5. Select a Resistor to Drive an LED

• ✅ Resistance: 470Ω — Matches calculated value for 12V supply, 2V LED, 22mA current.
  Calculation: (12V-2V)/0.022A ≈ 455Ω. 470Ω is the nearest standard value, ensuring safe LED operation.
• ✅ Tolerance: ±5% — Meets requirement for ±5% or better.
• ✅ Power Rating: 0.333W (1/3W) — Meets or exceeds the minimum required of 0.33W.
  Actual dissipation: (0.022A)²×470Ω ≈ 0.23W, so 0.333W provides adequate margin for reliability.
• ✅ Mounting Type: 0805 Surface Mount — Suitable for SMD applications as required.
• ✅ Technology: Thick Film — Acceptable for this application.
• ✅ RoHS Compliance: ROHS3 Compliant — Meets environmental requirements.

Result: All specifications match or exceed the requirements. This resistor (TE Connectivity CRGH0805J470R) is approved for safely limiting current to a red LED in a 12V indicator circuit.