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Explore the detailed specs, datasheet, and South African applications for the CFR50J 3K3 (3.3kOhm, 0.5W, 5%) carbon film resistor, plus local stock tips from Communica.
A 3.3kOhm, 0.5W, 5% carbon film resistor for general electronic circuits.
Ideal for biasing, pull-up/down, LEDs, and prototyping in education or industry.
Explore South African availability, lead times, and popular brands stocked locally.
The CFR50J 3K3 resistor is a general-purpose, carbon film fixed resistor, widely used in educational, prototyping, and industrial electronic circuits. The 'CFR' stands for Carbon Film Resistor, with '50' denoting a 0.5W (1/2 watt) power rating and 'J' indicating a 5% tolerance. The '3K3' refers to 3.3 kilo-ohms (3,300Ohm) resistance value. This class of resistor is a convenient choice for pull-ups, biasing, and LED current limiting in common South African electronics projects, supported by strong local stock from distributors like Communica.
| Parameter | Spec | Notes |
|---|---|---|
| Resistance Value | 3.3kOhm (3K3) | E12 series; marked as orange-orange-red-gold |
| Power Rating | 0.5W (1/2 Watt) | At 70 degreesC ambient (derate above 70 degreesC) |
| Tolerance | 5% (J) | Gold band; suitable for non-precision work |
| Max Working Voltage | 250V | Check application limits for mains or higher-voltage circuits |
| Temp. Coefficient | 350ppm/ degreesC | Typical for carbon film type |
| Lead Diameter | ~0.5-0.6mm | Axial, suitable for breadboards and PCBs |
| Dimensions (Body) | Approx. 9mm x 3mm | Typical for 1/2-watt carbon film |
Always refer to product datasheets for model-specific ratings, especially when substituting between manufacturers (e.g., Royal Ohm, Yageo, Uniohm, and other popular brands stocked by Communica).
This standard code makes it quick to compare alternatives and pick the correct value off the shelf for repairs, prototyping, and bulk production runs.
The typical operating temperature range is -55 degreesC to +155 degreesC. As with all through-hole resistors, power ratings must be derated above 70 degreesC ambient, which is relevant for South African summers, especially in non-cooled workshops.
To drive a standard 2V red LED from a 5V supply using a CFR50J 3K3 resistor:
This is a safe, low-power indicator circuit for microcontrollers, perfect for classroom use or workshop prototyping.
The 3.3kOhm value is commonly chosen for reliable digital input stabilization on MCUs and PLCs. A higher wattage rating provides robustness against accidental overvoltage or ESD events sometimes encountered in test panels.
In basic switching circuits, a 3.3kOhm resistor can bias the base of small-signal NPN transistors from 5V or 12V logic rails. For example:
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Get a full refund if you had the product for less than 7 days.
Nationwide delivery within 2 - 4 working days.
Communica supplies semiconductors and electronic components to industries such as automotive, electrical, automation, mining, and education.
Disclaimer: This content is for educational purposes only. Product availability, pricing, and specifications are subject to change. Always verify current details on the retailer's website before making a purchase. We may earn affiliate commissions from qualifying purchases.
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