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Get the full technical details for the CFR12J 22KOhm carbon film resistor-tolerances, ratings, and use-cases for South African projects. View specs, examples, and local advice.
Understand ratings, tolerance, and lead spacing for hassle-free circuit design.
How to match CFR12J 22K to your needs using Ohm's law and real-world application tips.
Find stock, compare with other resistor types, and check lead times locally at Communica.
The CFR12J 22K is a carbon film fixed resistor with a resistance value of 22,000 ohms (22 kOhm). Known for its general-purpose reliability and cost-effectiveness, this part is widely used in South African hobbyist, educational, and professional builds. Common applications include voltage dividers, pull-ups/pull-downs, timing circuits, and basic signal conditioning.
CFR12J series resistors are manufactured to international standards for consistent performance. Here's a summary of their primary specifications for the 22KOhm variant:
| Parameter | Value (CFR12J 22K) |
|---|---|
| Resistance | 22,000 Ohm (22 kOhm) |
| Power Rating | 0.25W (1/4 watt) at 70 degreesC |
| Tolerance | 5% (J) |
| Temperature Coefficient | 350 ppm/ degreesC (typical) |
| Max Working Voltage | 250 V |
| Lead Pitch / Body Length | About 6.3mm body, ~25mm lead length |
| Body Type | Axial, epoxy-coated |
| RoHS/Lead-Free | Typically Yes (check package or datasheet) |
The "CFR" prefix denotes Carbon Film Resistor, "12" is the series/family (1/4 watt size), and "J" indicates 5% tolerance. These values make the component a good fit for most non-critical analog and digital circuits at student, hobby, or light industrial levels.
Most CFR12J 22K resistors are marked with four bands: red, red, orange (value), and gold (tolerance).
Always verify with a multimeter when in doubt, especially in mixed-stock environments.
When choosing the CFR12J 22K for your circuit, consider:
Suppose you're limiting current into an LED using a CFR12J 22K resistor at 12V. To ensure you're within safe margins:
If your design draws more current or handles higher voltages (closer to 250V), always recalculate power and consider higher-wattage series if necessary.
| Type | Power (W) | Tolerance (%) | Temp Coeff. | Key Use |
|---|---|---|---|---|
| CFR12J 22K (Carbon Film) | 0.25 | 5 | 350 ppm/ degreesC | General purpose |
| MFR25 22K (Metal Film) | 0.25 | 1 | 100 ppm/ degreesC | Precision, low-noise |
| CFR16J 22K | 0.125 | 5 | 350 ppm/ degreesC | Compact builds |
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