10pcs 22 ohms 5 band Resistor 1/4w

🔹 10PCS 22 Ohm (22Ω) Metal Film Resistor – 1/4 Watt, 5-Band

High-precision, low-noise metal film resistors with a 22 ohm value and 1% tolerance. Identified by a 5-band color code, these components are essential for precision current limiting, impedance matching, low-value voltage dividers, and snubber circuits where stable and accurate low resistance is critical.

✅ Specifications:

• Resistance: 22 Ohms (22Ω)

• 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: Gold (Multiplier x 0.1)

  • 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 22Ω (range: 21.78Ω to 22.22Ω).

• Low Noise: Metal film construction generates significantly less inherent noise than carbon film, important for sensitive analog circuits.

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

• Clear 5-Band Coding: The extra band and gold 4th band (multiplier of 0.1) allow precise identification of this low value.

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

📦 Typical Applications:

• Precision Current Sensing: As a low-side shunt resistor for accurate current measurement in power supplies or battery monitors (e.g., at 22Ω, 100mV = ~4.55mA).

• Impedance Matching & Termination: For RF or high-speed digital signal lines where a precise low impedance is required.

• LED Current Limiting: For low-voltage/high-current LEDs or when very specific, low current is needed (e.g., with a 3.3V supply and a 3.0V LED: ~13.6mA).

• Snubber Networks: In series with a small capacitor across switch contacts (relays, TRIACs) to suppress voltage spikes.

• Feedback & Gain Setting: In op-amp circuits requiring very low resistance values for specific gain formulas.

• General Low-Value Precision Circuits: Any design where a precise, small resistance is needed.

🔧 Usage & Calculations:

• Ohm’s Law (for Safe Operation):

  • Max Continuous Current: Imax=P/R=0.25/22≈0.107AImax​=P/R​=0.25/22​≈0.107A or 107mA.

  • Max Voltage Drop: Vmax=P×R=0.25×22≈2.35VVmax​=P×R​=0.25×22​≈2.35V.

• Power Dissipation: This is a low-value resistor. Power dissipation P=I2RP=I2R can quickly approach the limit. For example, at 100mA, P=(0.1)2∗22=0.22WP=(0.1)2∗22=0.22W, which is very close to the 0.25W maximum. Derate significantly for reliable operation.

• Current Sensing Example: To measure a 1A current, the power dissipated would be 12∗22=22W12∗22=22W, which is far beyond this resistor’s rating. For high-current sensing, use a milliohm-range shunt resistor.

⚠️ Important Considerations:

• Power Limitation is Critical: The 1/4W rating is easily exceeded with even modest currents due to the low resistance. For any significant current (>~50mA), calculate power carefully and consider using a higher wattage resistor (e.g., 1W, 3W).

• Precision for Low Values: 1% of 22Ω is only 0.22Ω, making these suitable for precise applications.

• Heat Management: Due to the high likelihood of significant power dissipation, ensure excellent ventilation or heatsinking if used near its limits.

• Not for High-Current Shunts: This is not a high-power current shunt resistor. It is for low-current measurement or signal applications.