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5. Select a Resistor to Drive an LED

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ERJ-PA3J471V
Component
DigiKey Part NoP470BZTR-ND
Mfr Part NoERJ-PA3J471V
ManufacturerPanasonic Electronic Components

RES SMD 470 OHM 5% 1/3W 0603

470 Ohms ±5% 0.333W, 1/3W Chip Resistor 0603 (1608 Metric) Automotive AEC-Q200, Pulse Withstanding Thick Film

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EW

Response By EW AI

  • Resistance: 470Ω — Matches calculated requirement for setting ~22mA LED current:
    R = (12V - 2V) / 0.022A ≈ 454.5Ω (standard value 470Ω is ideal).
  • Tolerance: ±5% — Meets or exceeds the required ±5% tolerance.
  • Power Rating: 0.333W (1/3W) — Meets the minimum requirement (≥0.33W).
    Calculated dissipation: P = I^2 × R = (0.022A)^2 × 470Ω ≈ 0.227W — Safe margin.
  • Mounting Type: Surface Mount (0603 package) — Fully compliant with requirement.
  • Technology: Thick Film — Acceptable for LED current limiting, as specified.
  • RoHS Compliance: ROHS3 Compliant — Fully compliant.

Conclusion: All key specifications are met or exceeded.
ERJ-PA3J471V is fully suitable for safely and reliably limiting current to your red LED in this 12V indicator circuit.

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