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Comprehensive guide to CFR25J-240R carbon film resistors: technical specs, common SA uses, selection tips, and sourcing from Communica's broad component range.
Understand resistance, tolerance, and wattage for the CFR25J-240R carbon film resistor.
Typical applications for education, labs, and industry in SA circuits.
How to choose, compare, and buy CFR25J-240R from trusted local suppliers.
The CFR25J-240R is a widely-used 240-ohm (240R) carbon film resistor, popular among South African students, hobbyists, and engineers for breadboarding, prototyping, and production circuits. As part of the CFR25J family, it combines reliable general-purpose performance with affordability and local availability, making it a staple in electronics labs and classrooms.
| Specification | Value | Notes |
|---|---|---|
| Resistance | 240 Ohm | Standard E24 series value |
| Tolerance | 5% (J) | Typical for carbon film types |
| Power Rating | 0.25W (1/4W) | Limits acceptable dissipation |
| Maximum Working Voltage | 250V | Typically safe up to this voltage |
| Temperature Coefficient | 350 ppm/ degreesC | Sufficient for most non-critical applications |
| Construction | Axial, carbon film | Leads suitable for breadboard or PCB |
| Body Size | ~6.3mm (L) x 2.3mm (D) | Industry-standard for 1/4W |
- CFR: Carbon Film Resistor
- 25: 1/4W (0.25W) power rating
- J: 5% tolerance (J code)
- 240R: 240 ohm resistance value
You may spot similar resistors with values like CFR25J-100R, CFR25J-1K, etc., indicating the same family with different resistances.
The CFR25J-240R is used across education, research, and industry. Locally, popular uses include:
Engineering students, FET colleges, and university electronics labs in South Africa commonly specify the CFR25J series for hands-on protoboard lessons due to its low cost and reliable availability from local distributors like Communica.
When choosing a 240R resistor for your circuit, consider both the load voltage and power dissipation. Applying Ohm's Law and the power formula helps ensure you remain safely within the resistor's ratings:
| Calculation | Formula | Example |
|---|---|---|
| Current (I) | I = V / R | If V = 12V: I = 12V / 240Ohm ~ 0.05A (50mA) |
| Power (P) | P = V x I or I2 x R | P = 12V x 0.05A = 0.6W (Above 0.25W, use a higher power resistor!) |
Common brands in the local market include Royal Ohm, TruOhm, and UniOhm. Communica holds a broad range of carbon and metal film resistors, with lead times for bulk purchases typically 1-3 working days (subject to stock).
When ordering, always specify your desired resistance (e.g., 240R), power rating (0.25W, 0.5W), and required quantity. VAT invoices are available for education and corporate procurement.
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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I got the most pleasant service from Sydney and Windie
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