30 Ω resistor colour code
Four bands: Orange · Black · Black · Gold. The first two give the digits, the third multiplies, the fourth states how far off the real part may be.
Nominal
30 Ω
30 ohms
Real range at ±5%
28.5 Ω – 31.5 Ω
A gold band allows this much drift.
Series
E24
E24 only — stocked less often.
Band by band
| Band | Colour | Meaning |
|---|---|---|
| 1 | Orange | 1st digit — 3 |
| 2 | Black | 2nd digit — 0 |
| 3 | Black | Multiplier — ×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 | 110 mA | 363 mW | 1 W |
| 5 V | 167 mA | 833 mW | 2 W |
| 12 V | 400 mA | 4.8 W | no standard part — needs a power resistor or a heatsink |
| 24 V | 800 mA | 19.2 W | no standard part — needs a power resistor or a heatsink |
What you can actually get
Parts made
160
115th most of 1,465 values
In stock
12,745
across 7 of them
Cheapest at 100
$0.0013
each
Tolerances sold
±0.01% to ±5%
8 grades in all
Packages: 1206, 0402, 0805, 0603, 1210, 2512, 1020, 2010. Ratings: 30mW to 50W.
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
$0.65
$0.065 each · Cut Tape (CT) · minimum order 1
The reel price
$0.013
each, but only from 50,000 pieces up
Sitting in stock
66,571
across 5 part numbers
Per piece, ten costs 4.9× the reel price. That gap is why a handful of resistors never costs what the headline price suggests.
Stocked in ±1% and ±5%, rated 1/2 W to 100 W.
Cheapest part you can buy ten of: ERJ-P06J300V by Panasonic Industry — 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
OrangeBlackBlackBlackBrown
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 30 Ω — which is why measuring beats reading when it matters.
- 28.7 Ω28.413 Ω–28.987 Ω
- 29.4 Ω29.106 Ω–29.694 Ω
- 30.1 Ω29.799 Ω–30.401 Ω
- 30.9 Ω30.591 Ω–31.209 Ω
- 31.6 Ω31.284 Ω–31.916 Ω
- 33 Ω31.35 Ω–34.65 Ω
If you do not have one
Standard values that land within 1% of 30 Ω when combined.