680k Ohm 0.5watt 5% Carbon Film Resistor

Description

Technical Overview of the 680k Ohm 0.5watt 5% CFR Resistor

The 680k Ohm 0.5watt 5% CFR Resistor is a high-resistance Carbon Film Resistor (CFR) designed for precision biasing, timing circuits, and high-impedance signal conditioning. With a resistance value of 680,000 Ohms, this component is essential for limiting current to micro-ampere levels, making it a staple in analog electronics and power supply feedback loops. The 0.5W (half-watt) power rating provides a superior thermal margin compared to standard 0.25W resistors, ensuring stability even in compact enclosures. At BuyCircuitParts, we supply industrial-grade 680k Ohm resistors to keep your high-gain amplifiers and timing modules “on track.”

Key Specifications and Color Code Identification

To ensure this resistor matches your circuit requirements, here are the technical parameters of the 680k Ohm 0.5watt 5% CFR Resistor:

• Resistance Value: 680k ohm(680,000 Ohms).

• Power Rating: 0.5 Watt (1/2 Watt).

• Tolerance: ±5% (Gold band).

• Type: Carbon Film Resistor (CFR).

• Color Code: Blue, Gray, Yellow, Gold (Blue-Gray-Yellow-Gold).

• Maximum Working Voltage: 350V.

• Operating Temperature: -55°C to +155°C.

Why Carbon Film (CFR) for High Resistance?

Carbon Film Resistors like the 680k Ohm 0.5watt 5% CFR Resistor are preferred in general-purpose electronics because they offer a better price-to-performance ratio than metal film for high-resistance values. The carbon film is deposited on a high-grade ceramic rod, providing excellent pulse stability. In high-resistance values like 680k, CFRs are particularly effective in audio and radio frequency (RF) circuits where a small amount of “soft” noise is acceptable or even desirable in vintage-style tone shaping. At BuyCircuitParts, we ensure our CFRs have high-purity coatings to prevent moisture ingress and resistance drift.

Common Applications for the 680k Ohm Resistor

The 680k Ohm 0.5watt 5% CFR Resistor is a versatile component found in various electronic designs:

1. Timing Circuits (RC Networks): Paired with capacitors to create long time constants in 555 timers or oscillation circuits.

2. Transistor Biasing: Setting the base current for high-gain NPN/PNP transistors in pre-amplifier stages.

3. LED Night Lights: Limiting current in high-voltage AC-powered LED indicators where high resistance is required.

4. Voltage Dividers: Used in high-impedance voltage sensing for battery monitoring and multimeters.

5. Bleeder Resistors: Safely discharging high-voltage capacitors in power supplies after the power is turned off.

Pro-Tips for Circuit Integration

To get the most reliable performance from your 680k Ohm 0.5watt 5% CFR Resistor, follow these professional tips:

• Voltage Limits: While this is a 0.5W resistor, high resistance values are often limited by “Maximum Working Voltage” rather than power. Ensure your circuit does not exceed 350V across this resistor to prevent arcing.

• Color Code Verification: Always verify the bands: Blue (6), Gray (8), Yellow (x10,000). The final Gold band confirms the 5% accuracy.

• Lead Forming: When using this resistor on a PCB, use a lead-bending tool to ensure the ceramic body is not stressed. Carbon film can be sensitive to micro-cracks if the leads are pulled aggressively.

• Biasing Stability: For very high-gain audio circuits, ensure the resistor is placed away from heat-generating components (like power transistors) to maintain a stable 680k Ohm value.

Why Buy from BuyCircuitParts?

As a specialized seller, we know that low-quality resistors can have “noisy” carbon layers or brittle leads. At BuyCircuitParts, our 680k Ohm 0.5watt 5% CFR Resistor stock is sourced from manufacturers who prioritize uniform film deposition. Our resistors feature high-conductivity tinned copper leads that ensure easy soldering and excellent mechanical strength. We provide components that meet strict industrial tolerances, helping you avoid circuit malfunctions and keeping your production “on track.”

Durability and Thermal Performance

The 680k Ohm 0.5watt 5% CFR Resistor is designed for longevity. Its flame-retardant coating protects the internal carbon film from environmental degradation and accidental overheating. Whether you are building a custom guitar pedal, a DIY sensor, or a professional power supply, this resistor provides the high-impedance stability your project demands. By choosing BuyCircuitParts, you are ensuring your bill of materials (BOM) consists of reliable, professional-grade hardware.

📐 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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