680 Ohm 0.5watt 5% Carbon Film Resistor
₹0.49
Reliable 680 ohm carbon film resistor rated at 1/2 watt with ±5% tolerance, ideal for current limiting, biasing, and signal filtering in various electronic circuits.
500 in stock
Description
Technical Overview of the 680 Ohm 0.5watt 5% CFR Resistor
The 680 Ohm 0.5watt 5% CFR Resistor is a versatile passive component designed for medium-power applications that require reliable current limiting and voltage dropping. With a resistance value of 680 Ohms, it is a staple in electronic prototyping, especially for driving LEDs from 12V or 9V power sources. The 0.5W (half-watt) power rating offers double the heat dissipation capacity of standard 0.25W resistors, making it a safer and more durable choice for continuous-duty circuits. At BuyCircuitParts, we ensure our 680 Ohm CFRs meet high industrial standards to keep your projects stable and “on track.”
Key Specifications and Color Code Identification 680 Ohm 0.5watt 5% CFR Resistor
To ensure this resistor is the correct fit for your PCB, here are the technical parameters:
Resistance Value: 680 ohm
Power Rating: 0.5 Watt (1/2 Watt).
Tolerance: ±5% (Gold band).
Type: Carbon Film Resistor (CFR).
Color Code: Blue, Gray, Brown, Gold (Blue-Gray-Brown-Gold).
Maximum Working Voltage: 350V.
Operating Temperature: -55°C to +155°C.
Why Choose 0.5W Carbon Film for General Electronics?
Carbon Film Resistors like the 680 Ohm 0.5watt 5% CFR Resistor provide a balance of stability and cost-efficiency. In many DIY and industrial circuits, 1/4W resistors can run hot if the current is sustained. Moving to a 0.5W rating ensures that the resistor stays cooler, which prevents the resistance value from “drifting” due to heat. CFR technology uses a thin layer of carbon deposited on a ceramic core, providing excellent pulse endurance compared to thin-metal film alternatives. At BuyCircuitParts, our resistors are coated with high-quality insulation to ensure they operate reliably even in humid environments.
Common Applications for the 680 Ohm Resistor
The 680 Ohm 0.5watt 5% CFR Resistor is highly popular in various electronic configurations:
LED Current Limiting: Ideally suited for 12V DC circuits where you need to drive a standard LED at safe current levels (~15-20mA).
Audio Preamps: Used in gain-setting and feedback networks for amplifiers and guitar pedals.
Transistor Switching: Acting as a base-current limiter for transistors in digital-to-analog interface circuits.
Voltage Dividers: Providing a fixed resistance in voltage sensing paths for microcontrollers.
Termination Resistors: Used in communication lines to prevent signal reflection and noise.
Pro-Tips for Circuit Integration
To maximize the life of your 680 Ohm 0.5watt 5% CFR Resistor, keep these professional tips in mind:
Power Calculation: Use Joule’s Law ($P = I^2 \times R$) to ensure your actual power usage is below 0.5W. For 680 Ohms, the maximum safe current is approximately 27mA.
Verification: Always check the color bands: Blue (6), Gray (8), Brown (x10). This identifies it as 680 Ohms. The Gold band indicates a 5% tolerance.
Spacing: If you are running multiple 0.5W resistors near each other, leave at least 3mm of space between them to allow for proper airflow and heat dissipation.
Lead Handling: Avoid bending the leads too close to the resistor body. Use a small pair of pliers to provide strain relief to the ceramic core during installation.
Why Buy from BuyCircuitParts?
As a specialized seller, we understand that even a simple resistor needs to be dependable. At BuyCircuitParts, our 680 Ohm 0.5watt 5% CFR Resistor stock is sourced from manufacturers who prioritize uniform carbon film deposition and high-grade copper leads. We provide components with consistent color-coding and clean leads for easy soldering. With our fast shipping and technical expertise, we help you build high-performance electronics and keep your assembly “on track.”
Durability and Environmental Performance
The 680 Ohm 0.5watt 5% CFR Resistor features a flame-retardant coating that protects the resistor from environmental oxidation and accidental over-current situations. This ruggedness makes it suitable for both hobbyist breadboards and industrial control panels. By choosing your passive components from BuyCircuitParts, you are ensuring your project is built with reliable hardware designed for long-term operational stability.
📐 Dimensions (Approx):
Length: 9.2 mm × Diameter: 3.2 mm
Lead Length: ~28 mm (adjustable)
🧊 Note:
Product colour and markings may vary slightly based on manufacturer and batch. Functionality is guaranteed. (Refer to the product image for illustration only. For precise specifications, consult the datasheet.) For a detailed breakdown of resistor technology and standards, visit the Resistor Technology Wikipedia Page.
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Additional information
| Weight | 5 g |
|---|---|
| Dimensions | 9 × 0.2 × 0.2 cm |
| HSN | 85331000 |
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