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Get detailed specs, ratings, and SA-relevant usage notes for CFR25J 22K carbon film resistors. Compare features, learn application tips, and troubleshoot common issues-by Communica.
Understand the CFR25J 22KOhm's ratings and how to read its markings.
Explore common uses in electronics, education, and prototyping across South Africa.
Get advice on choosing, buying, and troubleshooting these resistors locally.
The CFR25J 22K resistor is a widely used 22,000-ohm (22kOhm) carbon film resistor, often specified for educational, hobbyist, and industrial electronics projects across South Africa. Commonly found in the 0.25W (1/4-watt) size, this resistor offers a solid blend of reliability, easy identification, and cost-effectiveness, making it a staple in both introductory electronics kits and professional assemblies.
Carbon film resistors, such as the CFR25J series, are constructed by depositing a thin carbon film onto an insulating substrate, then spiral-cutting to set the resistance. This results in:
Below is a summary table of the standard CFR25J 22K resistor technical attributes you'd typically find when sourcing stock for lessons, repairs, or industry projects:
| Specification | CFR25J 22K Value |
|---|---|
| Resistance | 22,000Ohm (22kΩ) |
| Power Rating | 0.25W (1/4-watt at 70 degreesC) |
| Tolerance | 5% (J code) |
| Max Working Voltage | 250V |
| Max Overload Voltage | 500V |
| Temperature Range | -55 degreesC to +155 degreesC |
| Body Dimensions | Approx. 6.3 x 2.3 mm |
These markings are standard and help quickly confirm resistor value and tolerance during prototyping or repairs.
CFR25J resistors generally comply with widely accepted international component norms (see manufacturer datasheets). They are suitable for use in 3.3V/5V/12V logic circuits, through-hole prototyping, analog filtering, and voltage divider applications common in South African labs and classrooms.
When specifying a CFR25J 22K resistor, keep these practical points in mind to ensure reliability and safety in your South African builds:
Suppose you connect a 22kOhm resistor to a 12V supply as part of a timing or sensor circuit. Calculate its current and power as follows:
This is comfortably below the 0.25W rating, so suitable for typical control or signal applications.
For student lab benches and maker spaces, the CFR25J series is a cost-effective default-readily available from local suppliers and typically delivered within a few working days. VAT invoices and procurement support are available for tertiary and industrial buyers.
| Feature | CFR25J 22K (Carbon Film) | MFR25J 22K (Metal Film) |
|---|---|---|
| Tolerance | 5% | 1% |
| Noise | Moderate (suitable for most) | Low (better for analog/precision) |
| Price (Estimate, ZAR) | ~R0.18-R0.40/each | ~R0.30-R0.60/each |
Free shipping for orders over ZAR 1,000.00.
Get a full refund if you had the product for less than 7 days.
Nationwide delivery within 2 - 4 working days.
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