10pcs 220k ohms 5 band resistor 1/4w

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

High-precision metal film resistors with a 220,000 ohm value and 1% tolerance. Identified by a 5-band color code, these components are essential for high-impedance circuits, precision voltage dividers, timing applications, and feedback networks where stable and accurate high-value resistance is critical.

✅ Specifications:

• Resistance: 220,000 Ohms (220kΩ)

• 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: Orange (Multiplier x 1000)

  • 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 220kΩ (range: 217.8kΩ to 222.2kΩ).

• Low Noise: Metal film construction generates significantly less inherent noise than carbon film, critical for sensitive high-impedance amplifier stages.

• Excellent Stability: Low temperature coefficient means minimal resistance change with temperature, ensuring consistent performance in timing and reference circuits.

• High-Impedance Design: Ideal for circuits where minimal loading of the signal source is required.

• Clear 5-Band Coding: Allows precise identification of both value and tolerance.

📦 Typical Applications:

• Precision High-Value Voltage Dividers: For sensor scaling (e.g., high-resistance thermistors), probe attenuation, and high-voltage measurement.

• Op-amp Feedback Networks: Setting high gain or precise attenuation in inverting/non-inverting configurations.

• RC Timing Circuits: Creating long time constants with small capacitors in oscillators, filters, or power-up delay circuits (e.g., with a 1µF capacitor, τ = 0.22 seconds).

• Pull-Up Resistors: For very low-power digital circuits or open-drain outputs where high value is needed to minimize current draw.

• Input Impedance Buffers: Providing high input impedance for piezoelectric sensors, photodiodes, or electrometer circuits.

• Feedback in Oscillator Circuits: In Wien bridge or phase-shift oscillators.

🔧 Usage & Calculations:

• Ohm’s Law (for Safe Operation):

  • Max Continuous Current: Imax=P/R=0.25/220000≈0.00107AImax​=P/R​=0.25/220000​≈0.00107A or 1.07mA.

  • Max Voltage Drop: Vmax=P×R=0.25×220000≈234VVmax​=P×R​=0.25×220000​≈234V.

• Power Dissipation: Typically very low in high-impedance signal applications. Ensure P=V2/RP=V2/R remains below 0.25W.

• High-Voltage Caution: While the calculated max voltage is high, the resistor’s working voltage rating is typically lower (e.g., 250-350V for 1/4W). Verify manufacturer specs for high-voltage use.

• Leakage Current Consideration: At this high resistance, even small leakage currents across the PCB or through the resistor’s body can be significant. Maintain a clean board layout.

⚠️ Important Considerations:

• Voltage Rating Limit: The primary limitation for high-value resistors is often the maximum working voltage, not power. Do not exceed the manufacturer’s rated voltage.

• PCB Contamination: At very high impedances, flux residue, dust, or humidity can create parallel leakage paths, effectively lowering the measured resistance. Clean PCBs thoroughly.

• Precision Handling: For critical applications, handle with care to avoid contamination and measure before use.

• Heat Management: While power dissipation is usually low, avoid placing near heat sources to prevent value drift.