680 Ohm 0.5W Carbon Film Resistor - 5% Tolerance (Pack of 5)

Product Description The 680 Ohm 1/2 Watt Resistor is a high-reliability passive component optimized for current regulation and signal biasing in medium-power electronics. Featuring an upgraded 0.5W power rating, this resistor provides double the thermal dissipation capacity of standard variants, making it an excellent choice for driving LEDs in 12V to 24V systems or as a stable base resistor for power transistors. Its 5% tolerance and rugged carbon film construction ensure consistent electrical performance across a wide range of industrial repair and professional prototyping applications.

Key Features

• Enhanced Thermal Management: The 1/2 Watt rating ensures the component operates cooler in continuous-duty circuits, reducing thermal resistance drift.

• Versatile Current Limiting: A standard value for protecting indicator lights and small semiconductors in automotive and industrial projects.

• Breadboard Ready: Features sturdy, tin-plated axial leads designed for a secure mechanical fit in solderless breadboards.

• Instant Value Identification: Marked with a clear 4-band color code (Blue, Gray, Brown, Gold) for rapid manual sorting and verification.

• Safety Grade Coating: Finished with a flame-retardant lacquer to enhance durability and prevent oxidation in humid environments.

Technical Details

• Maximum Working Voltage: Rated for stable continuous operation up to 350V AC/DC.

• Overload Surge Capacity: Can withstand short-duration peak surges up to 700V without immediate failure.

• Operating Temperature Range: Reliable performance maintained across a wide thermal range of -55°C to +155°C.

• Temperature Coefficient: Typically rated at ±450 ppm/°C, ensuring minimal drift during high-load operation.

• Dielectric Strength: Provides insulation protection up to 500V AC between the resistive element and surroundings.

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

• Resistance Stability: Engineered to maintain values within ±3% after 1,000 hours of operation at maximum rated load.

• Robust Body Construction: Larger axial size facilitates superior air convection compared to smaller 1/4W variants.

• Environmental Standards: Fully RoHS compliant and lead-free for modern electronic assembly requirements.

• Low Parasitic Inductance: Suitable for high-speed switching power supplies and basic signal damping.

• Moisture Protection: Sealed with multiple epoxy layers to prevent oxidation of the carbon film in humid conditions.

• Failure Mode: Designed to fail open-circuit under extreme overloads to protect sensitive downstream ICs.

• Precision Class: Standard Class J (±5%) providing a cost-effective solution for power-hungry projects.

• Solderability: Meets industrial standards for both manual soldering and automatic wave soldering processes.

• Indefinite Shelf Life: Protective lacquer ensures leads and element remain viable for long-term storage without degradation.