20pcs 2.2K OHMS 4 BAND RESISTOR 1/4W 2K2

🔹 20PCS 2.2k Ohm (2.2kΩ / 2K2) Carbon Film Resistor – 1/4 Watt, 4-Band

A highly versatile and commonly used through-hole resistor valued at 2,200 ohms. With its 1/4-watt power rating and standard 4-band coding, this pack is essential for prototyping, circuit building, and repairs. The 2.2kΩ value is a fundamental component in voltage dividers, pull-up networks, and LED current limiting.

✅ Specifications:

• Resistance: 2,200 Ohms (2.2kΩ / 2K2)

• Tolerance: ±5% (Indicated by Gold 4th band)

• Power Rating: 1/4 Watt (0.25W)

• Type: Carbon Film (General Purpose)

• Band Code: 4-Band

  • 1st Band: Red (2)

  • 2nd Band: Red (2)

  • 3rd Band: Red (Multiplier x 100)

  • 4th Band: Gold (±5%)

• Package: Axial Leads

• Lead Spacing: Standard ~10mm (0.4″)

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

• Quantity: 20 pieces

⚙️ Key Features:

• Essential Value: The 2.2kΩ resistor is a standard E-series value found in countless electronic schematics for biasing, current limiting, and signal conditioning.

• Clear Color Coding: Easy-to-read color bands (Red, Red, Red, Gold) for quick identification—often remembered as “Red-Red-Red.”

• Reliable & Economical: Carbon film construction provides stable performance for general-purpose circuits at low cost.

• Standard Power Rating: The ubiquitous 1/4W rating is perfect for the vast majority of low-power signal and control applications.

• Prototyping Ready: Long axial leads are ideal for breadboards, perfboards, and through-hole PCBs.

📦 Typical Applications:

• Pull-Up/Pull-Down Resistors: A classic value for I²C bus lines, button inputs to microcontrollers (Arduino, Raspberry Pi), and general digital logic.

• Voltage Dividers: Frequently used with other resistors (e.g., 10kΩ) to create specific reference voltages or scale sensor outputs.

• LED Current Limiting: For standard 5V circuits with typical LEDs (e.g., (5V – 2.1V) / 2.2kΩ ≈ 1.3mA — produces a safe, dim glow for indicators).

• Transistor Biasing: Setting base current for small-signal transistors (e.g., 2N2222) in amplifier or switch configurations.

• Op-Amp Feedback Networks: Used in gain-setting and feedback loops for operational amplifiers.

• General Circuit Building & Repair: A must-have value for any electronics hobbyist, student, or technician.

🔧 Usage & Calculations:

• Ohm’s Law (for Safe Operation):

  • Max Continuous Current: Imax=P/R=0.25/2200≈0.0107AImax​=P/R​=0.25/2200​≈0.0107A or 10.7mA.

  • Max Voltage Drop: Vmax=P×R=0.25×2200≈23.5VVmax​=P×R​=0.25×2200​≈23.5V.

• Power Dissipation: Always calculate actual power: P=I2RP=I2R or P=V2/RP=V2/R. Keep dissipation well below 0.25W for reliable operation (a good rule is to stay under 0.2W).

• Tolerance Range: With ±5% tolerance, actual resistance will be between 2,090Ω and 2,310Ω.

⚠️ Important Considerations:

• Power Limit: The 1/4W (0.25W) rating is for low-power applications only. Exceeding it will cause overheating, value drift, and eventual failure. For higher power, use 1/2W or 1W resistors.

• Heat: A resistor operating near its maximum rating will be hot to the touch. Provide adequate spacing on your PCB or breadboard.

• Measurement: For circuits where precise value matters (e.g., sensitive voltage dividers), measure with a multimeter due to the 5% tolerance range.