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Pricelist: Retail Price (B2C) Pricelist
120 Ohm 0.25W Carbon Film Resistor - 5% Tolerance (Pack of 5)

120 Ohm 0.25W Carbon Film Resistor - 5% Tolerance (Pack of 5)

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ComponentSpecification
Resistance Value120 Ohms (120 Ω)
Power Rating0.25 Watts (1/4 Watt)
Tolerance±5% (J Type)
ConstructionCarbon Film
Package TypeThrough-Hole (Axial)
QuantityPack of 5 Units
Price
₹ 8.47 ₹ 8.47
(Tax included)

Product Description: The 120 Ohm 1/4 Watt Resistor is a reliable passive component used for precise current regulation and circuit protection. These carbon film resistors feature a 5% tolerance, ensuring consistent electrical behaviour for general-purpose applications. With a standard 0.25W power rating, they are frequently used for driving LEDs from 5V logic, signal conditioning, and as basic termination resistors in digital communication lines.

Key Features

  • LED Driver Optimised: Ideal for providing approximately 25-30mA to standard LEDs when powered by a 5V source.

  • Axial Through-Hole Design: Long, flexible leads ensure a secure fit in breadboards and easy soldering on prototyping boards.

  • Standard Colour Coding: Features the 4-band colour code (Brown, Red, Brown, Gold) for rapid manual identification.

  • Low Noise Performance: Carbon film construction minimises electrical noise, suitable for high-impedance signal paths.

  • Safety Coating: Finished with a flame-retardant lacquer to provide environmental protection and prevent combustion during overloads.

Technical Details

  • Maximum Working Voltage: Rated for stable operation up to 250V AC/DC in standard circuit environments.

  • Overload Surge Capacity: Can withstand temporary peak voltages up to 500V for short durations.

  • Dielectric Strength: Offers insulation protection up to 500V AC between the resistive element and external contact.

  • Operating Temperature: Maintains accurate resistance values within a range of -55°C to +155°C.

  • Temperature Coefficient: Typically rated at ±450 ppm/°C, ensuring thermal stability during continuous operation.

  • Lead Material: Solder-plated copper-clad steel leads for high conductivity and excellent solder wetting.

  • Resistance Stability: Engineered to stay within ±3% of the nominal value after 1,000 hours of use at maximum load.

  • Miniature Body Size: Compact axial dimensions (approx. 2.3mm x 6.5mm) for high-density component layouts.

  • Environmental Compliance: Fully RoHS-compliant and lead-free for modern manufacturing standards.

  • Inductive Reactance: Low parasitic inductance makes it suitable for basic RF filtering and high-speed logic.

  • Standard Precision: Class J (±5%) provides a cost-effective balance for hobbyist and educational projects.

  • Moisture Resistance: Sealed with multiple epoxy layers to prevent oxidation of the carbon element.

Prototyping and Engineering Tips from Robogears

  • 9V Battery Use: In 9V battery projects, a 120 Ohm resistor is an excellent choice for high-power indicator LEDs, providing roughly 60mA (ensure the LED is rated for this current).

  • 18650 Monitoring: Use as part of a voltage divider for 18650 cell monitoring to provide a stable reference voltage for an analogue-to-digital converter (ADC).

  • IC & Driver Support: Ideal for protecting the output pins of microcontrollers like Arduino or ESP32 when interfacing with optoisolators or small transistors.

  • Related Products: We recommend pairing these with our Half-Size Breadboards and 22 AWG Jumper Wires.

Package Includes

  • 5 x 120 Ohm 1/4 Watt Carbon Film Resistors.

Disclaimer: Images are for illustration purposes only. Always calculate the power dissipation in your circuit to ensure it stays below 0.25W to avoid component overheating.