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Detailed guide on the CFR12J-270R resistor versus carbon film, metal oxide, and wirewound types. Learn specifications, local stock, applications, and advantages for SA makers and professionals.
Key characteristics, tolerances, and footprint for practical use.
Table of advantages and limitations for metal film, carbon film, wirewound.
Availability, brands, and buying advice from Communica branches.
The CFR12J-270R is a metal film resistor with a nominal value of 270 Ω, commonly used in education, industry, and hobbyist builds throughout South Africa. With numerous resistor types on the market-carbon film, metal oxide, and wirewound-it's crucial to understand where the CFR12J-270R excels and when another style might be better suited. This comprehensive guide helps South African students, engineers, and makers choose confidently for circuits from prototyping to repair.
| Attribute | CFR12J-270R |
|---|---|
| Type | Metal Film |
| Resistance | 270 Ω ±5% (J tolerance) |
| Power Rating | 0.5W (1/2W) |
| Temperature Coeff. | ±200ppm/ degreesC (typical for metal film) |
| Leads / Mounting | Axial, 12mm body (approx.) |
| Application Areas | Signal filtering, voltage dividers, biasing, general builds |
| Type | Tolerance | Noise | Recommended Use |
|---|---|---|---|
| CFR12J-270R / Metal Film | 5% (±) | Low | Audio, signal, precision biasing |
| Carbon Film | 5-10% | Moderate | General use, cost-driven projects |
| Metal Oxide | 2-5% | Moderate | Power supplies, surge circuits |
| Wirewound | 1-5% | Low | High-power, load applications |
Suppose your circuit will pass 25mA through a 270Ohm resistor (like CFR12J-270R) connected across 6.75V:
Since CFR12J-270R is rated for 0.5W, 169mW is well within its safe range, leaving enough margin for typical ambient conditions in South African labs and workshops.
CFR12J-270R and equivalent metal film resistors are regularly stocked at Communica branches (Samrand, Cape Town, Pretoria) and online. Other trusted brands supplied include Yageo, Royal Ohm, and Uniohm. For quick pickup, confirm stock via Communica's Passive Components collection or visit your nearest branch.
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