The 4.7kΩ (4,700 ohm) resistor color code depends entirely on the number of bands and the tolerance grade of the component. For a standard commercial 4-band 5% resistor, the sequence is Yellow, Violet, Red, Gold. For a 5-band 1% precision metal film resistor, the sequence is Yellow, Violet, Black, Brown, Brown.
Because 4.7kΩ is a standard E12 and E24 series value, it is one of the most common pull-up, pull-down, and current-limiting resistors found in both I2C bus wiring and LED driver circuits. Below is the complete reference data to identify, verify, and troubleshoot this specific component.
The 4.7k Resistor Color Code Reference Tables
The tables below map the exact color sequences for 4.7kΩ resistors across different tolerance grades. Read the bands starting from the end closest to the first color ring, moving toward the tolerance band (which is typically spaced slightly further apart).
Table 1: 4-Band 4.7kΩ Variants (Standard Commercial)
| Tolerance | Band 1 (1st Digit) | Band 2 (2nd Digit) | Band 3 (Multiplier) | Band 4 (Tolerance) | Common Chemistry |
|---|---|---|---|---|---|
| ±5% | Yellow (4) | Violet (7) | Red (×100) | Gold (±5%) | Carbon Film |
| ±2% | Yellow (4) | Violet (7) | Red (×100) | Red (±2%) | Carbon / Thick Film |
| ±10% | Yellow (4) | Violet (7) | Red (×100) | Silver (±10%) | Carbon Composition (Legacy) |
Table 2: 5-Band 4.7kΩ Variants (Precision)
| Tolerance | Band 1 | Band 2 | Band 3 (3rd Digit) | Band 4 (Multiplier) | Band 5 (Tolerance) | Common Chemistry |
|---|---|---|---|---|---|---|
| ±1% | Yellow (4) | Violet (7) | Black (0) | Brown (×10) | Brown (±1%) | Metal Film |
| ±0.5% | Yellow (4) | Violet (7) | Black (0) | Brown (×10) | Green (±0.5%) | Metal Film |
| ±0.25% | Yellow (4) | Violet (7) | Black (0) | Brown (×10) | Blue (±0.25%) | Precision Metal Film |
| ±0.1% | Yellow (4) | Violet (7) | Black (0) | Brown (×10) | Violet (±0.1%) | Precision Metal Film |
Table 3: IEC 60062 Master Color Digit Reference
| Color | Digit Value | Multiplier | Tolerance | Temp Coefficient (ppm/°C) | Hex Code (CAD) |
|---|---|---|---|---|---|
| Black | 0 | ×1 | — | 250 | #000000 |
| Brown | 1 | ×10 | ±1% | 100 | #8B4513 |
| Red | 2 | ×100 | ±2% | 50 | #FF0000 |
| Orange | 3 | ×1,000 | — | 15 | #FFA500 |
| Yellow | 4 | ×10,000 | — | 25 | #FFFF00 |
| Green | 5 | ×100,000 | ±0.5% | — | #008000 |
| Blue | 6 | ×1,000,000 | ±0.25% | 10 | #0000FF |
| Violet | 7 | ×10,000,000 | ±0.1% | 5 | #8A2BE2 |
| Gray | 8 | — | ±0.05% | 1 | #808080 |
| White | 9 | — | — | — | #FFFFFF |
| Gold | — | ×0.1 | ±5% | — | #FFD700 |
| Silver | — | ×0.01 | ±10% | — | #C0C0C0 |
Decoding the Bands: What Each Ring Means in Practice
To understand why the 4.7k resistor color code is structured this way, you must break down the mathematical function of each band according to the standard decoding methodology.
The 4-Band Math (5% Carbon Film):
The first two bands represent the significant digits. Yellow is 4, Violet is 7. This gives us the base number 47. The third band is the multiplier. Red represents 102, or 100. Multiplying the base by the multiplier (47 × 100) yields 4,700 ohms. The final Gold band dictates that the actual physical resistance can deviate by up to 5% in either direction, meaning a safe operating range for a 4.7kΩ 5% resistor is between 4,465Ω and 4,935Ω.
The 5-Band Math (1% Metal Film):
Precision resistors require three significant digits to account for tighter manufacturing tolerances. Yellow (4), Violet (7), and Black (0) form the base number 470. The multiplier band is Brown, representing 101 (or 10). Multiplying 470 by 10 gives exactly 4,700 ohms. The final Brown band indicates a 1% tolerance, tightening the acceptable physical range to 4,653Ω – 4,747Ω.
Standard Variants: IEC 60062 vs. MIL-Spec vs. Legacy EIA
While the colors themselves are universal, the governing standards dictate how they are applied, printed, and tested. Knowing which standard your component adheres to is critical for aerospace, automotive, and high-reliability DIY builds.
IEC 60062 (Global Commercial Standard):
This is the international standard published by the International Electrotechnical Commission. It defines the exact color-to-value mapping used in the tables above. If you buy a pack of Xicon or Yageo resistors from Mouser or DigiKey, they are governed by IEC 60062. This standard also defines the E-series preferred numbers (E12, E24, E96), which is why 4.7kΩ exists as a standard value rather than an arbitrary number like 4.6kΩ.
MIL-PRF-39008 / MIL-PRF-55342 (US Military & Aerospace):
US Defense Logistics Agency (DLA) specifications for axial leaded resistors (MIL-PRF-55342 for surface mount, MIL-PRF-39008 for axial) use the exact same IEC color codes but mandate strict environmental testing, lot traceability, and failure rate designations. A military-spec 4.7kΩ resistor will feature the standard Yellow-Violet-Red bands, but will often include an additional 5th or 6th band indicating the failure rate per 1,000 hours (e.g., a Yellow reliability band indicates 0.001% failure rate). These are rarely seen in consumer electronics but are common in surplus aviation and ham radio equipment.
Legacy EIA-RS-279 (Withdrawn US Standard):
Before global harmonization, the US Electronic Industries Alliance maintained RS-279. The color mappings were identical to the modern IEC standard, but the physical spacing and body color requirements (like the old tan/brown body for carbon composition vs. blue body for metal film) were more rigidly enforced by US manufacturers. Today, EIA-RS-279 is obsolete, and all modern production defaults to IEC 60062.
The "Rows People Get Wrong" & Faded Band Troubleshooting
Even experienced technicians misread color codes under poor bench lighting or when components have been subjected to thermal stress. Here are the most common pitfalls specific to the 4.7kΩ value and how to resolve them.
Rows People Get Wrong
- Violet (7) vs. Gray (8): Under warm LED bench lights, the deep purple of the Violet band can easily wash out and look like the slate-gray of an 8. If you misread the second band as Gray, you would calculate 48 × 100 = 4.8kΩ. While 4.8kΩ is not a standard E24 value, the mental math confusion can lead to troubleshooting errors. Fix: View the resistor under neutral white (5000K) daylight-balanced lighting.
- Red Multiplier (×100) vs. Orange Multiplier (×1,000): This is the most critical error for 4.7kΩ resistors. If the Red multiplier band is misread as Orange, you will assume the resistor is 47kΩ. This 10x error will completely break an I2C pull-up circuit or an LED current-limiting calculation. Fix: Red has a distinct crimson hue; Orange is distinctly yellowish. If in doubt, measure it.
- 5-Band Black (0) vs. Brown (1): On 5-band 4.7kΩ resistors, the third digit is Black (making the base 470). If misread as Brown, the base becomes 471. Multiplied by 10, you get 4,710Ω. While electrically negligible for a 1% part, it indicates a misread of the code.
Safe Interpretation When Markings are Faded or Missing
Carbon film resistors subjected to prolonged heat (often from a nearby power resistor or a failing voltage regulator) will experience thermal degradation of the epoxy coating. The Red multiplier band is notorious for fading into a washed-out pink or brownish-orange, making visual identification impossible.
The Verification Protocol:
- Isolate the Component: Never measure a resistor while it is soldered into a circuit. Parallel paths through semiconductors and other resistors will pull the reading down, often making a 4.7kΩ resistor read as 1.2kΩ or lower on a multimeter. Desolder at least one leg of the resistor to lift it from the PCB pad.
- Use a Quality DMM: A standard multimeter like the Fluke 115 or Klein MM400 will easily resolve a 4.7kΩ 5% resistor. Insert the leads into the V/Ω and COM jacks, set the dial to the 40kΩ or 4kΩ range (or use Auto-Ranging), and read the value.
- Account for Lead Resistance: For 5-band 0.1% precision resistors, the resistance of your multimeter probes (typically 0.2Ω to 0.5Ω) can introduce error. Short your probes together, note the offset, and subtract it from your final reading, or use a meter with a Relative (REL) mode to zero out the leads before measuring the 4.7kΩ component.
By relying on the IEC 60062 tables above and verifying with a DMM when thermal damage is present, you can confidently identify and deploy 4.7kΩ resistors in any analog or digital logic circuit.
