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Learn how to use MFR25F 5R1 resistors in electronic projects. Covers specs, calculations, wiring, troubleshooting, and where to source locally via Communica.
The MFR25F 5R1 is a 5.1Ohm, 0.25W metal film resistor with reliable specs.
Learn how to calculate, wire, and use 5.1Ohm resistors in SA-context circuits.
Find MFR25F 5R1 resistors in stock at Communica for fast collection or delivery.
The MFR25F 5R1 is a metal film resistor with a resistance value of 5.1 ohms (Ohm), a power rating of 0.25 watts (W), and a 1% tolerance. As a common value within the E24 series, this resistor is often used for current limiting, pull-down/up, and biasing in digital and analog circuits. Its compact axial form factor makes it a staple for breadboards, protoboard builds, and PCBs found in student kits and industrial repairs across South Africa.
Metal film resistors such as the MFR25F type offer improved thermal stability and noise performance over standard carbon film variants. This makes them a good choice for audio, signal, instrumentation, and reference circuits, especially in education labs and field repairs that demand consistency.
| Parameter | Value | Notes |
|---|---|---|
| Resistance | 5.1Ohm (5R1) | E24 1% tolerance code |
| Power Rating | 0.25W (250mW) | Derate above 70 degreesC ambient |
| Max Voltage | Up to 250V | Check datasheet for exact spec |
| Tolerance | 1% | Tight for educational/precision work |
| Body Size | ~6mm x 2.2mm | Axial, fits breadboards/PCBs |
While the 5.1Ohm value is fixed, make sure the power rating (0.25W) is sufficient for your application. Check these criteria before soldering into your circuit:
Suppose you want to drive a red LED (forward voltage = 2V) from a 5V microcontroller rail. To set current close to 600mA (at the resistor's safe limit):
MFR25F resistors are supplied with axial leads, making them easy to insert into solderless breadboards, stripboard, or pre-drilled PCB pads. For reliable contact, always bend leads gently at 90 degrees angles (minimum 1.5x body length from body) and trim excess after soldering. This supports strong mechanical and electrical connections for both test rigs and final assemblies.
[5V] ---[MFR25F 5R1]---|<|---[GND]
(Resistor) (LED)
MFR25F 5R1 resistors are widely available in South Africa via Communica, both via the resistor category and stocked by the reel or in packs for schools, hobbyists, and production lines. Check branch stock levels at Samrand, Pretoria, and Cape Town, or arrange collection for urgent repairs. VAT invoices are supplied, supporting procurement for educational, industrial, and commercial labs.
Typical lead times are short for standard values like 5.1Ohm. If bulk or alternate power ratings are needed, Communica can often supply from their extensive local and international supplier network.
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