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Learn how to read resistor values and tolerances for CFR25J 2K7 resistors. Includes colour codes, practical examples, and buying tips for South African users.
How to interpret resistor markings, codes, and what 2K7 means for your design.
Understanding the 'J' marking and what 5% means in real circuits.
Find CFR25J resistors, check stock, and explore brands at Communica's SA branches.
CFR25J 2K7 resistors are a staple in South African electronics labs and industry. The name breaks down as follows:
These resistors are widely used in signal paths, pull-ups/pull-downs, and current limiting due to their affordable cost and reliable specs. Understanding their codes and markings helps ensure correct selection for both hobbyist and educational builds.
2K7 is a shorthand for 2.7 kilo-ohms (kOhm), using the letter 'K' in place of the decimal. Common marking systems for through-hole resistors are:
| Marking Example | Meaning |
|---|---|
| 2K7 | 2.7 kOhm |
| 2700Ohm | 2.7 kOhm |
| Brown, Black, Red, Gold (bands) | 1 (Brown), 0 (Black), x100 (Red) = 1,000Ohm; Gold = 5% |
A 2K7 resistor typically uses band colours: Red (2), Violet (7), Red (x100), and Gold (5%).
CFR25J 2K7 resistors follow the E24 series (preferred for 5% tolerance parts). The nearest standard values around 2K7 are:
| Standard Value (E24) | Actual Range (with 5%) |
|---|---|
| 2.4 kOhm | 2,280 - 2,520 Ohm |
| 2.7 kOhm | 2,565 - 2,835 Ohm |
| 3.0 kOhm | 2,850 - 3,150 Ohm |
This means a 2K7 (2,700 Ohm) resistor marked "J" might measure anywhere from 2,565 Ohm to 2,835 Ohm when tested with a digital multimeter.
The "J" in CFR25J specifies a tolerance of 5%. This is the allowable error from the stated resistance value under standard test conditions:
In most general-purpose circuits (LED current limiting, signal biasing, pull-ups), 5% is sufficient, but precision analog or timing circuits may require closer tolerance parts.
The CFR25J's 0.25W power rating indicates how much heat it can safely dissipate. For most breadboard or signal applications, this is adequate, but for higher currents or voltage drops, verify using:
Example (South African workshop): If you drop 5V across a 2K7 resistor:
P = 52 / 2,700 ~ 0.0093 W (well below the 0.25W limit).
Applications include analog filters, timing, biasing, sensor interfaces, power LED chains, and breadboarding in prototyping environments across South Africa.
| Parameter | Spec |
|---|---|
| Resistance | 2.7 kOhm (2K7) |
| Tolerance | 5% (J) |
| Power Rating | 0.25W (1/4W) |
| Type | Carbon Film, Axial Lead |
For full resistor ranges and to explore related passives or brands, visit Communica's resistor category online or enquire at a branch.
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