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Explore the specifications and applications of CFR25J 8K2 resistors. Learn selection, usage, and practical circuit examples with SA buying tips from Communica.
Learn resistance, power, tolerance, and South Africa sourcing insights.
See how to size, connect, and troubleshoot 8.2kOhm resistors in real builds.
Practical advice for students, engineers, and buyers sourcing from Communica.
The CFR25J 8K2 is a widely used carbon film fixed resistor with an 8.2kOhm (8,200Ohm) resistance, commonly found in South African workshops, labs, and classrooms. The code "CFR25J 8K2" breaks down as:
These resistors are general-purpose, cost-effective, and suitable for signal conditioning, voltage dividers, pull-up/down functions, and basic current limiting in both educational and industrial builds.
| Parameter | Value | Notes |
|---|---|---|
| Resistance | 8.2 kOhm (8K2) | IEC color code: Grey-Red-Red-Gold |
| Power Rating | 0.25 W (1/4 watt) | Ambient 25 degreesC, derate above 70 degreesC |
| Tolerance | 5% (J) | Suitable for general use, not for precision circuits |
| Maximum Working Voltage | 250 V | Refer to individual datasheet for brand variations |
Local engineering curricula and technical schools frequently use CFR25J 8K2 resistors for demonstrations and lab prototyping due to their low price and broad applicability.
When specifying resistors in practical builds, consider:
To protect a standard red LED (forward voltage 2V, max current 20mA) from a 5V source:
On a Raspberry Pi or Arduino digital input pin, use CFR25J 8K2 to ensure a pin reads LOW when not actively driven:
[3.3V] | | [Switch] | +---[input] | [8.2kOhm] | [GND]
For sensors requiring voltage scaling, pair a CFR25J 8K2 with another resistor to form a simple divider. Example:
| Input Voltage (Vin) | R1 | R2 (CFR25J 8K2) | Output Voltage (Vout) |
|---|---|---|---|
| 12 V | 10 kOhm | 8.2 kOhm | ~5.5 V |
Use Vout = Vin x (R2 / (R1 + R2)) to size dividers for ADC or logic inputs.
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