10pcs 330 ohms 5 band resistor 1/4w

🔹 10PCS 330 Ohm (330Ω) Metal Film Resistor – 1/4 Watt, 5-Band

High-precision, low-noise metal film resistors with a 330 ohm value and 1% tolerance. Identified by a 5-band color code, these components are essential for precision current limiting, pull-up/down networks, and voltage dividers where stable and accurate resistance is critical.

✅ Specifications:

• Resistance: 330 Ohms (330Ω)

• Tolerance: ±1% (Indicated by Brown 5th band)

• Power Rating: 1/4 Watt (0.25W)

• Type: Metal Film (Precision, Low Noise)

• Band Code: 5-Band

  • 1st Band: Orange (3)

  • 2nd Band: Orange (3)

  • 3rd Band: Black (0)

  • 4th Band: Black (Multiplier x 1)

  • 5th Band: Brown (±1%)

• Package: Axial Leads

• Lead Spacing: Standard ~10mm (0.4″)

• Temperature Coefficient: Typically ±50 to ±100 ppm/°C

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

• Quantity: 10 pieces

⚙️ Key Features:

• High Precision: 1% tolerance ensures the actual resistance is tightly centered around 330Ω (range: 326.7Ω to 333.3Ω), essential for accurate circuit performance.

• Low Noise: Metal film construction generates significantly less inherent noise than carbon film, making them perfect for sensitive analog and audio circuits.

• Stable with Temperature: Lower temperature coefficient means resistance changes less with temperature fluctuations compared to carbon film.

• Clear 5-Band Coding: The extra band allows precise identification of both value and tolerance.

• Reliable & Durable: Robust construction for long-term stability in demanding applications.

📦 Typical Applications:

• Precision Current Limiting: For LEDs, lasers, or other components where exact current control is needed.

• Pull-Up/Pull-Down Resistors: For digital logic circuits, I2C buses, and microcontroller GPIO pins where a precise value is specified.

• Voltage Dividers: Used with other precision resistors to create accurate reference voltages.

• Feedback Networks: In op-amp circuits for setting precise gain.

• Impedance Matching & Termination: In signal lines where precise impedance is required.

• General High-Accuracy Circuits: Any design where component tolerance directly impacts performance.

🔧 Usage & Calculations:

• Ohm’s Law (for Safe Operation):

  • Max Continuous Current: Imax=P/R=0.25/330≈0.0275AImax​=P/R​=0.25/330​≈0.0275A or 27.5mA.

  • Max Voltage Drop: Vmax=P×R=0.25×330≈9.1VVmax​=P×R​=0.25×330​≈9.1V.

• Power Dissipation: Always calculate actual power: P=I2RP=I2R or P=V2/RP=V2/R. Keep dissipation well below 0.25W (e.g., < 0.2W) for reliability and to minimize self-heating.

• Common LED Example: For a 5V supply and a typical 2V LED:
  $R=(5V-2V)/0.020A=150\Omega$.
  Using a 330Ω resistor would result in a current of $(5V-2V)/330\Omega \approx 9mA$, producing a dimmer but safe glow.

⚠️ Important Considerations:

• Power Limitation: The 1/4W rating is for low-power applications only. For higher power, use resistors with a higher wattage rating.

• Precision Handling: While 1% is precise, for the most critical circuits, measure and select matched resistors.

• Heat Management: Avoid placing near heat sources to prevent value drift.