10pcs 220 ohms 5 band 1/4w

🔹 10PCS 220 Ohm (220Ω) Metal Film Resistor – 1/4 Watt, 5-Band

High-precision, low-noise metal film resistors with a 220 ohm value and 1% tolerance. Identified by a 5-band color code, these components are essential for precision current limiting, pull-up/down networks, voltage dividers, and termination circuits where stable and accurate resistance is critical.

✅ Specifications:

• Resistance: 220 Ohms (220Ω)

• 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: Red (2)

  • 2nd Band: Red (2)

  • 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 220Ω (range: 217.8Ω to 222.2Ω).

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

• Excellent Stability: Low temperature coefficient means resistance changes very little with temperature fluctuations.

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

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

📦 Typical Applications:

• Precision LED Current Limiting: For LEDs requiring specific brightness control (e.g., with a 5V supply and 2.1V LED: ~13mA).

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

• Series Termination Resistors: For digital signal lines (SPI, UART) to reduce ringing and signal reflections.

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

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

• 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=0.25/220≈0.0337A_Imax_​=P/R_​=0.25/220​≈0.0337_A or 33.7mA.

  • Max Voltage Drop: Vmax=P×R=0.25×220≈7.4V_Vmax_​=P_×_R_​=0.25×220​≈7.4_V.

• Power Dissipation: Always calculate actual power: P=I2R_P_=I_2_R or P=V2/R_P_=_V_2/R. Keep dissipation well below 0.25W (e.g., < 0.2W) for reliability.

• Common Use Case: A classic pull-up value for I2C buses and general digital logic, providing a good balance between speed and power consumption.

⚠️ Important Considerations:

• Power Limitation: The 1/4W rating is for low-power, signal-level applications only. For higher power (e.g., power LEDs), use resistors with a higher wattage rating.

• Precision Handling: While 1% is precise, for the most critical circuits (e.g., precision voltage references), consider measuring and selecting matched resistors.

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

• Not for High-Current Shunts: This is a precision signal resistor, not a power shunt. For current sensing above ~50mA, use a dedicated milliohm shunt.