Resistor 0.5W 91 ohm (5 pcs)

The Resistor 0.5W 91 ohm is a through-hole fixed resistor with a resistance of 91 Ω and a power rating of 0.5 W, sold in a pack of 5. This low value is used for limiting LED current from 3.3 V supplies, as a gate resistor for MOSFETs and in current sources, where you need a few tens of milliamps to flow.

Resistor 0.5W 91 ohm Specifications

• Resistance: 91 Ω
• Power rating: 0.5 W (1/2 W)
• Type: fixed resistor, axial leads, through-hole
• Maximum current: about 74 mA at the 0.5 W rating
• Fits: breadboards, perfboards and PCBs
• Pack size: 5 pieces

Resistor 0.5W 91 ohm Applications

• Current limiting for a red LED on 3.3 V: (3.3 V − 2.0 V) / 91 Ω ≈ 14 mA
• Gate resistors for power MOSFETs driven from Arduino or ESP32 pins
• Setting an LM317 constant-current source to about 14 mA (1.25 V / 91 Ω)
• Series resistors on signal and data lines
• Electronics education and prototyping

What's in the Box

• 5 × 91 Ω 0.5 W resistors

Tip: Resistors have no polarity, so they can be fitted either way round. With 91 Ω the 0.5 W limit is reached at about 6.7 V across the resistor: 5 V across it is fine (about 0.27 W), but 12 V across it would need a higher-wattage part.

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