330 Ω resistor color code
A 330 Ω resistor is marked orange-orange-brown-gold on a 4-band (±5%) resistor and orange-orange-black-black-brown on a 5-band (±1%) resistor. Its SMD marking is 331 or 3300.
Reading the bands
| Band | 4-band (±5%) | 5-band (±1%) |
|---|---|---|
| 1 | Orange — 1st digit 3 | Orange — 1st digit 3 |
| 2 | Orange — 2nd digit 3 | Orange — 2nd digit 3 |
| 3 | Brown — Multiplier ×10 | Black — 3rd digit 0 |
| 4 | Gold — Tolerance ±5% | Black — Multiplier ×1 |
| 5 | — | Brown — Tolerance ±1% |
Check: 33 ×10 = 330 Ω; 330 ×1 = 330 Ω. A ±5% part measures between 313.5 Ω and 346.5 Ω.
Codes and series
| Schematic notation | 330R |
|---|---|
| SMD 3-digit | 331 |
| SMD 4-digit | 3300 |
| EIA-96 | none (not an E96 value) |
| E-series | E6, E12, E24 |
| Neighbouring E24 values | 300 Ω and 360 Ω |
Typical uses
A 330 Ω resistor runs a red LED on 5 V at about 9 mA, and is a frequent choice for optocoupler inputs. It is also recommended in series with the data line of WS2812 / NeoPixel LED strips (values of roughly 300–500 Ω are typical) to protect the first pixel from voltage spikes.
Current and power at common voltages
The current and heat in a 330 Ω resistor depend on the voltage across the resistor itself (not necessarily the supply voltage). Choose a resistor rated at least twice the power shown.
| Voltage across it | Current | Power | Minimum rating |
|---|---|---|---|
| 3.3 V | 10 mA | 33 mW | 1/8 W |
| 5 V | 15.2 mA | 75.8 mW | 1/4 W |
| 9 V | 27.3 mA | 245 mW | 1/2 W |
| 12 V | 36.4 mA | 436 mW | 1 W |
| 24 V | 72.7 mA | 1.75 W | 5 W |
Don't mix it up with
Values with the same digits differ only in the multiplier band, so check that band carefully:
| Value | 4-band code | Multiplier band |
|---|---|---|
| 3.3 Ω | Orange-Orange-Gold-Gold | Gold ×0.1 |
| 33 Ω | Orange-Orange-Black-Gold | Black ×1 |
| 330 Ω | Orange-Orange-Brown-Gold | Brown ×10 |
| 3.3 kΩ | Orange-Orange-Red-Gold | Red ×100 |
| 33 kΩ | Orange-Orange-Orange-Gold | Orange ×1k |
FAQ
What color code is a 330 Ω resistor?
A 330 Ω ±5% resistor is orange-orange-brown-gold (4 bands). A 330 Ω ±1% resistor is orange-orange-black-black-brown (5 bands).
What is the SMD code for 330 Ω?
331 on 3-digit (±5%) parts and 3300 on 4-digit (±1%) parts. It has no EIA-96 code because it is not an E96 value.
Is 330 Ω a standard resistor value?
Yes, it is in the E6, E12, E24 series.
How much power does a 330 Ω resistor dissipate at 5 V?
With 5 V across it, 75.8 mW (P = V² ÷ R). A 1/4 W or larger resistor is enough.
Open 330 Ω in the calculator →All values
← 270 Ω resistor · 470 Ω resistor →