Resistor 0.25W 18 ohm (10 pcs)

The Resistor 0.25W 18 ohm is a quarter-watt through-hole resistor with a resistance of 18 Ω, sold in a pack of 10. This standard E12 value is a good choice for MOSFET gate resistors, current sensing of small loads and LM317 current sources, and it fits breadboards, perfboards and PCBs.

Resistor 0.25W 18 ohm Specifications

• Resistance: 18 Ω (18 ohms)
• Power rating: 0.25 W (1/4 W)
• Value series: standard E12 value (also in the E24 series)
• Colour code: brown, grey, black (4-band) or brown, grey, black, gold (5-band), followed by the tolerance band
• Maximum current: about 118 mA at the full 0.25 W
• Type: fixed resistor, axial leads, through-hole
• Pack size: 10 pieces

Resistor 0.25W 18 ohm Applications

• Gate resistors that slow the edges and limit current into a MOSFET gate
• LM317 constant-current source: 1.25 V / 18 Ω gives about 69 mA
• Current sensing: 50 mA through 18 Ω gives 0.9 V, easy to read with an Arduino analog input
• Emitter resistors in transistor current sources
• Electronics education and prototyping

What's in the Box

• 10 × 18 Ω 0.25 W resistors

Tip: 18 Ω (brown, grey, black) is easy to confuse with 180 Ω (brown, grey, brown), so check the third band or measure it. With 18 Ω, the full 0.25 W is reached at about 2.1 V across the resistor.

Orders placed before 14:00 are ready for pickup the same day. Delivery across Lebanon usually takes 1–3 working days.