1KΩ 1/4W Carbon Film Resistor ±5% Through Hole Axial Lead Pack

1KΩ 1/4W Carbon Film Resistor – ±5% Through Hole Axial Lead Pack

The 1KΩ (1 kilohm) Carbon Film Resistor is a fundamental component in virtually every electronics circuit. Rated at 1/4W (0.25W) with ±5% tolerance, it is the standard current-limiting resistor for LEDs, base resistor for transistor switching, and a key building block in countless analog and digital designs.

Key Specifications

• Resistance: 1KΩ (1,000 ohms)
• Power Rating: 1/4W (0.25W)
• Tolerance: ±5% (Gold band)
• Type: Carbon Film
• Mounting: Through Hole, Axial Lead
• Temperature Coefficient: ±200 ppm/°C typical
• Operating Temperature: −55°C to +155°C

Compatibility & Use Cases

The 1KΩ resistor is used daily in circuits with Arduino, ESP32, Raspberry Pi, and other microcontrollers. Common applications include:

• LED current-limiting resistor (5V supply with standard LEDs)
• Base resistor for NPN/PNP transistor switching (BC547/BC557)
• Pull-up resistor for open-collector outputs
• Voltage divider networks and signal attenuation
• Buzzer and relay driver circuits

An absolute must-have in any component kit — stock up in bulk for uninterrupted prototyping.

Frequently Asked Questions

Can I use a 1K resistor to drive an LED from 5V?
Yes. One 1K resistor in series with a standard LED on 5V gives roughly 3mA, a comfortable and visible glow. Use a 220Ω resistor if you want maximum brightness.

What are the color bands on a 1K resistor?
Brown, black, red, then gold. Brown (1), black (0), red multiplier (×100) equals 1,000Ω, and gold indicates the ±5% tolerance.

Why is 1K used as a transistor base resistor?
It limits current into the base of transistors like the BC547 to a safe level while still allowing the transistor to switch fully on from a 3.3V or 5V GPIO pin.

Does it work on both 3.3V and 5V boards?
Yes. The resistance value is independent of supply voltage, so this 1K works identically on Arduino (5V) and ESP32 or Raspberry Pi (3.3V) projects.

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