Manganin 6J12 vs 6J13
Two grades from the same family, differing mainly in resistivity level. The choice is usually made by the resistance value the design needs, not by a property table.
| 6J12 | 6J13 | |
|---|---|---|
| Resistivity, 20 °C | ≈ 0.47 µΩ·m | ≈ 0.43–0.44 µΩ·m |
| Temperature coefficient | ≈ ±10–20 ppm/K | ≈ ±20 ppm/K |
| Thermal EMF vs copper | ≈ 1–2 µV/K | ≈ 1–2 µV/K |
| Typical use | General precision shunts, load banks | Meter shunts, BMS current sensing |
| Availability | Standard stock range | Standard stock range |
How to choose in practice
Start from the resistance. A shunt needs a specific Ω value at a specific current, and the wire diameter is usually fixed by the welding or soldering process. With diameter fixed, the grade decides the length — and a shorter part is often the reason 6J13 is chosen for meters.
Where there is no length constraint, 6J12 is the broader grade and the safer default, because more published data and more existing designs reference it.
Target resistance, operating current, and the diameter your process can handle. From those three we can propose the grade and the length, and tell you whether either grade will hold the tolerance you need.
Are the two interchangeable?
Do both come in fine diameters?
Send the specification — diameter, grade, temper, quantity.
We come back with a confirmed lead time and the documentation we can issue for the shipment. 100 g sample at cost; orders from 1 kg.
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