The 8.2 kΩ (8200 Ω) resistor color code for a standard 5% tolerance 4-band axial resistor is Grey, Red, Red, Gold. For a 1% tolerance 5-band metal film resistor, the sequence is Grey, Red, Black, Brown, Brown. Because 8.2 is a base number in the standard E24 series, this value is ubiquitous in both through-hole and surface-mount designs, but reading the bands correctly depends heavily on the manufacturing standard and the lighting on your workbench.
The 8.2 kΩ Color Code Breakdown
Before we dig into the physics of resistor drift and bench measurement, here is the exact translation of the 8.2 kΩ value across the four most common physical formats you will encounter in modern and vintage electronics.
| Format | Band 1 (Digit) | Band 2 (Digit) | Band 3 (Digit/Mult) | Band 4 (Mult/Tol) | Band 5 (Tol) | Standard |
|---|---|---|---|---|---|---|
| 4-Band Axial (5%) | Grey (8) | Red (2) | Red (×100) | Gold (±5%) | - | IEC 60062 |
| 5-Band Axial (1%) | Grey (8) | Red (2) | Black (0) | Brown (×10) | Brown (±1%) | IEC 60062 |
| SMD 3-Digit (0805+) | 8 | 2 | 2 (×100) | - | - | EIA / JIS |
| SMD 4-Digit (Precision) | 8 | 2 | 0 | 1 (×10) | - | EIA / JIS |
What Each Row Means in Practice
4-Band Logic: You read the first two bands as digits (8 and 2) and the third band as the multiplier (Red = 10² or 100). 82 × 100 = 8200 Ω. The fourth band (Gold) indicates the manufacturer guarantees the actual resistance is within 5% of 8.2 kΩ (between 7.79 kΩ and 8.61 kΩ).
5-Band Logic: Precision metal film resistors use three significant digits. The value is 8, 2, and 0. The multiplier is Brown (10¹ or 10). 820 × 10 = 8200 Ω. The final Brown band denotes a tighter 1% tolerance (8118 Ω to 8282 Ω).
The E-Series Context: You will easily find 8.2 kΩ in 5% (E24 series) and 1% (E24 overlapping E96) tolerances. However, if you are designing a precision analog front-end requiring 0.1% tolerance, you are restricted to the E96 series. The E96 series does not include exactly 8.20 kΩ; you must step to 8.25 kΩ (Grey, Red, Green, Black, Brown) or 8.06 kΩ (Grey, Black, Blue, Black, Brown).
Standard Variants and "Rows People Get Wrong"
While we treat color codes as universal, the governing standards have shifted over the decades, and regional legacy formats still show up on repair benches.
Regional and Standard Variants
- IEC 60062 (Global Modern): The current international standard. It dictates the exact RGB values for the color bands and the physical spacing requirements. If you buy a resistor from DigiKey or Mouser today, it follows IEC 60062.
- BS1852 (Vintage UK): The old British Standard, largely superseded by the European adoption of IEC 60062. In very early UK manufacturing (1950s-1960s), some carbon composition resistors used a "body-tip-dot" system where the physical body color of the resistor represented the first digit, the painted tip was the second, and a dot was the multiplier. An 8.2 kΩ in this archaic system would have a Grey body, Red tip, and Red dot.
- MIL-PRF-55342 (US Military SMD): If you are repairing military or aerospace avionics, standard SMD numbers are replaced by a 5-character alphanumeric code that includes a failure rate designation. An 8.2 kΩ 1% military SMD might be marked
8201F, where 'F' denotes a 1% failure rate per 1000 hours.
The "Rows People Get Wrong" Notes
1. Red vs. Orange under Bench Lighting: Under warm 3000K LED desk lamps, the Red (2) and Orange (3) bands look nearly identical. An 8.2 kΩ (Red) is easily misread as 8.3 kΩ (Orange)—a value that doesn't exist in standard series, which should be your first clue something is wrong. Always verify axial resistors under 5000K daylight-balanced lighting.
2. Multiplier Gold vs. Tolerance Gold: Beginners often confuse the position of the Gold band. On an 8.2 Ω resistor, Gold is the multiplier (×0.1). On an 8.2 kΩ resistor, Gold is the tolerance (±5%). Always look for the physical gap: the tolerance band is spaced noticeably further away from the multiplier band.
3. SMD "822" vs "820": On a 3-digit SMD, 822 means 82 × 10² (8.2 kΩ). A common mistake is reading it as 822 Ω, or confusing it with 820 (which means 82 × 10⁰ = 82 Ω, not 820 Ω).
Safe Interpretation When Markings Are Faded or Missing
When repairing vintage audio gear or old CRT monitors, you will frequently encounter 8.2 kΩ resistors where the paint has blistered, the grey band has faded to a muddy brown, or the resistor is completely charred. Here is how to safely determine the value and verify the component's health.
The Carbon Composition Drift Problem
If the faded resistor is a vintage carbon composition type (usually a tan/brown cylindrical body with painted bands), you must account for moisture absorption and material drift. Carbon comp resistors almost always drift upward in value as they age. An original 8.2 kΩ resistor might measure 9.4 kΩ on your multimeter today. If you measure 9.4 kΩ in-circuit, do not assume the schematic is wrong or that a parallel component is pulling the value; the resistor itself has permanently degraded and must be replaced with a modern metal film equivalent.
Bench Measurement Protocol
Never trust an in-circuit resistance measurement. Parallel semiconductor junctions and capacitor leakage will skew your reading. Follow this exact sequence:
- De-energize and Discharge: Unplug the device and use a high-wattage bleeder resistor to discharge any large filter capacitors. Warning: Lethal voltages can persist in power supplies for hours.
- Isolate One Leg: Use a soldering iron to desolder and lift one leg of the 8.2 kΩ resistor out of the PCB pad. This breaks parallel circuit paths.
- Zero Your DMM: Short your multimeter probes together. Note the lead resistance (typically 0.1 Ω to 0.3 Ω). While negligible for an 8200 Ω measurement (an error of just 0.003%), it is a good bench habit.
- Measure and Compare: Read the value. If it is a 5% carbon film and reads 8.5 kΩ, it is within spec. If it reads 11 kΩ, it has suffered thermal or moisture damage and must be scrapped.
For further reading on identifying component failure modes and standardizing your bench toolkit, the SparkFun Resistor Tutorial provides an excellent visual guide to SMD sizing and thermal ratings that complement the color code data above.
