The 1.5 kΩ (1500 ohm) resistor color code is Brown, Green, Red for standard 5% tolerance 4-band resistors, and Brown, Green, Black, Brown for 1% tolerance 5-band metal film resistors. For surface mount (SMD) packages, the 3-digit code is 152 and the 4-digit code is 1501.
The 1.5 kΩ Resistor Color Code Reference Table
Use this spec-sheet table to identify 1.5 kΩ resistors across all common physical packages and tolerance grades. The values below assume standard IEC 60062 color mappings.
| Package / Band Type | Band 1 | Band 2 | Band 3 | Band 4 | Band 5 | Band 6 (TCR) | Typical Tolerance |
|---|---|---|---|---|---|---|---|
| 4-Band (Carbon Film) | Brown (1) | Green (5) | Red (×100) | Gold (±5%) | N/A | N/A | ±5% |
| 5-Band (Metal Film) | Brown (1) | Green (5) | Black (0) | Brown (×10) | Gold (±5%) | N/A | ±1% to ±5% |
| 6-Band (Precision) | Brown (1) | Green (5) | Black (0) | Brown (×10) | Brown (±1%) | Red (50ppm/°C) | ±1% |
| SMD 3-Digit (0603+) | 152 (15 × 10²) | N/A | ±5% | ||||
| SMD 4-Digit (0805+) | 1501 (150 × 10¹) | N/A | ±1% | ||||
| BS 1852 (Legacy UK) | 1K5 (Letter replaces decimal) | Suffix letter (e.g., J = ±5%) | Varies | ||||
Decoding the Bands: What Each Row Means in Practice
Understanding why the colors map to 1500 ohms requires breaking down the multiplier logic, which changes depending on whether you are holding a 4-band or 5-band component.
4-Band Logic (1.5 kΩ at 5%)
In a 4-band system, the first two bands are significant digits, and the third is the multiplier.
- Brown (1) and Green (5) give you the base number 15.
- Red (×100) is the multiplier. You append two zeros to the base number.
- 15 × 100 = 1500 Ω, or 1.5 kΩ.
- The fourth band, Gold, indicates a ±5% tolerance. This means the actual measured resistance on your multimeter can legally fall anywhere between 1425 Ω and 1575 Ω.
5-Band Logic (1.5 kΩ at 1%)
Precision metal film resistors use three significant digits. This is where many hobbyists miscalculate 1.5 kΩ.
- Brown (1), Green (5), and Black (0) give you the base number 150.
- Brown (×10) is the multiplier. You append one zero.
- 150 × 10 = 1500 Ω.
- Notice that the multiplier band is Brown (×10), not Red (×100). If you mistakenly read this as a 4-band resistor and applied the Red multiplier rule, you would calculate 150 × 100 = 15 kΩ, leading to a critical circuit failure.
Standard Variants: IEC 60062, EIA, and Legacy BS 1852
Resistor marking standards vary by region and era. While the color-to-number mapping is largely universal today, the physical standards and legacy alphanumeric codes differ.
| Standard | Region / Origin | Key Characteristics for 1.5 kΩ | Current Status |
|---|---|---|---|
| IEC 60062 | International (Global) | Defines the standard Brown-Green-Red color bands and SMD numeric codes. Mandates specific physical dimensions and lead spacing. | Active global standard. |
| EIA RS-279 | United States | Historically used the same color map as IEC but defined different US-centric physical body sizes and wattage derating curves. | Largely superseded by IEC, but still referenced in older US military (MIL-PRF) specs. |
| BS 1852 | United Kingdom (Legacy) | Uses alphanumeric printing instead of colors. 1.5 kΩ is printed as 1K5. The 'K' acts as the decimal point to prevent misreading faded ink. | Obsolete for new manufacturing, but frequently encountered when repairing vintage British audio and test gear. |
For modern SMD components, the EIA-96 standard may also apply to high-precision 0603 packages. In EIA-96, a 1.5 kΩ resistor is marked with a three-character code: 18A or 18Y (where '18' represents the base value 150 from a lookup table, and 'A' or 'Y' represents the multiplier).
Rows and Codes People Get Wrong
When sorting through a mixed bin of through-hole resistors, 1.5 kΩ is frequently confused with adjacent values due to visual similarities in the color bands.
1. Confusing the 5-Band Multiplier
The most common error is reading a 5-band 1.5 kΩ resistor (Brown-Green-Black-Brown) as a 4-band resistor. If your brain skips the Black (0) digit and treats the second Brown as a digit rather than a multiplier, you will misidentify the part. Rule of thumb: If there are 5 bands, the 4th band is always the multiplier.
2. Red vs. Orange Multipliers (1.5 kΩ vs 15 kΩ)
On cheap carbon film resistors, the red multiplier band (×100 for 1.5 kΩ) can look distinctly orange under warm workshop lighting. If the third band is Orange (×1000), the value is 15 kΩ, not 1.5 kΩ. Compare the band directly against a known 10 kΩ resistor (Brown-Black-Orange) to calibrate your eyes to the shop's lighting.
3. Faded Brown vs. Red First Digits
Old resistors subjected to high heat (like those near power supply transformer windings) often experience dye degradation. The first band (Brown for 1) can fade to look like a dark Red (2). If it is Red-Green-Red, the value is 2.5 kΩ. If it is Brown-Green-Red, it is 1.5 kΩ.
Decision Path: Identifying Faded, Missing, or Ambiguous Markings
Visual inspection is never the final authority on a component's value, especially for legacy or heat-stressed boards. Use this decision tree to safely interpret ambiguous 1.5 kΩ markings. This path terminates in a definitive verification step.
| Symptom / Observation | Immediate Action | Next Step / Resolution |
|---|---|---|
| Colors are muddy, darkened, or 1st band is ambiguous (Brown vs Red). | Do not guess based on adjacent circuit values. | Desolder one leg and measure with a DMM on the 2kΩ range. Target: 1.45k - 1.55k. |
| 4th band (tolerance) is completely missing or rubbed off. | Assume ±20% tolerance (common for vintage carbon composition). | Measure in-circuit (power OFF). If reading is wildly off, desolate and measure. If within 1.2k - 1.8k, it is likely a 20% 1.5k part. |
| SMD '152' code is partially scratched, looks like '157' or '162'. | Clean the package with 99% isopropyl alcohol and inspect under 10x magnification. | If still illegible, desolder and measure. SMD resistors are cheap; replace with a new 0603 1.5k 1% part if uncertain. |
| Resistor is burnt black, no bands visible, circuit smells of ozone. | The resistor has failed open or shifted drastically in value due to thermal runaway. | Trace the schematic for the node. Order a replacement 1.5k metal film (1W or 2W if it was a power resistor) and investigate the root cause of the overcurrent. |
When in doubt, the multimeter is the final arbiter. Set your digital multimeter to the 2kΩ range, short the probes to verify zero-offset, and measure the component out-of-circuit whenever possible to avoid parallel resistance paths skewing your reading. If the meter reads 1.498 kΩ, you have definitively confirmed a 1.5 kΩ 1% metal film resistor, regardless of what the faded paint claims.
