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Learn how and where to use MFR12F-100R resistors in circuits. Explore specs, calculations, practical examples, and local tips for sourcing at Communica.
Key parameters of the MFR12F-100R resistor for circuit design.
How to pick and use 100Ohm metal film resistors for reliable results.
Stock, lead times, and local availability at Communica branches.
The MFR12F-100R is a 100-ohm, 1/8 watt, metal film fixed resistor with a 1% tolerance. Commonly used across hobby project, education lab, and commercial circuits, this resistor offers reliable performance where precision and stability are valued. In South Africa, 100Ohm metal film resistors like the MFR12F-100R are widely available and form a staple component for both beginner kits and advanced designs.
| Parameter | Value | Notes |
|---|---|---|
| Resistance | 100Ω (Ω = ohm) | Marked as "100R"; E24/E96 code |
| Tolerance | ±1% | Precision (metal film) |
| Power Rating | 0.125W (1/8W) | Ambient temp: 70°C Derate above |
| Temperature Coefficient | < 100ppm/°C | Stable over range |
| Body Type | Axial, through-hole | Fits breadboards/PCBs |
Communica sources 100Ohm metal film resistors from multiple trusted brands, including major global manufacturers and education-friendly value lines. Bulk packs and single units are typically available ex-stock at Samrand and Cape Town branches. Students benefit from VAT-ready invoicing for labs and competitions, and industry can request formal quotes.
Suppose you need to limit current to an LED (forward voltage 2V), using a 5V supply. The resistor will drop 3V (5V - 2V).
This value is suitable for standard indicator LEDs. If you want to drop the current to 20mA, choose a higher resistance (e.g., 150Ohm).
This is safely below the 0.125W (1/8W) rating for the MFR12F-100R, making it ideal for such loads. For multiple LEDs or higher voltage, consider total dissipation.
For analog scaling, combining a 100Ohm resistor with another value forms a divider. Example: measuring a sensor signal and scaling to microcontroller ADC range.
Vout = Vin x (R2 / (R1 + R2)) If Vin = 5V, R1 = 900Ohm, R2 = 100Ohm: Vout = 5V x (100 / 1000) = 0.5V
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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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