Actual value by tolerance
| Tolerance | Band | Minimum | Maximum |
|---|
| ±1% | Brown | 3.861 kΩ | 3.939 kΩ |
| ±2% | Red | 3.822 kΩ | 3.978 kΩ |
| ±5% | Gold | 3.705 kΩ | 4.095 kΩ |
| ±10% | Silver | 3.51 kΩ | 4.29 kΩ |
SMD and printed codes
| SMD, 3 digits | 392 |
|---|
| SMD, 4 digits | 3901 |
|---|
| SMD, EIA-96 | not used for this value |
|---|
| Letter code (IEC 60062) | 3K9 |
|---|
Current and power at common voltages
| Voltage | Current | Power | Resistor rating |
|---|
| 3.3 V | 846 µA | 2.79 mW | 1/8 W |
| 5 V | 1.28 mA | 6.41 mW | 1/8 W |
| 9 V | 2.31 mA | 20.8 mW | 1/8 W |
| 12 V | 3.08 mA | 36.9 mW | 1/8 W |
| 24 V | 6.15 mA | 148 mW | 1/2 W |
As an LED resistor
Current through one LED in series with 3.9 kΩ:
| Supply | Red LED (2.0 V) | White or blue LED (3.2 V) |
|---|
| 3.3 V | 0.333 mA | 0.0256 mA |
| 5 V | 0.769 mA | 0.462 mA |
| 12 V | 2.56 mA | 2.26 mA |
LED Resistor Calculator →
Standard series
3.9 kΩ is a standard value in the E12, E24 series, so it comes in almost every resistor kit.
Nearby values
Same first two colors, different multiplier:
Frequently asked questions
What are the colors of a 3.9 kΩ resistor?
On a 4-band resistor: orange, white, red, gold. On a 5-band resistor: orange, white, black, brown, brown.
What is the SMD code for 3.9 kΩ?
392 on 3-digit resistors and 3901 on 4-digit (1%) resistors.
How much current flows through a 3.9 kΩ resistor at 5 V?
1.28 mA, dissipating 6.41 mW. A 1/8 W resistor is enough.
Which resistors get mixed up with 3.9 kΩ?
orange, white, brown, gold is 390 Ω and orange, white, orange, gold is 39 kΩ: only the third band changes, so check it carefully.
