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5. Select a Resistor to Drive an LED

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JErickson
JErickson
December 3, 2025
13-RC1206JR-7W470RLTR-ND
Component
DigiKey Part No13-RC1206JR-7W470RLTR-ND
Mfr Part NoRC1206JR-7W470RL
ManufacturerYAGEO

RES 470 OHM 5% 1/2W 1206

470 Ohms ±5% 0.5W, 1/2W Chip Resistor 1206 (3216 Metric) Moisture Resistant Thick Film

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EW

Response By EW AI

  • ✅ Resistance: 470Ω matches the calculated value for 22mA with a 12V supply and 2V LED forward drop.
    Calculation: (12V - 2V) / 22mA ≈ 455Ω. 470Ω is the nearest standard value and will yield ~21mA.
  • ✅ Tolerance: ±5% meets the requirement (±5% or better).
  • ✅ Power Rating: 0.5W (1/2W) exceeds the minimum required 0.33W.
    Power dissipated = (22mA)^2 × 470Ω ≈ 0.23W. Margin is excellent for reliability.
  • ✅ Mounting Type: 1206 surface-mount package matches the Surface Mount requirement.
  • ✅ Technology: Thick Film (acceptable per requirement: Thick Film or Thin Film).
  • ✅ RoHS Compliance: ROHS3 Compliant (meets requirement).
Result: All specifications are met or exceeded. This resistor is fully suitable for your LED current-limiting application.
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