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5. Select a Resistor to Drive an LED

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sumitraj10104
sumitraj10104
November 19, 2025
ERJ-P06J471V
Component
DigiKey Part NoP470ADTR-ND
Mfr Part NoERJ-P06J471V
ManufacturerPanasonic Electronic Components

RES SMD 470 OHM 5% 1/2W 0805

470 Ohms ±5% 0.5W, 1/2W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200, Pulse Withstanding Thick Film

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EW

Response By EW AI

  • ✅ Resistance: 470Ω — Matches calculated value for 22mA with 12V supply and 2V LED drop.
  • ✅ Tolerance: ±5% — Meets requirement of ±5% or better.
  • ✅ Power Rating: 0.5W (1/2W) — Exceeds minimum required 0.33W.
    Why it matters: Dissipation is (12V-2V)*22mA ≈ 0.22W, so 0.5W provides a safe margin for reliability.
  • ✅ Mounting Type: Surface Mount (0805) — Matches requirement for SMT.
  • ✅ Technology: Thick Film — Meets criterion of Thick Film or Thin Film.
  • ✅ RoHS Compliance: ROHS3 Compliant — Environmentally compliant as required.
Summary: All required specifications are met or exceeded. This is a suitable, reliable choice for LED current limiting in your application.
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