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Explore how CFR12J 3K3 1/8W resistors are selected and applied in circuits. Covers specifications, usage examples, and practical buying advice for South African makers.
3.3kOhm, 1/8W carbon film resistor with tight tolerance for reliable general-purpose use.
Suits signal conditioning, biasing, and pull-up/down roles in both educational and industry builds.
Available locally at Communica with VAT invoicing and branch pick-up for hassle-free supply.
A CFR12J 3K3 resistor is a 3.3 kilo-ohm (kOhm) carbon film resistor rated for 1/8 Watt (0.125W) power dissipation, with a 5% tolerance ("J" code). Widely used across electronics for signal limiting, biasing, and pull-up/pull-down functions, its affordable price and consistent performance make it ideal for a variety of circuits. South African students, technicians, and engineers often select these for breadboarding, prototypes, and educational demonstrations.
| Parameter | Value | Typical Use |
|---|---|---|
| Resistance | 3.3kOhm 5% | Signal limiting, bias networks |
| Power Rating | 0.125W (1/8W) | Low-power switching, logic |
| Tolerance | 5% | General purpose where exact resistance is not critical |
The 3K3 1/8W resistor is suitable for a broad range of low-power signal applications. Here are common use-cases found in South African classrooms, prototypes, and field devices:
At Communica, you'll find CFR12J 3K3 resistors from established international and local suppliers. Brands like Royal Ohm, UniOhm, and TE Connectivity are commonly stocked. Branch pickup (Samrand, Pretoria, Cape Town) and VAT-compliant invoicing are available for institutional orders and student budgets alike.
When designing, always factor in both the resistor's tolerance (for analog accuracy) and lead length (for PCB or breadboard compatibility).
Assess the suitability of the 3K3 1/8W resistor in your circuit using Ohm's Law and the power dissipation formula:
For example, in a 5V logic pull-up application:
I = 5V / 3300Ohm ~ 1.5mA
P = 5V x 0.0015A ~ 0.0075W
This is well below the 0.125W rating, so the CFR12J 3K3 is suitable here.
Suppose you want to illuminate a red LED at 2V drop from a 5V supply with a current near 1mA (suitable for indicator LEDs in low-power modes):
// ASCII Circuit Diagram
+5V ---[3K3]---|>|--- GND
LED
Explore Communica's Resistors & Passive Components collection for up-to-date stock and specification sheets. Stock checks and branch collection are available for Samrand and other main branches, so you can plan your project timelines confidently.
Free shipping for orders over ZAR 1,000.00.
Get a full refund if you had the product for less than 7 days.
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