3.3 ohm resistor color code

The color code for 3.3 Ω is orange, orange, gold, gold on a 4-band resistor (±5%) and orange, orange, black, silver, brown on a 5-band resistor (±1%).

Color bands

4 bands, ±5%Orange, Orange, Gold, Gold

5 bands, ±1%Orange, Orange, Black, Silver, Brown

6 bands, ±1%, 100 ppm/KOrange, Orange, Black, Silver, Brown, Brown

Open 3.3 Ω in the color code calculator →

Actual value by tolerance

Tolerance	Band	Minimum	Maximum
±1%	Brown	3.267 Ω	3.333 Ω
±2%	Red	3.234 Ω	3.366 Ω
±5%	Gold	3.135 Ω	3.465 Ω
±10%	Silver	2.97 Ω	3.63 Ω

SMD and printed codes

SMD, 3 digits	`3R3`
SMD, 4 digits	`3R30`
SMD, EIA-96	not used for this value
Letter code (IEC 60062)	`3R3`

Current and power at common voltages

Voltage	Current	Power	Resistor rating
3.3 V	1 A	3.3 W	10 W
5 V	1.52 A	7.58 W	over 10 W
9 V	2.73 A	24.5 W	over 10 W
12 V	3.64 A	43.6 W	over 10 W
24 V	7.27 A	175 W	over 10 W

As an LED resistor

Current through one LED in series with 3.3 Ω:

Supply	Red LED (2.0 V)	White or blue LED (3.2 V)
3.3 V	394 mA	30.3 mA
5 V	909 mA	545 mA
12 V	3030 mA	2670 mA

Above 20 mA: too much for a common 5 mm LED.

LED Resistor Calculator →

Standard series

3.3 Ω is a standard value in the E6, E12, E24 series, so it comes in almost every resistor kit.

Nearby values

← 2.7 Ω 3.9 Ω →

Same first two colors, different multiplier:

33 Ω 330 Ω 3.3 kΩ 33 kΩ 330 kΩ 3.3 MΩ

Frequently asked questions

What are the colors of a 3.3 Ω resistor?

On a 4-band resistor: orange, orange, gold, gold. On a 5-band resistor: orange, orange, black, silver, brown.

What is the SMD code for 3.3 Ω?

3R3 on 3-digit resistors and 3R30 on 4-digit (1%) resistors.

How much current flows through a 3.3 Ω resistor at 5 V?

1.52 A, dissipating 7.58 W: more than a standard resistor can handle.

Which resistors get mixed up with 3.3 Ω?

orange, orange, silver, gold is 330 mΩ and orange, orange, black, gold is 33 Ω: only the third band changes, so check it carefully.