10pcs 180 ohms 5 band Resistor 1/4w

🔹10PCS 180 Ohm (180Ω) Metal Film Resistor – 1/4 Watt, 5-Band

High-precision, low-noise metal film resistors with a 180 ohm value and 1% tolerance. Identified by a 5-band color code, these components are ideal for precision current limiting, voltage dividers, termination, and feedback circuits where stable and accurate low-value resistance is essential.

✅ Specifications:

• Resistance: 180 Ohms (180Ω)

• 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: Brown (1)

  • 2nd Band: Gray (8)

  • 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 180Ω (range: 178.2Ω to 181.8Ω).

• 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 Current Limiting: For LEDs, laser diodes, or precision voltage references where exact current control is needed. (e.g., for a 5V supply and 2.1V LED: ~16mA).

• Line Termination: As a series termination resistor for digital signal lines (e.g., SPI, UART) to reduce ringing and signal reflections.

• Voltage Dividers: Used with other precision resistors to create specific, accurate voltage ratios.

• Op-amp & Feedback Networks: Setting precise gain, particularly in inverting amplifier configurations.

• Pull-Down Resistors: For switch inputs or open-collector outputs where a precise pull-down value is specified.

• 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=0.25/180≈0.0373AImax​=P/R​=0.25/180​≈0.0373A or 37.3mA.

  • Max Voltage Drop: Vmax=P×R=0.25×180≈6.7VVmax​=P×R​=0.25×180​≈6.7V.

• 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.

• Example – LED Current: For a 3.3V MCU pin driving an LED with Vf=2.0VVf​=2.0V at 10mA:
  R=(3.3V−2.0V)/0.01A=130ΩR=(3.3V−2.0V)/0.01A=130Ω. A 180Ω resistor would provide a safe ~7.2mA.

⚠️ 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 current sources), consider measuring and selecting matched resistors.

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