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Explore CFR25J-2K2 resistor specs: power, tolerance, voltage, code markings, and real-world uses. Selection advice and SA availability from Communica.
Understand resistance, wattage, tolerance and max voltage for the CFR25J-2K2 resistor.
See how the CFR25J-2K2 is applied in local electronics, education and industry.
Availability, brand options and buying notes for South Africa from Communica.
The CFR25J-2K2 resistor is a carbon film type, widely used in hobbyist, educational and professional circuits throughout South Africa. Its resistance value (2.2 kOhm) makes it a common choice for signal limiting, pull-up/pull-down duties, current setting, and LED circuits. The "CFR25J" designation follows a familiar pattern in resistor part numbering, providing instant insight into its size, power rating and construction method.
| Parameter | Value | Notes (SA Context) |
|---|---|---|
| Resistance | 2.2 kOhm (2K2) | Marked as Red-Red-Red-Gold |
| Power Rating | 0.25 W (250 mW) | Standard for through-hole |
| Tolerance | 5% (J) | Suitable for most general uses |
| Max Working Voltage | 250 V | Check in high-voltage designs |
| Temperature Range | -55 degreesC to +155 degreesC | Can handle SA ambient swings |
Given South Africa's mix of high summer temperatures and variable project environments, it's wise to de-rate resistors below maximum values-especially in tightly packed enclosures where heat can accumulate. While the CFR25J-2K2 is specified for 0.25W continuous dissipation in free air, a typical design margin is to run at 50-60% (0.125-0.15W) for extended reliability. Student breadboarding, repairs, and maker builds all benefit from this safety margin.
Example: You need to drop 5V across a 2.2kOhm resistor powering an LED. Use Ohm's Law (V = IR) and the power formula (P = V2/R):
+5V ---[CFR25J-2K2]---[LED]---GND
This basic circuit illustrates the use of the CFR25J-2K2 as a current limiter for an LED. Such simple configurations are common in classrooms, Raspberry Pi/GPIO protection, and signal level shifting in local tertiary projects.
Communica lists thousands of resistors across 1/4W, 1/2W and 1W formats, with both carbon and metal film construction. Shop Resistors or browse by Brand for product variations. Typical lead times for CFR25J-2K2 are short, and collection is available at Samrand, Pretoria, or Cape Town branches with ZAR price and VAT invoice support for educational or industrial procurement cases.
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