2 Ω resistor colour code
Four bands: Red · Black · Gold · Gold. The first two give the digits, the third multiplies, the fourth states how far off the real part may be.
Nominal
2 Ω
2 ohms
Real range at ±5%
1.9 Ω – 2.1 Ω
A gold band allows this much drift.
Series
E24
E24 only — stocked less often.
Band by band
| Band | Colour | Meaning |
|---|---|---|
| 1 | Red | 1st digit — 2 |
| 2 | Black | 2nd digit — 0 |
| 3 | Gold | Multiplier — ×0.1 |
| 4 | Gold | Tolerance — ±5% |
How much it can take
Current and dissipation across the resistor, and the package you need. The suggested rating keeps a factor of two in hand, which is what anyone building a board actually does.
| Across it | Current | Dissipated | Package to pick |
|---|---|---|---|
| 3.3 V | 1.65 A | 5.44 W | no standard part — needs a power resistor or a heatsink |
| 5 V | 2.5 A | 12.5 W | no standard part — needs a power resistor or a heatsink |
| 12 V | 6 A | 72 W | no standard part — needs a power resistor or a heatsink |
| 24 V | 12 A | 288 W | no standard part — needs a power resistor or a heatsink |
What you can actually get
Parts made
138
125th most of 1,465 values
In stock
33,398
across 11 of them
Cheapest at 100
$0.0057
each
Tolerances sold
±0.1% to ±7%
7 grades in all
Packages: 0603, 1206, 0805, 0402, 1210, 1225, 1020, 1218. Ratings: 30mW to 50W.
Assembly stock from the JLCPCB library, read 2026-09-24. That is what a board house will place for you — not everything a distributor sells.
The same value, marked differently
Surface mount
200· three-digit, nearest only
2000· four-digit, precision parts
30A· EIA-96, for the smallest parts
Three digits carry two significant figures, so they cannot write 2 Ω — 200 means 20 Ω. A part at this value is marked 2000.
Five bands
RedBlackBlackGoldBrown
Three significant digits and a ±1% band.
Values that can overlap this one
At ±5% the tolerance bands of neighbouring values run into each other. A part sold as one of these could measure the same as a 2 Ω — which is why measuring beats reading when it matters.
- 1.91 Ω1.8909 Ω–1.9291 Ω
- 1.96 Ω1.9404 Ω–1.9796 Ω
- 2.05 Ω2.0295 Ω–2.0705 Ω
- 2.1 Ω2.079 Ω–2.121 Ω
- 2.2 Ω2.09 Ω–2.31 Ω
If you do not have one
Standard values that land within 1% of 2 Ω when combined.