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Explore the uses of the CFR100J-4K7 carbon film resistor: specs, circuit roles, application tips, and local sourcing for South African learners and engineers.
4.7kOhm, 1W carbon film resistor with versatile electronic circuit use.
Voltage dividers, signal conditioning, pull-ups, and current limiting.
Find CFR100J-4K7 and alternatives at Communica with fast branch collection.
The CFR100J-4K7 is a widely used carbon film resistor, marked with a resistance of 4.7 kOhm and rated for 1W power dissipation. In South African electronics design, this part is valued for its affordability, general-purpose performance, and broad circuit compatibility.
Makers, students, and technicians will encounter it in analog, digital, and mixed-signal applications - from microcontroller pull-ups to amplifier feedback networks.
| Parameter | Value | Notes |
|---|---|---|
| Resistance | 4.7 kOhm (4700Ohm) | E12 series value, identified by 4K7 code |
| Rated Power | 1 Watt | Check thermal limits for your design |
| Tolerance | 5% | Standard for carbon film types |
| Max Voltage | 350V | Do not exceed for safety |
| Body Type | Axial (Through Hole) | Fits breadboard & standard PCBs |
Tip: The '4K7' marking is a shorthand for 4.7 x 1,000Ohm = 4,700Ohm. This is standard industry notation in South Africa and worldwide for compact component marking.
This resistor works across a diverse range of circuits. You'll find it in:
Its 1W rating ensures better thermal headroom than typical 0.25W or 0.5W resistors, making it well-suited for both student lab builds and industrial-grade PCBs. Local availability ensures fast turnaround for urgent repairs or project deadlines.
| Model | Type | Power | Tolerance | Application |
|---|---|---|---|---|
| CFR100J-4K7 | Carbon Film | 1W | 5% | General, medium power |
| CFR25J-4K7 | Carbon Film | 0.25W | 5% | Low-power signal lines |
| MF58-4K7 | Metal Film | 0.5W | 1% | Precision, low drift |
Communica supplies this and related resistor types from major global and locally trusted brands. Browse the resistor collection to check availability, compatible alternatives, and volume pack sizes for schools or industry projects. Note: Lead times are minimal for standard E12 values such as 4K7, especially for branch collections at Samrand, Pretoria, or Cape Town.
Choosing the CFR100J-4K7 (versus other 4.7kOhm resistors) depends on:
For current-limiting roles (like series resistors on LEDs), it's key to check the actual power dissipated to avoid thermal failure:
Microcontroller Input Pull-up: Vcc (3.3V or 5V) | [4K7] | PIN (MCU GPIO) | GND
LED Current Limiting: Vcc (12V) | [4K7] | anode(LED)cathode | GND
The CFR100J-4K7 works directly in both breadboard prototypes and soldered final builds. If you have high pulse or surge currents in your load, always check if the part's pulse rating matches your needs by reviewing the brand datasheet.
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