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Deep dive on MFR25F 47kOhm resistors versus other common types. Learn selection, applications, and sourcing for SA students, makers, and engineers.
Metal film, 0.25W rating, tight tolerance-ideal for precision and low-noise work.
See how metal film, carbon film, wirewound, and SMD differ in specs & applications.
Compare availability, lead time, and best use in South African projects.
The MFR25F 47kOhm is a metal film resistor, typically rated for 0.25W (1/4 watt), 1% tolerance, and used in circuits requiring precise resistance and low noise. This specific part is popular amongst South African education, maker, and industry circles, as it offers a balance of affordability and electrical stability for signal processing and analog work.
| Type | Usual Wattage | Typical Tolerance | Noise | Typical Use |
|---|---|---|---|---|
| Metal Film (e.g., MFR25F) | 0.125-2W | 1% (down to 0.1%) | Low | Analog, audio, measurement |
| Carbon Film | 0.25-2W | 5% (2% versions exist) | Medium | General, prototyping, cost-sensitive |
| Wirewound | 1-50W | 1% - 5% | Very Low | Power, current-sensing |
| SMD (Thick/Thin Film) | 0.063-0.5W (size dependent) | 0.5% - 5% | Low | PCB/SMT assembly |
For any resistor, use:
I = V / R and P = I2 x R = V2 / R
Example: You want to drop 4.7V across a 47kOhm resistor. Current is:
I = 4.7V / 47,000Ohm = 0.1mA
Power dissipated: P = (0.1mA)2 x 47,000Ohm = 0.47mW
Well within a 0.25W (250mW) rating.
| Attribute | MFR25F 47kOhm | Carbon Film 47kOhm | Wirewound 47kOhm |
|---|---|---|---|
| Tolerance | 1% | 5% | 1%-5% |
| Noise | Low | Medium | Lowest |
| Max Power (same size) | 0.25W | 0.25W | Often >1W |
| Cost (ZA) | Low | Lowest | Medium/High |
Explore the Resistors category at Communica for up-to-date stock of MFR, carbon, SMD, and power resistors. Refer to manufacturer datasheets for fine details; for large education projects, consider discussing lead time and stock allocation with the local branch.
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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