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5. Select a Resistor to Drive an LED

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ShrinikeetRajmane
ShrinikeetRajmane
November 20, 2025
P470ADTR-ND
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 requirement for 22mA through LED (12V supply, 2V LED VF).
  • ✅ Tolerance: ±5% — Meets requirement (±5% or better).
  • ✅ Power Rating: 0.5W (1/2W) — Exceeds minimum requirement (≥0.33W).
    Calculated power dissipation: (10V × 0.022A) = 0.22W, so 0.5W rating provides a robust safety margin.
  • ✅ Mounting: Surface Mount (0805) — Matches requirement.
  • ✅ Technology: Thick Film — Acceptable (meets requirement for Thick or Thin Film).
  • ✅ RoHS: ROHS3 Compliant — Environmentally suitable.
All key specifications are met or exceeded. This is a suitable and reliable choice for your LED current limiting application.
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