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Learn how to choose substitutes for the CFR12J-100R 100Ohm carbon film resistor. Compare specs, brands, and availability for South African projects with advice from Communica.
Understand which ratings matter most when replacing a CFR12J-100R resistor.
See common equivalent resistors, including metal film and carbon film options.
Find local stock and brand alternatives at Communica branches.
The CFR12J-100R is a 100Ohm, 1/4 watt, carbon film resistor with a 5% tolerance. Widely used for general-purpose applications-prototyping, education, and repairs-this resistor is a staple in South African electronics projects. When this specific part is out of stock or you need a functionally equivalent replacement, understanding specification requirements ensures your substitute is safe and reliable.
| Spec | Value |
|---|---|
| Resistance | 100Ohm |
| Power Rating | 0.25W (1/4W) |
| Tolerance | 5% (colour code: brown-black-brown-gold) |
| Type | Carbon Film, Axial Leaded |
When the exact CFR12J-100R isn't available, look for an equivalent or better-rated resistor. Focus on the following core parameters:
Both carbon film and metal film resistors are widely available in South Africa. Metal film variants are often used as direct substitutes due to improved noise performance and tighter tolerance, sometimes at a similar price point-especially in 100Ohm values. For educational and most general electronics, both technologies are suitable, unless the design is sensitive to noise or requires higher precision.
| Feature | Carbon Film | Metal Film |
|---|---|---|
| Typical Tolerance | 5% | 1% to 5% |
| Noise | Moderate | Low |
| Cost | Low | Low/Moderate |
| Availability | Very High | High |
If a circuit is not highly sensitive, a 5% or 1% resistor works equally well as a replacement. For a 100Ohm 5% resistor, the actual resistance may vary from 95Ohm to 105Ohm.
Suppose the resistor drops 4V in your design. To confirm if a 0.25W substitute is safe:
| Parameter | Formula | Example Value |
|---|---|---|
| Current (I) | I = V/R | I = 4V / 100Ohm = 0.04A |
| Power (P) | P = I2 x R = V2 / R | P = (0.04A)2 x 100Ohm = 0.16W |
| Type | Tolerance | Brand Examples | Communica Link |
|---|---|---|---|
| Carbon Film 1/4W | 5% | Generic, Uniohm | Resistors |
| Metal Film 1/4W | 1%, 2%, 5% | YAGEO, KOA | Resistors |
| Carbon Film 1/2W | 5% | Generic, Panasonic | Resistors |
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.
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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