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Learn how to choose and use MFR25F 50Ohm metal film resistors. Covers specs, tolerances, circuit examples, power ratings, and practical selection for South African projects.
Metal film 50Ohm resistors ideal for accurate, stable circuit applications.
How to size and apply 1/4W resistors effectively in real projects.
Communica stocks trusted 50Ohm MFRs with quick collection or delivery.
The MFR25F 50Ohm resistor is a 1/4 watt, 50 ohm, axial-lead metal film resistor popular in both analog and digital circuit designs. Its key advantages include tight tolerance (1%), low noise, and stable operation over temperature, making it suitable for biasing, signal path, and termination applications. Locally, 50Ohm resistors are widely used for:
| Parameter | MFR25F 50Ohm Spec | Typical Value/Remark |
|---|---|---|
| Resistance | 50Ohm | 1% |
| Power Rating | 0.25W (1/4W) | Ambient 70 degreesC |
| Max Working Voltage | 250V | Check for pulsed loads |
| Tolerance | 1% | High accuracy |
| Temperature Coefficient | <=100ppm/ degreesC | Stable response |
These characteristics make the MFR25F 50Ohm suitable for everything from oscillators and attenuators (RF/LF), through to power/sense circuits in commercial, academic, or hobby projects. For student labs, the 1% precision aids circuit repeatability.
Correct resistor selection goes beyond resistance value. Key considerations:
Suppose you want to light a 20mA standard red LED from a 5V supply, targeting 20mA current. You need:
Always check your current calculations, and ensure the total power (P = I2R) is well below 0.25W. In this example, using a MFR25F 50Ohm at 60mA yields P = (0.06)2 x 50 = 0.18W, within safe limits for occasional use.
For accurate design, use these formulas:
In RF systems (test loads, coax termination), a 50Ohm resistor is used to match characteristic cable impedance. Simple ASCII schematic:
Signal/Source -----/\/\/\----- Ground (MFR25F 50Ohm)
This prevents signal reflection for accurate scope or network analyzer measurements. For attenuators, two resistors (one in series, one to ground) create voltage dividers designed with precise values - the 1% tolerance assures low error.
Major brands available at Communica include UniOhm, Royal Ohm, Yageo, and sometimes Vishay. If project schedules are tight, consult availability ahead of time, especially before semester labs or SA electronics competitions.
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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Ordered online, was just after 6am. Asked if I can pick items up as I wanted to install over the weekend and delivery stated 2-4 working days. Though...
Online support and communication is next level - great communication, fast response - very helpfull, recomended supplier - online payment was no hasse...
He's polite, good with people and made me feel free to talk.. all in all he's helpful
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Best service received from Rocket! What a pleasure dealing with him. Thank you Rocket
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Excellent service so far
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Sydney and Nicole were absolutely fantastic and helped me with my purchases. Thank you.
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They have mostly any electronic tool and components that you may require - Thanks to Nicole for helping me.
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One of the cashier services rendered to me was here at communica by the lady named Nicole and her manager dolly they were both willing to go above and...
The service was excellent, Nicole and Rehaan were very helpful and professional in their work.
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Mohamed Sharief is a great asset to Communica. He provides a 5 star service and good product knowledge. Keep up the good work.
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Quick quality customer service.
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Very good service and a happy welcoming smile from the cashier Nicole
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Verified customerNicolene
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After being supplied the incorrect track for my garage motor, despite me asking twice if it was the correct track, I had to return to the store to exc...
They have most every electronics component you might need. Staff are knowledgeable and friendly. I was looking for a bespoke miniature item for a lapt...
Great service as always from Nicole and Sydney especially Mpho at the sales desk
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I visit Communica once in a blue moon. Always wish i have more time to look at everything. Good & friendly service. Nothing wrong with a queuing syste...
Currently have only purchased items from their on-line store. Received what I ordered plus quick delivery. No complaints to date.
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I needed a heat-sensitive diode as one of my Philips appliances had had a failure. Philips wants you to throw the entire thing away, but I tried look...
I got the most pleasant service from Sydney and Windie
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