If you need to identify a 2,200 ohm (2.2 kΩ) resistor on your bench right now, here is the direct answer: a standard 5% tolerance 4-band resistor is Red-Red-Red-Gold. If you are holding a tighter 1% tolerance 5-band resistor, the sequence is Red-Red-Black-Brown-Brown.
Because 2.2 kΩ is a base value in the standard E24 resistor series, it is one of the most common components you will find in commercial PCBs and DIY kits. However, reading the bands accurately requires understanding how the International Electrotechnical Commission (IEC) structures these codes, and knowing how to troubleshoot when heat or age has distorted the colours.
The 2.2 kΩ Resistor Colour Code Reference Tables
Below are the specific band breakdowns for a 2.2 kΩ resistor, followed by the complete master reference chart defined by the IEC 60062 standard. Keep this chart handy for your bench.
Table 1: 2.2 kΩ Band Breakdown (4-Band vs. 5-Band)
| Format | Band 1 (Digit 1) | Band 2 (Digit 2) | Band 3 (Digit 3 / Mult) | Band 4 (Mult / Tol) | Band 5 (Tolerance) | Result |
|---|---|---|---|---|---|---|
| 4-Band (5%) | Red (2) | Red (2) | Red (x100) | Gold (±5%) | N/A | 2,200 Ω |
| 5-Band (1%) | Red (2) | Red (2) | Black (0) | Brown (x10) | Brown (±1%) | 2,200 Ω |
| 5-Band (5%) | Red (2) | Red (2) | Black (0) | Brown (x10) | Gold (±5%) | 2,200 Ω |
Table 2: Complete IEC 60062 Master Colour Chart
| Colour | Digit Value | Multiplier | Tolerance | Temperature Coefficient (ppm/K) |
|---|---|---|---|---|
| Black | 0 | x1 (10^0) | — | 250 |
| Brown | 1 | x10 (10^1) | ±1% | 100 |
| Red | 2 | x100 (10^2) | ±2% | 50 |
| Orange | 3 | x1,000 (10^3) | — | 15 |
| Yellow | 4 | x10,000 (10^4) | — | 25 |
| Green | 5 | x100,000 (10^5) | ±0.5% | — |
| Blue | 6 | x1,000,000 (10^6) | ±0.25% | 10 |
| Violet | 7 | x10,000,000 (10^7) | ±0.1% | 5 |
| Grey | 8 | — | ±0.05% | — |
| White | 9 | — | — | — |
| Gold | — | x0.1 (10^-1) | ±5% | — |
| Silver | — | x0.01 (10^-2) | ±10% | — |
Note: As detailed in the EEPower resistor standards guide, the temperature coefficient band is typically a 6th band on high-precision resistors, but is rarely seen on standard 2.2 kΩ carbon or thick-film parts.
Common Misreads: Faded Bands and the 'Rows People Get Wrong'
Even experienced technicians misread resistors when the epoxy coating has degraded. Here is how to navigate the most common visual traps when identifying a 2.2 kΩ component.
The Red vs. Orange Trap (Heat Discolouration)
The most frequent mistake on the bench is confusing a Red band (digit 2 or multiplier x100) with an Orange band (digit 3 or multiplier x1,000). When a 1/4W carbon film resistor operates near its thermal limit, the clear epoxy lacquer yellows and browns due to UV exposure and heat cycling. This shifts the visual spectrum of the underlying red paint, making it look distinctly orange or even dark brown.
The Fix: Never rely solely on colour under warm bench lighting (like 2700K incandescent or warm LEDs). Use a 5000K daylight lamp. If the resistor feels brittle or the lacquer is cracked, the colour is compromised. Scrap the visual read and verify with a multimeter.
The Multiplier vs. Digit Confusion
In a 4-band 2.2 kΩ resistor, the third band is Red (Multiplier x100). In a 5-band 2.2 kΩ resistor, the third band is Black (Digit 0) and the fourth band is Brown (Multiplier x10). Beginners often read a 5-band resistor as a 4-band resistor, stopping early and calculating the wrong value. Always count the total number of bands before assigning digit vs. multiplier roles.
Reading Direction and the Tolerance Gap
Resistors are not symmetrical. The tolerance band (Gold or Silver for standard 2.2 kΩ parts) is almost always separated from the digit bands by a slightly wider gap, and it is usually positioned on the right side when reading left-to-right. If you read a 4-band Red-Red-Red-Gold backwards, you would interpret Gold as a multiplier (x0.1), resulting in a nonsensical 0.22 Ω value. Gold and Silver never appear as the first digit band.
IEC 60062 Standards, Legacy Variants, and Bench Verification
While the colour bands are universal today, understanding the governing standards and legacy alternatives will help you identify 2.2 kΩ resistors on older equipment or in different global markets.
IEC 60062 vs. Legacy Alphanumeric Codes
The modern global standard for resistor colour coding is IEC 60062. However, if you are repairing vintage British or European audio equipment from the 1970s and 80s, you may encounter the legacy BS1852 (British Standard) alphanumeric code instead of colour bands.
Under BS1852, a 2.2 kΩ resistor is printed directly on the body as 2K2 or 2K2K (where the final K denotes tolerance). The letter replaces the decimal point to prevent misreading if the print is smudged (e.g., '2.2K' could be misread as '22K' if the dot rubs off, but '2K2' remains unambiguous). Surface Mount Device (SMD) resistors use a similar modern logic: a 2.2 kΩ SMD resistor in the E24 series will typically be marked 222 (22 x 10^2).
Verifying 2.2 kΩ on the Multimeter
When visual identification fails, your digital multimeter (DMM) is the final authority. For a 2.2 kΩ resistor, a standard 2-wire measurement on a quality DMM (like a Fluke 87V or Brymen BM235) is perfectly adequate. The test lead resistance (typically 0.1 Ω to 0.3 Ω) represents an error of less than 0.02%, which is well within the tolerance of even a 1% metal film resistor.
Expected Measurement Ranges:
- 5% Tolerance (Gold): Acceptable range is 2,090 Ω to 2,310 Ω.
- 1% Tolerance (Brown): Acceptable range is 2,178 Ω to 2,222 Ω.
If your out-of-circuit measurement reads significantly outside these bounds, the resistor has likely suffered from carbon track degradation or a micro-fracture in the metal film layer and must be replaced. For further reading on interpreting DMM readings and component testing, the All About Circuits reference chapter on resistor codes provides excellent foundational diagrams.
