objects/axial-fan-frames/)
- [Socket head cap screws, M2–M8 (ISO 4762 / DIN 912)](https://xemstudio.com/objects/socket-head-cap-screws-metric/)
- [Tri-clamp spool (two ferrules on a tube), 1.5 and 2 inch](https://xemstudio.com/objects/tri-clamp-spool/)
- [Copper pipe (ASTM B88 Type L and M), 1/4 to 2 inch](https://xemstudio.com/objects/copper-pipe-type-l-m/)