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5. Select a Resistor to Drive an LED

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846-ESR03EZPD4700TR-ND
Component
DigiKey Part No846-ESR03EZPD4700TR-ND
Mfr Part NoESR03EZPD4700
ManufacturerRohm Semiconductor

RES 470 OHM 0.5% 1/4W 0603

470 Ohms ±0.5% 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 the calculated value for 22mA through a red LED (12V-2V)/22mA ≈ 455Ω; 470Ω is the standard value and is appropriate.
  • Tolerance: ±0.5% — better than the required ±5%.
  • Power Rating: 0.333W (1/3W) — meets the minimum requirement of ≥0.33W.
       Calculation: Power dissipated = (22mA)^2 x 470Ω ≈ 0.23W, so 0.333W rating provides safe margin.
  • Mounting Type: Surface Mount (0603 package) — matches requirement.
  • Technology: Thick Film — meets the requirement (Thick or Thin Film accepted).
  • RoHS Compliance: Not explicitly stated, but as a recent part from a major vendor, RoHS compliance is likely. For production, confirm with supplier or datasheet.
Conclusion: All key specifications are met or exceeded. This resistor is approved for the application.
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