1.8 Ω resistor colour code
Four bands: Brown · Grey · Gold · Gold. The first two give the digits, the third multiplies, the fourth states how far off the real part may be.
Nominal
1.8 Ω
1.8 ohms
Real range at ±5%
1.71 Ω – 1.89 Ω
A gold band allows this much drift.
Series
E12
Held in almost every parts drawer.
Band by band
| Band | Colour | Meaning |
|---|---|---|
| 1 | Brown | 1st digit — 1 |
| 2 | Grey | 2nd digit — 8 |
| 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 | 1.83 A | 6.05 W | no standard part — needs a power resistor or a heatsink |
| 5 V | 2.78 A | 13.9 W | no standard part — needs a power resistor or a heatsink |
| 12 V | 6.67 A | 80 W | no standard part — needs a power resistor or a heatsink |
| 24 V | 13.3 A | 320 W | no standard part — needs a power resistor or a heatsink |
What you can actually get
Parts made
117
142nd most of 1,465 values
In stock
98
across 1 of them
Cheapest at 100
$0.0034
each
Tolerances sold
±0.1% to ±10%
6 grades in all
Packages: 0805, 0603, 1206, 1210, 2010, 2512, 0402, 0612. Ratings: 50mW to 10W.
What ten of them actually cost
The price everyone quotes is the reel price. If you want ten, you cannot buy the reel — and the real figure is usually several times higher per piece.
Ten pieces
$0.26
$0.026 each · Cut Tape (CT) · minimum order 1
The reel price
$0.00349
each, but only from 50,000 pieces up
Sitting in stock
691,107
across 1 part numbers
Per piece, ten costs 7.4× the reel price. That gap is why a handful of resistors never costs what the headline price suggests.
Stocked in ±1%, rated 1/10 W.
Cheapest part you can buy ten of: RMCF0603FT1R80 by Stackpole Electronics Inc — see it at Digi-Key.
Assembly stock from the JLCPCB library, read 2026-09-24. Retail prices and stock from Digi-Key, read 2026-09-24. Prices move — check the product page before ordering. That is what a board house will place for you — not everything a distributor sells.
The same value, marked differently
Five bands
BrownGreyBlackSilverBrown
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 1.8 Ω — which is why measuring beats reading when it matters.
If you do not have one
Standard values that land within 1% of 1.8 Ω when combined.