The standard 4-band color code for a 4.7k ohm (4700Ω) resistor with 5% tolerance is Yellow-Violet-Red-Gold. For a 5-band 1% precision metal film resistor, the code is Yellow-Violet-Black-Brown-Brown. The 4.7k value is a staple in the E24 standard series, most frequently deployed as an I2C pull-up resistor for 3.3V/5V logic or in RC timing networks for 555 oscillators.
Complete 4.7k Ohm Resistor Color Code Reference Table
Use this table to identify 4.7k resistors across through-hole and surface-mount formats. Always read the bands from left to right, keeping the tolerance band (usually Gold, Silver, or Brown) on the far right.
| Format | Band 1 (Digit) | Band 2 (Digit) | Band 3 (Digit/Mult) | Band 4 (Mult/Tol) | Band 5 (Tol) | Standard Tolerance |
|---|---|---|---|---|---|---|
| 4-Band (Standard) | Yellow (4) | Violet (7) | Red (×100) | Gold (±5%) | N/A | 5% (E24) |
| 4-Band (Precision) | Yellow (4) | Violet (7) | Red (×100) | Brown (±1%) | N/A | 1% (Rare 4-band) |
| 5-Band (Precision) | Yellow (4) | Violet (7) | Black (0) | Brown (×10) | Brown (±1%) | 1% (E96 / E24) |
| SMD 3-Digit (5%) | 4 | 7 | 2 (×100) | Marked as: 472 | 5% | |
| SMD 4-Digit (1%) | 4 | 7 | 0 | Marked as: 4701 (470 × 10) | 1% | |
Standard Variants: IEC 60062 vs. Regional Wiring Codes
A frequent point of confusion for DIYers transitioning from home electrical work to PCB design is the assumption that component markings follow regional wiring codes. Let's clear this up immediately: resistor color codes do not use NEC, IEC 60446, or old UK wiring color standards.
While the color standard is universal, the format varies based on the manufacturing specification:
- IEC 60062 (Commercial Standard): The baseline for 4-band and 5-band through-hole resistors. Defines the exact hue and multiplier values used globally.
- MIL-PRF-55342 (Military Spec): Uses the same IEC colors but mandates strict lot traceability, tighter thermal noise thresholds, and specific failure rate bands (often a 6th band indicating reliability, like Brown for 1% failure rate per 1000 hours).
- SMD Markings (EIAJ): Surface mount resistors abandon color bands entirely due to size constraints, relying on 3-digit (5%) or 4-digit (1%) printed numeric codes. Note that 4.7k is an E24 value, so it uses standard numeric printing rather than the alphanumeric EIA-96 lookup table reserved for obscure E96 1% values.
Bands People Get Wrong & Reading Faded Markings
Even experienced bench technicians misread bands under poor lighting or when dealing with vintage components. Here are the most common pitfalls and how to resolve them.
The Multiplier vs. Digit Confusion
The third band on a 4-band resistor is the multiplier, not a digit. For 4.7k, this band is Red (×100). Beginners often read Red as the digit '2', mistakenly calculating the value as 472 ohms. Always verify the physical spacing; the multiplier band is slightly separated from the digit bands, and the tolerance band (Gold/Silver) anchors the right side.
Violet (7) vs. Gray (8) on Vintage Parts
On modern metal film resistors, Violet and Gray are distinct. However, on vintage carbon composition resistors (like old Allen-Bradley 'dog bone' types), the dyes degrade. Violet often fades to a muddy brown or gray. If you are restoring vintage audio gear or old test equipment and the third digit looks ambiguous between 7 and 8, do not guess.
1. Isolate the resistor from the circuit (lift one leg) to prevent parallel path ghost readings.
2. Measure with a 4-wire Kelvin DMM if available, or a standard DMM on the 20k range.
3. If the reading is between 4.46k and 4.93k, it is a 4.7k (5% tolerance). If it reads >5.5k, the carbon element has degraded from thermal stress and the part must be replaced.
Frequently Asked Questions
What is the 4.7k ohm resistor color code for a 1% tolerance part?
For a standard 1% tolerance metal film resistor, the code is Yellow-Violet-Black-Brown-Brown. The first three bands (Yellow-Violet-Black) represent the digits 4-7-0. The fourth band (Brown) is the ×10 multiplier, yielding 4700Ω. The final Brown band indicates the ±1% tolerance. If you only have 5% (Gold) 4.7k resistors on hand, they are usually acceptable for I2C pull-ups, but avoid substituting them in precision analog feedback loops or active filter networks where 1% is required to maintain the Q-factor.
Why is 4.7k ohm such a common value in microcontroller circuits?
The 4.7k value is the industry-standard pull-up resistor for I2C communication buses operating at 400kHz (Fast-mode) on 3.3V or 5V logic. According to the I2C specification, the bus capacitance and the pull-up resistor form an RC low-pass filter. A 4.7k resistor provides the optimal balance: it is low enough to pull the line high within the 300ns rise-time specification, but high enough to limit the sink current through the open-drain MOSFETs to a safe ~1mA when the line is pulled low. For 100kHz Standard-mode, 10k is often used; for 1MHz Fast-mode+, 2.2k or 1k is preferred.
How do I read the code on a 4.7k SMD resistor?
Surface mount 4.7k resistors use printed numeric codes. If it is a standard 5% tolerance part (0603 or 0805 size), it will be marked 472 (47 × 10²). If it is a 1% precision part, it will typically be marked 4701 (470 × 10¹). Note that 0402 and 0201 size SMD resistors are often unmarked entirely due to their microscopic size; in those cases, you must rely on your component tape reel labeling or measure them with micro-tweezers before soldering.
What if my multimeter reads 4.85k on a 4.7k resistor?
A reading of 4.85k is perfectly normal and within specification for a 5% tolerance resistor. The acceptable range for a 4.7k part at 5% is 4465Ω to 4935Ω. Furthermore, standard digital multimeters have their own base accuracy specification (typically ±0.5% + 2 digits on the resistance range). If you need to verify the exact value for a precision DAC or ADC voltage divider, use a benchtop 6.5-digit multimeter, which will resolve the true resistance to the nearest 0.1 ohm.
References: Component identification standards and tolerance calculations align with the DigiKey Resistor Color Code Calculator and the foundational theory outlined in Electronics Tutorials on Resistor Colour Codes.
