39 AWG (American Wire Gauge) wire specifications: 0.0897 mm diameter, 0.0063 mm² area. Resistance, weight, and common uses.
| Diameter | 0.0897 mm · 0.003531" · 3.53 mils |
| Cross-sectional area | 0.0063 mm² · 12 circular mils |
| Resistance (copper, 20°C) | 2728.7336 Ω/km · 831.718 Ω/1000ft |
| Resistance (aluminum, 20°C) | 4473.34 Ω/km · 1363.48 Ω/1000ft |
| Ampacity — copper 60°C | — A |
| Ampacity — copper 75°C | — A |
| Ampacity — copper 90°C | — A |
| Ampacity — aluminum 75°C | — A |
| Weight (copper) | 0.057 kg/km · 0.038 lbs/1000ft |
| Weight (aluminum) | 0.017 kg/km · 0.011 lbs/1000ft |
| Closest IEC 60228 size | 0.0063 mm² actual — smaller than 0.5 mm², the smallest IEC 60228 size |
| Skin depth at 60 Hz | 8.531 mm |
| Type | Temperature | Description |
|---|---|---|
| PVC | 60-105°C | General purpose insulation |
| Teflon (PTFE) | 200°C | High temperature applications |
| Silicone | 200°C | Flexible, high temperature |
| Enamel | 155-220°C | Magnet wire coating |
39 AWG wire (0.0897 mm diameter) is among the finest commonly available magnet wire sizes. It is used in precision instrument coils, miniature transformer windings, and high-impedance electromagnetic pickups. At roughly 0.09 mm, it is barely thicker than a human hair and must be wound by machine.
39 AWG wire has a diameter of 0.0897 mm (89.7 µm), which is approximately the same thickness as a human hair (about 0.07 mm). Its cross-sectional area is just 0.006318 mm². At this size, the wire is too fragile for manual handling in most cases and is typically wound by machine as enameled magnet wire.